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Old 09-08-2013, 04:57 PM - Thread Starter
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I am including this avs link to avoid repetition. http://www.avsforum.com/t/1464723/cv-2800.

This amplifier is basically one of many names of amplifiers with the same internals. The Samson SX 3200 has a few extra output transisitors or 12 per channel

I already use the Cerwin vega CV 2800 and have been very pleased with the results. Same amplifier with 10 output transisitors per channel.

On the amplifer board itself it will indicate, "v" . "CV", HP , etc, indicating the same board is used in many amplifiers.

I could not resist buying 4 of these do to price. All four brand new for 1800.00

The fans can be rewired in series to the fan output on one amplifier board, to quiet down and slow down the fans. They will run at half voltage.

Once again I will be hooking up lights to the front of the amp. I have removed the front sponges and replaced with Metal grates. So lighting can be used.

Very good amps for subwoofer, I recommend one sub per amp bridged.

Heres a pic of the SX 3200 with modified front grills.

A Good amplifier requires a adequate power supply, It does not matter what the amplifier is capable of if the power supply will not provide the power required. Most amplifiers have under rated power supplies. It is up to you to make sure you get the ones that are
least under rated if at all.
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Old 09-08-2013, 08:31 PM - Thread Starter
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Here is a close up shot of the Samson SX 3200 amplifier board. Here is where you can clearly see, different amplifiers labeled. The main label states SX 2800, the remaining abbreviations show other amplifiers.

A Good amplifier requires a adequate power supply, It does not matter what the amplifier is capable of if the power supply will not provide the power required. Most amplifiers have under rated power supplies. It is up to you to make sure you get the ones that are
least under rated if at all.
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Old 09-08-2013, 08:36 PM - Thread Starter
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Here is a the freshest shot you will see, of the whole internals of the Samson SX. 3200. Interestingly enough, even though my amplifiers were very close in sequential serial numbers. Some had Black covers over the toroid, and this one had a silver cover.

A Good amplifier requires a adequate power supply, It does not matter what the amplifier is capable of if the power supply will not provide the power required. Most amplifiers have under rated power supplies. It is up to you to make sure you get the ones that are
least under rated if at all.
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Old 09-08-2013, 08:50 PM - Thread Starter
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Here is a closeup of the labeling of the Power supply PCB. They use the same one in all the amplifiers shown in the link on post #1. It would seem that all these different marketed Name Brands, are eager to put their name brands on these complete amplifiers. Most who do not search very deep simply think they are buying a name brands proprietary manufacturing, however it is just a high quality standard amplifier board and power supply, that all these name brands are adopting.

No doubt one of the many reasons, economies of scale have been achieved in the production of all these name brand amplifiers, as with all using the same boards and power supplies, Production and final costs, will be much lower than proprietary brands.

A Good amplifier requires a adequate power supply, It does not matter what the amplifier is capable of if the power supply will not provide the power required. Most amplifiers have under rated power supplies. It is up to you to make sure you get the ones that are
least under rated if at all.
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Old 09-08-2013, 09:03 PM - Thread Starter
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It should be noted the samson sx 3200 , has no subsonic filter set, has no limiter set, and does not have front panel metering, as the CV 2800 , and b52 US 4000 have. There is also only one combo xlr trs input, and no link inputs. However if you find a dead amplifier of another brand using these boards they can easily be added at a pretty cheap cost. A pretty dumb move not to include the link jacks, or at least could have supplied separate trs and xlr inputs, so one could be used as a link. Not too much bother to me however as I do not really require the links now, but have found them convenient in the past.

The only other amplifier with the 12 per channel like this amplifier is the B52 US 4000. For 649.00 each. A large premium over the samson. If you value the missing features, get the Cerwin Vega cv 2800 and go with 2 output transistors per channel less.

This concludes my update on the Samson SX 3200. I hope some find the info useful in making a decision on amplifier purchasing.

A Good amplifier requires a adequate power supply, It does not matter what the amplifier is capable of if the power supply will not provide the power required. Most amplifiers have under rated power supplies. It is up to you to make sure you get the ones that are
least under rated if at all.
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Old 09-09-2013, 07:26 PM - Thread Starter
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http://db.audioasylum.com/mhtml/m.html?forum=amp&n=114415&highlight=samson+servo&r=&search_url=%2Fcgi%2Fsearch.mpl%3Fsearchtext%3Dsamson%2Bservo%26b%3DAND%26forum%3DALL%26topic%3D%26author%3D%26date1%3D%26date2%3D%26slowmessage%3D%26ip%3D%26sort%3Ddate%26sortOrder%3DDESC

Here is an excellent link, where a krell owner and also a levinson owner compare the Pro Samson SX 3200 As an equal alternative.

A Good amplifier requires a adequate power supply, It does not matter what the amplifier is capable of if the power supply will not provide the power required. Most amplifiers have under rated power supplies. It is up to you to make sure you get the ones that are
least under rated if at all.
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Old 09-09-2013, 07:36 PM
 
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I have an SX3200 as one of my sub amps. Good amp all around.
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Old 09-10-2013, 12:56 AM - Thread Starter
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I agree A9X. Here I am showing the simple fan modification to make it quiet for home stereo use. Step one is to frey and cut the fan wires.

A Good amplifier requires a adequate power supply, It does not matter what the amplifier is capable of if the power supply will not provide the power required. Most amplifiers have under rated power supplies. It is up to you to make sure you get the ones that are
least under rated if at all.
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Old 09-10-2013, 01:00 AM - Thread Starter
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Both fans will be connected to the one fan plug shown above. You do this by wiring in series. Here is the other side showing the cut, You no longer use this fan plug, but you can use it for auxiliary lighting as I do if you wish.

A Good amplifier requires a adequate power supply, It does not matter what the amplifier is capable of if the power supply will not provide the power required. Most amplifiers have under rated power supplies. It is up to you to make sure you get the ones that are
least under rated if at all.
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Old 09-10-2013, 01:03 AM - Thread Starter
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Now you get some spare wire, Here I just used blue marked speaker wire, which works just fine. Cut a piece long enough to reach each fan. Then connect the negative lead of one fan on the right, to the positive lead of the fan on the left , then tape, or solder and tape.

A Good amplifier requires a adequate power supply, It does not matter what the amplifier is capable of if the power supply will not provide the power required. Most amplifiers have under rated power supplies. It is up to you to make sure you get the ones that are
least under rated if at all.

Last edited by johnplayerson; 02-19-2016 at 06:14 PM.
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Old 09-10-2013, 01:10 AM - Thread Starter
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Now you connect the positive lead of the right hand fan to the near by plug, no need for extra wire. Now you cut another piece of wire to run from the negative lead of the left fan to the negative power of the fan plug. All show in this picture. Just unplug the unused wires for the other fan or tape them up and your done. Once you turn on the amp, the fans will run at half voltage from one 24volt dc power supply, and be very quiet.
I did this to all my cerwin vega cv 2800 amplifiers and they have been going six years now no problems.

A Good amplifier requires a adequate power supply, It does not matter what the amplifier is capable of if the power supply will not provide the power required. Most amplifiers have under rated power supplies. It is up to you to make sure you get the ones that are
least under rated if at all.
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Old 09-10-2013, 05:53 PM
 
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Quote:
Originally Posted by johnplayerson View Post

I agree A9X. Here I am showing the simple fan modification to make it quiet for home stereo use.
I don't recall mine being loud. It's not in use at the moment as I'm waiting for my other pair of FTW21 to turn up and to reallocate the amps for that. My system has a 12V auxiliary rail in the rack to power other items and power the fans in my very noisy Quest amps from that and will do the same for the Samson if it proves annoying. Fans will be on whenever the amp is on. The fans I have in that are 80mm Noctuas.
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Old 09-25-2013, 04:51 PM - Thread Starter
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The fans are fairly quiet for pro amplifiers, but they are still a distraction for home audio use if left as original

http://www.design-mate.com/

Here is the company that is licencing its amplifiers to all these other brands. Samson, cerwin vega, b52, american audio, audiophony, and the list goes on!!.

I wonder if samson and cerwin etc will adopt their lightweight amplifiers? , they look pretty impressive.

A Good amplifier requires a adequate power supply, It does not matter what the amplifier is capable of if the power supply will not provide the power required. Most amplifiers have under rated power supplies. It is up to you to make sure you get the ones that are
least under rated if at all.
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Old 09-26-2013, 01:03 AM
 
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Ive had three samson sx 3200 amps. They have great sound quality in my opinion and provide plenty of power. I think alot of people overlook these amps because of the brand name which is a shame. They really are great amps.
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Old 09-27-2013, 10:01 AM
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Originally Posted by Swolephile View Post

Ive had three samson sx 3200 amps. They have great sound quality in my opinion and provide plenty of power. I think alot of people overlook these amps because of the brand name which is a shame. They really are great amps.

I'll be using three of the sx1200's for an active set of LCR's. They will be running mid's and high's. These 3200's look pretty beefy.
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Old 09-28-2013, 04:02 AM - Thread Starter
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I agree with you. A lot of people get tied up in a name brand too much in my opinion. I'm not saying this is necessarily bad, just that it leads to willingful blindness when it comes to giving respect for others designs.
I have some Yamaha, Klipsch, and rockford gear, that is all top of the line name brand, and do like them. However it is also my opinion in the amplifier world that quality has started to become easy to provide for
any brand name, as technology eventually comes full circle, with all amplifiers, both high and low end now adopting the same design and similiar quality.

Todays high power amps still use the same RCA amplifier technology introduced in 1954. The only difference is we have figured out how to increase the power substantially, and add a few design improvements to lower THD. Most people who owned amps like Krell etc, would be willingfully blind to the fact these are good, just to protect their own name brand, Not that they own the name brand, just that they feel insulted, having someone say an amplifier 1/4 the price is as good as theirs is, and will not accept or admit it.

In the Pro world Some Amplifiers may be way better for road travel etc , adding to the cost, but for home audio, Road worthiness is not even a factor.

If you look at what Emotiva is doing, they are providing some really good home audio amps at good prices, and if you look inside them they are using the same output devices that american audio is using
in the VLP series amplifiers. One begins to wonder what a direct comparison of a XPR amplifer to a VLP 2500 would reveal. as th vlp would be half the price of emotiva.

A Good amplifier requires a adequate power supply, It does not matter what the amplifier is capable of if the power supply will not provide the power required. Most amplifiers have under rated power supplies. It is up to you to make sure you get the ones that are
least under rated if at all.
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Old 09-28-2013, 06:15 PM
 
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Yep people sometimes rely on brand names too much. I can firmly say the Samson Sx 3200 and Yamaha Ps7000 are the best sounding pro amps ive heard under $1000.
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Old 10-23-2013, 06:02 PM - Thread Starter
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Three sx 1200s will be six channels at quite a bit of power lol. Here is one of the samson sx 3200 complete with all the modifications. 1. fans rewired in series to whisper quiet. 2. installation of dc step down converter and front lighting. 3. Removal of front sponges and replaced with black mesh grate. ( I really do not like the look of those sponges lol).

A Good amplifier requires a adequate power supply, It does not matter what the amplifier is capable of if the power supply will not provide the power required. Most amplifiers have under rated power supplies. It is up to you to make sure you get the ones that are
least under rated if at all.
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Old 11-19-2013, 05:16 AM - Thread Starter
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Here is the original HPA A3200. The Samson SX 3200 rebranded. The B52 US 4000 rebranded etc. Note how much bigger the toroidal looks without a
Cap installed.

A Good amplifier requires a adequate power supply, It does not matter what the amplifier is capable of if the power supply will not provide the power required. Most amplifiers have under rated power supplies. It is up to you to make sure you get the ones that are
least under rated if at all.
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Old 12-08-2013, 11:07 AM - Thread Starter
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I was rewiring the lights for my cerwin vega 2800 amplifiers, so i took advantage of the fact they are open to take a pic with a measuring tape. As you can see the toroidal transformers in these amps are almost 7 INCHES WIDE. You get a much larger toroid in these top of line HPA amplifiers than most other name brand amplifiers.

A Good amplifier requires a adequate power supply, It does not matter what the amplifier is capable of if the power supply will not provide the power required. Most amplifiers have under rated power supplies. It is up to you to make sure you get the ones that are
least under rated if at all.
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Old 09-02-2014, 01:53 AM - Thread Starter
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http://www.design-mate.com/

thought i would add the Hpa link here also

A Good amplifier requires a adequate power supply, It does not matter what the amplifier is capable of if the power supply will not provide the power required. Most amplifiers have under rated power supplies. It is up to you to make sure you get the ones that are
least under rated if at all.
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Old 11-01-2015, 11:39 AM
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Quote:
Originally Posted by johnplayerson View Post
Three sx 1200s will be six channels at quite a bit of power lol. Here is one of the samson sx 3200 complete with all the modifications. 1. fans rewired in series to whisper quiet. 2. installation of dc step down converter and front lighting. 3. Removal of front sponges and replaced with black mesh grate. ( I really do not like the look of those sponges lol). <a class="H-lightbox-open" href="http://www.avsforum.com/content/type/61/id/298309/"><img alt="" class="lightbox-enabled" data-id="298309" data-type="61" src="http://www.avsforum.com/content/type/61/id/298309/width/350/height/700/flags/LL" style="; width: 350px; height: 263px"></a>
I recently picked up a Samson SX 3200 to replace the Samson SX1000 that SVS supplied with my twin SVS Ultra subs a decade or so ago. I stumbled across this thread and performed the fan mod according to your wonderfully detailed instructions. And as advertised it worked out great. So thank you, I wouldn't have had the courage to attempt this without your guidance.

You know, a guy could get into this HT thing and drop a couple of bucks!
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Old 11-01-2015, 11:39 AM
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Originally Posted by johnplayerson View Post
Three sx 1200s will be six channels at quite a bit of power lol. Here is one of the samson sx 3200 complete with all the modifications. 1. fans rewired in series to whisper quiet. 2. installation of dc step down converter and front lighting. 3. Removal of front sponges and replaced with black mesh grate. ( I really do not like the look of those sponges lol). <a class="H-lightbox-open" href="http://www.avsforum.com/content/type/61/id/298309/"><img alt="" class="lightbox-enabled" data-id="298309" data-type="61" src="http://www.avsforum.com/content/type/61/id/298309/width/350/height/700/flags/LL" style="; width: 350px; height: 263px"></a>
I recently picked up a Samson SX 3200 to replace the Samson SX1000 that SVS supplied with my twin SVS Ultra subs a decade or so ago. I stumbled across this thread and performed the fan mod according to your wonderfully detailed instructions. And as advertised it worked out great. So thank you, I wouldn't have had the courage to attempt this without your guidance.

You know, a guy could get into this HT thing and drop a couple of bucks!
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Old 11-03-2015, 12:50 AM - Thread Starter
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Originally Posted by dgolombowski View Post
I recently picked up a Samson SX 3200 to replace the Samson SX1000 that SVS supplied with my twin SVS Ultra subs a decade or so ago. I stumbled across this thread and performed the fan mod according to your wonderfully detailed instructions. And as advertised it worked out great. So thank you, I wouldn't have had the courage to attempt this without your guidance.
Your Welcome. The simple rewiring in series is really a breeze. The 3200 is an excellent amplifier as you will soon find out. Just love these HPA.

Funny thing is, many of my very simple shares on AVS about these amplifiers, have been taken word for word almost, and shared on other sites by people who seem to want to make out that they are really smart with some original idea of their own, and state the same idea, without bothering to provide a link to the original author. Lots of these can be found on Av forums, rather than AVS forum. Some were almost word for word LOL.

Does not bother me too much. I have 24 hrs a day to fool around with ideas, where others have busy lives and less time. This is why I make these simple shares.

Some ideas I have been forced to monetize. Especially where amplifier recapping is concerned of vintage equipment. Many do not have the time for simple things like figuring out how to order capacitors at an online parts venue. With so many requests for Cap kits, I had to start selling them.

A Good amplifier requires a adequate power supply, It does not matter what the amplifier is capable of if the power supply will not provide the power required. Most amplifiers have under rated power supplies. It is up to you to make sure you get the ones that are
least under rated if at all.
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Old 11-18-2015, 05:50 PM
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Your Welcome. The simple rewiring in series is really a breeze. The 3200 is an excellent amplifier as you will soon find out. Just love these HPA.

Funny thing is, many of my very simple shares on AVS about these amplifiers, have been taken word for word almost, and shared on other sites by people who seem to want to make out that they are really smart with some original idea of their own, and state the same idea, without bothering to provide a link to the original author. Lots of these can be found on Av forums, rather than AVS forum. Some were almost word for word LOL.

Does not bother me too much. I have 24 hrs a day to fool around with ideas, where others have busy lives and less time. This is why I make these simple shares.

Some ideas I have been forced to monetize. Especially where amplifier recapping is concerned of vintage equipment. Many do not have the time for simple things like figuring out how to order capacitors at an online parts venue. With so many requests for Cap kits, I had to start selling them.
Just a follow-up to our discussion. I performed the fan mod and the amp kept going into protect mode. I returned the fans to original configuration and it now performs fine and does not go into protect mode. My amps are rack mounted in a cabinet with 9 fans running in the other room. I have temp display and the cabinet really gets above 80 degrees. So the fan mode may not work in a stacked rack.

You know, a guy could get into this HT thing and drop a couple of bucks!
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Old 11-18-2015, 06:16 PM
 
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I'd be looking at the cooling airflow in and out of the rack space. With nearly 20kW of amplification in my rack, it seldom gets above 20C, but if it does, the (large external) ingress and egress fans ramp up to ensure adequate airflow and bring it down quickly.

Inside the amp where it's detecting the temperature for the fan it will be many degrees higher.

Middle Atlantic have an excellent paper on rack cooling.
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Old 11-19-2015, 04:55 AM - Thread Starter
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Just a follow-up to our discussion. I performed the fan mod and the amp kept going into protect mode. I returned the fans to original configuration and it now performs fine and does not go into protect mode. My amps are rack mounted in a cabinet with 9 fans running in the other room. I have temp display and the cabinet really gets above 80 degrees. So the fan mode may not work in a stacked rack.
Well I have a total of 7 of them running, all stacked up on top of each other, and all the fans wired in series, and they have been running no problems for over 8 years now. Some are 8 years old and some are just a few years old. They may as well be in rack too, as they are all in a wood cabinet with enclosed back, with two inch space on each side.

You are the first to ever have a problem wiring your fans in series, on these units. I would almost think you just came by to play games or throw out a total BS story, just to be a XXXX. Would not surprise me with people I have seen coming to say anything, just to be a XXXx and try and defame what is simply an effort to provide helpful posts. But I will give you the benefit of the doubt

So what is causing your protect mode problem? Are you running the units into two ohms loads and driving them all day like pro audio? If so then you should not be modifying the fans in the first place as the fans being quiet would not be an issue then. If your Temperature protection is coming on, then your amplifiers are overheating. I have not managed to overheat any amplifier even after a two hour listening session. On most two hour sessions i have, the temperature in the house will be 74 degrees, and will rise to 78 after with all 12 pro amps running along with two consumer amps.

You certainly must have some kind of one in million situation that your amplifiers are overheating, and causing temperature protection to kick in. Obviously you need more air flow for the circumstances in which you are using the amplifiers. (BEST FORGET ABOUT TAKING THE RACK HANDLES OFF LIKE YOU WERE PLANNING SO YOU COULD ENCLOSE THE AMPS FURTHER BY PUTTING THEM BEHIND A CLOSED CABINET!!!) In ANY case if you need the fans to be quieter, but they do not run fast enough when wired in series, you can Try spending five dollars and putting some Lm2596s on each fan. I went that route with one of my Cerwin vega cv 5000s. The fans on those will not run at all in series. Replacing with lower power consumption fans or Lm2596s worked in well in those cases.

Note that the fans are suppose to be two speed with a higher speed kicking in after a certain temperature.
I have never seen this higher speed. Have you seen your fans work in BOTH SPEED'S before your temp protection kicked in?
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A Good amplifier requires a adequate power supply, It does not matter what the amplifier is capable of if the power supply will not provide the power required. Most amplifiers have under rated power supplies. It is up to you to make sure you get the ones that are
least under rated if at all.

Last edited by johnplayerson; 11-19-2015 at 05:13 AM.
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Old 11-19-2015, 07:39 AM
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Quote:
Originally Posted by johnplayerson View Post
Well I have a total of 7 of them running, all stacked up on top of each other, and all the fans wired in series, and they have been running no problems for over 8 years now. Some are 8 years old and some are just a few years old. They may as well be in rack too, as they are all in a wood cabinet with enclosed back, with two inch space on each side.

You are the first to ever have a problem wiring your fans in series, on these units. I would almost think you just came by to play games or throw out a total BS story, just to be a XXXX. Would not surprise me with people I have seen coming to say anything, just to be a XXXx and try and defame what is simply an effort to provide helpful posts. But I will give you the benefit of the doubt

So what is causing your protect mode problem? Are you running the units into two ohms loads and driving them all day like pro audio? If so then you should not be modifying the fans in the first place as the fans being quiet would not be an issue then. If your Temperature protection is coming on, then your amplifiers are overheating. I have not managed to overheat any amplifier even after a two hour listening session. On most two hour sessions i have, the temperature in the house will be 74 degrees, and will rise to 78 after with all 12 pro amps running along with two consumer amps.

You certainly must have some kind of one in million situation that your amplifiers are overheating, and causing temperature protection to kick in. Obviously you need more air flow for the circumstances in which you are using the amplifiers. (BEST FORGET ABOUT TAKING THE RACK HANDLES OFF LIKE YOU WERE PLANNING SO YOU COULD ENCLOSE THE AMPS FURTHER BY PUTTING THEM BEHIND A CLOSED CABINET!!!) In ANY case if you need the fans to be quieter, but they do not run fast enough when wired in series, you can Try spending five dollars and putting some Lm2596s on each fan. I went that route with one of my Cerwin vega cv 5000s. The fans on those will not run at all in series. Replacing with lower power consumption fans or Lm2596s worked in well in those cases.

Note that the fans are suppose to be two speed with a higher speed kicking in after a certain temperature.
I have never seen this higher speed. Have you seen your fans work in BOTH SPEED'S before your temp protection kicked in?
I don't understand the attitude. I have previously complimented you on this modification as well as your detailed instructions. The mod performed as advertised and I was grateful for your help. Unfortunately in my case it I apparently needed the full speed of the fan to keep the internals cooled. (I also have twin fans running directly below the SX3200 in a Middle Atlantic mount) I did extensive testing before going back to the OEM configuration. My setup may be unique (6 ft. tall completely enclosed rack with a glass door in the home theater side. The cabinet extends into an adjacent utility room. The cabinet is 30" deep and has two fans on each side and a three fan panel on the top of the cabinet.) but you cannot dispute the fact that returning the fans to full speed cured my issue. I am using this amp of drive a pair of SVS PC-Ultra subs.

You seem to have taken my input personally and you should not. In most scenarios your mod will likely work great but it did not work for me. After all the whole idea of this forum is to share our experiences.

You know, a guy could get into this HT thing and drop a couple of bucks!

Last edited by dgolombowski; 11-19-2015 at 08:03 AM.
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Old 11-19-2015, 08:34 PM - Thread Starter
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Quote:
Originally Posted by dgolombowski View Post
I don't understand the attitude. I have previously complimented you on this modification as well as your detailed instructions. The mod performed as advertised and I was grateful for your help. Unfortunately in my case it I apparently needed the full speed of the fan to keep the internals cooled. (I also have twin fans running directly below the SX3200 in a Middle Atlantic mount) I did extensive testing before going back to the OEM configuration. My setup may be unique (6 ft. tall completely enclosed rack with a glass door in the home theater side. The cabinet extends into an adjacent utility room. The cabinet is 30" deep and has two fans on each side and a three fan panel on the top of the cabinet.) but you cannot dispute the fact that returning the fans to full speed cured my issue. I am using this amp of drive a pair of SVS PC-Ultra subs.

You seem to have taken my input personally and you should not. In most scenarios your mod will likely work great but it did not work for me. After all the whole idea of this forum is to share our experiences.

There is not issue, Try concentrating on the message I gave you. My post simply says that you must have created a situation which for whatever reason compromises air flow by being in a very enclosed situation. Series wiring is not your problem, inadequate air flow is.

You never answered both my questions on the ohm loads you are driving. If one is driving two ohm loads or four ohm loads stereo, obviously your amps will generate more heat. So my second message was also part of the conditions you put your amplifiers in, which is requiring full blown fan operation, in your case
The amps are two speed fans (according to the manual), and I have never seen the second speed. Seeing as you managed to go to temperature protection for some reason, I was curious to see if yours went into the second speed.

Other interesting info would be how long it took for you amps to go into temp protection under the conditions you are currently using. As i show, my amplifiers are somewhat closed in, as the cabinets are closed back. The air gets pulled out the back of the amplifier and then gets pushed back to the front via hitting the back of the cabinet and then flowing out the two inch spaces on each side to the front. This in itself is an airflow restriction on my part that has no effect on adequate air flow in my case.

Note the SAmson version of the HPA amplifiers have very thick fan filter at the front. I have removed those filters. They are very restrictive of air flow. I replaced mine with regular punched hole grates, to match the rest of my system. So if airflow is an issue at slower fan speeds you may wish to to without the filter.

The fans in the samson are Jamicon 24 volt as in all HPA series amplifiers. When you turn the amplifiers on with the fans in series each fan will get 7 volts of power. With the fans at normal SPEED 1, the fans will get 14 volts each, not 24, with the fans wired normally. They are hooked up to a 24 volt power supply, so I imagine the other 10 volts kicks in at the SECOND speed, that I have never seen!!!. HAVE YOU!?

As I have further advised, the LM2596 method can reduce voltage to the fans, and the speed can be adjusted more. So if the fans are too noisy for you, (note the fans on these units are on the quiet side of pro amps to begin with), you can try the LM2596 method. That method will allow full adjustment of each fan
from zero to 14 full volts at the start speed. In series you are fixed at 7 volts per fan. The Lm2596 will let you go to 9 10 11 12 13 volts, Allowing a more relaxed fan speed reduction, if your situation requires it. Obviously it does.

The cerwin vega cv 2800 units which are the same as the samson part for part, have no restrictive filters in front. The simple removal of the filter changes air flow considerably, but not if you manage to get your rack handles off, and shut the front door while your amps are running LOL. I guess when you series wired your fans you forgot to check to see if the handles came off easy on the inside, hence you asked me if I knew.

All my amplifiers are 8 ohm stereo loaded, or 4 ohm stereo loaded via Bridge Mode. So in my favor of course is very easy amplifier loading as 8 ohm bridge loading,(4 ohm stereo equivalent), is actually less taxing on the amplifiers as you get 3 to 4 times power at half the rail voltages. All my amps run in 8 ohm stereo and 8 ohm bridge.

With all the 2 ohm loaders on AVS. I am surprised many more do not blow there amps, especially after reducing air flow. Lots of behringer ep 2500 and 4000s blown, and I see people modding the fans and 4 ohm bridge loading like crazy. ( I imagine most are not running here to tell everyone thier amp blew!!.

A Good amplifier requires a adequate power supply, It does not matter what the amplifier is capable of if the power supply will not provide the power required. Most amplifiers have under rated power supplies. It is up to you to make sure you get the ones that are
least under rated if at all.

Last edited by johnplayerson; 11-19-2015 at 08:54 PM.
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Old 11-20-2015, 07:42 AM
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The SVS subs are 8 ohm and I am running the amp in stereo mode. In the end having the glass door keeps the sound level down in the HT room. The fan noise is not an issue when the door is closed. The thermocouple in the cabinet indicates that heat is not an issue so I'm happy with the setup the way it is.

Thanks for your input.

You know, a guy could get into this HT thing and drop a couple of bucks!

Last edited by dgolombowski; 11-20-2015 at 02:45 PM.
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Cerwin Vega Cv 2800 High Performance Power Amplifier , Samson Audio
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