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post #1 of 28 Old 04-24-2010, 12:59 PM - Thread Starter
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Decided to start a separate thread on this for more responses. I have a RMX-5050 amp, which has a 119mm x 38mm stock fan that sounds like a hair dryer. Been looking for some low db fans that offer decent cfm.

Digikey has the following:

http://search.digikey.com/scripts/Dk...77173144467594

http://search.digikey.com/scripts/Dk...77169534472380

However, I was wondering if I could downgrade to a 12V fan like this one given for my limited HT use I don't see the sucker getting overly hot...

http://www.tigerdirect.com/applicati...IN#detailspecs

Do I need to mod anything to go with a 12V fan in place of a 24V fan?

Thanks!

 

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post #2 of 28 Old 04-24-2010, 01:11 PM
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Originally Posted by pbc View Post

Decided to start a separate thread on this for more responses. I have a RMX-5050 amp, which has a 119mm x 38mm stock fan that sounds like a hair dryer. Been looking for some low db fans that offer decent cfm.

Digikey has the following:

http://search.digikey.com/scripts/Dk...77173144467594

http://search.digikey.com/scripts/Dk...77169534472380

However, I was wondering if I could downgrade to a 12V fan like this one given for my limited HT use I don't see the sucker getting overly hot...

http://www.tigerdirect.com/applicati...IN#detailspecs

Do I need to mod anything to go with a 12V fan in place of a 24V fan?

Thanks!

Obviously you will have to drop the voltage going to the fan. This can be done with a single resistor-you will have to determine the proper value based on the current draw of the fan you choose.

But this resistor may get hot, so be sure to calculate the proper wattage and possibly a way to cool it. The calculations will determine that.

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post #3 of 28 Old 04-24-2010, 01:14 PM
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Originally Posted by Ivan Beaver View Post

Obviously you will have to drop the voltage going to the fan. This can be done with a single resistor-you will have to determine the proper value based on the current draw of the fan you choose.

But this resistor may get hot, so be sure to calculate the proper wattage and possibly a way to cool it. The calculations will determine that.

Of course another way would be simply drop the voltage going to the current fan-which will slow it down and reduce the noise.

You will have to determine what the minimum voltage is that would guarantee that the fan wold start to turn (it takes more to start it than to maintain it turning), then figure out the current draw at that voltage and figure out the proper resistor value.

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post #4 of 28 Old 04-24-2010, 01:26 PM - Thread Starter
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Sounds complicated! Looking at that 12V SilenX fan. Has a 3 pin connector vs the 2 wire lead that is typical. So not even sure this will work.

All I want is a fan that doesn't sound like a hair dryer. Have never used a resistor or have any clue how to install one or which to install!?

 

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post #5 of 28 Old 04-24-2010, 02:21 PM
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The 3rd wire on the fan is for RPM, so you wouldn't connect it.
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post #6 of 28 Old 04-24-2010, 02:42 PM - Thread Starter
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Oh, figured they would be neutral/power and ground? Oddly enough the 12V fan comes with an adaptor to connect the 3 pinned connection to a 4 female white clip. 1 of the 3 pins coming from the 3 pin connector isn't connected to anything on the 4 female clip, i.e., 2 of the pins go straight into connections (conneting to 2 of the 4 white female thingies) while 1 pin just remains bare. So figure that has to be the ground or the RPM guy.

But guess I'd need some sort of resistor on this fan per Ivan's comment above? The fan is 12V, 90CFM, 0.32 amps, 3.84 watts.

I believe this is the equivalent of the fan I currently have...

http://parts.digikey.com/1/parts/438...w-b30-p00.html

Any ideas what resistor I'd need? Or would it be simpler to just order the first fan in my links above!?

 

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post #7 of 28 Old 04-24-2010, 03:12 PM
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Quote:
Originally Posted by pbc View Post

Sounds complicated! Looking at that 12V SilenX fan. Has a 3 pin connector vs the 2 wire lead that is typical. So not even sure this will work.

All I want is a fan that doesn't sound like a hair dryer. Have never used a resistor or have any clue how to install one or which to install!?

If you plug a 12V fan into a 24V circuit, not only will it probably be louder than your current fan, but it will also become silent pretty quick when it fails

You HAVE to drop the voltage. There are other methods, but a simple resistor would do the trick.

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post #8 of 28 Old 04-24-2010, 03:15 PM
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Just get a 24 volts fan why F@#$ around and mess up something, the first one you linked is only 30 db but not much air flow 68 CFM, my QSC MX3000A has the same dimension fan and i went with this one http://search.digikey.com/scripts/Dk...name=P12860-ND i can not hear it.

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post #9 of 28 Old 04-24-2010, 03:20 PM
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Originally Posted by pbc View Post

Oh, figured they would be neutral/power and ground? Oddly enough the 12V fan comes with an adaptor to connect the 3 pinned connection to a 4 female white clip. 1 of the 3 pins coming from the 3 pin connector isn't connected to anything on the 4 female clip, i.e., 2 of the pins go straight into connections (conneting to 2 of the 4 white female thingies) while 1 pin just remains bare. So figure that has to be the ground or the RPM guy.

But guess I'd need some sort of resistor on this fan per Ivan's comment above? The fan is 12V, 90CFM, 0.32 amps, 3.84 watts.

I believe this is the equivalent of the fan I currently have...

http://parts.digikey.com/1/parts/438...w-b30-p00.html
If indeed the current fan is 24V (I have no idea) then you will need a

Any ideas what resistor I'd need? Or would it be simpler to just order the first fan in my links above!?

You will need a resistor around 37 ohms and preferably 10 watts. The actual power is 3.84watts, but if you use a 5 watt resistor it is going to get REALLY hot.

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post #10 of 28 Old 04-24-2010, 03:26 PM
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Quote:
Originally Posted by kouack View Post

Just get a 24 volts fan why F@#$ around and mess up something, the first one you linked is only 30 db but not much air flow 68 CFM, my QSC MX3000A has the same dimension fan and i went with this one http://search.digikey.com/scripts/Dk...name=P12860-ND i can not hear it.

+1 swap the fan out!!

btw, I have two extra fans (I will have to check if they are the same, I know they are 24V), Im in Mississauga May 3-7th so I can get them to you cheaply!!

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post #11 of 28 Old 04-24-2010, 07:28 PM - Thread Starter
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Originally Posted by kouack View Post

Just get a 24 volts fan why F@#$ around and mess up something, the first one you linked is only 30 db but not much air flow 68 CFM, my QSC MX3000A has the same dimension fan and i went with this one http://search.digikey.com/scripts/Dk...name=P12860-ND i can not hear it.

It's the 46.5db rating that frigthens me on this fan. The one typically used per my initial post is rated at 21db or so (The 80mm fan). So I don't want to order this one only to find it's a tad lower but still quite loud. The QSC is in my Triple 20 Salamander rack which is enclosed with a door, so I'm guessing it is amplifying the noise with the door being closed in the front.

 

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post #12 of 28 Old 04-24-2010, 07:29 PM - Thread Starter
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+1 swap the fan out!!

btw, I have two extra fans (I will have to check if they are the same, I know they are 24V), Im in Mississauga May 3-7th so I can get them to you cheaply!!

Humorous, we're swapping places. I'm in Florida (Coral Gables) for a board meeting May 3 to 7!

 

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post #13 of 28 Old 04-24-2010, 07:35 PM - Thread Starter
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You will need a resistor around 37 ohms and preferably 10 watts. The actual power is 3.84watts, but if you use a 5 watt resistor it is going to get REALLY hot.

Thanks, I assume Radio Shack (or whatever it's called now, Circuit City?) has these. Home Depot has no resistors.

Something like this I assume? Can't

http://www.parts-express.com/pe/show...tnumber=016-33

The other closest option appears to be this ...

http://www.parts-express.com/pe/show...tnumber=016-47

Now if only I can find this locally in Toronto.

 

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post #14 of 28 Old 04-24-2010, 07:48 PM - Thread Starter
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BTW, I assume if I went with a 24v fan like this

http://search.digikey.com/scripts/Dk...77418246359866

(with the Hydro bearings) I won't need any resistor at all? Yes, the CFM is considerably lower (70cfm) than the stock fan, but PM'd Jeff who recently modded his 4050 RMX with a 12V fan and resistor with much less CFM as well and he mentioned it doesn't even get warm with HT, so I'm thinking this may be the best/easiest solution without the need for resistors?

 

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post #15 of 28 Old 04-25-2010, 05:58 AM
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Originally Posted by pbc View Post

Thanks, I assume Radio Shack (or whatever it's called now, Circuit City?) has these. Home Depot has no resistors.

Something like this I assume? Can't

http://www.parts-express.com/pe/show...tnumber=016-33

The other closest option appears to be this ...

http://www.parts-express.com/pe/show...tnumber=016-47

Now if only I can find this locally in Toronto.

Try Mouser Electronics. They have a much wider selection.

The 33 is to low and the 47 is to high. 39 would be a standard value, and I would rather err on the high side of resistance, because a lower value would put a higher voltage on the fan and shorten its life-but it would move more air in the process (and be louder).

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post #16 of 28 Old 04-25-2010, 06:37 AM - Thread Starter
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Didn't realize there were so many different kinds of resistors ... is this what I'm looking for?

http://ca.mouser.com/ProductDetail/V...GHFl1J6w%3d%3d

 

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post #17 of 28 Old 04-25-2010, 06:49 AM - Thread Starter
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Wow, they nail you with a $20 shipping fee, so I'd have to find a local electrical supply outlet to find resistors.

I assume if I install this fan I won't need to mod anything (even though the watts are much lower than the stock fan?)...

http://search.digikey.com/scripts/Dk...77418246359866

 

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post #18 of 28 Old 04-25-2010, 10:45 AM
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Didn't realize there were so many different kinds of resistors ... is this what I'm looking for?

http://ca.mouser.com/ProductDetail/V...GHFl1J6w%3d%3d

That would work

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post #19 of 28 Old 04-25-2010, 11:10 AM - Thread Starter
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Thanks Ivan, been a great help (really know zippo about using resistors). If I wanted to avoid the resistor route altogether, would using the 24v fan I linked above work? I mean, outside of putting out less CFM than the stock fan which I'm not that concerned about, just curious if from a wiring/electrical point of view it I'd have any issues inserting this fan in lieu of the stock fan?

http://search.digikey.com/scripts/Dk...77418246359866

 

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post #20 of 28 Old 04-25-2010, 11:26 AM
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Those 24V Panaflo fans you linked in the first post will work fine without the resistor. People have found that that's quieter than adding a resistor to the stock fan -- probably better blade design. In the part numbers, L, M and H stand for low, medium and high flow. I couldn't link my Digikey search results but here are the 3 that will work.


LL

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post #21 of 28 Old 04-25-2010, 11:56 AM - Thread Starter
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Thanks, going to go with the first one for now (the one I linked) and if the airflow isn't enough to keep the amp cool I'll change later.

 

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post #22 of 28 Old 09-01-2010, 05:45 AM - Thread Starter
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Ivan, I ended up ordering the P9751-ND ...

http://search.digikey.com/scripts/Dk...77418246359866

Still much too loud for my room, so I'm thinking of adding a resistor.

Would this mouser one work on this fan, or would you recco another?

http://ca.mouser.com/ProductDetail/V...GHFl1J6w%3d%3d

Thanks....

 

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post #23 of 28 Old 09-04-2014, 09:54 PM
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Bump.......I know I know its been awhile since someone posted here, but im curious how things worked out. I have 2 RMX 4050hds and they are pretty loud. im looking for a good fan to replace the stock ones. problem is that I have no clue about small electronic stuff, and the one that you said you used, isnt available on digi anymore.

Anyone have any suggestions?

ill be surprised if I hear back from anyone........

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post #24 of 28 Old 09-06-2014, 09:41 AM - Thread Starter
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I believe any of the ones here should work...

http://www.digikey.com/product-searc...=0&pageSize=25

 

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post #25 of 28 Old 09-06-2014, 09:42 AM - Thread Starter
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If you sort by noise, there are a few below 30db. Is your amp in relative open air?

 

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post #26 of 28 Old 09-07-2014, 11:37 AM
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I believe any of the ones here should work...

http://www.digikey.com/product-searc...=0&pageSize=25
On that link there are quite a few fans..........but the quietest one that I can order is 42db, and the stock fan in the 4050 is 42.5db. So not much of a difference there. Most of them have a minimum quantity that must be ordered, and the one that is 28db has a minimum of 25. Ill try to dig around digi to see if I can find something. Im just want to make sure I get a fan that will work, not just one that is quieter. The sock fan has a air flow of 108 cfm, and i'm guessing I can drop that by half? I rarely have a chance to listen at reference so the amp will not be under a lot of load, I don't think heat will be an issue. The amps are in my entertainment center that has about 8" of space in the back and is open in the front.

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post #27 of 28 Old 09-07-2014, 11:43 AM - Thread Starter
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Sorry, didn't realize they were all min quantity of 25! There don't appear to be many 24v fans left for this application.

You could just try to order the resistor that Ivan recommended above?

http://ca.mouser.com/ProductDetail/V...GHFl1J6w%3D%3D

Throw that in-line and see if it reduces the db of the existing fan sufficiently?

 

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post #28 of 28 Old 09-08-2014, 08:27 AM
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Sorry, didn't realize they were all min quantity of 25! There don't appear to be many 24v fans left for this application.

You could just try to order the resistor that Ivan recommended above?

http://ca.mouser.com/ProductDetail/V...GHFl1J6w%3D%3D

Throw that in-line and see if it reduces the db of the existing fan sufficiently?
I went with this...... http://www.amazon.com/gp/aw/d/B00BYT...528360_TE_dp_1

I will be able to adjust the voltage to what ever I want.

I'm don't know if the link will be active, not quite sure how to post a link on the new mobile format.

Edit: looks like it worked.

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