Measuring Amplifiers - Page 19 - AVS Forum
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post #541 of 1917 Old 02-06-2008, 09:40 PM
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Quote:
Originally Posted by thylantyr View Post

E.bay has K1 for 'buy it now' $495.

I would expect similar performance to RMX2450.
You might as well just get an EP2500 for $265 - $350
as all three of these amps would be in a similar boat.

If you want to spend $690, look for used amps, CE4000, PLX3402, Crown Xs was
tested well here. This will take you to the next level.

Thanks for the replies guys. I don't want to spend $690, just was wondering if that was a good amp for the money (of course I would try to bargain them down for it).

I already have a RMX2450, so I want to stay with the same setup for my additional drivers that I am adding, but would like more power. I had two EP2500 already that were bad, so I think I'll stay away from those, even though at that price it is tempting.

There is a guy selling the Crown CE2000 for $275 to $325 depending on the age.
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post #542 of 1917 Old 02-07-2008, 07:02 AM
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Quote:
Originally Posted by Danke View Post

Thanks for the replies guys. I don't want to spend $690, just was wondering if that was a good amp for the money (of course I would try to bargain them down for it).

I already have a RMX2450, so I want to stay with the same setup for my additional drivers that I am adding, but would like more power. I had two EP2500 already that were bad, so I think I'll stay away from those, even though at that price it is tempting.

There is a guy selling the Crown CE2000 for $275 to $325 depending on the age.

If memory serves the CE2000s do not have all of the sub friendly feautures of the 4000. So, you might be better served with another amp...

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post #543 of 1917 Old 02-23-2008, 02:33 PM
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Chasw98, you have a PM.
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post #544 of 1917 Old 02-23-2008, 04:29 PM - Thread Starter
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Quote:
Originally Posted by S_rangeBrew View Post

Chasw98, you have a PM.

Now you have one!
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post #545 of 1917 Old 02-24-2008, 11:19 AM
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Hey, Chuck... are you set up to test a four channel amp? I mean all four channels simultaneously. I have a CX404 I could send you. Several of them actually.

Signature Challenged.
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post #546 of 1917 Old 02-25-2008, 06:45 PM
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Quote:
Originally Posted by btp View Post

Hey, Chuck... are you set up to test a four channel amp? I mean all four channels simultaneously. I have a CX404 I could send you. Several of them actually.

Those look killer for rear and side surrounds.Wish I had seen them before I got a apair of Behringer a500's.
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post #547 of 1917 Old 02-25-2008, 09:50 PM
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But not for front mains and center? As the saying goes, you can never have too much power (headroom)... but how much is enough? Hard to answer.

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post #548 of 1917 Old 02-26-2008, 06:04 AM
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Chasw98,
I wonder how the QSC 1450's that I use would stand up.They are run in bridge mode. The (original) Tumult voice coils in series are about 3.6ohms. Since I use four drivers and four amps they really seldom get a real workout.Just curious how the 3.6ohms effects their performance.

KG

PS Your work reminds me of the reviews Ed Mullen did on subs.Very dedicated to results with data.Great work.
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post #549 of 1917 Old 02-26-2008, 12:38 PM - Thread Starter
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Quote:
Originally Posted by btp View Post

Hey, Chuck... are you set up to test a four channel amp? I mean all four channels simultaneously. I have a CX404 I could send you. Several of them actually.


Sorry, I am not setup for 4 channels at once. Possibly in time I could rewire but it would only be for one impedance and that would not be any fun.
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post #550 of 1917 Old 02-26-2008, 12:40 PM - Thread Starter
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Quote:
Originally Posted by kgveteran View Post

Chasw98,
I wonder how the QSC 1450's that I use would stand up.They are run in bridge mode. The (original) Tumult voice coils in series are about 3.6ohms. Since I use four drivers and four amps they really seldom get a real workout.Just curious how the 3.6ohms effects their performance.

KG

PS Your work reminds me of the reviews Ed Mullen did on subs.Very dedicated to results with data.Great work.

kg, you're alive and well! I am pretty sure that the 1450's would at least meet if not exceed manufacturers specifications. Back in the day I was a QSC dealer and they always performed well. After having gotten a PLX 3402 and seeing it perform, they have only improved. 3.6 ohmss won't affect them at all. They will just keep on running.

And thanks for the compliment! I appreciate it.
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post #551 of 1917 Old 02-26-2008, 12:41 PM - Thread Starter
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I should have an Aragon 8008BB for testing in another 2 weeks.
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post #552 of 1917 Old 02-26-2008, 12:50 PM
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Quote:


I should have an Aragon 8008BB for testing in another 2 weeks.




The King of amp ?



fugly & expensive amplifiers


$1800 used with preamp.
http://chicago.craigslist.org/nch/ele/584975283.html



The storm was gone, but dark clouds still hung around
The perfect setting for things to come......

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post #553 of 1917 Old 02-27-2008, 10:12 AM
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Quote:


I wonder how the QSC 1450's that I use would stand up.They are run in bridge mode. The (original) Tumult voice coils in series are about 3.6ohms. Since I use four drivers and four amps they really seldom get a real workout.Just curious how the 3.6ohms effects their performance.


kgveteran
3.6 ohms DCR is at least 4 ohms nominal impedance depending on the driver and how hard it is run. I consider 3.1 ohms DCR to be = to 4 ohm nominal for a driver where it is used within it's linear range.

Dan

Regards,
Dan
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post #554 of 1917 Old 03-04-2008, 06:08 PM
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Someone mentioned they had schematics for the Ep2500

I just picked one up that a local service shop said was unrepairable. for a bad mosfet they missed and several bad emitter resistors. would like a schematic if possible.


Thanks


Zc
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post #555 of 1917 Old 03-26-2008, 11:39 AM
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Did anyone ever test the eD LT/1300?

It is not "open-minded" to reject knowledge - Bob Lee
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post #556 of 1917 Old 03-26-2008, 12:38 PM
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Quote:
Originally Posted by penngray View Post

Did anyone ever test the eD LT/1300?

/guessing

800w @ 4 ohms @ 1% thd @ 110VAC, @ 20hz continous sine wave test.



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post #557 of 1917 Old 03-26-2008, 07:45 PM
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thylantyr,

Just a quick and easy one,for you.

Strictly for sub woofer duty to drive Acoupower/LMS-Ultra drivers in a sealed cabinet, what would you recommend?

Price being a very secondary consideration.

No need for any on board crossover or any EQ.

How do you feel about very high damping factor numbers posted by ..for example Crown with the iTech series?

Is the extra damping in your view worth the extra expense?

Thank you

Ask yourself mortal , do you have as much displacement as me ? The answer is no unless you have a Windmere fan sub.
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post #558 of 1917 Old 03-27-2008, 09:53 AM
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thylantyr,

A big thanks for the detailed info in the PM.

Ask yourself mortal , do you have as much displacement as me ? The answer is no unless you have a Windmere fan sub.
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post #559 of 1917 Old 03-27-2008, 02:28 PM
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Over 3600lbs of subwoofers

A Behringer is just not enough ...........



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post #560 of 1917 Old 04-04-2008, 08:47 PM
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RMX2450 vs XTI2000, the price is similar so which one is the better choice? RMX2450 has 2400W @ 4 ohms bridged, XTI2000 has 2000W @ 4 ohms bridged as per specs.

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post #561 of 1917 Old 04-05-2008, 05:43 AM
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Did anyone try the new QSC GX 5 series with sub output? would make a good 2-channel setup.
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post #562 of 1917 Old 04-08-2008, 05:55 AM
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Quote:
Originally Posted by Richard Mayer View Post

Quote:
Originally Posted by graigsub View Post

Originally Posted by craigsub
The question is ... will it really DO that power ? Does anyone know of a single amp that can deliver 2500 Watts x 2 channels into a 2 ohm load ?

Ok ... That's asking a lot ... the XTi-4000, rated at 1600 watts x 2 @ 2 ohms looks like a natural for the dual SDX-15 project.

Yes, the Crown I-Tech 6000 or 8000.

http://www.crownaudio.com/amp_htm/itech.htm

Also the QSC PL380.

http://www.qscaudio.com/products/amp...owerlight3.htm

Ok, it's an old quote, but face audio F1700DS digital amp can deliver(at least in specs) 2x 3100w @ 2ohm. No bridged mode though, but who needs it when you can drive dual 4ohm coil sub in paraller.

Any thoughts on F1700DS?
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post #563 of 1917 Old 04-08-2008, 11:13 PM
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Sorry if this might be off topic. I have a pair of Infinity floorstanding speakers. I want to change the look of the speaker a bit by changing the feet they stand on. Where can I find a nice set of speaker feet?
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post #564 of 1917 Old 04-09-2008, 01:44 PM
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Quote:
Originally Posted by bori View Post

Sorry if this might be off topic. I have a pair of Infinity floorstanding speakers. I want to change the look of the speaker a bit by changing the feet they stand on. Where can I find a nice set of speaker feet?

Ummmmmm...Check out PartsExpress.
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post #565 of 1917 Old 04-15-2008, 01:03 PM
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Quote:
Originally Posted by chasw98 View Post

Here are some more numbers on the Buttkicker amplifier. I have included 2 pictures of the test rig so that you can see what I am doing and what the waveform looks like. This amp was designed for tactile transducers and performs that job very well. But if you will notice the Yellow Fluke voltmeter in the picture, it is reading the input voltage to try and get this amplifier to do what it says on the box. The front end of this amp is awful. If the input signal is too high, the waveform is distorted before you have even amplified it to send the signal to the speakers. When sending the signal to transducers, waveform does not matter!

This picture is showing the input voltage at over 7 volts and the distortion is at 14%.


This picture shows the frequency (49 Hz), distortion (13.7), waveform (top trace) and distortion (bottom trace), and input voltage (7.24 VAC).


And here is chart with readings as much as I could get from the amp at 4 & 2 ohms. I had to use 125 VAC to drive the amp just to get the maximum wattage.


Chuck

Hey Chuck, since I already have one that came as part of the kit, it looks like I could realistically expect maybe 500 relatively clean watts into 4 ohms (from the first graph)? And WRT to the front end, I typically have my AVR's sub-out set very low and the amp's gain high to compensate. Would this help the bad front end, or is the problem after the amp's volume control?

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post #566 of 1917 Old 04-15-2008, 01:45 PM - Thread Starter
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Quote:
Originally Posted by Jack Gilvey View Post

Hey Chuck, since I already have one that came as part of the kit, it looks like I could realistically expect maybe 500 relatively clean watts into 4 ohms (from the first graph)? And WRT to the front end, I typically have my AVR's sub-out set very low and the amp's gain high to compensate. Would this help the bad front end, or is the problem after the amp's volume control?


Jack:
You would be realistically expecting what the Buttkicker amp could produce. When I tested the amp people were looking at it as a cheap 1,000 watt amplifier and it is not. But when used without that expectation, it will perform just fine. With your AVR's sub out set at less than o db, I don't think you will hear any distortion or breakup at that level.

Chuck
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post #567 of 1917 Old 04-15-2008, 02:31 PM
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Wait so it IS possible to make one of those motor amps to sound good?
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post #568 of 1917 Old 04-15-2008, 02:34 PM
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Originally Posted by AlexE View Post

Wait so it IS possible to make one of those motor amps to sound good?

Sure it will sound good but will it perform well at high wattage.... Not so much. There are cheaper alternatives that perform better.
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post #569 of 1917 Old 04-15-2008, 03:14 PM
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Quote:
Originally Posted by chasw98 View Post

Jack:
You would be realistically expecting what the Buttkicker amp could produce. When I tested the amp people were looking at it as a cheap 1,000 watt amplifier and it is not. But when used without that expectation, it will perform just fine.
Chuck

Ok, makes sense. I haven't needed more power than that, I guess, as it's been fine for my subs. For ~$100, I'll take it. If I need another 3-6dB, I'll move on up.

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post #570 of 1917 Old 04-15-2008, 03:16 PM
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Quote:
Sure it will sound good but will it perform well at high wattage....

Nahh. If it were advertised as a 500w sub amp and $100 cheaper, perhaps it'd be competitive.

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