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Old 3rd January 2009, 11:02 AM   #1
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Default Electrocompaniet AW-250r Gain

Hi,
Is there a way to reduce the overall gain in the Electrocompaniet AW-250r Power Amp? Internal jumper or something?

My preamp is the ARC Ref3 which has no gain control and on most CD's the system plays to loud even at Volume 1.

Thanks.
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Old 3rd January 2009, 11:27 AM   #2
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Reducing the gain of the AW 250 is not going to be a straightforward or even sensible exercise. The correct place to do this is at the input of the pre or at DAC output.

It's interesting that you have such a high gain. Would you care listing your full system including speakers?
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Old 3rd January 2009, 11:44 AM   #3
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Hi,
Cary SACD 306 Pro
Arc Ref3 Pre
AW-250r Power Amp
Rockport Mira Speakers
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Old 3rd January 2009, 01:40 PM   #4
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At least your speakers are not too sensitive All other components seem to contribute to excessive gain, especially in balanced mode. The Cary is probably the worst offender. It is an obviously bad idea to feed its output into a box with additional gain.

What i would do is modify one of the REF3 AUX inputs with a fixed resistor divider. Not sure about the exact additional attenuation but something in the order of 3:1 or 5:1 seems appropriate to get the ARC attenuators into a more usable range. A series resistor of something like 68-100k and a 20k-40k shunt to ground. Once the optimum values have been established i would get two pairs of nice nude Vishays and solder them between the input jacks and the relay board. If you are reluctant to solder inside the ARC you can probably modify a pair of interconnects with the divider inside the XLRs.
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Old 4th January 2009, 04:45 PM   #5
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Thanks. Will try that.
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Old 4th January 2009, 05:23 PM   #6
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If you decide to get a bit more adventurous it won't be difficult to convert the ARC to just a cathode follower. It shouldn't take more than removing two tubes, lifting one side of a resistor and putting a link inside a tube socket. All entirely reversible and safe. Sound should gain a bit in transparency.
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Old 4th January 2009, 08:05 PM   #7
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Don't think I'm THAT adventurous!
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