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Old 29th April 2005, 02:01 PM   #1
Sony is offline Sony  Europe
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Default How to improve a DENON POA-2800?

I "feel" this powerful three stage amplifier can be optimized, but where should I start? Changing some capacitors for higher specs ou better quality? Mess with bias? ...

Power and frequency response are excelent, but I would like to make the sound get closer to the performance of a Pass Labs amplifier.

By the way, does any one have the schematic of this amp?
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Old 30th April 2005, 03:47 AM   #2
anatech is offline anatech  Canada
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Hi Sony,

This is a tightly engineered amp. It will never sound like a Pass because the circuits are fundamentally different. There is not a whole lot you can do except maybe match the transistors (minor improvement). Most new amps don't lend themselves to improving that much.

Yes you can replace caps, install a magic power cord and replace the feet with whatever someone believes sounds the best. If you replace all the resistors with metal film you will likely "write it off". Don't mess with the bias too much on this.

It's not a bad amp at all. It is unlikely that you can change the sound enough if you don't like it. It is designed to work the way it's built. They are reliable.

-Chris
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Old 2nd May 2005, 12:08 PM   #3
Sony is offline Sony  Europe
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Chris, thanks!

So, I understand radical results can only been obtained changing the topology of the amplifier, and that cannot be done with this amplifier.

Do you know where can I find a description of this "Optical Class A"?

Sony
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Old 3rd May 2005, 01:57 AM   #4
anatech is offline anatech  Canada
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Hi Sony,
This amp uses an optocoupler to vary the bias. Not really a big deal but it sounds good on the sales floor.
I repaired these under warranty. They sound okay.

-Chris
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Old 8th May 2005, 11:07 AM   #5
Sony is offline Sony  Europe
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I will start by the risked and expensive step of replacing the original source capacitors (4x 18.000F 85V) by fresh new 4x 33.000uF 100V.
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