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Class D Switching Power Amplifiers and Power D/A conversion

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Old 20th August 2008, 11:48 AM   #1
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Default H class amp sounding "boxy"

So, with gigs approaching and one of my old MOSFET amps (K135/J50) experienceing an embarrassing failure, I spent the money for reliability on a PV2600 H class amp. At 500W per channel.

The thing is:- at living room volumes, the Peavey sounds thin by comparrason. Is that a feature of Class H? Would it tend to fatten up as the power increases? My MOSFET sounds correct compared to my Headphones.

I cant do a real check until I get an "excuse". Even soaking up 12db with my L-pad leaves a lot of headroom. Since My guitarist just broke his wrist, I won't have an excuse for a couple of months.
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Old 21st August 2008, 07:32 AM   #2
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Maybe it is a general probelm of Peavey amps due to not very generous PSU dimensioning.

I remeber that we compared a Peavey CS 800 to the first generation of the Mosfet 1000 a quarter of a century ago. And the Mosfet 1000 was definitely better regarding low-end punch and control.

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Old 21st August 2008, 10:08 AM   #3
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Hi Charles,
I don't think that peavey suffers from under-side power supplies. This happens at LOW volume. Since my post I ran a test with a 12db L-pad. It sounds better. Maybe it needs to "lean into the wind" a bit before it settles down. I don't know why this would be so.
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