My DIY PowerAmp

drummerjohn

drummerjohn

Joined
Sep 13, 2009
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Southampton UK
Hi, I'm new and feeling a bit out of my depth after looking at all the fantastic systems on here.

Anyhoo... I'm doing stuff on the cheap as it were.

I got the hankering to get into listening to quality stereo again. I have had Denon & Sony AV AMPs but never been that happy with the stereo sound quality.

I use a PC to output the sound using ASIO as I have about 100GB of music in FLAC\WAV\MP3 format.

Saw two BK Power Amps - OMP300 barebones on Ebay - £140. Bought them and mounted them onto a chassis and made a temporary backplate.

It feeds my Monitor Audio BR5s. What a difference! Music is handled with pure ease and openness.

Specs of each amp are:
R.M.S. Watts into 4 Ohms 310W
R.M.S. Watts into 8 Ohms 220W
3dB Power Bandwidth 1Hz - 100Khz(STD)
Damping Factor >300
Slew Rate 60/uS
Full Power t.h.d. 0.0035%
T.h.d. Typical 0.0008%
Input Sensitivity 500mV(STD)
Input Impedance 10K Ohms
S/N Ratio 110dB
Weight 4.8Kg
Size - Depth 330 x 175 x 102mm

P1000545.JPG


And yes that's twin & earth for speaker cable.
 
They take me back,had a load of BK modules ( 2.5kw worth) about 20 years ago,they took all sorts of abuse,even when some idiot managed to get the outputs and inputs round the wrong way frying the output stage of the mixing desk ,shorted speaker outputs and being plugged into dodgey electricity ,they just carried on working,biggest hassle was the on board fuses ,soon cured that with panel mounted fuses..
 
It looks a home made bomb ;(

Love the twin power supplies I cannot imagine what that would sound like with rock and dance. It looks like boith channels are completly equal so I bet there is a very nice soundstage there too.

What are you using as a pre amp?
 
My PC has an Maudio Revolution sound card - using that.

Looking to buy a dedicated DAC like a Beresford or Cambridge Audio. Any opinions on that?
 

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