Behringer A500 suggested mods?

[Plermpel]

Hello,

I have 7 Behringer A500s at home driving my home cinema.
I like the sound of them but they get quite noise at high levels.

I allready bypassed the volume knobs and added bigger filter caps.

I've been reading the old A500 modding thread and they talk about other mods like,
replacing the recitfier diodes, does that make sense for me, also thought about increasing the
capacitance of the Buffer caps in the PSU.

Then i have 20 LM4562MA NOPB opamps at home, would they work as a drop in replacement?

Also thinking about replacing the signal passing electrolite capacitors, but foil caps are expensive and huge,
maybe some suggestions here aswell?


Thankfull Greetings,

Plermpel

 

[PRR]

they get quite noise at high levels.

Hiss? Hum? Buzz? Taxi radio? WiFi/CellPhone hash?

 

[Plermpel]

I'd say taxi radio, it's somehow just starting to sound "unclear".
It's clearly audible by playing a sine wave, it's like everything abouth 1kHz the wave get's cut off.

 

[JMFahey]

Please explain how you are measuring that.

everything abouth 1kHz the wave get's cut off

 

[Plermpel]

Sine wave genrator from my DAC to an Amp, and then just by ear, I could hook up osciloscope if you want. But it's more audible listening to music.
I also tried to hook up my fathers Pronomic TL-1200 once and it sounds a lot better at high levels.