Replacing Power supply Electrolytic Caps in Beolab Penta II

Slight humming noise can be heard from my Penta's II as the volume is turned all the way up with no input signal. I never listen to any music at maximum levels anyway, but It just bothers me that the noise is still present there somewhere. Even if its inaudible at lower volume levels

Perhaps I'm over reacting a bit. Just wanted to improve the situation as much as possible. 

I'm using A/V 7000 as a preamp for all active speakers.

My first thought was too much a/c ripple is present on dc supply rail in Penta Amplifiers...

and to replace electrolytic caps for Hi and Low voltages...

Second thought is to replace coupling capacitors in signal path of the Panta Amplifiers

and the third is to replace op amps in A/V 7000 receiver.

Wondering if shielded Power Link cables can improve the situation a bit since my Computer Router is near by...

any suggestions would be greatly appreciated 

Thank you guys in advance.

B&O for Life...

First, remember the Penta speakers always work at “full volume”. Your source device (A/V 7000) is what sets the volume. So if you have noise only when you increase your volume, the issue is not the Pentas, but upstream. Make sure you have quality powerlink cables before changing anything in the A/V 7000.