Question about hand-built preamp and Cambridge CXU/Oppo

[Sig.Rossi]

Hello,

I have a hand-built passive preamp. Photo is attached.

It has 4 alternatively switchable inputs, volume controls and two simultaneously active outputs.

I don't understand the circuit.

I would like to connect two Class D amplifiers to the two outputs at the same time for a double signal from two pairs of speakers.

I tried it. It works. But I'm not sure if that's just luck. Can anyone say whether there is a risk of something being damaged with that circuit?

I also connected the stereo output and the surround front output from a Cambridge CXU to the inputs on 1 and 3. This means I can switch between the pure stereo signal and the processed surround signal. Does anyone know if this can be a problem? The CXU appears to have no output routing.

 

[Sig.Rossi]

Photo attached

 

[Sig.Rossi]

Totally forgot. To make it even more complicated, I would like to route the rear surround output from the CXU directly and the second output from the passive preamp into another switcher and from there into a Class D amp.

I wanted to use something like this

AUDIOPHONICS RCA Input Selector 4 to 1 Reversible - Audiophonics

This Audiophonics RCA source selector lets you connect 4 analog sources to an amplifier, preamplifier or active speakers. Its function is to allow permanent connection between the various devices.

www.audiophonics.fr

or that

Source selector RCA 4 to 1 / reversible - Audiophonics

www.audiophonics.fr

And from the speaker outputs of the amp

something like that to be able to switch from to different pairs of speakers

Selecteur audio 1 to 2 reversible for speaker / amplifier Black S - Audiophonics

www.audiophonics.fr

Pretty complicated. So I thought I'd better ask before burning down the house.

Really hope someone can help.

 

[Sig.Rossi]

CXU stereo - preamp 1 - output 1- Topping PA 5 II

CXU Sr Front -preamp 3- output 1- PA 5 II

CXU Sr Back - RCA Switcher 1- 2nd class D amp

CXU stereo -preamp 1- output 2 - RCA Switcher 2- 2nd class D amp

2nd class D amp speaker out- speaker switch- speaker pair one and two

CXU front out- active speaker

Gee, any problems here ?