I doubt the RVX will "digitalize", and rather pre-amplify directly what will come through line-level inputs (I was talking of taking the RCA outputs from the DACIt to RCA inputs of the RVX - such as the "CD analog input" -). It's however true that you'll then get through the RVX preamp stage, which is not that great compared to the Decco2 one.
But going the other route, as far as I know, will cause you additional issues.
Think is you will have to control the volume level.
So when connecting the Sonos to the Decco2, then the Decco2 to your MA power blocks, the volume will be controlled by the Decco2, right?
But when connecting the RVX to the Decco2 (to get the left/right channels and route it to the MA power blocks), then the Decco2 volume knob will also control the volume for left / right.
You see the trouble here: you will have to change the volume for HiFi / HomeTheater on the Decco2.
This is due to the absence of the "Home Theater Bypass" on the Decco2, contrary to the Nova (as an example).
The idea of a "switch" for the L/F loudpseakers is not great, for two reasons:
- even high-end switches are not really transparent (they will add noise, reduce dynamics, and create in some cases impedance issues)
- when switching (except for digital switches, which are very hard to find) there will be some loopback current going from one amp to the other one, and this is very bad (and there could even be some loopback current if switching while the two amps are off)
Now if you'd find a solution for a HT Bypass equipped PeachTree integrated amp, you'd still have the subwoofer question.
I suppose you want to use the subwoofer both for HiFi and HT uses.
For the best HT experience, the sub has to be connected to the .1 output, to benefit from the dedicated sub tracks from movies.
You could for sure connect it to the PeachTree integrated, but then you'd loose this track, and only get the sub parts of the Left / Right channels.
To connect the subwoofer to the PeachTree outputs, you should not use Y cables with the goal of "splitting" the signal from the preamp outputs to the sub and to the power blocks. Simply because Y cables are passive, and do not control how much signal is send to each output, and do not forbid loopback signals between the two outputs.
I don't know your subwoofer model, but in many cases there is a "loudspeaker level" input. Such input is used to place the subwoofer between the poweramps and the L/R speakers, so in your case between your MA blocks and your L/R loudpspeakers.
My advice for you would be the following:
- keep the sub connected to your RVX
- keep the MA blocks connected to your RVX
- plug the Sonos to a nice PeachTree DAC
- plug this DAC to your RVX
You'll loose a better preamp stage, but you have a great amp stage, you'll get a phenomenal DAC stage (and believe me, the Sonos internal DAC cannot have any word compared to a PeachTree DAC), you'll not change your HT sound (which should be great) ... and you'll not have a user-non-friendly setup to switch from HiFi to HT listening.
It was only my 2 cents.