Home theater bypass


Hi I am am new member I need some help with routing for my home theatre. I have a Onkyo 7.2 receiver and a mac275 amp with a cj pre amp. My speakers are Maggie's which I use for both systems I'm plugging and unplugging every time I want to use one or the other. How can I wire up a permanent setup to avoid this. Any suggestions would be great!
audiomaze
I have a Mac C48 preamp that only goes into bypass mode by a 12v trigger from a processor. I have been working around this as my Oppo 105 that I use as a processor has no 12v trigger.

Another idea would be to get one of those 12V wall wart DC power adapters, chop the end and solder it into a 1/8" male mono plug. Use that as the 12V trigger for C48 and then just plug it in when you want to trigger the C48 into bypass mode.
Same idea with some refinement :
Use a 12V wall wart DC power adapters with inline on/off switch and a 3.5mm Male to 5.5x2.1mm Female DC Adapter.
https://www.amazon.com/Gxilee-100-240V-Converter-Household-Electronics/dp/B01FXF6AEQ
https://www.ebay.com/itm/3-5mm-Male-to-5-5x2-1mm-Female-DC-Adapter-Converter-Jack-Power-Plug-CCTV-DV...
Turn on the inline switch if you want bypass.
So now I am about to set up my new 205 which has a trigger to put the C48 in bypass, but what if I just want to play a CD and not HT, how do i control that, if every time I turn on the 205, the C48 goes into bypass.
https://www.amazon.com/RDL-ST-ACR2-Line-Level-Audio-Controlled/dp/B01D96JVFG
Connect the RDL input to center channel or LFE output of 205, connect the RDL relay switch between 205 trigger output and C48 trigger input.
The HT bypass will be done automatically.
@audiomaze -- what input on the CJ are the audio outs from the DVD player connected to?