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Jury rigging a WiFi controlled speaker selector

My home stereo set up is an NAD c 375bee (150w) and I run three pairs of speakers (hardwired throughout the condo).

My ADCOM GFS-3 speaker selector is cutting out on the left channel intermittently (unusual no?) Anyway, as I seek to replace it, I'm wondering how hard it would be to create a WiFi controlled (or even IR controlled) speaker selector using a product like this (thanks to user @imhififan for recommending it on a different thread.)
https://www.amazon.com/MHCOZY-Channel-Control-Appliance-Compatible/dp/B07MXCWRGX?ref_=ast_bbp_dp&th=1&psc=1

Actually, that switch is meant for power appliances so I need to find the equivalent specs for speakers don't I? But assuming I can find that, would it be ill advised to use just ONE switch for each PAIR of speakers by running only the + or - from each pair through it? I just need to off/on the circuit right? 

If I situate the WiFi switch behind the ADCOM GFS-3 and before each speaker pair then it seems like I could get double duty out of a single switch, or am I missing something? Besides slight cost saving it's the clutter of six switches and the fact that I don't want to have to switchon/off each left and right speaker separately that appeals.

For context: Only one company makes an integrated IR remote speaker selector, the OSD ATM-7 which only handles 100wps and costs a fortune.

Thanks for your insights and suggestions!


pilastr
Post removed 
pilastr OP
2 posts
 
@noromance That unit looks easier, but it says 8 channel. is that enough for three speaker pairs? I need to solicit help from a soldering-capable friend and read up on relays. Thanks for the suggestions all! 

One thing confuses me,  Is sound not degraded running through these selector units? Those connectors all look way too small to handle 14 gauge. I currently use tinned braided monster cable. I'm probably missing something again? Thanks for suffering the newbie questions!
imhififan's avatar
imhififan
2,204 posts
 
@noromance That unit looks easier, but it says 8 channel. is that enough for three speaker pairs?
Since noromance did not respond to your question, maybe I can give you some suggestions.
If you don’t mind using a remote control instead of WiFi, and switching left and right channel separately, here is the wiring diagram (second photo of my system page):
https://ucarecdn.audiogon.com/a5cd4597-d2ed-40d9-8778-1e5d5082566b/-/autorotate/yes/
 Since the speakers negative terminal are tied together, 6 relay channel is enough for 3 speaker pairs, the down side is it’s not advisable to use as a amplifier switcher( I think you won’t mind anyway).
The diagram only show one channel, the other channel should wired the same. Please note that ONLY one pair of speaker will be powered even ALL speakers are turn on, this is to prevent overloading the amplifier.
Those connectors all look way too small to handle 14 gauge. I currently use tinned braided monster cable.
I suggest use 16 or 18 gauge solid cable connect the relay to speaker binding post instead of stranded cable to avoid short circuit!
Is sound not degraded running through these selector units?
I don’t think this relay base selector degrade sound quality more than the ADCOM GFS-3, and because such a small length of wire, you don’t have to worry using 16/18 gauge connecting the relay to binding post. BTW, just imagine how thick is the speaker driver voice coil wire?


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