Y connector to amp create mono signal?

[corcraft 10+ year member]

Hey guys, Excuse my ignorance if this is a no brainer but after reading some posts it made me question myself. This is what I am or was planning on doing. I want to keep my factory radio and add a 6 channel oem interface processor. I am planning on 3 of the same 2 channel amps for the entire system, 1 stereo for front stage 1 mono for sub and the other one is where I was trying to be creative and my question comes into play. I wanted to use 1 channel for my front center channel coming out of the processor and the other channel I wanted to connect my rear parallel for rear fill and to do this I was simply going to use a y connector coming out from the 2 rear channels out of the processor to get 1 "mono" signal. The reason that I question myself is because from the posts that I have read on using "mono" rear fill have said that the only way to accomplish this is to bridge your amp and if you couldn't do that then you would have to find a processor that would run mono rear. Again, I'm sorry if this is a dumb question but using a y adapter to get a mono signal to my amp is what I had planned for rear fill until i read those posts.

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[keep_hope_alive Premium Member]

i understand exactly what you want to do and why you want to do it. you can't do what you want as described. you can split a signal with a Y-adapter, but you can't combine them passively with a y-adapter. you want a separate active component for creating a mono signal. you could just use some great audio op-amps with high slew rates (I like Analog Devices) and 1% resistors to make your own. it would be similar to building an unbalanced to balanced converter, something i've done with great success in the past.

the circuit is fairly simple, the power supply is the most complicated part as you want/need a +15VDC/-15VDC supply that is fully regulated and filtered.

Jensen transformers has a "passive" transformer-based device that does what you want for balanced signals:

http://www.jensen-transformers.com/as/as080.pdf

You could easily convert the output to balanced then use this circuit or modify this to work with unbalanced signals.

Unbalanced polarity converter for an A minus B addition before the combination to mono for L-R rear fill (reference to your other thread):

http://www.jensen-transformers.com/as/as042.pdf