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Message: <blockquote data-quote="keep_hope_alive" data-source="post: 8205325" data-attributes="member: 576029">i've done this before on a boat.  we wanted the owner to run off the head unit for low power listening but then be able to engage an external amp for high power listening.there are two ways to do this.  the cheap way is with a collection of DPDT toggle switches.  they will have On-Off-On configuration so you can select source 1 (head unit) or source 2 (amp).  one for each speaker +  remote.  cheap but effective and also allows selection of which speakers to keep on (for the boat this worked well).the better solution is to use 5-pin relays.  the N.C. position will be the head unit source.  the N.O. position will be the amp.  one master toggle switch will control power for the amp remote turn-on and the relay coils.  you will need two relays per speaker.</blockquote>

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