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<blockquote data-quote="PSturmer" data-source="post: 8120311" data-attributes="member: 568966">yeah you can do it. when i would compete i would disconnect my door speakers from my HU with the flip of a switch. what you wanna do is only one step further. by using relays you can have your door speakers connected to your factory HU as long as your second HU is powered off. then once your second HU powers on the amp turn on lead (the blue wire coming from the second HU) can be used to power a system of relays that first breaks the connection between your factory HU and door speakers and completes a new circuit between your second HU and door speakers. you could use relays like this:<a href="http://www.parts-express.com/pe/showdetl.cfm?partnumber=330-073" target="_blank">12 VDC Automotive 5-Pin Relay SPDT 30/40A Bosch Type 330-073</a>each door speaker will require i believe 4 of these.... so with four speakers a total of 16. then to power all of these relays i wouldn&#039;t use the second HU as a power source, but rather use another relay. so a total of 17 relays. PM me if you would like specific help with the wiring diagram.</blockquote>

[QUOTE="PSturmer, post: 8120311, member: 568966"] yeah you can do it. when i would compete i would disconnect my door speakers from my HU with the flip of a switch. what you wanna do is only one step further. by using relays you can have your door speakers connected to your factory HU as long as your second HU is powered off. then once your second HU powers on the amp turn on lead (the blue wire coming from the second HU) can be used to power a system of relays that first breaks the connection between your factory HU and door speakers and completes a new circuit between your second HU and door speakers. you could use relays like this: [URL="http://www.parts-express.com/pe/showdetl.cfm?partnumber=330-073"]12 VDC Automotive 5-Pin Relay SPDT 30/40A Bosch Type 330-073[/URL] each door speaker will require i believe 4 of these.... so with four speakers a total of 16. then to power all of these relays i wouldn't use the second HU as a power source, but rather use another relay. so a total of 17 relays. PM me if you would like specific help with the wiring diagram. [/QUOTE]

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