Stock Head Unit - Aftermarket Amp connectivity (RCA)

[PhilUK]

Can anyone advise on how to connect an aftermarket amp to a stock Business head unit?

I have an amp lying around but it only has RCA inputs.  :blink:

[Raj]

Something like this:

high to low converter

[Steamyrotter]

Done this on mine.

Used a similar convertor to that posted
Run RCA to boot.
Note you may pick up noise from the IBus & other equipment up front depending on position and connection...

There are a few little things to note...
The Amp On/Off signal wire stays on If you turn the ignition on.... So amps stay powered up
My way round this was i made an IBus module to detect the Radio On/Off button press then trigger a relay to operate the Amps.

The other thing to note is that if you have Phone prep etc they usually send this to the Front Outputs.  Wonder how i know that!!!??
You could also have a problem with this not turning the amp on if you use it....
Way round that - fit a bypass relay to the Speaker outputs so that when the amp is off the speakers are re-connected to the head unit, amp on then speakers connected to amp.  Simples..