Tapping into the factory amp

[justinluv949]

I have a 2011.5 M3 convt, with the
676 Hi-fi sound system
(the car does not have the 752 Enhanced Premium Sound)
I want to add a sub amp to the system. So I need to know what wires from the head unit to the factory amp I need to tap into to get low frequency sub signal, and is it possible to get a remote turn on from the wires going into the factory amp. Pictures would be great but just colors of wires, and info on the wires is good enough for me.
Thank you for all your help.

[Technic]

Originally Posted by justinluv949

I have a 2011.5 M3 convt, with the
676 Hi-fi sound system
(the car does not have the 752 Enhanced Premium Sound)
I want to add a sub amp to the system. So I need to know what wires from the head unit to the factory amp I need to tap into to get low frequency sub signal, and is it possible to get a remote turn on from the wires going into the factory amp. Pictures would be great but just colors of wires, and info on the wires is good enough for me.
Thank you for all your help.

http://www.e90post.com/forums/showthread.php?t=411856

[justinluv949]

Ok I think I got it, but in that post you said,

"You could use either front or rear outputs (they are low level balanced). Do not use any of the high level outputs (woofer/mids).

What amp are you using for this"

I will be using a Zapco 1100.1 with the symbilink connector the SLDIN.BTL-F
High level balanced to Symbilink
That means I can use the high level sub outs or on the diagram,
#3 #4 and #22 #23 to get my signal, And to turn on the amp, I can tap into the #5. Do I have to run a relay or is there enough power to turn on the amp, and the factory amp.
Thank you

[Technic]

Originally Posted by justinluv949

Ok I think I got it, but in that post you said,

"You could use either front or rear outputs (they are low level balanced). Do not use any of the high level outputs (woofer/mids).

What amp are you using for this"

I will be using a Zapco 1100.1 with the symbilink connector the SLDIN.BTL-F
High level balanced to Symbilink
That means I can use the high level sub outs or on the diagram,
#3 #4 and #22 #23 to get my signal, And to turn on the amp, I can tap into the #5. Do I have to run a relay or is there enough power to turn on the amp, and the factory amp.
Thank you

#5 is constant 12V. You need #10 Remote IN (it is remote OUT to aftermarket amps). A relay is recommended for both protection and reliability.

[justinluv949]

Cool Thank You, Last question, If I put in a relay can I use the #5 spot to power the relay or should I run it from the battery.
Thanks

[Technic]

Originally Posted by justinluv949

Cool Thank You, Last question, If I put in a relay can I use the #5 spot to power the relay or should I run it from the battery.
Thanks

I normally use a constant 12V for a relay that is not connected to any device just to make sure that no noise is induced anyhow.

[justinluv949]

I got it. Thank You