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Sub-woofer wiring advice ?

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo's stylish, distinctive "P2" platform cars.

2001 - 2007 V70
2004 - 2007 V70 R
2001 - 2007 XC-70
2001 - 2009 S60
2003 - 2007 S60 R

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Year and Model: XC70 2004
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Sub-woofer wiring advice ?

Post by Mikele82 » Mon Feb 17, 2020 3:15 pm

trying to "simply" add a subwoofer to my xc70 2004.
so i got a 12inch woofer and enclousure box + amp + hi to low level converter
( https://catalog.pac-audio.com/catalog/a ... cing/lp7-2 )
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was thinking connecting it to the speaker wire = tweeter in the D-piller, just up from the trunk left fuse box.
but now im understanding that this line for The tweeter wires are crossed over too high of a frequency.

so what would be the simplest path to connect the hi-to-low converter for the sub amp with a full spectrum audio/speaker wire ?
would it be routing a speaker wire from rear door speaker ,
is there a simpler path from full spectrum speaker wire to route all the way to the trunk ?

also, is there audio out on this rear fuse box?
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the v70 has a REM diagram for subwoofer, is that somewere on the rear fusebox?
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Re: Sub-woofer wiring advice ?

Post by EngineeringBloke » Thu Jun 25, 2020 4:33 pm

Hi, have you added your sub woofer yet?

While the diagram is for a 2007 model and yours is a 2004, it shows the unit at 16/79 is a subwoofer plus amp module.

That module gets power via 12v from the REM on B-17 and B-18, and ground via 16/79 lines 9 and 10. Those provide the power to run an amp to drive the sub. It looks like the amp is turned on via REM O-7.

The audio signal comes from the rear bass/mid speakers. I do not think there is audio in the REM itself.

Due to the dual 12v and grounds, it appears this is a dual mono (or stereo) sub system - it may have two speakers.

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