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Revision as of 22:51, 22 June 2014 by Grinnders (talk | contribs)
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So quite a few people have installed a powered subwoofer so I'm not claiming to be the first, it's just there's no wiki article.

I've previously had a MY2006 (non-airbag dash) and that had a subwoofer fitted under the dash in the pax footwell. It seems the facelift dash (I have a MY2010 Exige) won't easily support something suspended from beneath the pax airbag so the logical decision was to place it behind the foot rest.

I had some help from pinkie and litton4 regarding their installs which helped me on my way but I don't think either of them put their subwoofers themselves so they provided a bit of observation and heresay from their installs.

I have experience of a previous installation in a Cayman of a Kenwood KSC-SW01, but choose a KSC-SW11 for this installation for 3 reasons. 1. the KSC-SW01 has a more limited remote control. This is not a problem if you have a multi-functional head unit that supports all the config for a subwoofer in the software (for the Cayman I had a Double DIN touch screen Kenwood DNX model) 2. the size difference is actually fractional. 3. The KSC-SW11 is a symmetrical design and so anticipating its location I thought it may look aesthetically more OEM.

KenwoodSW11.jpg Image
Kenwood KSC-SW11.

The wiring for both Kenwoods is identical, and I planned to used phono leads to connect to the head unit.

SW11Wiring.jpg Wiring Diagram
Kenwood KSC-SW11.

I have a fairly basic Alpine CDE-9872RM

CDE9872RM.jpg Image
Alpine CDE-9872RM

So consulting the wiring diagram there are basically 5 connections to consider.

+ve Power

Litton4 had suggested to me that he believed the power for his subwoofer had come from the jump start posts under the inspection hatch. After a quick reccie I found the fuse box and obviously plenty of cables leaving that area and heading into the cabin. Having a look under the pax footwell I spotted a bundle of cables heading out through a grommet just underneath where I imagined the fuse box to be... so i small incision into the grommet and a poke of a graphite rod (technical version of a coat hanger) I found it appearing underneath the fuse box. This confirmed I had a run for +ve and earth. SO starting from the outside in (yellow power cable for the sub has a separate 10amp fuse near the O ring connector I duck taped the other end to my rod and retrieved it into the cabin. (easier to remove the fuse box to get access and be careful not to lose the nylon washers underneath) Ok so 1 cable down.


So the +ve cable separates from the block/plug thing with m/f bullet conectors. The earth however is two cables into one and is connected to a block that accommodates the other connectors and won't practically squeeze through a grommet. The +ve is such a long cable you can easily attach the earth to it (more duck tape) and then retrieve it by pulling the yellow power cable from the outside. Bingo. 2 cables done.

Rsz img 1506.jpg Image
+ve and earth connected to jump start posts

I had to swing the +ve cable around so I could put the red insulation cover back on.. (I also dropped the original nut somewhere onto the floor pan. Doh!)

=Internal cables

So the next connundrum is how to connect the Phono and blue/white 'trigger' cable to the head unit.

Phonocables.jpg Image
2m phono cables

This was much trial and error and after a failed attempt trying to poke them up through another grommet I discovered there's a track that runs along the top oddments tray and below the airbag part of the dash

Clearly you will need to extract the head unit at some point. Now is a good time as I found I also needed to remove the cage. This is beacuse there is a recess underneath the cage on either side that will enable you to gets the cables discreetly to the back to the unit.