DIY 98 to 2001 GS 300/400 Subwoofer Upgrade

[Boosted27606]

In case somebody is interested I like to share that modification. It made a HUGE difference.

The stock stereo in my GS300 was fine as far as clarity of the mid and high parts of the music spectrum. The bass, however, was weak.

I just finished replacing the 10" subwoofer located on the rear deck with a new one and I added a separate amp to power it.

Now I can shake the mirror and feel the "thumps" in the seat !

I bought a KICKER Comp 07C104 10 Inch sub. the reason I picked that one if because it works well in free air ( the trunk ) as opposed to being in a small enclosure. The Amp I bought is the : Profile HA700M 350 watts at 2 Ohms.

I am sure there are other models that will fit as well

The trick is to install the sub. You have to remove the rear seats to get to it. It is not difficult if you know how .........

First, sit in the back seat and grab the front of the seat from underneath, lift until it pops out and remove the seat bottom.

Now you see 7 bolts that hold the vertical back seat. Some are 12 mm others are 14 mm. Unscrew them all. Remove the head rests. Now lift the leather flaps under the headrests and unscrew the two 12 mm screws there. Move the vertical seat forward ( keep seat belts attached to the deck.at the top ).

Now you can lift the rear deck and unscrew the existing sub.

To install the new one ( with different bolt pattern ) you might have to use some plywood to trace the pattern of new sub and securely bolt it on said plywood. Use some foam gasket material between sub and wood to eliminate vibrations. Now check out the screw pattern in the deck and use the same bolts to install your plywood with new sub on it into existing spot. Again, use foam gasket material to dampen potential vibrations.

This was the hard part.

Proceed with re-intalling the seats and you are done for the sub install.

The amp. is in my trunk and I use the existing 2 wires from the Lexus stereo to power the HI input of the Amp. Every other connection is standard:

12 Volt from battery ( fused)

12 V (ignition Only )

Ground

2 wires to Hi Input

2 wires to the new sub.

Adjust cross over frequency to fit your style and VOILA !!

Enjoy window rattling bass that can potentially frighten women and small children

If you have any question, send me an IM I will be glad to help