+1 on monobloc amp with low pass filter

In what way?

Its currently getting 2 of the 4 channels from the amp and the other 2 channels go to the front splits, the deck powers the rear speakers....I think thats how its setup..

The amp output of 4 x 90w rms is at 2 ohms I think?

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K.E.R.S!!!1

Not necessarily. What's the power rating of the Sub?

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Signarape!

its strange u got an average job done at Alberts. They did my car and it is a preemo job!
They fitted 2 x 12inch alpine subs in a box, secured it well, alpine mono block under seat and top of range alpine deck and its sounds bombed! The install is as good as the equipment fitted!
How long ago did u get your system fitted? have u told them about your problems? most workshops will repair any unsatisfactory work if u notify them within 3 months or so. Try get them to fix any dramas before u fork out any cash

Sorry to job block ya bumpstop, just my 2c

Lifetime Warranty on ALL alberts work.

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97 WRX V3 STi with goodies.

No probs mate.

And as Philbo stated -

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www.facebook.com/technikcaraudio
www.cardomain.com/id/boostndb

thnx for the pm back bump, ill give u a call in a few weeks with more details when im ready :-)