I just recently purchased a 2002 civic ex. The rear deck contains 6x9's. Im not too happy with them. Would it be a good idea to replace them with something like 2 8" subwoofers?
Has anyone done this, and was it worth it in your mind?
I was in a similar situation. I had a 4-door Escort, so that is close in size to your Civic. I messed around with all sorts of things for the rear deck, determined to make it work.
I finally ended up with some CDT 6.5" coaxials up front getting 85 watts each. I then had a single ported 8" sub in the trunk. I had that hooked to an electronic x-over with a wired remote up front. I simply removed the rear speakers and let the sub vent into the cabin. For at least 2 years it had all of the sound and bass I needed. In that small car, I just never had a need to upgrade.
I went with coaxials because I wanted minimum install effort on this vehicle. But if you can do components and a 12" sub, go for it. Just make sure that your front speakers can hang with the subs. To make sure that your frontstage can handle sufficient power and can crossover low enough to balance your sub.
Another example: I have a larger sedan. My front speakers are DEI Viper 7" components and a 12" sub in the trunk. Rear speakers removed. I ALMOST spent some money on new rear 6x9's. But now I've decided to spend that money on deadening my doors to remove rattles and I'm going to rebuild my subwoofer box. (The original is too small.)
I'm convinced that this will do more good than buying rear speakers.
I'm not anti-rear fill. I have an suv with comps up front and stock speakers for rear fill and it sounds good to me.
Hope it works out for you.