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AppleBonker »
https://forums.nicoclub.com/applebonker-u101518.html
Tue Sep 28, 2010 1:20 pm
The 8120 is a good unit. Seems like a reasonable price too. It should work fine on the stock speakers, as long as you don't crank the volume too much (the stock speakers likely can't handle the power from the Kenwood head unit at full tilt). Personally, I like the Alpine units better (but that's totally just my preference). You may want to check with Broadfield (username of a member here) to see what he has and what the price is.
As far as the subs go, two subs will obviously be louder than one. The larger the sub you get, the deeper it should hit, but it will be less clean. The trunk of the coupe is difficult to squeeze subs into, and two (plus the amp/s) will consume basically the entire trunk.
You're second option is interesting. First, you don't need speakers in the rear. Everything you listen to basically is two channel, so you don't need more than that to reproduce it (again, this is an opinion - but pretty much any audiophile will agree, lose the rears). What you are referring to is called running the subwoofers IB (infinite baffle). This has been done, and with success, in many cases. However, it is important to select the proper subwoofers to be able to handle that type of application. Most subwoofers are designed for install in enclosures, and the lack of pressure generated from IB installs makes them perform poorly. Also, this would likely limit you to 8" woofers and even that would probably require cutting metal from the rear deck. It would be a more challenging install, but would save a decent chunk of trunk space.
When you get closer to buying subs, give us an idea of budget and we can be more helpful in guiding you in the direction of a few models to investigate.