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subs for car?

Sealed boxes offer more than enough sound, imo...

I see lots of guys running two JL 12w7's in a large ported box and, at that point they aren't really listening to music, they are looking for people to turn their heads.

my local audio guy suggest MTX with sealed box and I installed it yesterday. but it's still not very tight. compare to other guys 12" it's very tight sound but I still think has to be
softer and tighter. is there anyway to change it tighter?
should I change the sub unit again?
 
You probly just arent used to all that bass in your music. Just turn it down some and see how that works. Does the amp have a high-pass feature like I mentioned earlier?

Yes, work with the knobs on the amp... you will also get used to the bass, like I told you... what you want, isn't easily or cheaply done.

You can get close by turning everything down but, I don't think its going to do what you want.
 
my local audio guy suggest MTX with sealed box and I installed it yesterday. but it's still not very tight. compare to other guys 12" it's very tight sound but I still think has to be
softer and tighter. is there anyway to change it tighter?
should I change the sub unit again?

What size is the box and which MTX driver is it? Is the box very specifically designed for that sub?
 
Have a link? I can't find anything on them in google.

I can't possibly see what g-force could offer over a well designed and executed DIY box. I suppose some people want the convenience of just picking up a box, but a calculator and a few basic woodworking tools are all you need to build an excellent enclosure.

Besides, the sub driver has a lot more than "almost nothing" to do with the sound you want. ;)