I recently helped my nephew install a $200 12" sub/amp/box combo in
the trunk of his car (Olds Cutlass ca '87). We put the subs facing
forward, and he gets substantial bass. They were cheap Profile subs
and a Profile amp with a Q-logic sealed box, a Circuit City package
deal. I don't know the size of the box, but it was a pretty big one,
probably big enough for porting.

Here's his setup:
Profile CA400M mono sub amp (class AB?)
200 watts RMS x 1 at 4 ohms
320 watts RMS x 1 at 2 ohms
I think the subs are Profile, but I don't recall which ones. Cheap
pair of 4-ohm subs wired in parallel for 2-ohm load.

He gets excellent bass; I was amazed at the results. We had to turn
down the gain on the amp.


I just installed a similar setup in my Corolla. I'm not happy with
the bass.

2 10" Polk GNX10 4 ohm subs wired parallel 2-ohm (I even measured the
resistance to make sure)

US Acoustics USB-600D mono sub amp (class D)
200 or 250 watts rms @ 4ohm
300 or 375 watts rms @ 2ohm
The Web site states the larger figure; the manual states the smaller
figure, same input level.

Two Roadmaster sealed sub boxes from Wal-Mart (I have lots of things
to spend my money on, so I try to be frugal where I can).
The sub boxes are 0.6 cu ft; the subs require .66 cu ft.

I wasn't happy with the bass, so I stuffed 8 oz of poly fill in each
box. ...helped some, but not much. The speakers face rear, but are
up against the back seat. I need my trunk space. I moved them all
the way back, which helped a bit, but not much, so they're back
against the seat now. ...haven't tried them facing the seats.

So, is it the boxes, the subs, the amp, the car? We used the same
install kit in each car (4 ga from batt to trunk; 8ga from block in
trunk to amp.) Mine aren't as loud or as low as my nephew's. Should
I get a better box or bigger subs or more amp???? I bought from
Crutchfield, so I can send any of it back within 30 days.

Polk says to break the subs in for 20 hours at moderate volume levels,
so I really haven't hit them with full power yet. ...up to about 12
hours so far.



I also have a partial setup I bought for my 91 Burban, but never
installed:

A pair of JL Audio 10W1 8 ohm subs, but they require a .75 enclosure,
and an ESX Q275 mono sub amp. I don't have a box.

The amp is rated:
275 W rms @ 4 ohm
450 W rms @ 2 ohm

The Polks are rated for 175W rms each; the JL's for 125.

I'm open to suggestions for any of you wizards who have stuck with me
this long.

I need small-box 10" subs for the Burban, can go bigger in the
Corolla.

Put the stuff from the Corolla in the Burban and the JL/ESX in the
Corolla?

Buy bigger subs or bigger box for Corolla?