[help on 4th order C pillar]

I was going to use about 130-140 port area.

yes the lows come from the sealed section on a bandpass box.

OK so 3.5 cubes on sealed side for both subs. BTW the subs will be inverted. Thx for help.

[help on 4th order C pillar]

I have never build a 4th order box and want to give it a shot. So any advice would be great.

I have 2 Sundown zv4 15s D2 custom build for 2k rms each, wired to .5 ohm. I am wanting to do a C pillar build in my 97 4 door Blazer. This is currently on a BC3500 and later looking to get another one to push at 1 ohm a piece.

My question is on the sealed side what would be the best sealed cubes. I was thinking of doing 4 cubes for both subs and 8 cubes ported and tuned to 40hz. Does this sound about right for 15s on both the sealed and ported? and is tuning it to 40hz good or should a do 45hz. I love the low lows.

Thanks in advance.

97 S10 Blazer (4 Door) 4.3L

2 - Sundown Zv4 15s D2 custom built 2k rms each wired to .5ohm

Crescendo BC3500.1

300 Amp Alt

3 - Group 31 AGM batteries