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kottonmouthking
03-13-2010, 03:15 PM
i have 2 cvx 12 dual 4. and have a box with a volume of 9856 cubic inches, a port length of 16" a heigth of 12" and width of 3" and i belive a frequency of 28hz give or take a few. My question is, is the frequency the box is tuned to the frequency that plays the loudest or what?

RJesus
03-13-2010, 03:19 PM
under that frequency your box supplies almost zero dampening.
However, your subwoofer's suspension should be able to handle notes under its tuned frequency. But I wouldn't overpower them if you're playing things under 28 hz.

9515ROB
03-13-2010, 03:24 PM
28hz is a little low for the tuning go with 33=36 hz u will b alot more happy

kr15
03-13-2010, 03:25 PM
the tuning could be deemed as the "sweet spot" and there is a roll off in both directions

kottonmouthking
03-13-2010, 03:28 PM
okay i have them powered by a treo 800rms @ 1ohm, so what you telling me is that 33-36hz would be the loudest.

RAM_Designs
03-13-2010, 03:28 PM
The box is generally the most efficient around 3-5hz higher than the tuning frequency(ie: the "peak"). This is of course sub and box dependent, but 5hz is pretty normal.

kr15
03-13-2010, 03:30 PM
33-36hz
thats a nice range. If you consider what Ryanm923 said, that puts you right at 33hz..

kottonmouthking
03-13-2010, 03:39 PM
now for spl comp i would play what frequency range?

kr15
03-13-2010, 03:41 PM
30s is low for spl. I dont know exactly what average would be considered, it seems as if i see alot of mid to high 40s

RAM_Designs
03-13-2010, 03:46 PM
now for spl comp i would play what frequency range?

Depends what vehicle you're driving. Find out where your car peaks at and build a box around that.

supermaxx123
03-13-2010, 03:59 PM
for spl comps you dont generally tune that low.

kottonmouthking
03-13-2010, 04:27 PM
I thought that was too low, and how do i figure where my car peaks?

Big_Nasty_Beat
03-14-2010, 02:35 PM
i had 2 12 cvx's and i tuned my box to 27 with a aq1200d and it hit deep and tight i cant stand bass that high the box that came with my sub is suppose to be tuned for 37 and thats anoying its loud but not my bass preferance if i were u i would tune it for a solid 32 33 and u do have about 4-5 hz up or down from where ur original tune is so u will be better off there.

RAM_Designs
03-14-2010, 04:23 PM
I thought that was too low, and how do i figure where my car peaks?

Ask around if you don't have a TL to do testing yourself.

supermaxx123
03-15-2010, 04:35 AM
i had 2 12 cvx's and i tuned my box to 27 with a aq1200d and it hit deep and tight i cant stand bass that high the box that came with my sub is suppose to be tuned for 37 and thats anoying its loud but not my bass preferance if i were u i would tune it for a solid 32 33 and u do have about 4-5 hz up or down from where ur original tune is so u will be better off there.

your reply had nothing to do with an spl comp...

RAM_Designs
03-15-2010, 11:27 AM
I thought that was too low, and how do i figure where my car peaks?

What car do you have?

kottonmouthking
04-03-2010, 11:57 AM
an 88 a corolla sedan with the back seat out. But my amp rack is where the backrest is and is blocking most of the hole would that be holding back a db or two?

RAM_Designs
04-03-2010, 12:03 PM
You can't really know unless you test it each way, but I imagine there is some more potential if you fully clear the opening from the trunk.

kottonmouthking
04-03-2010, 12:10 PM
okay thanks. Another question i had was is my amp to much for my subs or not? I have a treo ssx 800.1 and am runnig the subs @ 1ohm with the gain at a little over half. and the subs are rated at 750w rms

RAM_Designs
04-03-2010, 02:27 PM
I'm not familiar with the power ratings for the 800.1. But from my experience, more clean power is better than too little power, because when you have too little power for your setup, you're more likely to overdrive the amp trying to get the output you're wanting, which leads to either hurting your amp or your subs, or both, in the process.