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scubasteve101
Dodge Dakota
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10/24/2004
20:21:34
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 Subject: Too much power?
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I recently installed 2 Kicker CompVR 12's in the rear of my 1998 Dodge Dakota CC, i put them each in a 2.25CU FT ported box recommended by Kicker's website. Their plans have the port tuned to 38hz, my question is, when playing regular bass they sound great, very loud, no distortion. But when the bass goes real real low, like you can only feel it, not hear it, they move in and out so much and it looks like it may be hitting the subs max excursion. Is this b/c it is tuned to 38? Or overpowered? Kicker says to put your subsonic filter @25HZ and 24DB, my amp only goes down to 30hz on the subsonic and i wasn't sure on the DB, i have an adjustment for it, but it would have to turned all the way up to be at 24DB. Also, at times when the sub hits, it makes kind of a hollow sounding noise, its barly hearable (new word) and i don't know if it is bad or not, the sub is not hitting anywhere near max excursion when this happens. Please help anyone,
Thanks,
Steven
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Jim Z
GenI
10/24/2004
22:35:22
| RE: Too much power?
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"But when the bass goes real real low, like you can only feel it, not hear it, they move in and out so much and it looks like it may be hitting the subs max excursion. Is this b/c it is tuned to 38?"
Yep. When you play the subs below the port's resonant frequency, the woofer is "unloaded"- the enclosure/port is no longer exerting any control over the speaker.
"Kicker says to put your subsonic filter @25HZ and 24DB, my amp only goes down to 30hz on the subsonic and i wasn't sure on the DB,"
24dB refers to the slope of the subsonic filter. What that means is that the filter will "roll off" at 24 dB/octave from your set point.
I'd definitely set the flter to the highest you can and the steepest slope. Hammering a ported woofer when it's unloaded is a good way to destroy it.
"Also, at times when the sub hits, it makes kind of a hollow sounding noise, its barly hearable (new word) and i don't know if it is bad or not, the sub is not hitting anywhere near max excursion when this happens."
"Audible" is the word you want. What you're hearing is probably air blowing out of the port. Most cheap port tubes have sharp edges and mold lines in them which cause turbulence when air passes through them. Sounds kind of like a "chuffing" noise.
This is why I hate ported boxes. You might be happier putting these in sealed boxes.
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Jesse
Dodge Dakota
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10/26/2004
08:17:11
| RE: Too much power?
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38HZ is extremely low. The reason your subs are sounding floppy, or "bottoming out" is because they are trying to play a note that they are not capable of reaching. Try adjusting your filter to 50Hz and see if that helps. If you are using a Bass Mechanic CD or something of the sorts, expect your subs to sound like crap when they hit extremely low. This CD is a tool to adjust your system. If your subs sound like this during normal bass ranges found in every day songs, then follow my advice. If you can't seem to get it tuned in, go to a shop and ask for help. Most won't charge you to turn a few knobs.
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scubasteve101
Dodge Dakota
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10/26/2004
14:39:52
| RE: Too much power?
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Thanks guys, you were a great help.
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midnightdak
Dodge Dakota
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10/29/2004
11:23:59
| RE: Too much power?
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I have 4 15" kicker cvr's and i have them in sealed boxes. I like sealed alot better and its alot better on your subs too. The bass sounds cleaner and if the subs are in ported they want to hit there hardest when they really shouldn't.
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