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for some reason my **** doesnt hit low bass. high bass is fine but some low notes seem to get
cancelled out at high volume. at low volume it seems ok like its gonna get louder when i turn it up but it sounds like its boggin out or something. i was rear ended 2 months ago, i thought maybe the trunk isnt seeled properly or something, i dont think thats it since higher bass is fine but i dont know what the hell the problem is. the amp and hu settings are where the should be. everything was professionally installed and i dont think the box size has anything to do with it cuz my buddy had the same size box and the same subs and was hittin really low with half the power. my set up is 2 dual 4 ohm kicker L7 12s and a kx 1200.1 amp wired at 1 ohm and another battery in the trunk. this has been frustrating the HELL outta me. ANY input from you guys would be greatly appreciated.

 

Maybe try a larger, ported box.... ?

 
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i was considering that but my buddy had a sealed box the same size if not smaller w/ 2 L5s from the year before( and i got double the power) and he was slammin low bass thats why this is so confusing to me. I dont know about wiring or hooking up systems so i dont know if a bad connection or something could cause this. ive read other replys to similar questions and i think some one said something about the way its grounded somehow cutting out some frequencies, also i notice i get shocked almost everytime i get out and close my door so i dont know if that is the problem

 

Almost everyone gets shocked when they get in and out of their car. Did you put pos & neg wires in the right places?

 
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all the wiring is fine as far as i know, the shop did the whole install so i dont know where its grounded. someone had apost about a month ago or so saying they lost some lower freq in there 6x9s and someone mentioned something about how it was grounded was possibly causing interferance or someting to that effect if i remember correctly, is that a possibility?

 
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How long have you had them? Solobarics usually takes about one or two weeks to break in. when I had mine, I didn't hit the low bass until about a week and a half of breaking it in. Also check the tuning of your amp.

 
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your friend has a different car im assuming. different cars have different frequency response...

 
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maybe they are out of phase?

 
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my amp is set at 75 hz the gain is half way and the db boost is at 12. how do check to see if they're out of phase?

 
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try facing the box to the rear

 
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and turning the crossover lowe,r like 60ish, with teh bass boost at zero and radio volume and amp gain to compensate for the loss of volume of bass at that one frequency

 
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you mean the subs facing the rear? cause they are now

 
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its probbaly the bass boost htzts killing it. bass boost is basically a 1 band equilizer, that boosts the bass at jsut one frequency, usually 45 Hz. 45 Hz is about the bass tone used in "baby got back."

theres a good chance that since your boost is all teh way up, its drowning out all the lower frequencies.

but I still think rearfiring is y our best bet, followed by proper tuning

 
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also how big is the box? is it smaller than 1 cubic foot each? if you want ot get some LOW low bass from the L7's, putting htem in a box more like 1.5cubes sealed with that power would really enhance the low frequency extension!

 
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with teh bass boost at zero and radio volume and amp gain to compensate for the loss of volume of bass at that one frequency

sorry, what do you mean?

 
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ok gotcha i'll give it atry right now

 
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i didnt build the box so i dont know how many cubes it is. how do you figure that out? also i have a 1 lb of polyfil in each chamber if that matters

 
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would a box 1.5 cubes have to be built in the trunk cause mine barely squeezes out of there now anything bigger if i build it out i wont get it in afterwards. would you be able to give me dimensions for a 1.5 cu box?

 
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like 17x16x25 inches is about 1.5 cubes sealed per driver.

you cna barely get your box in there? what kind of dimensions do you have on your box? ive been able to get pretty HUGE boxes in our civics!

 
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the whole box is 40 L x 11 1/4 W x 15 1/4 H. should each chamber be sealed on their own cuz mine has a square cut out of the middle board with the edges rounded so they're sharing the air space, dunno if that matters. and what about the polyfil? should i take it out? and is the 25 inches for the length? cuz if im understanding right that would be 50 long and there is only about 40 inches between the trunk arms

 
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thats about 3 cubes, so its perfect for a pair of L7's sealed! but what is this about about a square hole in the box? is yoru box PORTED? if so, i think we found our problem! (plus the tuning thing)

seal up that port, and watch that low frequency extension come back!

but I could be wrong, could you be a little more speciic about your "square cut out of the middle board"?

 
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thats 3 cubes? im not quite clear with your measurements is that
17L x 16W x 25H? and inside the box theres divider board that WOULD seal each chamber by itself. But the shop that built it cut about an 8 inch square in it. so when i push in on one sub the other moves out you know. would it be better if each chamber was sealed on its own rather then, iguess , sharing? keep in mind i know very little about this stuff so sorry if im making difficult. could voltage or current or any of that stuff effect low bass like this? i got a 2nd batt in the trunk for the amps or whatever but the stock batt and alt. dunno if that matters.

 
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Remember the thickness of the wood. It's 3/4" on each side, so 1.5" total off each dimension.

17" -> 15.5"
16" -> 14.5"
25" -> 23.5"

Internal dimensions are 15.5 * 14.5 * 23.5 /12 /12 /12 = 3.056 cu ft.
Outside dimensions are 17 * 16 * 25 /12 /12 /12 = 3.935 cu ft.

But the internal airspace is the only thing that matters. Outside is meaningless.

 
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no, not sealed chamber is fine, its the possibility of porting that wasnt.

but it seems that yours isnt ported, its sealed afterall.

and rearfiring, its about as good as it gets as far as ability for low frequency extension.

and they are capable woofers

so its gotta be all tuning, the bass boost for sure is too high, for starters!

 
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well i tried turning the boost to zero with the amp at aout 60 hz and the gain still half way up and i didn't notice it to hit any lower still kinda sounded almost distorted but just not as loud. I also called kicker and they cant seem to understand it either, they said to try turning the subs upward, tried it,face them to the front, tried it. they also said the amp might be going into protect mode because its drawing too much current. one guy said to cut two ports with 4 in pvc tubing 11 3/4 long. if porting is the awnser i'd rather build a whole new one. adjusting it to low freqs on the hu or the amp havent done **** at all. i think i tried everything i can think of or that has been suggested to me, the only thing i can think of is to just build a ported box and or dynamat at least the back half of the car.

 
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wow, i really wouldnt port that box myself, i guess they know best, but man, seems liek it would totally be chocking the woofers to death.

there's definitely some sort of issue going on here, id love to get my hands on your car if I could, but it seems that most likely its gonna be an issue best resolved through a physical going over, not something that can be reasoned through online.

 
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ok, i'll fly you out to cleveland..lol

i appreciate all the help though... gonna try a few things with it today if it doesnt work im gonna take em out back and beatin the **** out of em. maybe i just need to ruff em up a bit.. lol

 
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try lowering the gain maybe. clipping can cause it to sound like it's not hitting low.

i'm still betting it's some setting that is improper, rather than physical install. i'm in cleveland area too, btw. west side

 
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im on the east side myself... you got any bumps in your vic deuce? if so did you do it yourself or did a shop do it, and what shop? took out the polyfil today sounds a little better, i think i had had too much in there, even though thats what i was told to do... the gain is half way do you nstill think it could be clipping?

 
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if you had a TON of polyfill in there it my do something negative. but it'd take a lot.

i did my system myself. no one's mentioned wiring as a possibility yet, is it possible you have it wired for a higher impedence, causing the amp not to reach max power?

in addition to turning down bass boost on your amp, the HU settings are important too. you don't want the bass cranked there either, also setting the center frequency and extension of the bass if your unit offers it.

gain setting depends. it could be clipping if the bass on the HU is cranked high enough.