i don't mean to be the devils advocate here, but your two sub boxes are not at all symmetric. also what is the volume on those boxes? i can't imagine it would be more then .2 CUft which IMO is much to small. i know the kickers are renown for using tiny boxes, but damn....

 

I think you did a good job on your fiberglass enclosures, I know I couldn't do them myself that good. I really want to start experimenting with F-Glass. I do think your box cu. ft. is going to be two small. Those Comp VR's will need at least .75 cu ft a piece. I know all about working with what you have and within a budget. I used to piece all kind of systems together! Do what you can, we are not all millionaires right! If anything you are gaining experience and that is more than you can say for mist who will not even try and just pay someone to do it.

 

Oh wow, either use the 2 10's or the 1 12. DONT use both!!!!

OMG.

 

The on JL 12 will sound ALOT better than the kicker/ or both together. JLs rock and are made to be run in 1 or 3 so 1 will be fine and slam hard. They do not require a big enclosure either. Good luck with your finished product. So no amp for mids and highs.

 

JL's are not made to to be run in either 1 or 3...with the right voice coil configuration, they can be run in either 1, 2 or 3+ either with JL amps or not.

What about not amping the front stage? I'm not too sure about that...

 

nice work with the fiberglassing. but, i'm gonna go with the educated guys here and say please get rid of either the 2 kickers or the single JL. mixing sub types and facing them towards eachother = crazy cancellation!!!

 

yeah thats the thing i don't really understand...what is this whole "cancellation" thing??? im kinda lost on this subject

 

To understand cancellation you first have to look at phase. Phase changes with frequency and is effected by enclosure, interior acoustics and power. Whenever you have more than one speaker doing the same thing, there is a potiential for phase problems or cancellation. If enclosure volumes aren't matched, phase response can be different causeing the subs to "fight" each other instead of coupling and increasing output. Power has an effect too and if you run subs in stereo you should know that almost every amp made has a tolerance of 10%. That means a 100x2 amp can be 90x110 and still be within factory spec. I always recommend bridging an amp to eliminate this problem.

I was @ DB Drag finals a few years ago and a guy was running 6 Zapco 9.0's on 6 CV Stroker 15's. None of the amps were level matched to give the same output and he was really dissapointed his first run. The enclosures were identical, so I checked the amps output with a tone generator and a voltmeter. I matched the gain on the amps and got almost a 7 db increase in output. Proper setup is far more important than the brand of equipment or exotic install and almost no one has that.

 

cancellation occurs when you have two sound waves that have equal but oposite waveforms. for example: take a bathtub full of water and consider it the interior of your car. now drop a small stone in one end, and watch the waves propagate across the tub. this is exatly how sound waves travel. now take a second stone and drop both of them a little ways apart. if you look close, when the waves from both stones start coliding, there will be spots of big waves and spots of no waves. it is because when one wave has a "high" point, and it hits a wave at a "low" point, the two added together equal no wave (of cancelation, also called a node point). likewise, if you have a "high" wave hit a "high" wave, it will actually have twice the ampliftude (called an antinode).

now everyone is saying that when you have two subs facing each other they will cancel the sound out. this is sort of true. it is strongly dependant on the location of the subs and dimensions of the volume (trunk not box) it is in. if you set the two subs right in front of eachother they will most likely completely cancel each other out. but if your playing lets say 20Hz music, and move the subs so that they are exactly one half wavelength apart, you will in fact increase the volume (because there will be no cancelation at all). this is stupid in a real world situation because you will not be playing one constant frequency. so sub boxes are tuned to certain frequencies, and they will amplify that frequency, but other frequencies can actually be cancelled.

hope that helps a little. oh and as far as people saying mixing subs causing cancelation, scientifically i have no idea why they would say this (only thing i can think of is slight differences in the coil construction might cause a slight phase shift between the two, but this would certainly be very very minor). anyone care to ellaborate?

 

It's not the mixing of woofers per se, the woofers don't know they are working with different models. I have the full LEAP package, and if you look at 2 woofers in enclosures designed to give them roughly the same output curves, things would be much more clear as you look deeper. When looking at the excursion graph, they could be very different, phase response would be as well. I've measured 2 identical speakers in the exact same test in car with an IASYS and the phase response was very different. That is with the same brand/model of driver. It would be very difficult to model a driver to perfectly mirror the response of another. With the same brand, enclosure, power, environment you can at least come close.

There is a processor soon to be released that will allow you to correct the phase curve of a speaker at any frequency. This means that for a particular location you can phase align speakers to work perfectly together and maximize the systems potential in that environment.
I say just like everything else; KISS

 

holy **** someelse in the world used my KISS!
Keep It Simple Stupid!!!

 

dam... this hole cancellation thing soundz kinda scientific to me.. maybe when i'm in my twenties and like half way thru my schooling i'll get more of the wave inteference thingy??? i guess for now ill just kinda try to make everything look clean. BTW i just finished carpeting the two enclosures so i'll post pix up soon. ill be working on my amp cover thingimabob later during the weekend so pix comin soon!!!

 

sykou - simple way, pick either the 12 or the tens...

 

hmmm... what do you think would happen if i put in like some jl subs in the corner boxes. cuz thats what i was plannin to do in the first place.i no they might cancel each other out or something like that but do you think they will cancel out a little less???

 

Either way, ditch the middle wooden box.