look at your manuf. suggested air space...some of you guys have extremely huge enclosures for 1 or 2 subs....for example, i have 1 Polk MOMO 12" (600w PPI6000 @ 4ohms) in a .89cbft box that i built into the side of my trunk, where it bulges out...theres way more than 1.3cbft in those pockets and you can build something in there fairly easy and create a flush wall without taking up much trunk space at all....**sidenote**if you match up the size of the box to the sub in question, you will get a much cleaner sound....also, if you plan on building a box, and your good with MDF, dont just make a square box, put some angles into it, this will make the accoustics cleaner....

 

well hell, you're in cinci. why don't you just make a box for me and I'll come get it

good advice tho. that's what I was thinking about doing. 1 box on the side of my trunk.

 

NOT TRUE... A Larger sealed box will give a much warmer, true sound. Look up the SQ specs on many subs, the bigger the better(within reason) You are trying to tune the resonant frequency of your box to the sub. Smaller is NOT better, this is why when you use a small enclosure you're told to use polyfill, to increase the apparent size of the enclosure, but also to add some dampening to smooth out the response. Also a larger box will be more efficient. Also angles? where does this come from. angles cause refelections which will cause standing waves, which will in turn will degrade sound quality, also you may have phase issues doing this. If you mean angles on a port, such as a folded horn design enclosure you had better know what you are doing before you even start, arbitrarily adding angles to your box will do nothing but cause trouble.

Also it depends on what you are looking for. If you're looking for SPL(which I was) a large tuned box is you key. If you're looking for a very warm sound in your car, a large sealed box is for you. If you are worried about size, then go small, but be forwarned, while midbass extension is great in small sealed boxes, they won't cover the entire gammut of "bass"

 

Sorry Im late with this guys. I promised id attach some pics of my box and here it is. its an isobaric box with 2 kenwood 12s. one sub faces the other and they run out of phase so one pushes and one pulls. The box has a nice deep sound yet is very distinct. I'm sorry i present you a rats nest of wires but i transferred the system to my accord this summer after my legend died and i havent had time to clean it up yet.

Anyway, its a nice space saver, my $.02

http://www.picturetrail.com/gallery/...7548&members=1

 

Im not arguing that a bigger box isnt smoother sounding, i was just noting that i saw pics here, there, somewhere - i was just noting that some people have grossly huge boxes for their single 10 or whatever....and the reality is that if they went to a smaller box with the same amp, they would get a cleaner sound with tighter bass because the speaker wouldnt have to push as much air.

Each speaker is made to work well in a certain enclosure, whether it be big, small, sealed, bandpass, whatever...and the manufacturer allows you to tune your sound by giving you about a .5-.75cbft range of air space for that speaker, going outside of this will just create inefficiancy and distortion, no matter what sub, no matter how many watts your pushing.

Also, polyfill is for removing any resonance from the box, not for "increasing apparent size of the box"...if you have a 1cbft box, your always going to have a 1cbft box....all polyfill does is act as a dampener, which is a good thing on any sized sealed box.

 

NOt true, Polyfill is used to increase the size not reduce, I do not know the phsyics behind it, but I know that is what it is used for...Not decreasing the size....

 

Well, anyway, i didnt really feel like getting into this, as there are obviously as many opinions as there are systems, i just know what worked for me after several diffrent setups....my intent was to answer GIBSON's question....yes you can work a sub into your trunk without loosing space and still making amazing sound.....



...crappy pic, i know, but you get the idea...

 

Well I'm not certified any more, but unless physics has changed since I was an MECP master installer, polyfill is not just a dampener, the cavities and facets of the polyfill do increase the apparent volume of an enclosure. Try a search on yahoo, do "subwoofer polyfill increase" see what comes up. Before you argue at least absolutely positively know what you are talking about. I'm not guessing at my answers. If needbe I'll see if I can dig up some old acoustics books I have. If polyfill is solely a dampener, then why do you get a increase in SPL(as much as 10db sometimes more), aside from the fact that it decreases standing waves?

You're talking about SQ yet you have a single subwoofer firing oblique to the stage? Cmon, how do time align that? And yes I know I had a pair of them aiming towards eachother, acted like a single reflex box pumping through my passthrough, was pretty loud although a tad sloppy, but I'm not going for SQ.

 

illusion, just out of sheer curiosity... are you going to SPL? and if so what are you getting out of your current set up as opposed to your old set up? im sure the new one is better but just curious. i just got my stystem in from the company and im gathering the funds to install it all and get all the wires and dampening stuff.

 

wned: :thumbup: :thumbup: I could not help it...all in fun