4 18's are in the van

[galacticmonkey 5,000+ posts]

Hey, if you need a new box design send me a PM and Ill see what I can do to help ya out.

Gotta get that thing loud!

 

[jeremiah 10+ year member]

20cubes should need a minimum of 240^2 of port going by 12^2 per cube. 4 6" ports gives you 113^2, so not even 1/2 of what you need. Might want to consider doing new boxes and just slot port them. Do you hear any port noise? You can probably get a lot more out of them if you redo the boxes with the correct port size.
Also it looks like the subs have a rubber gasket, so you didn't need anything to seal them. Not bad for your first attempt though, just needs some polishing up is all...

no thy dont:crap:

 

[jeremiah 10+ year member]

^^ wow galacticmonkey do you really have 24 12's?

 

[galacticmonkey 5,000+ posts]

Pretty soon.... I already got 8 amps and the 10 batteries from my last install. I had them running 4 BTL 18s in my wall in my daily car. Just gotta buy some subs and 4 more amps and Im set.

Anyways, enough thread jacking. PM me if you want more info about it. I got videos and stuff.

And DD, send me a PM if you want help with a design!

 

[CJL 10+ year member]

What 12's are you gonna run?

 

[DDeitz 10+ year member]

thx galactic and mls the box dispite bein ugly as sin is actually fairly solid no air leaks the cuts and corners are good..yea no rubber gasket on the subs i hope i didnt mess up too bad with the polyurthane...and galactic 24 12's is pretty sick cant wait to see that

 

[DDeitz 10+ year member]

yea no gasket its just a foam surround on the top

 

[MadAudio 10+ year member]

i dont want to be over critical because... well at least you tried .

but i would def. go back to the drawing board with that set up.first off as its been pointed out ports are to small. the box looks pretty bad . i'm sure you hurried through it to get them in and have a listen. now that you got that monkey off your back you need to go back and do it the right way take your time and build a proper box for those subs and run the proper wire for your power needs . its not the end of the world but the truth is if you built that then im sure you are capable of building a good looking good sounding box i see lots of reading in your future now get to work and dont let us down. check my avatar for an example of minivan bumpage. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[mjf 10+ year member]

you need to fix your wiring first.

 

[DDeitz 10+ year member]

well the actual speak wiring is due to going from 1 sub to 4 forgetting to buy more wire //content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif just used w\e i had laying around yea i got no excuse for that

as for the lack of more power wire never knew i needed todo both runs but yea time to fix the box //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

 

[IamDeMan 5,000+ posts]

Trick no good.

Oh it is a good trick though. I call it 6th order coupling cabin gain bandpass with a side order of ghetto. All the tr00 ballas do it.

 

[mrogowski 5,000+ posts]

Curious, but has it occurred to anyone here that his design might *not* be SPL driven?

Based on his box parameters, he built an overdamped design - one that is not peaky at any frequency and will probably generate the undistorted lows that subs are suppose to produce.

It is clear he wanted to move air in his large environment. He would accomplish that with four 18" subs of any brand (yeah, even Funky Pups //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif ) and I think he did. I am personally honoured that he chose Mach 5, and will help him with anything he may require assistance with.

Regarding ports, having two 6" ports per enclosure is sufficient to keep port velocity down to acceptable levels. Rounding the ends would help to reduce port noise even further. I can certainly understand the requirement for more port area *if* this build was SPL driven, but given the design, I don't think it is.

If however, he determines that port noise is evident, he could go with a third 6" port, but that would mean increasing port length of all three to ~18.5". This may have a negative affect on overall box volume since three ports this size equates to approximately 0.9 cubes. Adding a fourth would increase the area to over 2 cubes which means a *lot* of room lost.

And finally, covering a box with carpet hides a multitude of sins... //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

Best,

Mark

 

[IamDeMan 5,000+ posts]

At a 30hz tuning, I didn't think for 1 second he was trying to achieve maximum SPL. I can also understand 2 boxes to make it easier to remove/put in. I do beleive though if you want to make it ugly in construction, then cover and hide that shit before showing it off //content.invisioncic.com/y282845/emoticons/tongue.gif.6130eb82179565f6db8d26d6001dcd24.gif

 

[mrogowski 5,000+ posts]

//content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif

 

[Captain_Ahab 5,000+ posts]

I know its not for SPL, but I would still like to see what kind of numbers 4 18's can put up at that kind of power.