http://www.the12volt.com/caraudio/boxes6.asp

 

what is an 8th order bandpass?





the first pic is a mass-loaded 1/8th wave 8th order bandpass designed for a 5" speaker they are large enclosures that one is 1.75 cf.
what makes them so good :


Quote
This alignment allows for establishing three distinct ripple points which can be apart for a response considerably flatter than that of a 4th or 6th. The response plot of both the 4th and 6th order is characterized by a pair of ripples with a dip in between them which can become considerable if the ripples are far enough apart. With 8th order, this dip can be "filled" by the proper alignment of the center ripple, in turn, creating two considerably smaller dips. The ripples can also be effectively aligned for a considerably narrower spectrup with response curve control more accurate than that of lower band pass orders resulting the alignment’s ability to concentrate the output on a very steep, very narrow range which translates to superior efficiency. Much like with 6th order, an 8th order band pass can resemble somewhat poor power handling as both the forward and back-waves are provided an escape pathway, hence, high-powered SPL applications warrant the use of drivers with tight suspension.

[ January 26, 2006, 07:53 PM: Message edited by: hofulstrof ]

 

ok how do i work my # for my size of boxes in the box?
also how do i get my port sizes?
[img]graemlins/dunno.gif[/img]

 

Yo man Iam not even looking at that **** tonight... [img]graemlins/freak.gif[/img]

gather your TS (hopefully very accurate) and start crunching some #s.... that **** is a mad crazy box...

[img]graemlins/bow.gif[/img]

 

yeah to bad i cannot design such fancy enclosures.
i dont think you can get a flatter responce curve.if your in a car invirnoment and you take into account cabin gain i think a 6th order bp would be better as it has a dip in the middle of of the fr.

the bandpass designs are are all based off the t/s parameters. and the math involved to properly design enclosues would blow you away.alot of people can do the 4th order bp anything above....


if anyone is intrested in the design for the 5" speaker it was designed to work with this one
clicky
it would make a killer computer sub set up. and if we did a group but it $13.00 each pm me if you want the design

[ January 26, 2006, 11:19 PM: Message edited by: hofulstrof ]

 

To hell with a 5" speaker.... I want to build one for 4 18" 06 RE XXX subs.. [img]graemlins/freak.gif[/img] [img]graemlins/bow.gif[/img]


Seriously, you can get flat as flat can be with a ported box.... something like this is for boosting output... [img]graemlins/headbang.gif[/img]

 

where do i start i know fs 36.87 , qts 0.598 , qes 0.628 , qms 12.212 , vas 1.098 cft , re 1.80 ,xmas 0.39 , sens 83.60 ,rms/peak(watts) 800/1100

the amp is a gp 1200.1

 

4 18's that would be sweet.if you drive a bus

 

You need to start by picking the desired 'Q' and tuning for each chamber...

considering one will effect the other... !

like I said Iam not getting started tonight.. [img]tongue.gif[/img]

 

zzz you might want to stick with a more simple encloseure sealed ported or abc. one wrong mistake with bandpassed and they sound like poo and have poor power handeling

[ January 26, 2006, 11:34 PM: Message edited by: hofulstrof ]