Bandpass builders: I need your help!

[1ndatrunk 10+ year member]

Since nobody seems to want it, I'm gonna try my hand at building a 4th order for my XXX. Its going in a trunk, and I already know its gonna be huge, but can some body give me the dims for the sealed and ported chambers, as well as the port area/tuning?

Thanks

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[misfit138 5,000+ posts]

Since nobody seems to want it, I'm gonna try my hand at building a 4th order for my XXX. Its going in a trunk, and I already know its gonna be huge, but can some body give me the dims for the sealed and ported chambers, as well as the port area/tuning?Thanks

Wouldn't it be easier to flat out ask for a design?

 

[1ndatrunk 10+ year member]

Wouldn't it be easier to flat out ask for a design?

Ok, can somebody give me a design for one?

 

[marcotheclepto 10+ year member]

prolly gonna have to pay for a design for bandpass, 80INCHES iamamp3pimp mobieous galacticmonkey... THUMPPER

 

[1ndatrunk 10+ year member]

Not a prob, just need to know if it'll even fit, since the regular ported box for this thing is so freaking big. My trunk has a stupid shape too, so I have issues

 

[Dr. Hertz 10+ year member]

I seldom have built a band-pass for a woofer that I loved the first time around. I use bassbox pro, and even then some trial and error is necessary. I just went through my files on bbpro, and have no RE XXX BP box diagrams....If I have time in the next few days, I'll design one for you-don't hold your breath too long. One thing I learned is to have the sealed side and the vented side an octave apart.

 

[mobeious 10+ year member]

I seldom have built a band-pass for a woofer that I loved the first time around. I use bassbox pro, and even then some trial and error is necessary. I just went through my files on bbpro, and have no RE XXX BP box diagrams....If I have time in the next few days, I'll design one for you-don't hold your breath too long. One thing I learned is to have the sealed side and the vented side an octave apart.

prolly dont know what ur doin if ur using BBP that program is horrible for bandpasses and it calculates for HA use anyhow so the graph means nothing

i have never had a box i didnt like or didnt sound like i wanted ....

 

[Dr. Hertz 10+ year member]

prolly dont know what ur doin if ur using BBP that program is horrible for bandpasses and it calculates for HA use anyhow so the graph means nothing

It is for BP, but I do say trial and error is necessary. Pretty sure I know what I'm doing, I've learned from some of the best (RTTI instructor/creator Mark Lowe), I'm sure you're the whip at whatever you do, all I have to do is ask you!

i have never had a box i didnt like or didnt sound like i wanted ....

That is proof you've not made a BP box right, made very few boxes, and don't know what sounds good! Does it say prefab FTW in your sig? You may jock yourself as boxbuilderextraordinaire, but that comment screams arrogant prick.

 

[mbrooky 10+ year member]

this is what mobieous wrote about a 15" Nightshade...NS has a fs of 41hz i believe the xxx15 is around 37hz so specs should be close:

The nightshade has a fs of 41ish hz so u really want to dampen anything under that so considering how much power u are going to have u could go 1.25-1.75 sealed and then if u want high output then the ported section should be in the 3cube area and for a less peaky box around 2-2.5 and i would tune around 45hz if u want a low end monster

 

[mobeious 10+ year member]

edit

 

[iamamp3pimp 5,000+ posts]

not a good thread for me.

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[galacticmonkey 5,000+ posts]

I started messing around with it a little bit, but your shape makes it tough. If you could get another 1" height you could fit it most likely. Its just that one sub that is so huge where it would have to be facing up or down wouldnt work too well.

 

[PV Audio 5,000+ posts]

prolly dont know what ur doin if ur using BBP that program is horrible for bandpasses and it calculates for HA use anyhow so the graph means nothing

i have never had a box i didnt like or didnt sound like i wanted ....

Not even Robert Bullock, Neville Thiele, Richard Small or Joseph D'Appolito have never NOT built an enclosure they don't like. Some humility works, because it's impossible to know what good is if you haven't heard bad.

 

[80INCHES 5,000+ posts]

pm sent to thread op

80

 

[boogeyman 10+ year member]

box 1.....front 2.642 cubic ft. NET....rear 3.3 cubic ft NET......port in front chamber 6 inch round port 20.19707 inches long....tuning frequency 34.25....passband frequency 20.57 hz- 57.02 hz...........very narrow passband but very efficient......Box 2....front 1.835 cubic ft. NET.....rear 2.015 cubic ft.NET.......6 inch round port 20.20532 inches long......tuning frequency 41.09....passband frequency 23.47 hz- 71.93hz.....I would personally go with box 2........if you want to use slot ports someone here can help you convert my round port suggestion to a slot port..........Im about to go eat good luck.