Bandpass!?

[solidcrowd 10+ year member]

Bandpass boxes ?? whats the deal and why is every hating

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[Raven 10+ year member]

People "hate" because properly made bandpass boxes don't "boom" or "thump" or "pound" or whatever you want to call it. They play smooth, fast, accurate bass, and they play it loud. It's hard to put into words, I've used BP before and it does offer a pretty unique sound.

 

[Worlddre 5,000+ posts]

get loud...tend to not sound as good as other configurations......more people prefer other things but its all personal preference

 

[Audionewb012]

would a bandpass sound good with like rock music and stuff?

 

[9512ds 5,000+ posts]

there are different types of bandpass... the ones on ebay are a lot different than most

 

[tRiGgEr 5,000+ posts]

I only notice "hating" when someone refers to a pre manufactured sub enclosure. A properly designed band pass enclosure, is not as easy as a ported box. And normally is much larger.

 

[Apocalypse boy 10+ year member]

yeh, i hate the size of bandpass enclosure but i love the output ....also if you worried about space and not worried money wise i would load the subwoofers isobaric and it'll save you some space. http://www.toxicforum.com i learned basically everything there is about a bandpass enclosure over there.

 

[Audionewb012]

how can you tell if a prefab bandpass will work with your subs. For instance, i have 2 alpine swr 12's and am looking at a couple bandpass boxs on ebay, how can i check to see if they will work well with these subs by using the dimensions or whatever they provide? or do u think the swr's would sound better in a diff style of box, sealed or ported?

 

[JimJ 5,000+ posts]

From diysubwoofers.org:

Low Q (
The driver's efficiency bandwidth product (EBP) should also be taken into account - this is derived from the Fs/Qes.

EBP = Fs / Qes50 or less = Sealed / 4th order Bandpass.

50 - 90 = flexible enclosure options.

90 or greater = Ported / 6th order Bandpass

All that being said, I wouldn't use a prefab enclosure regardless of the sub's parameters //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

 

[helotaxi 5,000+ posts]

how can you tell if a prefab bandpass will work with your subs?

It won't. That's the answer as far as prefab bandpass goes. A properly made basndpass must be specifically tailored to the sub(s) going in it. If it is off even just a bit it will sound bad, won't be as loud and could destroy the sub with minimal power. Bandpass boxes are very much a "one size fits none" type of deal.

Most of the people that say "bandpass ****" have only ever heard the prefab boxes. And based on what they hav heard, they are well justified in what they think. However, a properly designed and well built bandpass enclosure can sound great and be really efficient. As much a +6dB compared to a sealed enclosure. They get loud with less power but typically can't handle as much power either. The cone of the sub is being damped by 2 chambers of air and since the box mask the noises of a speaker in distress, it becomes quite easy to literally rip the voicecoil loose from the cone and not realize it until it is too late.

 

[solidcrowd 10+ year member]

Hey i have 2 bandpass boxes and they had 2 holes on the top and i covered up one on each so i could mount the amp in the center, (i also bolted them together through the back chamber and didnt mess with the fron) n then i made another hole in the back center of each box about the same size just a little smaller and i was wondering if i messed up anything.

 

[thefunkybunch 10+ year member]

Hey i have 2 bandpass boxes and they had 2 holes on the top and i covered up one on each so i could mount the amp in the center, (i also bolted them together through the back chamber and didnt mess with the fron) n then i made another hole in the back center of each box about the same size just a little smaller and i was wondering if i messed up anything.

probably.

as said properly build bandpass can be awesome. in some cars they are necessary to get sound into the cabin when the trunk is very well sealed from the cabin(bmw, lexus, etc) in this case, firing through the skihole or a hole in the rear deck in some cars is about the only way to get bass in the vehicle.

4th order bandpass boxes usually aren't overwhelmingly large, however 6th order bandpass boxes tend to get big fast. and then you have transmission lines and folded horns on the top of the 'big box' list //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[Audionewb012]

So how would i build a bandpass or find out the dimensions of the box, and ports and all that needed to properly build one to fit my 2 alpine swr's? are there any sites out there to calculate all that stuff or anything like that to tell you exactly how to build each piece of it to properly work with my swr's?

 

[thefunkybunch 10+ year member]

i'd call alpine tech and see what they recommend for a bandpass. what kind of airspace you'll need in each chamber, how much port area you need, and what it should be tuned to for your type of music. if not, then you'll have to just do some math. you could try winisd it will give you a ballpark, but don't rely on it completly