Have a question that I don't want answered if you really don't know what you're talking about, so please only answer if you do. I'm making a typical bandpass sub enclosure; but still want the capacity to meet manufacture standards. Q1. My box needs to be 70.8Litres, do I make the sealed part 70.8Litres plus the port box, or do I make the entire thing 70.8Litres in total? Q2. How do I work how how big the port box should be in front of the sealed box? By looking at the pic, it looks 50% the size, but its just a random not to scale pic. I found this site; http://www.carstereo.com/help/Articles.cfm?id=27 But its pretty full on. Qbp? fb? Passband? Desired F3??? How am I meant to know all that, just curious do see what the calculation says but don't know all the figures. This is my 4th speaker setup and want to nail this one, so PLEASE don't post if you don't know what you're talking about. Some original photos have not been recovered yet.

i didn't realise the port goes in front of the sub? that looks like it would get excessive port noise. also i was under the impression most bandpass enclosures were slot ported. is the 70.8l the manufacturer recomendation for a bandpass? what sub are you using? maybe contact the distributor or manufacturer. (also ensure to tune the port lengthy for when the sub has run in not how it is now.)

very broad question man bandpass is designed to be tuned to a certain frequency and there is alot of varibles. port size (length and diamater), position etc. a band pass box doesnt need to be slot ported, but having a port in front of the sub may not be the best way to go about it you want the sound waves to resonate around the box and the port, having it directly in front would do half half, some would go straight through others would not. do some reading http://www.audiogearreviews.com/tech...n/bandpass.asp (http://www.audiogearreviews.com/tech/theory/enclosure_design/bandpass.asp) http://www.ajdesigner.com/speaker/bcb.php - this will help you with some of the terminology the caraudioaustralia forum would be the place to ask this kind of question im sure most of the people on that forum are just scripts and calculations hooked up directly to PHP scripting of the forum skynet if you will lol Some original photos have not been recovered yet.

Quote: Originally Posted by SIroller [View Post] i didn't realise the port goes in front of the sub? that looks like it would get excessive port noise. also i was under the impression most bandpass enclosures were slot ported. is the 70.8l the manufacturer recomendation for a bandpass? what sub are you using? maybe contact the distributor or manufacturer. (also ensure to tune the port lengthy for when the sub has run in not how it is now.) Humm dont know man, thats the most simple design i could find. Some people have done mazes and all. its a rockford fosgate t212d4. 70.8 is my subs man. rec. for vented box, so i was gonna work of that. i emailed them already asking there opinion to use this in a bandpass =]

Quote: Originally Posted by misk [View Post] very broad question man bandpass is designed to be tuned to a certain frequency and there is alot of varibles. port size (length and diamater), position etc. a band pass box doesnt need to be slot ported, but having a port in front of the sub may not be the best way to go about it you want the sound waves to resonate around the box and the port, having it directly in front would do half half, some would go straight through others would not. do some reading http://www.audiogearreviews.com/tech...n/bandpass.asp (http://www.audiogearreviews.com/tech/theory/enclosure_design/bandpass.asp) http://www.ajdesigner.com/speaker/bcb.php - this will help you with some of the terminology the caraudioaustralia forum would be the place to ask this kind of question im sure most of the people on that forum are just scripts and calculations hooked up directly to PHP scripting of the forum skynet if you will lol so you saying the box needs to be made around variables (every subs different) to make it a certain freq. in order to give it the proper bandpass effect? if so than my link site is perfect isnt it? that's the problem man the more i read about this the more it confuses me but i'll check ur links cheers i just want awesome sounding house/trance/techno/anthems/dubstep lol Some original photos have not been recovered yet.

power T2!! yum yum massive angry sub.. one of my favourites... actually had one for my vl but sold it and went with 4 tens.. if i remember correctly that sub requires 3x 3" ports in a ported box... it moves that much air..... why the quest for bandpass? id personally go with ported

misk your links are very helpful! so now how do i know whats best for me from sealed bandpass, vented bandpass and series vented bandpass?

Quote: Originally Posted by ADICTIV [View Post] power T2!! yum yum massive angry sub.. one of my favourites... actually had one for my vl but sold it and went with 4 tens.. if i remember correctly that sub requires 3x 3" ports in a ported box... it moves that much air..... why the quest for bandpass? id personally go with ported meant to be the best for house music, which is 90% usually what im listening too recommended port is 3"x14"-(3) and 56.63lt recommended vent in a vented box

why not just build it as a standard ported box with that dimension ports? if you have enough power running it im sure itll blow your mind ive fitted a few of the T2 15s as well and was very impressed with the recommended box Some original photos have not been recovered yet.

just curious cos ive never heard a bandpass box Some original photos have not been recovered yet.

It's important to realise man that although in theory it seems ideal to stick with manufacturer's reccomendations, it rarely is. If your serious about really perfecting an enclosure you need the help of some guys who are really in the know. The enclosure is more important than the sub itself

i can see where your coming from antranik, bandpass is supposed to give best of both worlds by producing very low bass (your choice of peak frequency) while still giving good punch. which is acheivable, but when the manufacturer is saying bandpass is best, did you say you were more after sq than SPL? bandpass is used to resonate at the subs strongest frequency for massive DB. of course it can be built for SQ, but its just a different design. its so *** hectic lol but the sub you have is a monster, you could whack it in a ported box with an amp to match and as said above it would blow your mind lol i reckon head into a car audio joint that sells rockford fosgate gear (dont just head to a JB, they will tell you that their 12" $150 special cadence is all you need for your laser) and have a chat to them about your needs and they might be able to show you some bandpass boxes already setup. its really impossible to guess with this ****, and even after reading everything (and maybe understanding some lol) its still hard to know what you need to do

not sure if you know, there is a program called bass box pro 6. its a box designer.. it virtually figures it all out for you.. you just find your driver (sub) in the program wright in all your measurements and liter of the encloser. choose if its sealed, ported etc.. its good might help you alot. i used it for my stereo setup for autosalon and it worked a charm.

Well from using the online calculators posted eailer, even with a single 10" the box wont fit in my boot unless i bring it right back and loose all space lol