i was just wondering what a band-pass is. i'm a newbie in this audio department thing. i just wanted to upgrade my system a little bit. since our 1st gen doesn't have a sub, i was thinking about getting the audiobahn sub set up.

http://cgi.ebay.com/aw-cgi/eBayISAPI...tem=1320987940

don't exactly have too much money to spend, just hoping someone knowledgable an point me the right way. Not looking for competition equipment or anything. just something better than stock speakers.

thanks a bunch guys.

and don't forget to answer what band pass means and it's +/-'s

 

there are 3 main box types sealed vented and bandpass
bandpass is the type of box you want if you want really deep and bumping bass. the only think that i see as a downside is that the bass gets distorted compared to a sealed box. but other than that you can get alotttt of noise with that type of box

 

unx979:
"there are 3 main box types sealed vented and bandpass
bandpass is the type of box you want if you want really deep and bumping bass. the only think that i see as a downside is that the bass gets distorted compared to a sealed box. but other than that you can get alotttt of noise with that type of box"

What 962.5 said is correct to some extent...you have actually 5 most used setups...but the three mainly seen are sealed, ported, and bandpass.

Sealed:
+Most accurate sound reproduction
+Smallest enclosure size
+Easiest to build
+Easiest to model
+Only worry is internal volume of box
-Not terribly efficient or special
...think of a stock TLS

Ported:
+More powerful bass response in a broad bass range
+More efficient
-Worry about internal volume, port length and width and placement
-Larger enclosure
-Harder than sealed to build
-Must be properly tuned
-Somewhat inaccurate sound reproduction
...think of a TLS with cold air intake...annoying to install but gives a broad power increase if installed correctly

Bandpass:
+Extremely powerful bass response in a narrow bass range
+Incorporates the accuracy of sealed boxes with the power of ported over the tuned range
-Worry about internal volume for two separate compartments, port length and width and placement
-Largest space miser
-Most difficult to build
-Must be tuned properly and possibly includes difficult modelling

I always go either bandpass or ported in SPL systems. For SQ systems, sealed box is usually better. For small systems wanting to get a lot of bass out of small subs, ported or bandpass. Also, in a car, the bandpass or ported box can be ported through the rear deck or rear wall, so as not to have to worry about dampening the trunk, or any trunk vibrations or loss of bass.

Austin519

 

cool thanks austin, now for a stupid question. what's SQ and SPL systems?

 

go to my website, http://www.rmscaraudio.com click on products and click the FAQ link there is a graph there and some information on bamdpass boxes. if a bandpass box is correctly tuned and designed with the right driver it can outproform most any sealed or ported box as far as sound quality, tight bass, and size. my single 10 is only .85 cubic feet and it hit's 132.5 db with only 200 watts. it also goes as low as 27 hz wich is a lot lower than even a 15" sub can usually go.

 

preludeshfan:
Ha still trying to sell your subs ?

unx979:
"cool thanks austin, now for a stupid question. what's SQ and SPL systems?"

SQ stands for SoundQuality systems...which concentrate on the overall clarity, depth, and accurate reproduction of sound...whereas SPL systems stand for SoundPressureLevel systems, in terms of dB...these are your very powerful, very loud, and very expensive bass systems.

Austin519

 

thanks again, so now that we understand what the band-pass boxes are, what are the advantages of having a bigger sub, like a 12 inch over 10 inch? would it really matter that much wheter i get 2 10's or 2 12's? and since the subs i'm interested in getting already have the enclosures built, i wouldn't have to worry about the tunning right? thanks again.

 

unx979:
"thanks again, so now that we understand what the band-pass boxes are, what are the advantages of having a bigger sub, like a 12 inch over 10 inch? would it really matter that much wheter i get 2 10's or 2 12's? and since the subs i'm interested in getting already have the enclosures built, i wouldn't have to worry about the tunning right? thanks again."

Hmmm...okay well let's see. First off there are two important things about subwoofers. First you have the cone area, and secondly the one way linear excursion (Xmax). A simple comparison I like to do is this...imagine a piston inside a cylinder...pushing water...now how do you know how much water it can move? Well the easiest way is to calculate the water displaced with the surface area of the piston multiplied by the distance it moves. Here the cone area is that surface area, the Xmax is that distance, and the sub is the piston. So you take Xmax*cone area and that will be the amount of air that the sub can possibly move (ideally). A 12" woofer has an advantage over a 10", and a 15" over a 12", and an 18" over a 15" etc...because of a larger diameter, so you now have a larger cone area. This translates into the ability to move more air. So in strict terms, yes it will matter a lot the different size subwoofers you get. Of course, you're also driving a larger sub, so you'll need more power. The larger the sub, the better it will handle power...and usually though not always a smaller sub run at almost max sounds a lot worse than a larger sub run at the same amount of power. You will have to listen to make sure for yourself though.

As for the box...it was made by Audiobahn so you should be fine...I think they're charging a bit much...but well I doubt you'll get them to come down.

Austin519