Type of Box

by bearman
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I'm just starting to build a system, and am I true novice. I listen to all types of music and want a system that will sound good across the spectrum. What type of box would you guys suggest, sealed, ported, bp? And what are the drawbacks of each?



Replies (6)
compvr15s on 08/8/2003 14:42:27
well i would not recommend BP its is made to sound really good at only a few frequencies and be loud at them frequencies. they sound ok through out the rest of the spectrum. i think ported boxes are along the same lines but they have a better spectrum and usually give higher spl with the same power, but less power handling for the subs. i would say sealed boxes are probably the best for your application, just depending on your subs and how much room you have for you box. sealed boxes are gonna be the smaller of the 3 but they can also be large just aslong as they meet the requirments of your subs. i have listened to all 3 types with many various subs. if your lookin for SQ id recommend sealed but thats my personal choice and for spl id go with ported. wait for the pros to answer this one too.. good luck with whichever you decide to go with


bearman on 08/8/2003 14:50:58
Could you clear up some nomenclature, SQ? and SPL?


bearman on 08/8/2003 14:52:59
Here are my sub and amp components:

Sub:
1 - 10" Audiobahn AW100Q
FS=30.5 hz
Qts=0.35
Qes=0.38
Qms=4.76
Vas=24 liters
Re=3.0 ohms
Le=3.0 mH
MMd=185 grams
RMS=400 watts
Freq. Response= 29Hz-1kHz

This amp will power only my sub:
MTX 282
Amplifier Type: 2-channel
RMS Power: 70W x 2 @ 14.4V
Bridged RMS Power: 280W x 1 @ 14.4V
THD at Rated RMS Power: <1%
Speaker Level Inputs: Yes
Preamp Outputs: Yes
Built-In Crossovers: HP/LP
Bass Boost: n/a
Frequency Response: 20-20,000 Hz
Channel Separation: n/a
Signal to Noise Ratio: >100 dB
Fuse Rating: 30 amps

Feedback as to the pairing would be appreciated.

baine on 08/8/2003 18:37:38
SQ = sound quality SPL= sound Pressure Level (loud and hard )
BP boxes are good for spl but thats it . Upside of a bandpass is they tend to hit and hit hard. Downside is that you cant hear your sub meaning if it is distorting you will never hear it and when you do ... its too late you have a paper weight. Ported boxes are good at Spl and SQ but they are big and they are tuff to make right . but they do boom and thump. Now sealed tend not too be as boomy but they give you tight bass and sound good , plus they are a lot smaller than the bandpass or ported. there is a good web site for subboxes

http://www.diysubwoofers.org/ this is a site for home woofers but the ideas are the same for most parts it will explain the diffrences and also about 4th 6th and 8th order bandpass boxes ,,, do not try to build one of them ... they are way to much for a beginner

Swez on 08/8/2003 19:32:27
This is a good combo for moderate bass SPL. About 200 - 225 watts RMS when bridged MONO to a 4 ohm sub.

As for boxes.. ported is recommended for this sub. Looking at 1.5cf internal air space and 1 port 3" dia, 6" long will do well.
Check your web link under 2002 products in the Tech Support section of Bahn's web site:

http://www.audiobahninc.com/frameset.html

You'll see the specs for this sub in .pdf and a sub box making program when you click "additional diagrams" and then box calculator section.

Swez

bearman on 08/11/2003 15:31:58
Although these aren't recommended for sealed, will it damage the sub if I go with a sealed? I would like to put this in the rear door of my '99 suburban and I don't think I can get enough air space for the ported. I really do not want a stand alone box. I was looking at the Q-Logic boxes that fit in the door. QL-C1SYT110DA16 TYPE 1 SINGLE 10" SUB ENCLOSURE, GRAY .



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