Has anyone has used a small bandbass
 

Going to do a SQ install in my wifes Grand Am and was woundering if anyone has used a small bandbass system 2ohm around 1000rms?

Yes, But you have to be carefull with them. Bandpass offers some really good benefits, but it will not allow you to hear some of the things that you need to hear. In some cases, notibly big power ones, many people will drive the sub beyond its mechanical limits and because of the tuning, you may not hear it. What happens? You turn it up for a rocking good time, but are shredding the driver to a pulp. It should be designed really well, with the right driver and application. Is there a reason you would like to use a bandpass? Is this going to be a first order or second order bandpass? (port on both sides or just one on one side?)

I was thinking of trying a single tuned ported with an areo port through the rear deck straight into the cabin.
Reason; so my wife can't damage her subwoofer no matter what she does back there.
Reason two; my wife can't stand it when I pull up to the driveway and she can hear my hatch rattling like hell.
If your married you'll understand.
Wife,"You can put a stereo in my car but!!!!!!!"
:dunno:

ha ha..understand! It will work, but if you plan on building one, I would get some help with the tuning part of it.

I wonder if Alpine gives any recomends for a type x in a bandpass?
There sites owners manuals aren't working.

haven't heard

Bandpass enclosures are usually pretty big...so I don't know if you'll have much luck finding a driver that'll work in a small box...unless it's a small driver.

Also, a capable driver like the Type X would need a pretty big port to avoid port noise...which could make it difficult to build.

Could sound pretty good though...granted the enclosure isn't designed for too wide of a passband.

Infinity perfect 10 recommends .6 and .35 Cuft. with a 3in. port 10" length
which I would consider small.
Unfortunately the perfect 10 can not handle 900rms.
Alpine has no recommendation for a bandpass box for type x but claims it is suitable for use in one.

i would go fo it

Q
 

I am not sure a band pass is the best way to go for a SQ install... is there some reason you dont want to do a ported or sealed box?

Reason; so my wife can't damage her subwoofer no matter what she does back there.
Reason two; my wife can't stand it when I pull up to the driveway and she can hear my hatch rattling like hell.

why not just get a grill. i went to a local shop and got a nice black metal one for $10. saved me a few times already.

i can understand the rattiling part.it do you have any sound dampeing material back there?

a 4th order bp can be very nice for sq. transient response is typically better than everything but sealed enclosures. it is typical to experience some noise outside of the passband (mostly due to port resonance) but this can often be decreased by use of a low pass filter or a notch filter.

if you are totally set on using a bp but don't want to give up much room, perhaps consider using a second driver in an isobaric design to decrease required enclosure size for a given response.

there is a lot of output capability in bp enclosures and you can net very flat response as well (but not necessarily over as wide of a range as a ported or sealed enclosure). it is a good idea to use a large flared port to minimize port noise as all output comes from the port itself in a 4th order.

I have 2 AVI SL subs in 6th order boxes,they both sound great and impress me everytime I listen to them.Also they are increadably efficent...150w to the 8" and it rips!

Good post...good advice.

BP designs are typically not for SQ, they have limited response, are very slow and port noise is a huge problem using todays car audio woofers. The problem is the smaller the box, the longer and bigger the port should be. If you're set on a BP I would go with a BP4 design as they're smaller and have better power handling over a wider range than a BP6. Spend some extra time and a little $ and dampen the trunk properly to eliminate rattles and go with a sealed enclosure for the smallest box, best power handling and smoothest curve. :)

what do you consider "good" power handling? if a sub can reach full excursion with less power (which would be the case when comparing a BP to a sealed enclosure), i don't see how that is a bad thing.

the problem is because of the design of a BP, you don't hear the upper end distortion so it's much harder to tell when you're overdriving the woofer. Because the front chamber absorbs high frequency you can be pushing the woofer beyond it's limits and not hear it. BP's are good for lower power applications but if you've got the power, why not go for a sealed or vented enclosure :dunno:

Years ago when enclosure size was huge BP's offered great output for a 8 to 10" woofer with lower power needed. With todays car audio subs why bother? I can put the right 12" sub into a 15 liter enclosure and get incredible low end response with all the attack that a BP doesn't offer. I just don't see the point anymore.

Find me any high end system that uses a BP.


Installman

the only woofer's i recomend for bp is old school cerwin vega's the motor structures were so damn over built it almost didn't matter in over driving them.

i have had one band pass box in my life and had 2 thump gold subs 700 watts a peice max they worked well driven at 200 watts but sounded like sh*t cause a lot of the lower frequencies were almost inaudible, and this was a recomended encloser for them.

i know these aren't the greatest subs in the world but i built a box for them in a sealed enclosure they sounded 3 times better.