Has anyone has used a small bandbass
03-19-2006, 10:26 PM
#12
500 Watt CAFz'r
Join Date: Nov 2004
Posts: 779
Originally Posted by Trojan
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.
Reason two; my wife can't stand it when I pull up to the driveway and she can hear my hatch rattling like hell.
i can understand the rattiling part.it do you have any sound dampeing material back there?
03-19-2006, 11:41 PM
#13
50 Watt CAFz'r
Join Date: Nov 2004
Posts: 167
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.
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.
03-20-2006, 01:35 PM
#15
Originally Posted by xxPunk0Ramaxx
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.
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.
03-21-2006, 09:44 PM
#16
0 Watt CAFz'r
Join Date: Mar 2006
Posts: 49
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. 
03-22-2006, 12:37 AM
#17
50 Watt CAFz'r
Join Date: Nov 2004
Posts: 167
Originally Posted by installman
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.
03-22-2006, 07:52 PM
#18
0 Watt CAFz'r
Join Date: Mar 2006
Posts: 49
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 
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
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
03-31-2006, 09:38 PM
#19
50 Watt CAFz'r
Join Date: Mar 2006
Posts: 50
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.
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.
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