Bandpass Boxes

[btdickey99 5,000+ posts]

bandpass is not better for burping, look at the world record holders they dont use bandpass, why would u want to turn an 18" sub into a couple 4" ports,, bandpass is to make shitty subs sound better

wow thats 2 laughing at you

 

[BrianChia 10+ year member]

It depends on the driver. Sub X may reach its potential in a bass reflex design. Sub Y may reach its potential in a 4th order bandpass. Sub Z may reach its potential in a 6th order. No enclosure is superior to another. It depends on the driver, the vehicle transfer function, resonant frequency, the enclosure design etc.

What a bandpass design does is use port resonance to control cone excursion. A bass reflex controls excursion near Fs with a single port. A 4th order controls low end excursion by loading the driver in acoustic suspension while the port controls high frequency (above the passband) excursion. A 6th order uses ports to control overexcursion at both ends of the passband.

 

[80INCHES 5,000+ posts]

didn't somebody win some driveby event at a record level with a bandpass enclosure in a van recently?

yes eric

he had a 6th order series tuned bandpass

box types

1st order(free air)

2nd order(sealed)

3rd order(ported)

4th order(bandpass with 1 sealed chamber playing into 1 ported chamber)

5th order(4th order bandpass with a low pass filter)

6th order parallel tuned(bandpass with the rear chamber ported while the sub is playing into another ported chamber...both ports are seen)

6th order series tuned(bandpass with the rear chamber ported playing into a front ported chamber...one one port is seen and its fron the front chamber)

7th order(bandpass with the rear chamber using a passive radar while the sub is playing into a ported chamber..only the passive radar and the front chamber port are seen)

8th order( bandpass with both the front and rear chamber ported and both ports playing into another ported chamber...only 1 port is seen but theres 3 ports all 2gether)

80

 

[btdickey99 5,000+ posts]

Thanks you for clearing up my stupidity