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It depends; a b-pillar 4th order wall's port area is going to work somewhat differently than a smaller 4th order bandpass. If you want a musical response, go with a proper amount of port area. It's the same idea with any ported chamber: your port area can determine overall bandwidth and peakiness, so it's important to know what kind of port ...
With a typical ported enclosure this means that the subs end up producing way too much sound in the 100-400Hz range (I learnt this from the sub I put in my brother's car). However with a 4th order bandpass enclosure the frequency response of the enclosure is much narrower, hence when the subs receive all sound from the radio (bass, mids, treble ...
The sub's mechanical excursion is usually quite a bit greater than the xmax, and with a sealed (or 4th order) enclosure you will have a lot of excursion as you get lower in frequency. As to your original questions: You mentioned putting hte sub (s) in an enclosure with an fsc of 55hz, but vent them at 45hz.
4. Norway. Jun 3, 2022. #1. As the title says, how does it work? A 4th order bandpass has one sealed chamber and one ported chamber with the driver installed in the wall between them, so far so good. But when the cone moves into the ported chamber, the pressure in the ported chamber increases, and the pressure in the sealed chamber decreases.
4th order for SQ is transient and punchy if done right. My favorite is a higher Q low side and a low Fb high side with a large port area tuned between 90-125hz. I think this type enclosure works best with a high compliant sub with a low qts. (Meaning the sealed side is a little small like 0.6 ft.³ for a 10” or .9 ft.³ for a 12)
Generally 4th order boxes are tuned higher than a normal ported enclosure also. Put the specs of the sub in WinISD and let it recommend the right box. It defaults to the flattest response. Bear with the extra lines in the photo (I was comparing a few different enclosures) but the light blue is a 4th order for an SQL-12 tuned to about 47Hz.
O k so I tried to build my first bp box with port into center armrest of my sedan. I know that most boxes built anywhere from 4 to 1 to 1 to 1 port to sealed. I plugged my 12 inch alphasonik 700wrms specs to a couple free online bp calculator and it put out .866 for ported side and 1.3 for sealed. So I built with a port of 1.25x4x5.75l.
4th order bandpasses can be made to sound great or made to be "one-note wonders". Both have their uses depending on what your goals are. In general, for those who want a "ground pounder" type setup, the rear (sealed) chamber should be of a volume to bring Fb (sealed resonance) to 40-50hz. The front chamber (ported) should be tuned to the same ...
4th order is a box type that includes ported boxes. All ported boxes are 4th order but not all 4th orders are ported boxes. Car Audio Subwoofer Enclosures Fourth Order/Bass Reflex and Bandpass. the "4th order" part is the slope of the roll off after tuning or 24db/oct. Sealed boxes are "2nd order" and roll off half as fast, 12db/oct. Reply Like.
A sealed box generally got a flat response in-car with a rolloff around 50-60Hz. If you design a 4th order with a Fsc a tad higher up you might might even reach 3 octaves combined with the transfer function of the car. At some point you will have to choose between extended bandwith or better efficiency.