Hi,
Please list parameters in order of their importance for a bandpass enclosure to cover 2 octaves. I believe the bandpass puts lots of strain on the driver so the cone should be pretty thick/sturdy. I know simple simulation in unibox can give out the frequency response but I want to know from parameters point of view what is more important and what is less.
Warm Regards,
WonderfulAudio
Please list parameters in order of their importance for a bandpass enclosure to cover 2 octaves. I believe the bandpass puts lots of strain on the driver so the cone should be pretty thick/sturdy. I know simple simulation in unibox can give out the frequency response but I want to know from parameters point of view what is more important and what is less.
Warm Regards,
WonderfulAudio
as far as I know the 4th order bandpass is not much critical on system Q if some ripple is accepted. Then the enclosure can have variation in volume.
Bose used pretty standard drivers even in eighth order bandpasses but here variations in driver parameters were critical.
Bandpass boxes can be easily damaged if driven hard because audibility of higher order distortion is lessened.
Bose used pretty standard drivers even in eighth order bandpasses but here variations in driver parameters were critical.
Bandpass boxes can be easily damaged if driven hard because audibility of higher order distortion is lessened.
here I had a random modification but end result sounded pretty well!
Also stiffened the cone with extra big dustcap added diy
Also stiffened the cone with extra big dustcap added diy
Depends on the order and how "correct" you want to be. If you consider the rear chamber, you want a suitable driver for that.
For 4th order the rear chamber is sealed, so you generally want woofers that do well in sealed enclosures.
Along similar lines, 6th order uses a ported rear enclosure, so typically uses a woofer that's more suited to ported boxes. Of course all of this is on a continuum, and how large a box you want, how you want to tune, etc. come into play.
From a more general standpoint, if you can find a woofer with much greater Xmech than Xmax, and/or one that is suspension limited (instead of the mechanical limit being the voice coil crashing into the back plate), those things can help as well. Bandpass boxes can mask some of the distortion you'd normally hear when a driver is being pushed too hard, so a more damage resistant driver can be a benefit. Or just use little power, a high pass/infrasonic filter, sealed rear chamber, etc., so you are less likely to get into excursion trouble.
If you are using large amounts of power, thermal considerations can also come into play, since some configurations may trap more heat than a standard box.
For 4th order the rear chamber is sealed, so you generally want woofers that do well in sealed enclosures.
Along similar lines, 6th order uses a ported rear enclosure, so typically uses a woofer that's more suited to ported boxes. Of course all of this is on a continuum, and how large a box you want, how you want to tune, etc. come into play.
From a more general standpoint, if you can find a woofer with much greater Xmech than Xmax, and/or one that is suspension limited (instead of the mechanical limit being the voice coil crashing into the back plate), those things can help as well. Bandpass boxes can mask some of the distortion you'd normally hear when a driver is being pushed too hard, so a more damage resistant driver can be a benefit. Or just use little power, a high pass/infrasonic filter, sealed rear chamber, etc., so you are less likely to get into excursion trouble.
If you are using large amounts of power, thermal considerations can also come into play, since some configurations may trap more heat than a standard box.
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