Greets!
All else being equal it will begin rolling off at ~30 Hz to a ~22 Hz Fb and have more 'ripple' above ~100 Hz, but that's not an issue with a sub. Vent mach will be higher, so may require some damping if any synth/movie special effects have significant output near/at Fb. Of course these are idealized half space alignments, so the room and where the sub's located in it will alter them to a greater or lesser extent.
FWIW, the pipe needs to be ~109.4" long to reclaim the lost Vb, though it now has enough pipe action to damp the entire gain BW ~1 dB pushing the vent's harmonics down into the sub's upper passband, creating a ~3 dB broadband dip in the response above ~60 Hz.
Bottom line, if you don't have a tall ceiling like NP, then to get the most gain BW out of this driver in a cardboard tube will require stepping up to an 18" one since I don't believe there are any intermediate sizes.
GM
All else being equal it will begin rolling off at ~30 Hz to a ~22 Hz Fb and have more 'ripple' above ~100 Hz, but that's not an issue with a sub. Vent mach will be higher, so may require some damping if any synth/movie special effects have significant output near/at Fb. Of course these are idealized half space alignments, so the room and where the sub's located in it will alter them to a greater or lesser extent.
FWIW, the pipe needs to be ~109.4" long to reclaim the lost Vb, though it now has enough pipe action to damp the entire gain BW ~1 dB pushing the vent's harmonics down into the sub's upper passband, creating a ~3 dB broadband dip in the response above ~60 Hz.
Bottom line, if you don't have a tall ceiling like NP, then to get the most gain BW out of this driver in a cardboard tube will require stepping up to an 18" one since I don't believe there are any intermediate sizes.
GM
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.