http://wavecor.com/Test_Bench__Wavecor_SW223BD03.pdf
This driver is obviously optimized for small closed or vented cases. It does not have a pole vent and there is some talk about the air being forced through the gap to cool the voice coil.
Has anyone tried this driver free air at 20 Hz? I am concerned about chuffing which will preclude use as a dipole.
This driver is obviously optimized for small closed or vented cases. It does not have a pole vent and there is some talk about the air being forced through the gap to cool the voice coil.
Has anyone tried this driver free air at 20 Hz? I am concerned about chuffing which will preclude use as a dipole.
I recently tried a dual 10" W-frame dipole sub and it produces moderate bass down to say 35Hz. A single 8" won't move enough air in a dipole set up, in my opinion.
Well, this would be two per side in a tube / U-frame / cardoid and for a small room. Someone on a local forum even built one with a single 18W Revelator and says it is sufficient.
But back to my question: does anyone have experience if there is air noise from the motor?
But back to my question: does anyone have experience if there is air noise from the motor?
The low Qts will eventually help a little.
The declining response towards fs only due to Qts should be ~(-)10dB alone.
That could eventually limit the movement of the cones around fs at least a little.
You could use the calculator from Linkwitz for max SPL (which is not the same what you want but shows (SPL-, xmax-) limits of the design):
SPLmax
Don´t know what chuffing means but my open baffles (single 12", 830669) make some noise when I do frequency sweeps. I use a highpass now (very steep at 35Hz) to avoid it.
If you are going active I´d suggest you do something similar.
2x8" per side could be fine. If you don´t already have the drivers I´ll choose other drivers though.
I´d go for ones with more cone area (2x10" per side at least), higher Qts>=0.5 and less expensive!
If you want to experiment, the Visaton WS25E is no slouch in an OB setup. (2 per side min. and high pass @30Hz recommended)
The declining response towards fs only due to Qts should be ~(-)10dB alone.
That could eventually limit the movement of the cones around fs at least a little.
You could use the calculator from Linkwitz for max SPL (which is not the same what you want but shows (SPL-, xmax-) limits of the design):
SPLmax
Don´t know what chuffing means but my open baffles (single 12", 830669) make some noise when I do frequency sweeps. I use a highpass now (very steep at 35Hz) to avoid it.
If you are going active I´d suggest you do something similar.
2x8" per side could be fine. If you don´t already have the drivers I´ll choose other drivers though.
I´d go for ones with more cone area (2x10" per side at least), higher Qts>=0.5 and less expensive!
If you want to experiment, the Visaton WS25E is no slouch in an OB setup. (2 per side min. and high pass @30Hz recommended)
Last edited: