) asked me to compare Normal vs Lossy inductance models in hornresp to measured frequency response of the Alpha Devastator with the Eminence NSW6021-6.
I decided to be a bit more thorough and also compare vs the Alpha with a plugged port and the submax v3.
Since Josh (
) has measured this driver, I also included models with his measured specs including semi-inductance parameters. I know the driver he measured was on a different basket than these production models, not sure how specs would be altered.
EDIT: Per Josh’s advice later in this thread, models updated to factory specs, only modified with the data-bass semi-inductance model. /EDIT
), this may be helpful to you.
A huge thanks to you for the submax v3 design and many others.
Close mic measurements were taken with mic three inches from front of mouth. Submax centered, Alpha centered on port/qw divider. Cabinets were side by side, out into the room
I did forget to take close mic measurements without the HPF’s engaged. I added equivalent filters to the HR models to compensate. The cabs are in their final locations now, and submax is not moving again until I do.
Submax v3: Second Order Butterworth at 17hz
Alpha: Second Order Butterworth at 18hz
Alpha Plugged: Second Order Butterworth at 16hz
Alpha Devastator with one port plugged:
It appears to me that the normal inductance model is closest on Alpha and Alpha plugged. It is hard to determine which fits best on v3.
John, Josh, or anyone else, pm me your email address if you would like me to send you these sweeps to look at.
I performed sweeps on my other two readily-available enclosures for more data.
First is my Mini Devastator v1, loaded with a B&C 18DS115-4.
This enclosure stays much closer to the normal-le model.
Second is my Stereo Integrity HST18d2 mkIII in 10.5 cu ported at 11hz. I wasn’t exactly sure how to close-mic a ported direct-radiator, so I tried two methods. “Cone” is taken from center of cone, “cone/port os taken halfway between the edge of the come and the port mouth.
Not a great match on this one, but I believe the lossy le model fits best by a safe margin.
What I expected to show out of this outlandishly-longwinded post: Use normal le models for pro drivers, use lossy le models for long-throw theater drivers.
What I believe I actually demonstrated:
Use normal le modeling for devastators with pro drivers.
Maybe Use lossy le for the HST, it fits slightly better.
I have no idea what is going on with my submax.