Hello everyone I would like to build an OTHORN subwoofer and I saw that the Beyma 18SW1600ND was one of the compatible drivers. Well those drivers are no longer in production, But Beyma tells me they have a substitute that should work, the 18LEX1600ND.
Now my question is how could I tell if this drive is really compatible with the OTHORN sub design? Any help or suggestion will be greatly appreciated.
Now my question is how could I tell if this drive is really compatible with the OTHORN sub design? Any help or suggestion will be greatly appreciated.
Last edited:
Look for the thread on that design and substitute the TS parameters in the horn response info shared to take a peek. It’s really intersting to compare and. Contrast things and observe how the damping/suspension stiffness (and motorforce) can make or break some of those ‘high compression’ horn shaped resonators
Thanks for taking time to reply. I don't anything about hornresp. I guess I have to download it and enter and compare those parameters?
Greets!
Good question! During a tour of Altec's plant in '68 I asked what all did they test for and told +/- 10 % reference efficiency (eff/n0), which seemed kind of interesting since I knew their published Fs specs were often way off even after prosound apps break-in!
Fast forward several years and learning a bunch more speaker design theory and it became obvious: Thiele Small parameters equations – How each one affects the others
n0 is a percentage, showing how efficient the driver is at converting an electrical signal to an acoustical one. As a result, the bigger the number, the greater the reference sound pressure level.
n0 = (9.7822 * 10-10 * Vas * Fs3) / Qes
- n0 above is a ratio, not a percentage. To make it a percentage multiply by 100.
- Vas is in liters.
- Fs in Hz.
Last edited:
How do i make use of all info that he posted in that original thread? Also most of what I saw there was script for akabak. and and few screen shots of hornresp.
So am I correct in interpreting this as meaniing that this driver will work okay in the othorn sub?
Seems it will excite the resonances in the ‘horn’ but is a bit reluctant to do much of the work in between?
Motor force issue or its inability to play the lowest frequencies (Fb of 30hz) in such a small initial crossectional area ? (It bulges up near 40 hz instead)
*Just observing, I’m not sure exactly how this works *
Motor force issue or its inability to play the lowest frequencies (Fb of 30hz) in such a small initial crossectional area ? (It bulges up near 40 hz instead)
*Just observing, I’m not sure exactly how this works *
Last edited:
Definitely under damped, but +/- 3 dB b4 the inexpensive digital age use to be considered quite good.
Thanks for the honest answer. I guess I have to look for a different driver that would be available in my country.
Thanks for taking the reply. I guess this is another no then. This driver will not work ok with this box