Here are some of the woofers I have simulated in my intended application (LR3 lowpass below 200hz). Some of them needed some impedance linearization. Still, the superiority of the 18W500 is quite obvious.
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The most amazing is to (re)discover all the "colours" of the mid-bass. The Alphas now seem to have a "one note bass" as someone has pointed before.
I was sceptical in the beginning but I decided to give a try and I do not regret. Against all odds, it works fine. I also did some simulations with Basta! and the results encouraged the experiment.
Truly amazing the audible results, indeed.
Yes, a high QMS bass driver will give awesome midbass. And Midbass is where OB shine already.
Personally, I have never liked the Alphas. They are cheap and go low, but do nothing "best".
If you want the best LF OB driver, get the Dipole15/Dipole18 or OB15/OB18 from Acoustic Elegance. If you cannot afford them, use closed subs or several H frames of cheap 18" woofers. But with their poor Xmax the Alpha15A cannot really do much.
...or 15" GPA's 515?
I use 12×12" GPA 414 in slot loaded open baffle.
Sounds good from 30-200 hz.
I also use double GPA 414 in open baffle from 200-1400 hz.
TAD2001 & Fostex T500A mkll on top.
I use 12×12" GPA 414 in slot loaded open baffle.
Sounds good from 30-200 hz.
I also use double GPA 414 in open baffle from 200-1400 hz.
TAD2001 & Fostex T500A mkll on top.
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The first open baffle speakers for me. Front panel: 80x40cm (31" x 16").
Drivers: Celestion TF1225CX, Eminence Delta 15LFA.
Xo is a hybrid: between woofer and coaxial done with minidsp 2x4HD, coaxial crossed to compression driver passively. The passive xo is actually designed by German magazine Klang&Ton, K+T Celeste was their design.
Xo frequencies, woofer to coax: 250Hz, coax to CD: 1900Hz.
Drivers: Celestion TF1225CX, Eminence Delta 15LFA.
Xo is a hybrid: between woofer and coaxial done with minidsp 2x4HD, coaxial crossed to compression driver passively. The passive xo is actually designed by German magazine Klang&Ton, K+T Celeste was their design.
Xo frequencies, woofer to coax: 250Hz, coax to CD: 1900Hz.
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I use as an open baffle design a Faital 15PRO400 as a low to mid woofer then crossing over to a Satori MW16P-8 midwoofer for the mid range and then finally to a SB29RDC tweeter.
The Faital of each channel works in with a very large open baffle subwoofer, a combination of 8 x 10 inch Peerless 830668 drivers to fill out the very low bass.
The Faital 15Pro400 is a very good driver but I would only use it in the very lower midrange as its distortion profile is not as good as that of higher quality drivers generally used for the midrange. As it was, I had to crank it down with a 24 ohm series resistor to match the sensitivity of the Satori MW16P-8. Maybe not the best choice in matching driver sensitivity but hey, distortion is very low and the amplifier loading is minimal. This is all part of my home theatre.
C.M
The Faital of each channel works in with a very large open baffle subwoofer, a combination of 8 x 10 inch Peerless 830668 drivers to fill out the very low bass.
The Faital 15Pro400 is a very good driver but I would only use it in the very lower midrange as its distortion profile is not as good as that of higher quality drivers generally used for the midrange. As it was, I had to crank it down with a 24 ohm series resistor to match the sensitivity of the Satori MW16P-8. Maybe not the best choice in matching driver sensitivity but hey, distortion is very low and the amplifier loading is minimal. This is all part of my home theatre.
C.M
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Hi mikey_audiogeek,
Are those your speakers? If so, how did you make the baffles?
Cheers,
Simon
Are those your speakers? If so, how did you make the baffles?
Cheers,
Simon
Dam. That's a superb looking design. Downright elegant. Is that a Kiwi original?
But how rigid is it? It looks like it would have high resonance in the Z plane to play its own tune. Better stick an accelerometer on it.
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Dam. That's a superb looking design. Downright elegant. Is that a Kiwi original?
But how rigid is it? It looks like it would have high resonance in the Z plane to play its own tune. Better stick an accelerometer on it.
Thanks!
Resonance... hoping these will help... Buy Pocket/Solid Dive Weight online at Marine-Deals.co.nz
