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#11 |
diyAudio Member
Join Date: Mar 2010
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#12 |
diyAudio Member
Join Date: Mar 2010
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Last edited by Ro808; 5th April 2019 at 12:33 AM. |
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#13 |
diyAudio Member
Join Date: Mar 2010
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The driver won't be available before the end of June.
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#14 |
diyAudio Member
Join Date: Sep 2003
Location: SiliconValley
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One might think that the B&C engineers CAREFULLY studied the BMS 4594HE + expired patents, and made a few IMPROVEMENTs.
One might think that the B&C marketing CAREFULLY set an initial low price to CAPTURE new designs and CAPTURE BMS customers. Personally.... I hope the B&C DCX464 forces BMS to lower prices on the BMS 4594HE to keep their customers. I only need two... ![]() |
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#15 |
diyAudio Member
Join Date: Apr 2003
Location: Aarhus, Denmark
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Looking at the impedance graphs for both the BMS 4594HE and the B&C DCX464, it seems that the B&C has a lower Fs than the BMS - actually around 250 Hz, which means that that on the 'right' horn and for hifi-use, the B&C may load down close to 200 Hz which would make it a lot easier to integrate to woofers:-).
Best regards Peter |
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#16 | |
diyAudio Member
Join Date: Oct 2011
Location: New Zealand.
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Quote:
Moteurs bms4594 16+15homs 1.4pouces BO ETAT DE FONCTIONNEMENT | eBay |
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#17 |
diyAudio Member
Join Date: Mar 2010
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The overlap between the mid and high diaphragm is a key feature of the B&C and the impedance peak is about 100Hz lower.
BMS 4594HE: ![]() B&C DCX464: ![]() Impedance: ![]() Last edited by Ro808; 6th April 2019 at 04:36 PM. |
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#18 | |
diyAudio Member
Join Date: Oct 2006
Location: San Diego
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Quote:
To me, the weirdest thing about the BMS patent is that it appears to come from Cerwin Vega, of all places. Both of the patent holders never worked for BMS. The names on the patent are Eugene J. Czerwinski and Alexander G. Voishvillo. The former is the founder of Cerwin Vega, and the latter works at JBL now (He worked at CV when the patent was filed.) He has a pile of patents for enhancements to the ring radiator design, in particular the JBL M2 varies the geometry all the way from the phase plug of the ring radiator to the exit of the JBL Image Control Waveguide. Check out my latest project on diyaudio, I use many of the idea in it. more info on the patent here : JBL M2 for The Poors my current project here: "Unitized" Image Control Waveguide |
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#19 |
diyAudio Member
Join Date: Oct 2006
Location: San Diego
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I did some more digging.
From what I can see, BMS never had a patent on annular compression drivers until they were granted this, in Europe: EP2640089B1 This patent covers their planar wave drivers. That might explain why they're so pricey; BMS owns a patent on it. Nobody else can produce one without a license. But from everything I can see, the annular compression driver made famous by BMS is actually a Cerwin Vega design. BMS references the CV patent, so I guess they're licensing it? Also, I am no lawyer, but it seems like the Eminence ring radiators violated the CV patent. Eugene J. Czerwinski, the founder of CV, died nine years ago. So maybe that plays a part here. RIP - Eugene "Gene" Czerwinski - founder of the Cerwin-Vega Amplifier Company* | Steve Hoffman Music Forums |
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#20 | |
diyAudio Member
Join Date: Oct 2006
Location: San Diego
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Quote:
You would think at some point someone would just start selling them. |
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