Upgraded Eminence Alpha15a 15" woofers - diyAudio
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Old 23rd June 2015, 10:20 PM   #1
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Join Date: Jul 2012
Location: Tel Aviv and Frankfurt
Default Upgraded Eminence Alpha15a 15" woofers

Eminence upgrades their legendary Alpha15a and they do it with PureAudioProject.

PureAudioProject launches two 15″ open baffle woofers that are direct upgrades of Eminence legendary Alpha15a.

OB-A15SE - 15” Ferrite Woofer for Open Baffle with 2″ Voice Coil motor and Shorting Ring

OB-A15SEN - 15” Neodymium Woofer for Open Baffle with 2.5″ Voice Coil motor and Shorting Ring

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Both are designed and manufactured by Eminence for Open Baffle and exclusively for PureAudioProject

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PureAudioProject Trio15TB with OB-A15SEN 15" Drivers

In most cases, both can replace the Alpha15a without the need to change the crossovers.

The new drivers are based around the performance characteristics of the Eminence Alpha15a and are designed to bring further refinement and musicality to our TRIO15 product line, as well as to any Open Baffle speakers !

Here is what Jerry McNutt, Eminence Product Design Manager says about the two drivers:
“These are the higher performance and lower distortion 15” drivers that have been specifically optimized for Open Baffle use. They have the same cone and surround as the Alpha15, but we went with stronger magnets and 2.5” VC motor to gain more motor strength, increase linearity, increase power handling, lower power compression, and to be able to add a shorting ring to lower distortion and lower the Le. To further lower distortion and cut down on basket ringing, with the ferrite model we increased the thickness of the highly ribbed and windowed basket form 18ga to a much heavier 16ga steel and with the Neo model we use our rigid cast Aluminum frame, a very open basket for minimum turbulence and Ridgid cast Al frame and push-button terminals. These new 15"s have 5.55mm and 6.03mm of Xmax to move more air down deep...”

Not only do they play low, their refinement and improved linearity allows them to extend into the mid-range with most natural sounding mid, up to 1.2KHZ and even more, allowing smooth integration with horn and hi-frequency drivers such as the BeymaTP150, Heil AMT and more; and it is for the first time and with our modular Open Baffle concept, audio enthusiasts that are not DIYers can tailor their sonic taste around their drivers of choice, simply by changing the baffles with the mid/hi frequency drivers and their crossover.

Q: How do these drivers sound ?
These drivers have similar sonic feel as the Alpha15a but they are more powerful and faster, more focused and clear, a bit dryer, deeper and punchier... and they play great mid in simple words, they are very musical, transparent and realistic !

Q: Can these drivers replace Alpha15a in current configurations ?
Yes they can ! In our Trio15TB the same crossovers work with all three drivers, Alpha15a, OB-A15SE and OB-A15SEN...

Q: How do the two models differ with regards to amplification ?
The OB-EA15SE (Special Edition Ferrite) is a straight forward replacement to the Alpha15a and matches any amplification, incl. low power SE tube amps. The OB-EA15SEN (Special Edition Neodymium) is a perfect match with higher power amps.

Technical Specifications

SPL Alph15a vs A15SE vs A15SEN

Mechanical Drawings OB-A15SE

Mechanical Drawings OB-A15SEN

for more information contact us to info@pureaudioproject.com

Last edited by zs1962; 23rd June 2015 at 10:43 PM.
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Old 24th June 2015, 05:14 PM   #2
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Join Date: Aug 2003
Location: Calgary on the Bow
Zeev: great idea wish you the best of luck with Pure Audio Project, excellent loudspeakers. Best regards Moray James.
moray james
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