Philharmonic Audio - Dennis Murphy - Page 194 - AVS Forum | Home Theater Discussions And Reviews
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Old Today, 03:31 PM
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Dennis can you comment on the quality differences between the OEM 64-10 you use in the Phils and the more commonly available and expensive 70-10 and 70-20 versions? At some point in my life, I want to DIY a speaker and my speaker will def have RAALs in it. MadisonSound has the 70-20, but those are $300 each! I am just wondering if the larger and heavier version of the RAAL is really much better? And in what ways....

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Old Today, 03:40 PM
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Originally Posted by Elihawk View Post
Dennis can you comment on the quality differences between the OEM 64-10 you use in the Phils and the more commonly available and expensive 70-10 and 70-20 versions? At some point in my life, I want to DIY a speaker and my speaker will def have RAALs in it. MadisonSound has the 70-20, but those are $300 each! I am just wondering if the larger and heavier version of the RAAL is really much better? And in what ways....
Well, if you were holding the two in your hands, you would know that the more expensive RAAL must be doing something better. It weighs way more. The beefier innards allow a lower crossover point, and that's very important in a 2-way design. I know of only 3 woofers that will work well with the 64-10, and I'm using two of them (Ascend Dave is using the other one). In a 3-way, the difference is much less important. I would still give a slight edge to the 70-10 in terms of distortion below 4 kHz, but probably not enough to justify the price difference if you're crossing above, say, 3700 Hz.
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Old Today, 03:55 PM
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Dennis, if I were to order a set of BMRs and an MTM, how far out are you from shipping?
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Old Today, 05:31 PM
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Originally Posted by Dennis Murphy View Post
Those are the prototypes for the sealed .25 cu ft version of the Quasi-Affordables discussed above. Thanks for posting.
Curious again Dennis....Isee your Quasi woofer has a phase plug(Zaph Audio ZA14W08 5" Aluminum Cone). What advantages does that offer? I never quite understood the advanages of phase plug...like a waveguide?

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Old Today, 07:11 PM
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Originally Posted by Elihawk View Post
Curious again Dennis....Isee your Quasi woofer has a phase plug(Zaph Audio ZA14W08 5" Aluminum Cone). What advantages does that offer? I never quite understood the advanages of phase plug...like a waveguide?
Like all things audio, phase plugs are controversial. On horn-loaded compression drivers, they may in fact function as a kind of reverse wave guide. On a conventional woofer, the theoretical purpose, and the basis for the name, is to help prevent cancellations toward the top of the operating range caused by sound waves moving across the cone meeting out of phase and canceling themselves out. It's not clear, however, that the wave guide is big enough to help. The other purpose is to reduce cone mass. The plug is not part of the cone--the cone travels back and forth around the plug. You therefore don't need a dust cap to protect the otherwise open motor assembly. I suspect that's why it's used on the Zaph aluminum driver. It may help push the breakup point higher, which is in fact very high on the Zaph, which allows a higher crossover point. The utility of the plug is very dependent on the particular woofer being used. I know that Ascend decided the Seas "Curve" 6" driver worked better without the stock phase plug. But other Ascend speakers use drivers with phase plugs.
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Old Today, 11:12 PM
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How does one order these speakers or talk to someone about them before ordering?
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Old Today, 11:16 PM
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How does one order these speakers or talk to someone about them before ordering?
Really simple. You email info@philharmonicaudio.com with your questions and most likely Mr Murphy will get back to you in a few hours.
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Old Today, 11:23 PM
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Really simple. You email info@philharmonicaudio.com with your questions and most likely Mr Murphy will get back to you in a few hours.
Thanks I just sent another email. Maybe the first one got stuck in his spam.
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