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RE: They really are special

Posted by Satie (A) on February 28, 2011 at 22:12:05

In Reply to: RE: They really are special posted by josh358 on February 28, 2011 at 12:40:13:

I think the tradeoff of single ended to push pull is in better front launch from the single ended at "reasonable" volume vs. compression at high output and long transverse waves, and multipath diffraction on the holes of the PP design vs. great linearity at high output. It is not a clear superiority of one design over the other. The only truly superior design is a true ribbon - if you can make it work.

The Apogee ribbon mid concept is slightly compromised by weak damping that makes it shrill at high output, supposedly this was fixed with the last generation mid ribbons of the big Centaur models (?). See Galant Diva at Audiogon. So there is hope for us to do even better without a horrendous expenditure.

I think there is a CLD damping in the 3.7 and other QRs that you don't get with the wire planars because the wire and mylar both resonate some. I think the lateral waves are subdued into inaudibility by the QR structure (CLD effect - as I used on my tonearms) and this is sufficient to eliminate the snare drum grain and the kazoo effect that long time maggie owners eventually identify as a flaw (minor as it might be) in their speakers.

The midbass of the Tympani is not that thick. It is mostly a matter of the crossover. I was scheming about the issue looking for a driver to fill the original slot, but then you are not going to have a single octave driver and be able to cross it over at first order. Second order would be a problem too, steeper crossovers mean essentially that a digital crossover would be more effective, I am still not sure this would be a net plus relative to analog active crossovers for the tympani bass panels alone. My using the Tympani as a two way while the Neo8 array was being built and experimented with, revealed that it is not really that bad as a midbass, just that the design requires integration at highish frequencies while the cavity width resonance at 800-1000 hz needs to be taken out. So the higher the crossover, the steeper it needs to be. At 250/300 hz I think 2nd order should do.

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