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Shunt path coils, DiAural reasonings

Posted by Arbelos (D) on November 30, 2001 at 03:33:57

In Reply to: Re: Foil coils upgrade posted by Bare on November 29, 2001 at 11:35:35:

I'd like to know (for my future experiments!) the exact context of this substitution experiences:
Which type coils did you replace with bigger foil coils? And which type crossover and speakers?

I had controverse discussions about caps with a Roederstein sales rep maybe 15 years ago. He was convinced that in his speakers MKP caps sounded dull and less precise than MKT, and this was maybe a question of system timbre matching (but stil wrong IMO ;-)

I really had much improved sound with a complete rebuild of the MG 3..3 crossover with CFAC coils, i had no negative points.

My argument of as low impedance to ground (shunt path) however is a strictly technical one, not exactly based on experiments as yours, so you might have one idea more.
Technically in a crossover of 12 dB or more, any resistive impedance in the shunt path reverses the crossover to finally a much attenuated 6 dB curve at some rel. low frequency. Maybe not dramatic, but neither very desirable in principle. There are additional (reverse) phase-shifts involved too: You simply get more bass energy into the tweeter, and - theoretically - more distortions and lower power margins.

There is a BUT:
The patent of DiAural is based as far as i understand it on a big flash of lateral thinking. Making the bug a feature:
You have the tweeter slightly moving or modulated, synchronously with the bass driver. With this effect one probably gets more identical pitch of all the harmonics in the very critical crossover region, where harmonics come out of both bass and tweeter drivers. Scratch, scratch...

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