[sdiy] Simple discrete Unity-Gain Follower ?

[Magnus Danielson]

From: "Czech Martin" <Martin.Czech at Micronas.com>
Subject: RE: [sdiy] Simple discrete Unity-Gain Follower ?
Date: Tue, 6 May 2003 10:14:12 +0200

> Right. The idea to have motional feedback on speaker cones
> is not that new, the first paper about that I have seen from
> 1970 or so. All mentioned problems of servo loops apply,
> also the strong forces on the cone due to servo action can
> produce partial oscillations of the cone...
> a unique "feature" of speakers...

Solving problems in three dimensions and time is much more challenging than
one dimension and time. Try 4 inch berylium dome compressor drive for the top
and 10 inch kevlar membrane for the mid, both with good horns applied.
Another approach is the VDOSC which works supprisingly well with its
constructive interference in contrast to the traditional destructive
interference that has plauged these systems for ages. When you fly a system
you should always check interference and see if you can trim it down to a
minimum. This causes strange walking procedures by a few guys, some mumbling
and the rare use of laser-pointers (yes, systems can be THAT sharp!).

IMHO will ported bas-boxes just be a wast of time and space. The more you
analyse it both theoretically, practically and auditorially, the more convinced
you get to ban them, or at least use conservative porting. The 3D/time
soundwave/impulse-response shape of ported boxes is just a big mess and they
behave quite unnatural.

Cheers,
Magnus