Speaker Asylum

The delay line of the 63 is not a textbook allpass filter...

166.137.90.59

Steve O

In Reply to: RE: Don't the 63s have MILES of wire in their delay line... posted by djk on April 17, 2015 at 22:50:19

...see attached schematic. Notice everything takes place on the HT side of the step-up transformer at high impedance and that the inductors are not conventional.

Follow Ups:

Gee - djk 22:16:44 04/19/15 (1)
Gee, it looks exactly the same as the balanced type I posted.

The unbalanced type I posted is used by B&W in several models.
- Same only at the highest conceptual level... - Steve O 13:17:37 04/20/15 (0)
  ...and far from "exactly". What you posted is one section that might be used with a dynamic driver at say 8 ohms and using essentially off the shelf parts. The 63 design is composed of a number of cascaded sections, each driving an estat panel at HV/high impedance. The inductors are not conventional: notice what are drawn as shorted turns at each coil. The network provides successive delay and response shaping to each concentric ring. The length of wire in the overall network is much greater than would be found in a conventional low impedance network.

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