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In Reply to: RE: Don't the 63s have MILES of wire in their delay line... posted by Steve O on April 17, 2015 at 19:26:02
No, the coils are small, and the frequency response unchanged.
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...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.
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.
...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.
In addition the only section of the speaker that reproduces the top octave is the central area. The round circle in the middle is connected directly to the to the secondary of the transformer, no delay line. It is only the successive annular rings that are connected to the delay line.
The delay line is designed to be lossy. It has to be to accomplish its goal of attenuating more HF and output as the signal moves away from the central area in addition to creating a time delay.
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