Cable Asylum: Re: internal vs external zobels? by Jon Risch Interconnects, speaker wire, power cords. Ask the Cable Guys.

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Posted by Jon Risch ( B ) on July 14, 2004 at 21:57:55

In Reply to: internal vs external zobels? posted by rhyno on July 14, 2004 at 12:08:51:

Such networks as used by MIT and Transparent are not necessarily a Zobel network.

A Zobel network is used to help reduce the inductive impedance seen by a source to that of a nearly pure ressitive loading. Put another way, a true Zobel network will be carefully tailored to exactly correct the amount of inductance present.

There are two possible sets of parts values that involve neutralizing the speaker cable inductance, or the loudspeaker HF inductance.

Any other values would not really be a true Zobel network, but rather, merely an impedance altering network.

Both these companies make use of various RC circuits, as well as RL, and RLC circuits, to provide an additional degree of design freedom compared to conventional cables. Knowing that they can fiddle around with the HF reactance aspects, they can design the cable for better performance within the audio band, and not be concerned with how the design is affected in the RF regions. They use the networks to control the cable behavior in the RF region, and in most cases, this helps reduce the adverse effects of RFI, etc.

I have posted before about RFI terminations for audio cables, see:
http://www.audioasylum.com/audio/cables/messages/80110.html

Jon Risch

• Cable RF Termination and Cable Loading   (Open in New Window)

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