Kenwood sigma drive

[Special Ed]

I purchased a Kenwood integrated amp that has the "sigma drive" feature. It uses an extra line to the speakers for some kind of feedback. Anyone have a clue what this does, and is it worthwhile to hook up? I don't have the special cables that were originally supplied, of course, but apparently you can just use a smaller wire than your main cable to enable it. Here's what information I could find.

Kenwood's Sigma Drive has been widely acclaimed as an effective means of providing optimum speaker control and an extremely high damping factor right up to the speaker input terminals. In addition to the normal speaker leads, a special "Sigma" connection feeds distortion products caused in the speaker wires and in the speakers themselves back into the amplifier's NFB loop for effective compensation. The result is a total control over the speaker's behaviour, with optimum damping of unwanted speaker movement. [...] Sigma Drive is also employed between the pre-amp and power-amp stages where it compensates for any signal loss in the interconnection and permits low impedance drive throughout the frequency range.

 

[meanman1964]

A speaker driver when it moves it generate a small amount of voltage what goes back to the amplifier.Normaly the amplifier uses his dampingfactor to controle it.Kenwood uses the sigma drive to do that.That's the basic idea.