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Re: since you mentioned Qes and R [message #38358 is a reply to message #38357]

Wed, 18 September 2002 20:07

Wayne Parham
Messages: 18688
Registered: January 2001

Illuminati (33rd Degree)

Adding series resistance to the output circuit makes the amp less able to short the motor's back EMF. That, in turn, makes it less able to provide electrical damping, which acts sort of like an electric brake for the speaker. To put this in perspective, solid state amps usually have output impedance less than 0.1 ohm but many tube amps have output impedance of more than an ohm and some have several ohms.

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subjectively in the "low" damp position [message #38368 is a reply to message #38358]

Thu, 19 September 2002 04:42

Sam P.
Messages: 307
Registered: May 2009

Grand Master

the sansui sounds, well, more "tube-like" is what comes to mind regarding the slight loss of low bass weight. Like a subsonic or "rumble" filter is engaged. Sound's good either way, just "different" enough to notice when doing an a-b comparison and listening closely.
Shaving that midrange rise will be a larger benefit from the coil than any slight decrease in Qes is how this looks to me. Eminence does "product improvements". Wayne's design "evolves". That's how the world works.

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