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Damping Factor (Read 1070 times)
walt
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Posts: 60
Damping Factor
01/17/11 at 05:16:50
 
 Can anyone give either the damping factor or output imp. of the Torii MKiii ?   Does it change while using the voice coil/cathode bias potentiometer?
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walt
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Posts: 60
Re: Damping Factor
Reply #1 - 01/29/11 at 04:41:01
 
 I talked to steve and damping is controlled by the 'bass tightness' potentiometer. Great to know.
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Steve Deckert
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If the 1st watt
sucks why continue?

Posts: 2439
Re: Damping Factor
Reply #2 - 01/30/11 at 18:42:04
 
Yes,  the bass aspect of the TORII MKIII can be manipulated with a trim control.  Being a pentode amplifier with no negative feedback, the TORII would tend to put out more current as the impedance of the loudspeaker rises.  Not an issue with most hi-fi speakers that use crossovers to maintain a fairly level impedance.  However, when you run something like a single driver loudspeaker with no crossover, the impedance of that speaker will likely have a peak at resonance that ranges somewhere between 30 and 70 ohms or more.  This type of load on the TORII would normally cause it to put out more power at that frequency, hence a lot of bass weight.  The voice coil feedback design raises the value of the input stage cathode resistor to lower gain any time the speaker's impedance rises.  

The advantage of this is real time adjustment based on the loudspeakers needs resulting in clean tight bass that can be adjusted to be heavier or leaner.  

Single driver speakers, most anyway, don't sound that good with amplifiers that have high damping.  The sound is flat and dry.  This is an alternate and superior solution to high damping which lets your sound breath with a refreshing openness.

Steve
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