Steve Deckert
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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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