High Damping factor is inherent in Icepower class D amps. My small Rowland 102 has DF=4000 at low frequencies and about 1000 at 1kHz. I said "inherent" because always two of four Mosfets are ON shorting load between power and GND. Feedback also helps a bit.
In traditional amps you can get high DF thru deep negative feedback which is really bad because of increased TIM distortions.
I believe that if you see spects like DF=5000 or THD=0.001% then something else has to give and it's usually the sound.
Very high DF is not needed since inductor in series with the woofer (about 0.08 Ohm) limits DF to about 100. At 20 kHz you'll get similar limitation by cable's inductive impedance.
Many people look at DF as a measure of the quality of the amp. I see DF as potential problem. Deep negative feedback caused TIM distortions make unpleasant sound (exaggerated odd harmonics) or even moments of silence after fast transitions (charge trapped at the output transistor's junction after saturation). This moment of silence is not audible (our brain fills the gap) but is fatiguing.
In traditional amps you can get high DF thru deep negative feedback which is really bad because of increased TIM distortions.
I believe that if you see spects like DF=5000 or THD=0.001% then something else has to give and it's usually the sound.
Very high DF is not needed since inductor in series with the woofer (about 0.08 Ohm) limits DF to about 100. At 20 kHz you'll get similar limitation by cable's inductive impedance.
Many people look at DF as a measure of the quality of the amp. I see DF as potential problem. Deep negative feedback caused TIM distortions make unpleasant sound (exaggerated odd harmonics) or even moments of silence after fast transitions (charge trapped at the output transistor's junction after saturation). This moment of silence is not audible (our brain fills the gap) but is fatiguing.