I have no idea what LRDDMC is but your affect in this thread is not very pleasant. I am out.
Remarkable things are going on there:
https://www.diyaudio.com/community/threads/experiments-with-the-current-drive.417774/
https://www.diyaudio.com/community/threads/experiments-with-the-current-drive.417774/
I compared many different variants including negative output impedance. Didn’t see distortion reduction on measurements. Focused mainly around resonance. But THD from sine sweep i doubt is the most important. Soundwise i see some good things. Need more test i believe
Yes, I think I was talking about intermodulation distortion. Certainly worth looking into, if you have the inclination.
actually at the moment i am sitting listening to music comparing negative/current vs current/current vs voltage/current vs voltage/voltage vs negative /negative configurations.
for sure current above resonance more detailed sound with more details effortless, more joy. nothing new for me. At low end around resonance less output impedance is better by the ear. negative/current vs voltage/current very subtle difference as numerically not big difference. But dynamics better with negative impedance.current/current sounds good at mid high frequencies, but low end is kind of lousy, softer. Not so direct punch. Making low end with negative impedance fixes this problem, maybe something is lost at mids, because output impedance is lowered at mid if i do negative at resonance. Feels like at higher sound levels effect is more evident. Will check more in upcoming days. Just doing last confirmation for myself that negative/current configuration is the way to go for next amp.
for sure current above resonance more detailed sound with more details effortless, more joy. nothing new for me. At low end around resonance less output impedance is better by the ear. negative/current vs voltage/current very subtle difference as numerically not big difference. But dynamics better with negative impedance.current/current sounds good at mid high frequencies, but low end is kind of lousy, softer. Not so direct punch. Making low end with negative impedance fixes this problem, maybe something is lost at mids, because output impedance is lowered at mid if i do negative at resonance. Feels like at higher sound levels effect is more evident. Will check more in upcoming days. Just doing last confirmation for myself that negative/current configuration is the way to go for next amp.
so you can adjust amplifier output impedanceto slide from low in low frequency to high in mids and up? If so, how does it work? could you adjust the ramp up frequency with a pot? You could find the sweet spot.
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