Yes, you can copy fast cw. In few words, the CW speaker is not a filter with
group delay that causes the ring sound. The column of air oscillates on the
tube resonance, like when you listen to a flute, the sound is from the tube not
from the mouse of the musician. The audio from the speaker disturbance makes
the air column of air to resonate. Adriam project does a better job than my
killing any sound from the speaker. The best way to listen the cw speakers is
from the side of the tube, not like a gun pointing to your ears. The CW speaker
works like a practice osclillator.
I can copy 40 wpm at 6 Hz BW without ringing sound.
73's
JC
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