Topband: Tuned speaker revisited

[Rick Kunath]

Does anyone know if any of the tuned CW speakers are still commercially 
available?

I remember years ago seeing ads for these in the various ham magazines, 
but I haven't seen anything lately.

I am assuming that there is something superior (lack of phase shift over 
the passband or something) with the tuned audio approach over the other 
technique that was around back then like the Autek QF1 for less ringing?

My senior ears are interested ;)

Rick Kunath, K9AO