Classic speakers to hunt down used

how old does the speaker have to be to be considered "classic?"

I would say all of the original Infinity Kappa series.

Mitch:

Accepting that there is a distinction between classic and vintage, you're talking at least 25 years to be considered vintage.

For audio I would say the vintage eras are:

hifi components: primarily made in USA (up to 1968); first Japanese wave (1968 to mid 1970's); second Japanese wave (mid to late 1970's); everything else

speakers:

60's; 70's; everything else

Regards, Rich

Kef 104.2
Celestion SL600
Dahlquist DQ-10