I bought 2 used a few months ago. They have a big ten years (we see the serial number), but they hit really hard!
I use them in bridged mono 8 Ohm driver for the subs (RCF ESW 1018 in LF18N401): nothing to say. Ok, these always demand more HP, but the CA 6 have impeccable behavior on these large membranes! So I guess on tops, they must excel much more!
A remake, certainly I will resume!