As a young lad, I had subscriptions to Stereo Review and High Fidelity magazines. These mags had reader service cards in the back pages. I almost always circled damn near everyone for years. I had so much material sent to me, I'm sure they were sick and tired of it all.
I sure wish I had kept them, tho I still have some stuff from JBL, but that was a letter in response to a letter I sent them regarding power handling of my L100s.
I actually only have 3 pairs, 5 pairs of "vintage" speakers. The ARs, 2 pairs of Dynaco A25XLs, the Advent Model 3s and the Knights.
Wayner