Thiel Owners

The 3.5's and 3.6's used different drivers, similar but different cross-overs. The 3.5's used bass eq/boosted sealed boxes, and with the 3.6's a passive radiator.

IMHO, the 3.5's are more coherent, have deeper bass response, and are easier to amplify. The 3.6's are more refined and suave in the mid to upper frequencies, and are capable of more dynamic range.

The amplification requirements of both requires careful consideration, especially for the 3.6's. With that said, most seem to prefer the 3.6's and I seem to be I the minority of preferring the 3.5's.