Here's a head scratcher. I had some Merlin-supplied Zobel R/C Networks for their TSMs and never liked them. The TSMs went in for an upgrade, so I tried the Zobels on a lovely little pair of Celestion 100s I keep for backup. Voila, the effect on these was fabulous. Highs very much smoother. Whodathunkit? I guess the word is try it.