I have tried E-matrix at 58 in my 7.1 and it played absolutely increadible. Sadly the cross broke after 3 hrs of play, in the typical Technifibre fashion. I have decided to install more durable cross and put PSGD at 57. The result wasn't very nice - I have lost control, I think, due to reduced spin, because power seems to be even more, or it only seems so. Not sure. Anyway, I think I should be looking for a soft string to cross E-matrix with. Not Technifibre, because it's hopeless in the crosses. Thanks for any info.