You have a great set up there, Pass amplification and Martin Logan pair really well. The Logan's are very special and the 13A in particular is in my opinion excellent and my favourite in the Masterpiece range
After having the ML Classic 9's for some time and been very happy with them, despite having to pair them with a couple of REL subs to compensate for my perceived slight lack of bass extension, I recently decided to upgrade to the Martin Logan 13A, however in the meantime I got to hear a pair of PMC Fact 12 transmission line floor standers, despite being relatively diminutive, I was blown away by them. This little speaker turned my attention to some of the larger PMC monitors.
I'm currently hoping to listen to the PMC MB2 SE, if there's the incremental improvement I expect over the PMC Fact 12, then I will have a very difficult decision, Martin Logan Expression 13A or the PMC MB2 Se. Of course I'm sure the wonderful Dave will sound great through either the Martin Logan or PMC speakers, I apologise for going off topic, but you know what it's like when you're contemplating a component upgrade.
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