Cardas Golden Cross bi wire but anything Cardas will work. Not TG, nothing silver. I think the speakers are voiced to work with Cardas and you can tell that the "House Sound" of Cardas agrees with Merlins.
I have the new tsm mme`s and am having terrific results with Gregg Straley`s Reality cables. Less than $500 for a pair of his sp. cables and ic`s combined. They`re made of seven strand, oxygen free copper which the merlins like.
I have all Cardas Golden Reference including bi-wired speaker cables on my VSM-MX's. I recently substituted Gregg Straley's Reality Cables for both the speaker wires and I/C's with great results - faster and more focused. Bass was even better articulated. Definitely more "up front" presentation which you may or may not like depending on your taste. They are a bargain ($225 and up) assuming they work well with your components like they did with mine. If you don't like them they usually re-sell instantly.
I highly recommnend the use of Purist Cables with the Merlin VSMs - particularly the Aqueous Annniversary (although I am pretty sure Dominus would also work well, if you have the $$$). In my system, it outperformed, among others, Cardas Golden Reference by a significant degree.
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