Spectral electronics are designed to be single ended, and the company and dealers always recommend RCA. However if you're using a long cable run between the pre and mono's, i.e. 20-25', you should use XLR for its noise cancelling capability. The amps need the RF filtration provided in some networked cables to avoid any potential for destructive oscillation. While MIT is Spectral's preference, they used to, and probably still, recommend Transparent as well. If you can upgrade later to the DMC30SL series over the DMC20ii, you'll find it noticeably better with your amps and speakers.
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