ARC SP line of units are single ended. You may want to check out SP16. Or LS-15....I ran mine single-ended for years and it was awesome.
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I used to own a LS-8. It was not a mark II unit though. I bought it right as it was replacing the LS-7. I did listen to both at the time and thought the 8 was much better. It had better bass, better soundstage. At the time, I used it with a Rowland 5 amp and Aerial 5 speakers. I only replaced the pre-amp with Another (LS-12) because of balanced outputs for my amp. I would highly recommed the LS-8.