Yes, I know it depends on room size, listening preferences, associated equipment, etc. But... Has anyone had the opportunity to compare dual 20-39cs vs. a single Ultra? If so, what were your impressions? This forum has sold me on SVS, and based on correspondence with Tom V, I'm leaning toward the dual 20-39cs package. But since there's little price difference between that set-up and the single Ultra, I'd be interested if anyone has extended listening experience with both.