Audio not fishin, I still use a pair of classic Threshold SA-1 monoblocks with a Pass LabsX-350.5 to bi-amp my MG-20r's. I can assure you that what you are looking for sonicly, as stated in your post, would be delivered by a Pass LabsX-250. In the first generation X-series the best sounding amps were the 250 single chassis and the 600 mono-blocks. The new X.5 series are wonderful sounding, a step above the first generation, but if its not in your budget, don't worry about it because a 250 well bring your whole system to another level. Hope this helps.
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