I've run a MA5200 with Legacy Audio Signature SE 4 ohm speakers now for 6 months. This was with McIntosh supports blessing that it would drive them or I would not have purchased it. It runs super cool, never hot, almost no heat at all. I hooked up a MA7900 and the volume knob percentage number is exactly the same . That tells me that it is putting out 200wpc at 4 ohms. The MA5200 sounds better to me than the autoformer unit. Nice mellow sound, not over done at the top but very clear and musical, it sounds like a Mc. I preferred it over the MAC6700 also with these speakers. I think they like the direct connect more than the autoformer. McIntosh does not want to put it in competition with their other 200wpc and more expensive units in my opinion so no ratings other than 8ohms.
