So you're using the stereo 555's as monoblocks? Or bi-amping each speaker.The 555s are VERY good.
I have 2 for my focal scalas, and a third one for my borreson x3.
I am potentially selling the third one since I am selling the X3 for the Clarysis Piccolo and will opt for a tube amp for that.
If anyone is interested for the Rowland 555 (1st owner, original receipt can be provided) shoot me a PM.
-Frank