@sid42 Thanks for the feedback. Glad that the C15 served you well. I have done as much research as I could, on balance, the MC C15 has received good reviews despite its simple form factor. This also echoes the views of experienced members here and in relevant forums. Appreciate also the tips given by members such as comments shared by @oddiofyl which are very useful.
I will be pulling the trigger on the C15. Am now looking at the 100 watt per channel MC 7100 vintage power amp to match. Its kinda of a similar make to C15 as in no bells and whistles (no autoformers) and also relatively low on cost.
My current amp is a Class D 150 watt channel power amp, an XTZ A2 300 which has served me well too. Its rather detailed, clean and has bass punch in terms of delivery, though it can have a tinge of sharpness at upper range frequencies at times. Nothing too distracting. On the whole it is good (https://www.xtzsound.eu/edgea2300.html#!/EDGE-A2-300/p/405983841).
Though 50 watts lesser, I am wondering if the 7100 can be smoother and richer yet retaining details and bass slam, particularly enhancing the very involving Mcintosh sound when paired with the C15 as compared to my XTZ amp. Or should I just stick to my Class D XTZ as the power amp to mate the C15. My speakers are Klipsch RP 6000f which are highly sensitive, about 96db.
Appreciate your thoughts.