Two channel yamahas sound nice with the l100s. I would recommend something with power. Perhaps check out emotiva which sells quality and fair priced amps.
The L100s are fairly sensitive. A lot of people rocked their dorm rooms and living rooms on around 50 wpc back in the '70s.
It sort of depends on your room size. Today I'd go for an NAD integrated (e.g., 356BEE (80 wpc) or 375BEE (150 wpc)) and it'll be way better ampification than most L100s ever saw, which was usually a mid-'70s Pioneer or Marantz 40 wpc receiver.
True...NAD had some quality control issues back in the day...but so did Rotel...never had much luck with Yamaha myself...I would opt for older B&K amp/ preamp if it were me...a friend has a hi end Denon avr with his modded 100s...fun listen for rock
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