The first suggestion that comes to mind would be these from Omega:
https://omegaloudspeakers.com/products/super-3-high-output-monitor
Not quite a 100dB, but close enough for a small room like yours.
This Might Not Exist, Any reasonably priced, smaller speakers with 100db Sensitivity?
I am seriously considering putting together a system with power amp(s) that provide, at most 3.5 wpc. The Company behind them does not recommend using them with any speaker with less than 100db sensitivity.
Everything I am aware of is expensive and large to very large. Are there any quality speakers out there that would work effectively in a 12x10 room, and be capable of being driven by that amount of power? I would be happy to buy used, to keep the price affordable. I realize that the situation is not helped by the fact that many manufacturers inflate their claimed sensitivity.
Any expertise, recommendations or advice greatly appreciated.