Speaker for 300b amp?

Benign impedance across the frequency spectrum and good sensitivity required. It‘d help to know the size of your room.

Charney Companion. I listened to quite a few high efficiency speakers before (and after) choosing these and I have no regrets.

Give the GoldenEar Triton 1r a try. They have a sensitivity of 92db and each speaker has a 2000w class D amp to handle the base making it easy to drive with low powered amps. 

JC

Lii audio F 15’s mounted in an open baffle paired with three subwoofers. The combination brings the clarity and presence of open baffle sound together with the body and substance of the 300 b’s in my elekit kit TU 8900. Currently using PS vain horizon 300 bs But also, actually like the 2A3 tubes in the amp just a bit better with some music.

PS this amplifier also works nicely with my Klipsch heresy ones.