piramis OP
The speakers are highly efficient here with 101 dB, but also they are 4 Ω in impedance
Yes as I said before, and that’s a nominal 4ohm, it will have dips even lower than that.
Look for an amp that has a 2ohm speaker tap just in case beside 8 and 4ohm.
The 100w per channel Music Reference RM200 has a 2ohms tap which should still give enough watts from that 2ohm tap for your 101db speakers in case you need to use it.
http://www.ramlabs-musicreference.com/music_reference_rm-200_hybrid_power_tube_amplifer.html
Cheers George