Plinius 250 one vs two as mono

--Crosstalk issues:
Isn't SA250 dual mono? If you use an analogue than crosstalk is already in the phono cartridge that cannot be reduced even with monoblocks. What is your preamp?
--You will be able to add 3...4 decibels to the loudness
--Larger power = larger bass control that could even drive speakers to exceed their bottom freequency bandwidth border.
--Monoblocks are more current efficient due to dedicated PS on each.
--Consider that if you exceed enough than you simply lost money. Isn't SA250 alone already takes off maximum your speakers can perform?

SA250 is expensive...i would look elsewhere considering your amps will be 3x the cost of your speakers.

Monoblocks produce a finer stereo image. Soundstage is more focused. Less crosstalk. The Plinius SA250 Mk IV is a fabulous amp. You will hear the difference.