Lots of amps can potentially work with the BMRs, but the key questions are what sound characteristics are most important to you, what are you using now, and what specific improvements are you looking for? Otherwise this is really a crapshoot based on what other people may like and that may have nothing in common with your tastes/preferences. Given the Stereophile measurements a tube or lower-powered solid state amp is likely not a good choice here, and given the relatively low sensitivity/EPDR I’d be looking for an amp with at least 100Wpc that can double into 4 Ohms and is stable down to 2 Ohms. From Stereophile…
Philharmonic specifies the BMR Monitor's voltage sensitivity as 86.5dB/2.83V/1m; my estimate was within experimental error of that figure, at 86.2dB(B)/2.83V/1m. The BMR Monitor's nominal impedance is specified as 4 ohms; the impedance magnitude (fig.1, solid trace) lies between 3 ohms and 5 ohms from 80Hz to 5kHz. The minimum impedances were 2.9 ohms between 152Hz and 190Hz and 2.5 ohms at 1220Hz. As the electrical phase angle (fig.1, dotted trace) is high in several frequency regions, the effective resistance or EPDR (footnote 1) drops below 3 ohms over most of the audioband and below 2 ohms from 69Hz to 181Hz and from 861Hz to 5.5kHz. The minimum EPDR values were 2.63 ohms at 43Hz, 1.25 ohms between 93Hz and 107Hz, and 1.5 ohms between 1.5kHz and 1.6kHz. The BMR Monitor is a very demanding load for the partnering amplifier.
