peppapig
MBL looks like never fall below 4ohm
Pepa, you need to look at the whole picture, ohms and -phase angle combined, which is call EPDR (equivalent peak dissipation resistance).
EG: a Wilson Alexia, is specified as a 4ohm speaker, but it has a dip at 60hz-80hz of 3.6ohms and a negative phase angle of -43 degrees, this presents to the amplifier a load of .9ohm!!!!! (Yes that's point nine of an ohm.)
This is enough to ruin any amps bass performance save for the very best that can deliver both big current and watts.
My friend (reviewer) has these Alexia speakers, and they sounded great with the Parasound Halo JC1 Monoblocks (designed by John Curl) we thought it doesn't get better that this, massive current and watts with high bias Class-A switch.
Then he reviewed the massive Gryphon Antillion Evo's and he owns it now instead.
Cheers George