FWIW, the DB series is 92dB and 4 Ohms while the MM series is 94db and 2.7 Ohms.

3dB is a doubling of power, but not a doubling of perceived loudness (need @ 10dB for that).

The 2.7 Ohms will also source more power (than the 4 Ohms) through the amp which will also make the speakers sound louder (if the amp is up to the load).