as long as the total impedance isn't below the rated impedance rating of the amp, it'll be fine
a 1 ohm stable amp can run at 1 ohm, 1.1 ohm, 1.4829898710973409872 ohms if you want
just so long as it's not lower than 1, it'll be fine
MOST 1 ohm stable amps can run below 1 ohm, too
most voicecoil impedances are lower than nominal, anyways
a 4 ohm voicecoil is usually between 3.5-4
SVC= Single Voice Coilwait whats svc and dvc?