Halo A21 Drive PSB Stratus Goldi's Adequately??

Title says it all. A21 specs say 400 watts output driving 4 ohm speakers.

I am driving PSB Stratus Golds with a Dussun V6i, 150 watts into 8 ohms, 300 into 4 ohms and have no problem whatsoever getting high output and deep bass. The A21 should be plenty
More than enough.