Would someone need low Q speakers with it as they don't even specify the damping factor of the amps?
They surely know the figures but, with a ported enclosure, if a woofer's impedance goes down to 3 ohms at some specific low frequency, the damping would be reduced where it is most needed.
OTOH, as this product is THX cerified, I would think there's no reason to worry.
Cheers,
André