Are these like a hifi amp?
If they're quoted as 2x250 into 4 ohms, they'll be 2x125 (ish) into an 8 ohm speaker?
Is the 2 x 250 so it can be connected into 2 cabs? If yes, can it be bridged for single cab use?
Or are most bass speakers 4ohm and I'm talking crap?