The BX1200 is a monoblock as well. Dual monoblock at that, with the ability to bridge into one 1200 watt amp into 4 ohms.
So yeah, I still think they are both big brutes of the same family. Both are some big ass trucks, but the BX1200 is the one with more options.
For what it's worth, though the BX1200 has a Graphic EQ I don't typically use it (as it has a switch to engage it or leave it off). I have it set up to use depending if I use fingers or a pick, or my wireless or a cable (each sounding decidedly different). And interestingly enough the sound I get with my fingers and wireless together is identical to using a pick with a cable, so the settings on my EQ can be applied to either of the 4 combinations. And it did come in handy at my last gig where the batteries in my onboard wireless died and it was easier to switch to a cable mid song at the beginning of a set. Plugged the cable in, engaged the EQ and it sounded just like it does with my wireless.
So, while the BX1200 has a lot of features and is very versatile, none of the features are just bells and whistles...it's all very well thought out and simple...and one can choose to just run it straight up without using any of them.
Still the B1500 is one damn fine head and would have bought it if the price were identical (though I am very happy with my BX1200).
Sorry for the B1500 hijack. Carvin makes some damn fine amps and all of them are a steal!!!