I'm aware of the GK model you mentioned so just wanted to get info on the Carvin BX250.
Yes, that's the video I saw. There are sound samples, but it's not a very extensive review - I don't think the sound samples really cover the eq spectrum that much, nor fingerstyle vs. pick attack, etc. etc. etc. Different basses, etc. etc. etc. I think he doesn't really show off the treble response, if my memory serves me correctly.
Also - Watashi wa ego ga wakari mas. (Japanese for "I speak English.").
Just trying to get some firsthand info from an owner.
LL