I have an AMPBH250 and one (soon to be 2!) BH-420's and I've read as many of the Thunderfunk and AMP threads here that I could, but my question is for folks that have/had both--how different are they? I know the TFB has a variable enhance and timbre (different than the AMP "tone bal" control?), the parametrics are voiced a little differently IIRC, the switch, added power, no bi-amp on TFB (which I actually use) and weight--but at the end of the day are these subtle differences or significant changes? Is it like the old 80/20 rule? Put another way, if I post in a TFB thread having only AMP experience, am I out of line?