I'm not even sure what sounds the most like the amp cause I didn't stick my ear down there
but...I still stand by the 409 for its smooth mid gronk.
that said, I take the 906 out for live gigs and leave the 409 safe and sound in the studio.
i sold the 609 or else I would do a really decent series of recording tests with my bogners instead of a $200 practice amp and play something worth listening to!