different notch frequencies.
because a guitar operates at a different band of the EQ, the frequencies of the EQ might be a bit higher
(example: a bass EQ might have sliders for 40, 80 ,200,400,1000 and 2000hz, this is too low for most guitarists, who would benefit more with a mid or treble focused EQ)
as to why he would prefer it, maybe some people like to cut certain frequencies that aren't present on a bass EQ
