Useful cabinet rating: gnarls, the measure of how gnarly they are, how well they respond to gnarly distorted tones and enhance them. A totally flat speaker is 1 gnarl. Upper mid bump that makes distortion more prominent and in your face moves it up the scale, this can be frequency voicing or speaker breakup. Dark speakers that cut off the upper content and make stuff sound cleaner and darker go below 1 gnarl. My kappalite loaded cabs, upper mid bump that gets on with distortion great without being obnoxious, 1.5 gnarls. Worn in Vintage 30s with the breakup and upper mids, but fundamentally right for guitar sounding, 2.5 gnarls. Exceed three gnarls and its horrible spikey nasty territory, slashed cones that sound kinda cool and such. New V30s 2.8 gnarls. Guitar speakers will tend to be 2-3 gnarls. Distortion into woofer drivers that are dark but serviceable, like cheaper bass cabs 0.8 gnarls. Playing into an actual sub, 0.5 gnarls or less, 0 gnarls being no audible output.