My interpretation is that "mixes in the box" means intended to be used for a mix in a recording: rather than for performance through FRFR. EQ and resonance choices for a recorded mix are often not also optimal for performance. Of those among the 158-179 cabinets I've played with: found them to be rich and complex, and have more of the room baked in. They can be jacked around nicely with EQ in post if need be - flexibility at mixdown. But that spacial aspect that sounds great in a recording probably doesn't often translate as well to live: It can sound veiled in a performance space, compromising the visceral immediacy and focused punch that cuts through; which a simpler, close miced IR excels at (especially at high gain). It depends what you're after: The 166-171 Rumbles do nicely for cleanish or ambient material: As always: Let thy ears be thy guide.