"Don't mix cabs" is a good rule of thumb for people who are buying brand new, are looking at running them as a stack most of the time, have a choice between two identical cabs vs a mix, and there's no significant price difference. In that situation, two identical cabs is a no-brainer. It pretty much guarantees you the full benefits of driver coupling, eliminates the possibility of a bad match if you're buying them without a chance to test them on the gig, and also nets you slightly better horizontal dispersion in most cases.
There's also the possibility of blowing drivers if you have a high-powered amp, and one cab in the unmatched pair has a drastically lower power rating.
In this case, it sounds like the two boxes are pretty evenly matched in terms of power handling, so the risk of damage is minimal. If you're saving significant coin, and if you will only stack both together on rare occasions when you need just that little bit more, why not have 2 different cabs, and therefore two different tonal flavours to work with?
I would think that the Rumble V3 410 would be an interesting contrast to the G-K...
There's also the possibility of blowing drivers if you have a high-powered amp, and one cab in the unmatched pair has a drastically lower power rating.
In this case, it sounds like the two boxes are pretty evenly matched in terms of power handling, so the risk of damage is minimal. If you're saving significant coin, and if you will only stack both together on rare occasions when you need just that little bit more, why not have 2 different cabs, and therefore two different tonal flavours to work with?
I would think that the Rumble V3 410 would be an interesting contrast to the G-K...






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