Not really. The GK cabs designed for biamping only provide that, biamping. Growl can be had by any well designed cabinet, whether it be a 410, 115, 212, etc. A Bergantino will surely provide the same amount of growl as the GK cabs would. The only advantage you have with the GK cabs is the biamp feature and the fact that GK cabs are designed for their heads. Other than that, you could get some nice growl out of an Avatar. I do.