I liked the sound of my DB750 paired to a Berg NV610 better than the Aggie GS412. The GS412 was too boomy and the tweeter had to be all but turned off to eliminate high frequency hiss. The NV610 was much tighter, more punch, more clarity and more usable lows, very old school rock type sound. I also tried it with my Berg HT322 which sounded great, very loud and more modern tone than the 610.
Would have loved to try the DB750 thru a NV215 but traded it for an Ampeg SVT VR which is a perfect match for the NV610 and the type of music I play. Look at the Bergantino line, some of the best cabs for the money.