So I've fortunately been able to log about 16 hours over the last couple days playing the cab and comparing it to the AE410. First, I really think the guys up here that said the cab may need to loosen are correct. It does sound a bit more low mid punchy now, though still not as much as the AE410 at the same tone settings, which is pretty much flat with both switches on. To get a punchier and bigger low end I turn the bass up to about 2 oclock with the GS. This yields a not quite as punchy as the AE but definitely a bigger tone that stays big further out than the AE. As far as the mids and highs I'd say its pretty much impossible to match the AE and vice versa. The AE is just not quite as in your face as the GS. The GS is all about upper mids to my ear (how I hear the AG500 compared to the DB750, more on this later) while the AE is more about punchy lows.
After experimenting I find the GS a lot easier to hear myself, especially when soloing over a band, compared to the AE. Those GS upper mids and highs really help me relax my right hand rather than trying to force loud notes to hear myself. On the other hand the GS can't match the more juicy bottom end of the AE even with the bass at 2 oclock. Again, the GS with bass at 2 sounds bigger but not low mid punchy like the AE even with the bass set flat. The GS punch seems to come more from the upper mids which gives a somewhat dry sound but very cutting.
So after tweaking the tone settings on my DB750 to both switches on, treble between 12 and 1, mids flat, bass at 2, and the cab tweeter at noon I have a pretty good tone. It sounds more articulate than what I'm used to out of the DB750, which I think was a part of what was scaring me at first. What is interesting is that I noticed the DB750/GS now sounded similiar to my AG500 into the Bergantino. Imagine the AG500 with a bit more of that tubey midrange and a touch more give to the tone and that's bassically the DB750 into the GS410. I admit this sounds a bit dry while practicing solo but seems to sit nice in the mix. Funny thing is I've been bringing my AG500/AE410 to all the gigs lately because its dryness and upper mids/highs really sit well with the band.
I did hook up both the AG500/AE410 and DB750/GS410 and the two rigs sound pretty similar. The DB/GS has a bit more give, tubey mids, and bigger tone while the AG500/AE has a bit more punch. The upper mids and highs in both rigs are very articulate and very similar sounding.
I have gigs most every weekend so we'll see how the GS does over the next month. I'll be listening to hear if it has enough punch and if the high mids don't get annoying to my ear. I have it a feeling, like the AG500, this new rig will sit well in the mix. We'll see!