I sold my massive Markbass + Ampeg HLF rig a few years ago and am in search of something smaller for practice or small acoustic sets. Anything larger and I just run straight to FOH these days. After drooling over Markbass Tube 800's for a few years, I got the opportunity to snatch one up when it popped up in the locals. Currently, I've got that running into my Peavey Headliner 112. My issue with the Peavey is that it's a fairly scooped sound that doesn't have much presence in the higher notes and doesn't have much clarity or power on the low b string. Running my old Markbass F1 into my Ampeg 410HLF, I only had to tweak the knobs slightly to get the sound I wanted, but with this Peavey, I've got knobs pointed everywhere but north to get 'the same' sound. What I'm looking for is a cab that handles midrange growl like a boss (thinking GK) and also doesn't get muddy or flabby on the low B string (thinking my old Ampeg 410 HLF though it was a little bit muddy). So yeah, GK 210 mid growl/clarity + the low end response of my 410HLF is ultimately what I'm thinking in my head. I'd looked into an Aguilar SL112, MB 102HF, or Darkglass's new DG112N. I'd played the MB 102HF and it sounded 'good', but lacked a bit of the mid range that I was after. I haven't had a chance to try the Aguilar or DG yet.
It's going to be hard to find something that has the thickness of a 410HLF in a smallish package. Volume, yes, the same thickness..... Big ask Maybe a higher end 115? Does Ampeg offer a 210HLF?
In GK I think the Neo 212 might get close, but as much as I like my GK Neo 112 II cabs, on their own they probably won't deliver what you're asking. A Mesa SW115 might be worth a listen and if weight isn't an issue, Ampeg has some 115 cabs that that may be voiced more like what you have enjoyed in your Ampeg 410 cab.
Agree you should favor a good 2x10" Beyond that, there are many excellent cabs. Personally, I use a Markbass 102P.
check out the Genzlers. I love the bass arrays but the more traditional tweeter designs also get a lot of love