Personally, I think these SIT amps could be perfect: DIY - SIT amps
For most speakers, the high Zout means the bass can be a bit loose (like most 300B amps). With AG’s this is a non-issue due to the active bass.
They are low gain and should be very quiet (my similar one was, which @Wayward has now for his mid horns).
It won’t sound like a 300B amp (less rose tinted) but that may be preferable.
The downside is it’s not a shiny blingy box 