If any Volti user has access to a quad of AHB2, I highly encourage one to try to do a biamp quad monobloc setup pushing them. Of course up front you need world class preamp and dac. I was about to get a volti, but changed my mind and got a JBL 4367 (2 ways). Tested a single AHB2 just for fun, ended up as permanent 4x AHB2.
The air, the realism, is insane when playing any live recording. I spoke with someone who owns a TAD R1 or CR1, using the same setup.