I run M33s with a sub. I would like to connect them to an Explorer 2 in the future. Not sure how to get the sub in as well and pure MQA. The M33s are a good speaker though. I may try and swap the setup with my son's M60s. Are M60s an option for you? (I'm guessing not based on your no floor stands statement)

Cheers
Tom

Main: G61SL, 218, HD621, 2*7200SE, 7200HCSE, M6s, DSW, Apple TV 4K, NUC (Roon server)
Secondary: Wiim Pro, 3200, Audio Core 200
F80