Chris, to get back to your original question any even semi modern system is fine for Biab. I'm still running a P4 2.8 with 2 gigs ram and my laptop is a 3 year old Acer core duo with 1 gig ram. Biab is not resource intensive at all. I never get hang ups or stuttering. I have a friend who's still using my old P3 1g with 512mb ram and that handles the RT/RD's just fine. The only thing is a faster PC will regenerate the RT's quicker but if you freeze the tracks after you get something you like then even that isn't a problem. A 5 track RT/RD song will load almost instantly in that case and play immediately.
Your set up is similar to mine. I also have an antique Knabe grand I completely rebuilt myself in my living room along with a stereo setup using a pair of Altec Model 14's. I found them locally off Ebay for $450 a few years ago and man, what a deal that was. Those are the best home stereo speakers I've ever had and I've had a bunch of what could be considered classic audiophile setups. They listed for $2,700 in 1985. Those things are definitely overkill for my living room but I couldn't pass them up. They caused me to finally sell my very nice pair of AR3a's. I'm pushing them with an SAE. Unlike 99% of everybody else I could care less about surround sound. Who cares about hearing crickets in the corner or choppers in the parking lot? But, that's just me. Biab sounds awesome through that setup with my laptop on the piano. Btw with the laptop, the audio is simply going out through the headphone jack. Newer laptops have a good clean signal, older ones not so much. When I'm mixing a live recorded project, I do the basic editing and a rough mix in the bedroom using my fairly simple studio setup but then take it to the living room for the final mix on the Altec's.

Bob

Biab/RB latest build, Win 11 Pro, Ryzen 5 5600 G, 512 Gig SSD, 16 Gigs Ram, Steinberg UR22 MkII, Roland Sonic Cell, Kurzweil PC3, Hammond SK1, Korg PA3XPro, Garritan JABB, Hypercanvas, Sampletank 3, more.