I suggest you dig down a layer or two on the maker's website -- read the downloaded spec sheet documents. For example, not only are the Yamaha DXR and DSR series bi-amped, but so is the MSR 400. For JBL, not just the prx700 series, but also the EON 515XT are bi-amped.
FWIW, youmight also find that topics like this are better suited to the "Lounge" sub-forum. (That's where I'm more in my element.). Mark C.
Edit: I'm late to the party (again).