I recently researched denon and yamaha and have some information concerning which models are more readily online.
there is also identical, and nearly identical models, that have 2 model numbers
here is a link to that post
hth
randy link to other post

Axiom M80, Ep600, Qs8, VP150, Crown XLI 2500 , DBX Driverack PA2, Focusrite Scarlet 2i4