Bob, two things impact the pace of release from companies like Denon and Yamaha. First, they have multiple products that are variants on a single core architecture. Second, new models frequently make only incremental changes to existing designs, while replacement architecture spends longer being developed by other teams. Third, they have a lot more R&D resources, which helps with the development of those different variants and with throwing a lot of manpower on dealing with problems like HDMI. (They also have been known to "resolve" bugs that slip through their R&D teams by making a new model that incorporates a fix and letting the older model stay broken.)

Outlaw has historically resisted the "new model year" approach. Like OPPO and some other smaller companies, they keep products in production a lot longer rather than finding an excuse to change a couple details and roll out new model numbers.