I like Marantz gear but I hate to tell you that HDAMs are not the reasons for me. In fact if I were to acquire another Marantz product I would try my best to get one that doesn't have the HDAMs. They do have their place in their integrated amps though, but the way they squeeze them in the AV7700/8800 AVPs and AVRs are marketing hypes that actually seem to do more harm than good as evidence in multiple bench test results. It is hard to believe so if you don't believe that I fully understand. That warm sound thing is another myth they created and got spread via internet hearsay. There is no truth to it and if you do a bling listening comparison you will not be able to tell one that has the HDAM "warm sound" to one that doesn't have it, such as the NR series.