The last 2 numbers in Denon AVRs is the year.
Here are some specs.
Features Breakdown
* 140W/channel x 7
* Newly revised front panel and controls
* ALL NEW GUI Setup and control interface (front panel setup possible as well)
* Discrete Zone 2 component video output
* Integrated Wi-Fi
* Zone 4 digital input/output
* 0.05% THD
* 3 independent power transformers
* 6 independent power supply circuits
* Dynamic discrete surround circuit-HD (revised for HD audio formats)
* Analog Devices SHARC 21366 (1) and 21367 (1) DSP
* Dolby TrueHD and Dolby Digital+ decoding
* dts-HD Master Audio decoding
* Dolby Digital EX, dts ES Discrete/Matrix/Neo:6
* XM-HD 5.1 with Neural Surround
Are you certain that the 2007 model the OP has, has the loss less codecs? I could not confirm that. Such information that I was able to dig up suggested that they did not.