No, Denon (and Marantz too) does not use lower grade ones in the surround channels. The AVR-X8500H uses 8 pieces of the AK4490EQ. Same for the Marantz AV8805 AVP. All other models use the 8 channel AK4458.
120dB 768kHz / 32-bit 2 ch Premium DAC The AK4490EQ is a new generation of premium 32-bit DAC, with 2 channels of AKM’s VELVET SOUND architecture that has been widely adopted by well-established high-end audio companies.
www.akm.com
デノン、13ch/約1600W出力の “モンスター級” AVアンプ「AVC-X8500H」。HDMI 2.1やAlexaにも対応予定
www.phileweb.com
Equipped with a total of eight 32-bit 2ch DAC "AK4490"
For D / A conversion
, a total of eight 32-bit 2ch DAC chip "Ak4490" of Asahi Kasei Electronics (AKM) is equipped with a 13.2ch D / A conversion circuit. Constitution. This D / A conversion circuit is mounted on a dedicated board and is independent of the video circuit and network circuit to eliminate mutual interference.
D / A conversion circuit board provided independently
In addition, the layout of the D / A conversion circuit, signal lines, and power supply lines is optimized by using a dedicated board. Along with selecting sound quality countermeasures and redesigning the post lifter, the company claims to maximize the performance of the DAC chip.