Setting the Record Straight on Denon X3800H DSP and Dirac ART (Addressing the AI Rumors)
Following up on the recent discussion where a chatbot claimed the AVR-X3800H mutes rear surrounds or handles Dirac ART via an inferior, single-chip architecture compared to higher-end models—
this information is entirely incorrect.
Let’s look directly at official Masimo / D+M technical documentation to clear up the confusion regarding silicon, architecture, and channel allocation.
1. The Silicon Reality: One Single Chip Across the Entire Lineup
The rumor that the X3800H has "one chip" while the X4800H or flagships have "two physical chips" is a complete myth.
Every single receiver in the current generation—from the entry-tier
AVR-X3800H up to the flagship
AVR-A1H and
Marantz AV10—shares the exact same computational DSP core:
- The Processor: They all use exactly one single (1x) Analog Devices "Griffin Lite XP" ADSP-21593 processor.
- The Layout: The ADSP-21593 is inherently a dual-core chip containing two 32-bit SHARC+ floating-point DSP cores running at up to 1 GHz, alongside an ARM Cortex-A5 system core on a single piece of silicon.
- The Source of Confusion: The internet (and subsequent AI scrapers) conflated "dual-core" with "two physical chips," or mistakenly compared them to older generations (like the X3700H or X6700H) which actually did use multiple separate, lower-spec processors (e.g., 2x ADSP-21573).
2. Hardware Architecture Comparison (Per D+M Internal Documentation)
| AVR/AVP Model | DSP Layout | DAC Architecture | Max Native Channels |
|---|
| AVR-X3800H | 1x ADSP-21593 (Dual-Core SHARC+) | TI PCM5102A x 8 | 11.4 Processing |
| AVR-X4800H | 1x ADSP-21593 (Dual-Core SHARC+) | TI PCM5102A x 8 | 11.4 Processing |
| AVR-A1H / AV10 | 1x ADSP-21593 (Dual-Core SHARC+) | ESS ES9018K2M x 10 | 15.4 Processing |
3. Why the AI's "ART Channel Restrictions" Claim is Fake
The chatbot's claim that Dirac ART enforces a hard-coded limit of 7.1/7.2 playback and mutes rear surrounds or height layers on the X3800H is flat-out wrong.
- Full 7.4.4 Playback: When Dirac ART is engaged on an 11-channel setup, all 11 speakers and subwoofers remain fully active for native playback content. Immersive Atmos object panning is completely unaffected.
- The "Support Channel" Misconception: The confusion comes from Dirac's Support Channel matrix. Because small ceiling or rear surround speakers lack low-frequency extension, they are often restricted or attenuated from acting as dampeners (support nodes) to cancel out bass reflections from other main channels. They still play their own native audio perfectly—they just don't do the heavy lifting of room correction calculations for other speakers.
4. The Real Reason Behind Firmware Rollouts
Because raw computational silicon power is completely identical across these models, tier differences come down to
software licensing, analog board layouts/DACs, and separate firmware code branches required to manage different native channel matrices (11 channels vs. 15 channels).
If you are experiencing silent rear surrounds on an X3800H layout, it is not a Dirac ART hardware limitation. Check your
Denon Amp Assign settings (the X3800H can only process 11 channels if you route 2 channels to an external amplifier), your physical speaker terminals, or ensure your source content isn't a fixed-print 7.1.2 mix that naturally leaves those channels vacant.
