Use only if: VRROOM has failed or is offline for service ·
Fallback chain: Sources → Hue Sync Box 8K → Denon X3800H → Samsung S95F ·
Time: about forty-five minutes ·
Reversible: yes — see Section 4
⚠ Do not follow this procedure unless the VRROOM has failed or is offline for service.
The primary chain is VRROOM-in. The VRROOM 8K enables Dolby Vision (LLDV→HDR10 conversion via EDID Bank 10), lossless audio extraction to the Denon, and Hue Sync Box 8K passthrough. This fallback removes all three of those benefits:
No Dolby Vision. Fallback chain delivers HDR10 only — no LLDV elicitation, no per-scene dynamic metadata on Kaleidescape content.
No VRROOM audio extraction. Audio path reverts to Denon HDMI decode from Hue Sync Box 8K output; lossless Atmos preserved but VRROOM's AUDIO CAPS routing is gone.
Hue Sync accuracy degrades. Sync Box reads HDMI signal from sources directly rather than downstream of VRROOM processing; color sync may shift on DV-mastered content.
When the VRROOM is repaired or back online, follow Section 4 — VRROOM Restoration to return to the primary chain.
Video still works on every source via direct Sources → Hue Sync Box 8K → Denon → S95F topology.
Lossless Atmos / TrueHD / DTS-HD MA preserved — Denon decodes the original bitstream on HDMI input. No eARC on this path.
Hue Sync preserved — Hue Sync Box 8K remains in chain between sources and Denon.
Dolby Vision lost for duration of fallback — Strato V must output HDR10 (not Auto) to avoid blank handshake.
Chain comparison
Primary chain (VRROOM in) — goal state
VRROOM converts LLDV→HDR10 for S95F. Sync Box 8K passes video to TV; eARC returns audio to Denon. Full Dolby Vision pipeline active.
Fallback chain (VRROOM offline) — this procedure
VRROOM bypassed. Sources feed Sync Box 8K directly. Denon receives lossless audio from Sync Box output. No LLDV — Strato V must be set to HDR10 output for this chain.
Phase 1 — Cable plan
Phase 1
Cable plan
about fifteen minutes · before any settings change
Every cable in the fallback video path must be HDMI Forum Ultra High Speed certified (the official label, not just "HDMI 2.1" branding). Uncertified cables routinely fail at 48 Gbps. Use sub-ten-foot passive copper.
From
To
Spec
Strato V HDMI out
Hue Sync Box 8K HDMI input 1
UHS 48 Gbps
Apple TV 4K HDMI out
Hue Sync Box 8K HDMI input 2
UHS 48 Gbps
PS5 Pro HDMI out
Hue Sync Box 8K HDMI input 3
UHS 48 Gbps
Switch 2 dock HDMI out
Hue Sync Box 8K HDMI input 4
UHS 48 Gbps
Hue Sync Box 8K HDMI out
Denon HDMI input (label "SyncBox")
UHS · highest-bandwidth leg
Denon HDMI Main Out 1
S95F One Connect HDMI 1
UHS 48 Gbps
All four Hue Sync Box 8K inputs are equivalent. Any port assignment works — all four are identical HDMI 2.1b / 48 Gbps / HDCP 2.3. Port-specific routing was a 4K model limitation only.
Phase 2 — Per-device settings
Phase 2
Per-device settings
about twenty minutes · tap a device to expand its checklist
Denon AVR-X3800H · CEC anchor + HDMI format
The Denon now sits mid-chain. HDMI Format on the Sync Box 8K input must be 8K Enhanced or it caps at 10.2 Gbps and blocks 4K/120 and full HDR.
Hue Sync Box 8K · firmware + power + HDMI compat
Three settings resolve nearly every documented Sync Box 8K failure. Enhanced HDMI Compatibility lives in the Philips Sync app, not the main Hue app.
Samsung S95F · port labels + HDR acceptance
HDMI 1 receives Denon output. Device Name must NOT be "PC" on HDMI 1 — PC label suppresses HDR on that port. HDMI 3 (direct PC path) stays labeled "PC" as required for 4:4:4 chroma.
Kaleidescape Strato V · HDR10 output for fallback — FALLBACK ONLY
In the primary chain, Strato V HDR Output = Auto so the VRROOM EDID Bank 10 elicits LLDV. In the fallback chain, VRROOM is gone — Auto will try to send LLDV to Hue Sync Box 8K, which cannot accept it. Set HDR10 explicitly for this fallback. Revert to Auto when restoring VRROOM (Section 4).
FALLBACK ONLY — revert to Auto when VRROOM is restored. HDR10 here sacrifices Dolby Vision for working video. Section 4 restoration steps include reverting this setting.
Switch 2 · dock settings
Match TV Power State = Off prevents power-off cascade: if S95F powers down, Switch 2 does not cascade off. This is the correct canonical setting per CR-08.
Apple TV 4K · one-tap wake settings
Sleep After = Never prevents Apple TV sleep from cascading into Sync Box 8K handshake collapse.
PS5 Pro · CEC + audio settings
Phase 3 — Smoke tests
Phase 3
Smoke tests
about ten minutes · run each test, confirm before moving on
S95F powers on (CEC from Denon), Denon front display shows Sync Box 8K input label.
Apple TV one-tap wake
From idle (TV off, Denon off), tap any button on the Siri Remote.
S95F powers on, Denon powers on and switches to Sync Box 8K input, Apple TV interface appears within ~5 seconds. Siri Remote volume adjusts Denon.
Strato V HDR10 picture (key fallback test)
Wake Strato V, navigate Library → play a 4K HDR title, watch splash → playback transition.
Continuous HDR10 picture. No black screen on format change. S95F status bar shows HDR10.
Apple TV format switch
Play a 24-fps title. Match Frame Rate triggers refresh-rate change from 60 Hz to 24 Hz.
Brief HDCP renegotiation, then continuous playback. No persistent black screen.
Atmos audio verification
Play an Atmos-encoded title (Apple TV, Strato V, or PS5 Pro).
Denon front display shows Dolby Atmos or TrueHD Atmos. NOT 2.0 L-PCM.
Hue Sync active
Enable Hue Sync in the Philips Hue Sync app while content is playing.
Hue lights in Entertainment Area respond to on-screen color. Sync Box 8K LED pulses with sync activity.
Half-hour idle soak
Leave system on with Apple TV idle for a long break.
No spontaneous power-offs. Hue Sync Box 8K LED solid. Switch 2 (if docked) still responsive.
Section 4 — VRROOM Restoration
Restoring the primary chain when VRROOM returns
about thirty minutes · run after VRROOM repair or return from service
Returns the system to: Sources → VRROOM 8K → Hue Sync Box 8K → S95F HDMI 1 (NON-DV) → eARC → Denon AVR-X3800H. Complete all steps in order.
Troubleshooting
Black screen on Strato V format change during fallback
Cause: Strato V HDR Output not set to HDR10 (fallback requires HDR10, not Auto). Fix: Browser interface → Advanced → HDR Output = HDR10. Power-cycle Strato V.
Audio drops to 2.0 L-PCM on Atmos content
Cause: Denon HDMI Format on Hue Sync Box 8K input set to Standard. Fix: Setup → Video → HDMI Format Setting → [Sync Box input] → 8K Enhanced. Power-cycle Denon.
Switch 2 randomly powers off mid-session
Cause: Match TV Power State = On creates cascade from S95F standby events. Fix: System Settings → TV Settings → Match TV Power State = Off (canonical per CR-08). You lose dock-to-wake but gain stability.
Siri Remote volume doesn't control Denon
Cause: Apple TV CEC re-pairing needed after rack changes. Fix: Apple TV → Settings → Remotes and Devices → Volume Control → HDMI (not Auto). If still failing, "Learn New Device" + point Siri Remote at Denon.
Hue Sync stops responding
Fix: Power off source via remote, power-cycle Hue Sync Box 8K via Philips Hue Sync app (Settings → Restart), power-cycle S95F (full off), power on S95F → Hue Sync Box 8K → source in that order.
After VRROOM restoration, Strato V still outputs HDR10 (no DV)
Cause: HDR Output not reverted to Auto (Section 4 step 6 missed). Fix: Browser interface → Advanced → HDR Output = Auto. Power-cycle Strato V. Confirm VRROOM DV tab shows active Dolby Vision.
Key restoration check: After restoring the VRROOM, verify HDR/AVI Max Luminance = 1,000 nits (not 4,000). The 4,000-nit value was live as of 2026-05-12 and causes CMv2.9 brightness-boost on compatible discs. Correct it as part of every VRROOM restoration.
Sources
Audit matrix: home_theater_one_shot_20260512_AUDIT_html_conflict_matrix.md — CR-01 through CR-12, MIG-REWRITE action
Agent A live-site audit: home_theater_one_shot_20260512_AGENT_A_live_site_state.md — topology confirmation, migration.html stale state
Agent D VRROOM reference: home_theater_one_shot_20260512_AGENT_D_vrroom_complete_reference.md — EDID Bank 10, HDR/AVI Max Luminance 4,000 nits live misconfiguration, FW 0.62
Agent G unresolved research: home_theater_one_shot_20260512_AGENT_G_unresolved_research.md — Strato V bandwidth 18 Gbps, FW 0.63 nonexistent, HDR Output = Auto for LLDV elicitation
CR-08: Switch 2 Match TV Power State = Off (canonical) · CR-09: Strato V HDR Output = Auto primary / HDR10 fallback only
CR-11: Hue Sync Box 8K all four inputs identical HDMI 2.1b / 48 Gbps / HDCP 2.3