Audio Fix / setup help
Denon AVC-X4800H (EU), AVR-X3900H (NA) / AVR-X2900H (EU): apply a small manual correction when audio arrives before the picture
Known current HDMI input; early audio, not already late.
Manufacturer-documented Reviewed 2026-11-09 · Revision 2
Follow these checks in Audio Fix →When this guide applies
Denon AVR-X3900H (NA) / AVR-X2900H (EU). Known current HDMI input; early audio, not already late. Exact AVC-X4800H controls already documented in its existing guide; receiver return output is MONITOR 1 for AVC-X4800H and TV 1 for the two AVR models.
Connection scope: HDMI / ARC / eARC audio. Symptom: Sound and picture are out of sync.
This is a documented check, not a diagnosis of your equipment. The model name does not confirm the selected input, mode, software or connected partner.
If your exact model or a required setting is unknown, use the “I don’t know” branch below. Do not apply a similarly named model’s instructions.
Checks and possible outcomes
Start at step-0. Follow the link that matches what you actually observe. Alternative branches are not a single sequence of actions.
step-0
Does sound arrive before the matching picture movement?
Adding delay can worsen sound that is already late.
Look for: Confirm the actual prerequisite or observation. Stop safely if unknown.
- If Yes, confirmed → Is the intended current input identified, with no timing correction of another source desired?
- If No → Stop at the unconfirmed condition
- If I do not know / cannot check → A required fact is unknown
- Manufacturer-documented Adjusting audio delay (Audio Delay) AVC-X4800H ↗Adjusting audio delay (Audio Delay) — OPTION > Audio Delay > Adjust permits manual audio delay from0–500ms, saved per source. Auto Lip Sync requires a supporting TV and may not correct every TV.Manual correction of audio arriving before the picture; no assumed TV Auto Lip Sync support. · Source checked 2026-11-09
- Manufacturer-documented Denon AVR-X3900H official manual ↗PDF pages 1, 124 — OPTION Audio Delay Adjust provides 0–500 ms stored per input. Auto Lip Sync depends on TV capability and its value can be fine-adjusted; no automatic partner support is assumed.North American AVR-X3900H; do not apply to a differently named European receiver. Manual early-audio trial, no universal TV setting. · Source checked 2026-11-09
- Manufacturer-documented Denon AVR-X2900H official manual ↗PDF pages 1, 133 — OPTION Audio Delay Adjust provides 0–500 ms stored per input. Auto Lip Sync depends on TV capability and its value can be fine-adjusted; no automatic partner support is assumed.European AVR-X2900H / AVR-X2900H DAB shared manual; not an inferred X2800 generation. Manual early-audio trial, no universal TV setting. · Source checked 2026-11-09
step-1
Is the intended current input identified, with no timing correction of another source desired?
Each input stores its own value.
Look for: Confirm the actual prerequisite or observation. Stop safely if unknown.
- If Yes, confirmed → May its old Audio Delay value and Auto Lip Sync state be retained for a reversible comparison?
- If No → Stop at the unconfirmed condition
- If I do not know / cannot check → A required fact is unknown
- Manufacturer-documented Adjusting audio delay (Audio Delay) AVC-X4800H ↗Adjusting audio delay (Audio Delay) — OPTION > Audio Delay > Adjust permits manual audio delay from0–500ms, saved per source. Auto Lip Sync requires a supporting TV and may not correct every TV.Manual correction of audio arriving before the picture; no assumed TV Auto Lip Sync support. · Source checked 2026-11-09
- Manufacturer-documented Denon AVR-X3900H official manual ↗PDF pages 1, 124 — OPTION Audio Delay Adjust provides 0–500 ms stored per input. Auto Lip Sync depends on TV capability and its value can be fine-adjusted; no automatic partner support is assumed.North American AVR-X3900H; do not apply to a differently named European receiver. Manual early-audio trial, no universal TV setting. · Source checked 2026-11-09
- Manufacturer-documented Denon AVR-X2900H official manual ↗PDF pages 1, 133 — OPTION Audio Delay Adjust provides 0–500 ms stored per input. Auto Lip Sync depends on TV capability and its value can be fine-adjusted; no automatic partner support is assumed.European AVR-X2900H / AVR-X2900H DAB shared manual; not an inferred X2800 generation. Manual early-audio trial, no universal TV setting. · Source checked 2026-11-09
step-2
May its old Audio Delay value and Auto Lip Sync state be retained for a reversible comparison?
Do not assume the TV supports automatic compensation.
Look for: Confirm the actual prerequisite or observation. Stop safely if unknown.
- If Yes, confirmed → Open OPTION > Audio Delay for that current source
- If No → Stop at the unconfirmed condition
- If I do not know / cannot check → A required fact is unknown
- Manufacturer-documented Adjusting audio delay (Audio Delay) AVC-X4800H ↗Adjusting audio delay (Audio Delay) — OPTION > Audio Delay > Adjust permits manual audio delay from0–500ms, saved per source. Auto Lip Sync requires a supporting TV and may not correct every TV.Manual correction of audio arriving before the picture; no assumed TV Auto Lip Sync support. · Source checked 2026-11-09
- Manufacturer-documented Denon AVR-X3900H official manual ↗PDF pages 1, 124 — OPTION Audio Delay Adjust provides 0–500 ms stored per input. Auto Lip Sync depends on TV capability and its value can be fine-adjusted; no automatic partner support is assumed.North American AVR-X3900H; do not apply to a differently named European receiver. Manual early-audio trial, no universal TV setting. · Source checked 2026-11-09
- Manufacturer-documented Denon AVR-X2900H official manual ↗PDF pages 1, 133 — OPTION Audio Delay Adjust provides 0–500 ms stored per input. Auto Lip Sync depends on TV capability and its value can be fine-adjusted; no automatic partner support is assumed.European AVR-X2900H / AVR-X2900H DAB shared manual; not an inferred X2800 generation. Manual early-audio trial, no universal TV setting. · Source checked 2026-11-09
step-3
Open OPTION > Audio Delay for that current source
Leave the present automatic setting unchanged.
Look for: Perform only the stated operation, then confirm it was possible.
- If I completed this → Select Adjust and add a small delay within 0–500 ms
- If I could not do this → Stop at the unconfirmed condition
- If I do not know / cannot check → A required fact is unknown
- Manufacturer-documented Adjusting audio delay (Audio Delay) AVC-X4800H ↗Adjusting audio delay (Audio Delay) — OPTION > Audio Delay > Adjust permits manual audio delay from0–500ms, saved per source. Auto Lip Sync requires a supporting TV and may not correct every TV.Manual correction of audio arriving before the picture; no assumed TV Auto Lip Sync support. · Source checked 2026-11-09
- Manufacturer-documented Denon AVR-X3900H official manual ↗PDF pages 1, 124 — OPTION Audio Delay Adjust provides 0–500 ms stored per input. Auto Lip Sync depends on TV capability and its value can be fine-adjusted; no automatic partner support is assumed.North American AVR-X3900H; do not apply to a differently named European receiver. Manual early-audio trial, no universal TV setting. · Source checked 2026-11-09
- Manufacturer-documented Denon AVR-X2900H official manual ↗PDF pages 1, 133 — OPTION Audio Delay Adjust provides 0–500 ms stored per input. Auto Lip Sync depends on TV capability and its value can be fine-adjusted; no automatic partner support is assumed.European AVR-X2900H / AVR-X2900H DAB shared manual; not an inferred X2800 generation. Manual early-audio trial, no universal TV setting. · Source checked 2026-11-09
step-4
Select Adjust and add a small delay within 0–500 ms
Compare the same scene; restore the original value if worse.
Look for: Perform only the stated operation, then confirm it was possible.
- If I completed this → Is timing closer on that same scene?
- If I could not do this → Stop at the unconfirmed condition
- If I do not know / cannot check → A required fact is unknown
- Manufacturer-documented Adjusting audio delay (Audio Delay) AVC-X4800H ↗Adjusting audio delay (Audio Delay) — OPTION > Audio Delay > Adjust permits manual audio delay from0–500ms, saved per source. Auto Lip Sync requires a supporting TV and may not correct every TV.Manual correction of audio arriving before the picture; no assumed TV Auto Lip Sync support. · Source checked 2026-11-09
- Manufacturer-documented Denon AVR-X3900H official manual ↗PDF pages 1, 124 — OPTION Audio Delay Adjust provides 0–500 ms stored per input. Auto Lip Sync depends on TV capability and its value can be fine-adjusted; no automatic partner support is assumed.North American AVR-X3900H; do not apply to a differently named European receiver. Manual early-audio trial, no universal TV setting. · Source checked 2026-11-09
- Manufacturer-documented Denon AVR-X2900H official manual ↗PDF pages 1, 133 — OPTION Audio Delay Adjust provides 0–500 ms stored per input. Auto Lip Sync depends on TV capability and its value can be fine-adjusted; no automatic partner support is assumed.European AVR-X2900H / AVR-X2900H DAB shared manual; not an inferred X2800 generation. Manual early-audio trial, no universal TV setting. · Source checked 2026-11-09
step-5
Is timing closer on that same scene?
A changed delay number is not a measured synchronisation result.
Look for: Confirm the actual prerequisite or observation. Stop safely if unknown.
- If Yes, confirmed → Checks completed — report the actual result
- If No → Stop at the unconfirmed condition
- If I do not know / cannot check → A required fact is unknown
- Manufacturer-documented Adjusting audio delay (Audio Delay) AVC-X4800H ↗Adjusting audio delay (Audio Delay) — OPTION > Audio Delay > Adjust permits manual audio delay from0–500ms, saved per source. Auto Lip Sync requires a supporting TV and may not correct every TV.Manual correction of audio arriving before the picture; no assumed TV Auto Lip Sync support. · Source checked 2026-11-09
- Manufacturer-documented Denon AVR-X3900H official manual ↗PDF pages 1, 124 — OPTION Audio Delay Adjust provides 0–500 ms stored per input. Auto Lip Sync depends on TV capability and its value can be fine-adjusted; no automatic partner support is assumed.North American AVR-X3900H; do not apply to a differently named European receiver. Manual early-audio trial, no universal TV setting. · Source checked 2026-11-09
- Manufacturer-documented Denon AVR-X2900H official manual ↗PDF pages 1, 133 — OPTION Audio Delay Adjust provides 0–500 ms stored per input. Auto Lip Sync depends on TV capability and its value can be fine-adjusted; no automatic partner support is assumed.European AVR-X2900H / AVR-X2900H DAB shared manual; not an inferred X2800 generation. Manual early-audio trial, no universal TV setting. · Source checked 2026-11-09
Possible result
Checks completed — report the actual result
Completion does not automatically mean the problem is solved. Report what actually happened; no physical test or measured repair is claimed.
steps completed
Reaching this result does not mean the issue is solved. Only your own feedback can report improvement.
Possible result
Stop at the unconfirmed condition
A required setup or response was not confirmed. Retain the actual observation and consult the exact source/partner manual or official support. Do not escalate to a reset, update installation, internal repair or unsafe wiring change.
next support
Reaching this result does not mean the issue is solved. Only your own feedback can report improvement.
Possible result
A required fact is unknown
Confirm the actual model, connection, partner capability and state before continuing. Do not guess a menu, interrupt an installation or modify a live source by trial and error.
insufficient data
Reaching this result does not mean the issue is solved. Only your own feedback can report improvement.