Audio Fix / setup help
S.M.S.L SU-9 Pro: pair from the ordinary Bluetooth input state
S.M.S.L SU-9 Pro — pair from the ordinary Bluetooth input state. Use the stated exact hardware and connection scope.
Manufacturer-documented Reviewed 2026-11-09 · Revision 1
Follow these checks in Audio Fix →When this guide applies
Exact S.M.S.L SU-9 Pro. SU-9 Pro has no active audio connection and is available for ordinary Bluetooth pairing. The intended nearby source has not been confused with another SU-9 variant, and downstream amplification has independent safe level control.
Connection scope: Bluetooth. Symptom: My devices won’t pair or reconnect.
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 scope. Follow the link that matches what you actually observe. Alternative branches are not a single sequence of actions.
scope
Confirm the model and connection
SU-9 Pro has no active audio connection and is available for ordinary Bluetooth pairing. The intended nearby source has not been confused with another SU-9 variant, and downstream amplification has independent safe level control.
Look for: Confirm this exact setup and observation before continuing.
- If Yes, I confirm → Accept changing to Bluetooth media?
- If No / my setup differs → Continue with source and model support
- If I cannot confirm → More information is required
- Manufacturer-documented S.M.S.L SU-9 Pro — official manual ↗English pages 14–19: remote, Bluetooth, outputs, PRE, SOUND COLOR, DPLL and brightness — SU-9 Pro is a line DAC, not headphone amp. INPUTS selects USB/BT/optical, OUTPUT selectsAll/Balanced/Unbalanced. PRE VARIABLE controls volume, FIXED ignores it. SOUND COLOR Standard bypasses effects; DPL Llarger improves input tolerance. Bluetooth long press clears pairing, excluded; menu INPUTS permits ordinary BT selection.Exact S.M.S.L SU-9 Pro. · Source checked 2026-11-09
pair-consent
Accept changing to Bluetooth media?
Selecting BT interrupts any other active input. Continue only outside calls/recordings with agreement to pause media and mute downstream amplification first. No saved pairings are cleared.
Look for: Explicit informed acceptance is required before the next action.
- If I accept these effects → Pause old media
- If No / leave this unchanged → Continue with source and model support
- If I cannot confirm → More information is required
- Manufacturer-documented S.M.S.L SU-9 Pro — official manual ↗English pages 14–19: remote, Bluetooth, outputs, PRE, SOUND COLOR, DPLL and brightness — SU-9 Pro is a line DAC, not headphone amp. INPUTS selects USB/BT/optical, OUTPUT selectsAll/Balanced/Unbalanced. PRE VARIABLE controls volume, FIXED ignores it. SOUND COLOR Standard bypasses effects; DPL Llarger improves input tolerance. Bluetooth long press clears pairing, excluded; menu INPUTS permits ordinary BT selection.Exact S.M.S.L SU-9 Pro. · Source checked 2026-11-09
a1
Pause old media
Pause current media and mute downstream amplification at its own minimum control.
Look for: Observe the named indication or available control; stop if absent.
- If I completed this check → Select BLUETOOTH in INPUTS
- If I cannot complete this → Continue with source and model support
- If I cannot determine this → More information is required
- Manufacturer-documented S.M.S.L SU-9 Pro — official manual ↗English pages 14–19: remote, Bluetooth, outputs, PRE, SOUND COLOR, DPLL and brightness — SU-9 Pro is a line DAC, not headphone amp. INPUTS selects USB/BT/optical, OUTPUT selectsAll/Balanced/Unbalanced. PRE VARIABLE controls volume, FIXED ignores it. SOUND COLOR Standard bypasses effects; DPL Llarger improves input tolerance. Bluetooth long press clears pairing, excluded; menu INPUTS permits ordinary BT selection.Exact S.M.S.L SU-9 Pro. · Source checked 2026-11-09
a2
Select BLUETOOTH in INPUTS
Use the settings INPUTS menu to select BLUETOOTH. Do not long-press Bluetooth because the manual says that clears pairing.
Look for: Observe the named indication or available control; stop if absent.
- If I completed this check → Select the exact advertised model
- If I cannot complete this → Continue with source and model support
- If I cannot determine this → More information is required
- Manufacturer-documented S.M.S.L SU-9 Pro — official manual ↗English pages 14–19: remote, Bluetooth, outputs, PRE, SOUND COLOR, DPLL and brightness — SU-9 Pro is a line DAC, not headphone amp. INPUTS selects USB/BT/optical, OUTPUT selectsAll/Balanced/Unbalanced. PRE VARIABLE controls volume, FIXED ignores it. SOUND COLOR Standard bypasses effects; DPL Llarger improves input tolerance. Bluetooth long press clears pairing, excluded; menu INPUTS permits ordinary BT selection.Exact S.M.S.L SU-9 Pro. · Source checked 2026-11-09
a3
Select the exact advertised model
On the intended nearby source find SMSL SU-9 PRO and choose it. If absent, stop rather than clearing records or borrowing another SU-9 variant procedure.
Look for: Observe the named indication or available control; stop if absent.
- If I completed this check → Observe connected state
- If I cannot complete this → Continue with source and model support
- If I cannot determine this → More information is required
- Manufacturer-documented S.M.S.L SU-9 Pro — official manual ↗English pages 14–19: remote, Bluetooth, outputs, PRE, SOUND COLOR, DPLL and brightness — SU-9 Pro is a line DAC, not headphone amp. INPUTS selects USB/BT/optical, OUTPUT selectsAll/Balanced/Unbalanced. PRE VARIABLE controls volume, FIXED ignores it. SOUND COLOR Standard bypasses effects; DPL Llarger improves input tolerance. Bluetooth long press clears pairing, excluded; menu INPUTS permits ordinary BT selection.Exact S.M.S.L SU-9 Pro. · Source checked 2026-11-09
a4
Observe connected state
Confirm the source reports SMSL SU-9 PRO connected before quiet media under downstream volume control.
Look for: Observe the named indication or available control; stop if absent.
- If I completed this check → Check the result
- If I cannot complete this → Continue with source and model support
- If I cannot determine this → More information is required
- Manufacturer-documented S.M.S.L SU-9 Pro — official manual ↗English pages 14–19: remote, Bluetooth, outputs, PRE, SOUND COLOR, DPLL and brightness — SU-9 Pro is a line DAC, not headphone amp. INPUTS selects USB/BT/optical, OUTPUT selectsAll/Balanced/Unbalanced. PRE VARIABLE controls volume, FIXED ignores it. SOUND COLOR Standard bypasses effects; DPL Llarger improves input tolerance. Bluetooth long press clears pairing, excluded; menu INPUTS permits ordinary BT selection.Exact S.M.S.L SU-9 Pro. · Source checked 2026-11-09
observe
Check the result
Does the intended source report this exact SU-9 Pro connected?
Look for: Confirm this exact setup and observation before continuing.
- If Yes, I confirm → Checks completed
- If No / my setup differs → Continue with source and model support
- If I cannot confirm → More information is required
- Manufacturer-documented S.M.S.L SU-9 Pro — official manual ↗English pages 14–19: remote, Bluetooth, outputs, PRE, SOUND COLOR, DPLL and brightness — SU-9 Pro is a line DAC, not headphone amp. INPUTS selects USB/BT/optical, OUTPUT selectsAll/Balanced/Unbalanced. PRE VARIABLE controls volume, FIXED ignores it. SOUND COLOR Standard bypasses effects; DPL Llarger improves input tolerance. Bluetooth long press clears pairing, excluded; menu INPUTS permits ordinary BT selection.Exact S.M.S.L SU-9 Pro. · Source checked 2026-11-09
Possible result
More information is required
An unknown state is not a diagnosis. Record the last visible indication and consult the exact model instructions.
insufficient data
Reaching this result does not mean the issue is solved. Only your own feedback can report improvement.
Possible result
Continue with source and model support
Keep the source, connection and last observation. Do not reset, open equipment or change full-scale output to compensate for an unconfirmed result.
next support
Reaching this result does not mean the issue is solved. Only your own feedback can report improvement.
Possible result
Checks completed
The requested observation was confirmed in this setup. It does not establish a hardware repair or guarantee another source behaves the same.
steps completed
Reaching this result does not mean the issue is solved. Only your own feedback can report improvement.