Audio Fix / setup help
PreSonus Quantum ES 2: return the shared knob from headphone level to main-speaker control
PreSonus Quantum ES 2 — return the shared knob from headphone level to main-speaker control. Confirm the actual setup and observed response before reporting an outcome.
Manufacturer-documented Reviewed 2026-11-09 · Revision 1
Follow these checks in Audio Fix →When this guide applies
Knob green in persistent headphone-control mode, main-speaker control wanted.
Connection scope: Device controls / power only. Symptom: Buttons, touch controls or wear detection aren’t working.
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
Is the knob green while you are trying to control main speakers?
White controls input gain and blue already controls Main; do not infer another mode.
Look for: Confirm the stated setup or observation. Unknown stops safely.
- If Yes / confirmed → Do you want main-output control without changing the headphone level?
- If No / cannot confirm → Stop and retain the actual observations
- If I do not know / cannot check → A required fact is unknown
- Manufacturer-documented PreSonus Quantum ES 2 official manual ↗PDF pages 8, 9, 14 — ES 2 Headphone Control makes the knob green and does not time out. Main selects main-output control with a blue knob.Mode selection only; no ES 4 second headphone or speaker-switching control. · Source checked 2026-11-09
step-1
Do you want main-output control without changing the headphone level?
Selecting a control does not change its level automatically.
Look for: Confirm the stated setup or observation. Unknown stops safely.
- If Yes / confirmed → Press Main once
- If No / cannot confirm → Stop and retain the actual observations
- If I do not know / cannot check → A required fact is unknown
- Manufacturer-documented PreSonus Quantum ES 2 official manual ↗PDF pages 8, 9, 14 — ES 2 Headphone Control makes the knob green and does not time out. Main selects main-output control with a blue knob.Mode selection only; no ES 4 second headphone or speaker-switching control. · Source checked 2026-11-09
step-2
Press Main once
Do not rotate the knob or press 48 V.
Look for: Perform only the stated operation and confirm whether it was possible.
- If Yes / confirmed → Is the knob blue for main-output control?
- If No / cannot confirm → Stop and retain the actual observations
- If I do not know / cannot check → A required fact is unknown
- Manufacturer-documented PreSonus Quantum ES 2 official manual ↗PDF pages 8, 9, 14 — ES 2 Headphone Control makes the knob green and does not time out. Main selects main-output control with a blue knob.Mode selection only; no ES 4 second headphone or speaker-switching control. · Source checked 2026-11-09
step-3
Is the knob blue for main-output control?
If the indication differs, stop before adjusting listening levels.
Look for: Confirm the stated setup or observation. Unknown stops safely.
- If Yes / confirmed → Checks completed — report what happened
- If No / cannot confirm → Stop and retain the actual observations
- If I do not know / cannot check → A required fact is unknown
- Manufacturer-documented PreSonus Quantum ES 2 official manual ↗PDF pages 8, 9, 14 — ES 2 Headphone Control makes the knob green and does not time out. Main selects main-output control with a blue knob.Mode selection only; no ES 4 second headphone or speaker-switching control. · Source checked 2026-11-09
Possible result
Checks completed — report what happened
Completion is not an automatic solved result. Report your actual outcome; no Audio Review 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 and retain the actual observations
A required fact or response was not confirmed. Consult the exact product/partner documentation 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, source, partner capability and current state before continuing. Do not guess a menu or interrupt a live session/update.
insufficient data
Reaching this result does not mean the issue is solved. Only your own feedback can report improvement.