beyerdynamic MMX 300 PRO — Decision Profile

Evidence Profile · L2 · documentation + editorial inference

beyerdynamic MMX 300 PRO

beyerdynamic MMX 300 PRO: Analogue PC/console voice and audio in a closed headset with replaceable wear parts.

Evidence checked / updated: 2026-10-12. Manufacturer claims and editorial system-fit assessment. No SoundPath Lab listening or measurement test.

Verified documentation

  • Design: Closed dynamic analogue gaming headset; 48 Ω
  • Sensitivity: 96 dB SPL at 1 mW / 500 Hz
  • Bandwidth: Headphones 5 Hz–40 kHz, microphone 20 Hz–20 kHz; tolerance unspecified
  • Weight: 314 g without cable
  • Cable: 2.5 m detachable headset cable: separate 3.5 mm headphone and mic plugs, supplied combination-jack adapter
  • Microphone: Cardioid back-electret, 2–9 V bias, 0.6 mA, 21.6 mV/Pa at 1 kHz; do not apply 48 V phantom

Best for

Analogue PC/console voice and audio in a closed headset with replaceable wear parts.

Avoid if

Not a USB DAC, wireless headset or XLR studio microphone.

Limits and unknowns

Closed acoustics do not prove gaming localization, speech clarity or comfort in an SPL test. Inline cable control and the model-page generic Remote field differ; verify the supplied cable.

Current verdict

Analogue PC/console voice and audio in a closed headset with replaceable wear parts.

Why it fits

Host needs headphone audio and a compatible microphone-bias input; use the supplied adapter for a supported combination jack. A USB-only computer needs an appropriate audio interface.

What it can replace

Can fill this role, subject to the stated conditions: Analogue PC/console voice and audio in a closed headset with replaceable wear parts.

What it cannot replace

Not a USB DAC, wireless headset or XLR studio microphone.

What SoundPath Lab tested

SoundPath Lab reviewed the listed exact-model primary documents and source discrepancies. No device was independently auditioned, measured, stress-tested or firmware-retested.

What remains untested

Actual sonic balance, distortion/output under load, room/ear fit, latency, long-term reliability and host-specific behaviour remain untested. Closed acoustics do not prove gaming localization, speech clarity or comfort in an SPL test. Inline cable control and the model-page generic Remote field differ; verify the supplied cable.

System conditions

Host needs headphone audio and a compatible microphone-bias input; use the supplied adapter for a supported combination jack. A USB-only computer needs an appropriate audio interface.

Alternatives by need

Compare MMX 330 PRO for the opposite open/closed choice; a standalone DT 700 PRO X needs a separate microphone.

Keep or upgrade

Keep a working system that already meets this use case. Upgrade only if the documented feature or connection solves the specific limitation: Closed acoustics do not prove gaming localization, speech clarity or comfort in an SPL test. Inline cable control and the model-page generic Remote field differ; verify the supplied cable.

When to reassess

Reassess on a verified hardware/document revision, material support or compatibility change, unresolved-source clarification, or accepted independent test. No arbitrary calendar delay or lifetime guarantee.

Ownership evidence

No new six-month ownership evidence was added; existing owner and issue records remain unchanged.

Firmware, manual and support

Passive analogue audio path; no user firmware or companion application is required for the documented audio connection. Use the exact model and revision when ordering replacement parts. Current local stock, authorized sales, launch/shipping dates and transaction price are not established by this documentation review. Existing dated price evidence remains historical. Warranty territory, exclusions, battery/consumable terms, repair availability and long-term support must be checked with the applicable official policy; no universal support end date is inferred.

Current local stock, authorized sales, launch/shipping dates and transaction price are not established by this documentation review. Existing dated price evidence remains historical. Warranty territory, exclusions, battery/consumable terms, repair availability and long-term support must be checked with the applicable official policy; no universal support end date is inferred.

Official model manual

Unresolved source conflicts

  • Specific cable documentation describes inline controls while the generic product table says Without Remote; no Bluetooth remote feature is inferred.

Primary sources

Revision record

2026-10-12 — Promoted from L1 to L2 after model-level evidence review. Stable product identity retained; source conflicts and untested behavior remain visible. L2 is evidence coverage, not independent test acceptance or automatic recommendation.

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