Audio
Meyer Sound 900-LFC troubleshooting
The Meyer Sound 900-LFC problems live-event techs bring to Ask Roadie most (also called 900 LFC). Pick your symptom, or describe your own in plain words, and get the likeliest fix first, with the manual page when there is one.
Common 900-LFC errors & problems
What techs run into most, and what's usually behind it. The step-by-step fix for your exact unit is in Ask Roadie.
- Step-by-step fixGet the fix →
Active/Status LED is flashing/pulsing red (hardware fault or overheating)
Likely cause: A flashing red LED is the units protection state.
- Step-by-step fixGet the fix →
Cardioid sub array is not rejecting energy behind it (bass spilling onstage / behind the array)
Likely cause: Reversed polarity plus the correct time offset makes the rear box cancel the front boxes rearward output while summing forward, producing the cardioid null behind the array.
- Step-by-step fixGet the fix →
LED is solid green but there is no low-end / no audio from the sub
Likely cause: A green LED only means the electronics are healthy - it does not confirm a valid audio feed.
- Step-by-step fixGet the fix →
Limit LED lights frequently or stays lit
Likely cause: The onboard limiters cap excursion and power; steady limiting means the input is hotter than the sub can cleanly reproduce, so reducing drive recovers dynamics and lowers thermal load.
- Step-by-step fixGet the fix →
Need to feed several 900-LFCs from one source
Likely cause: The Loop output is a parallel pass-through of the input, so one console send can drive a string of subs without a splitter; the 5-pin variant carries RMS alongside audio.
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On power-up the Active/Status LED does not turn solid green, or the sub outputs no audio after ~10 seconds
Likely cause: The 900-LFC is self-powered with an internal Class D amplifier; a green Active/Status LED confirms the power supply and amp came up cleanly.
- Step-by-step fixGet the fix →
Power distribution planning - how much current does a 900-LFC draw
Likely cause: These are Meyer published continuous current figures; using them prevents nuisance breaker trips and undersized distro when multiple self-powered subs share a circuit.
- Step-by-step fixGet the fix →
RMS / Compass shows no data for the sub (no remote monitoring)
Likely cause: RMS is a separate two-wire monitoring bus carried on pins 4/5 of the 5-pin XLR; without that path (or on a 3-pin cable) the box makes sound but is invisible to Compass RMS.
- Step-by-step fixGet the fix →
Sub is thermal-limiting / losing output during a long loud show
Likely cause: Thermal limiting is driven by sustained power dissipation and ambient heat; airflow and a modest level reduction keep the amp/driver below the protection threshold so output stays consistent.
Not on the list? Describe it your way, or paste the error code off the display. Ask Roadie works the problem with you until it's fixed or you have a clear next move.
How Ask Roadie helps with the 900-LFC
- 1. Pick the Meyer Sound 900-LFC. It's already in the list.
- 2. Describe what you're seeing. In your own words, or the error code off the screen.
- 3. Get the likeliest fix first. Steps in order, the manual page when there is one, and a note when other techs have confirmed it.
- 4. Still broken? Tap 👎 and it keeps going from where you left off.