Ensure the voltage selector at the rear panel matches your region's requirement before connecting the power cord.
| Symptom | Probable Cause | Fix | |---------|----------------|------| | No power, no LEDs | Blown fuse or bad IEC cable | Replace fuse (same rating: T10AL 250V, located next to power inlet). | | No sound, Signal LEDs off | Input cable or mixer output issue | Test with known good cable. Check mixer master volume. | | Sound cuts in/out | Overheating or loose Speakon | Check fans for dust. Allow cool-down. Tighten cables. | | Constant red Clip light | Input signal too hot | Turn down mixer output. Flip sensitivity switch to 1.4V. | | Hum / buzz | Ground loop | Flip GROUND LIFT switch (one channel at a time). | | Amp shuts down at high volume | Too low impedance (e.g., two 8Ω cabs in parallel = 4Ω) | Rewire speakers for higher impedance or reduce volume. | | Protection LED stays on | DC offset or shorted output | Disconnect speakers. Power cycle. If still lit, service needed. | gear one pa2400 user manual
3-band EQ per channel and Dual 7-band Graphic Equalizers for the master output. Ensure the voltage selector at the rear panel