Meyer Sound UM-100P, UM-1P manual Hum or noise is produced by the speaker

4.Send the audio signal to another speaker to insure signal presence and that the level is within the proper range. Turn the source level down before reconnecting the audio input and increase the level slowly to avoid a sudden blast of sound.

5.Ifpossible,monitortheaudiosourcewithheadphones.

Hum or noise is produced by the speaker.

1.Disconnect the audio input. If the hum ceases, the noise originates somwhere earlier in the signal path. If the noise persists, the problem is within the UM-P. In this case return the unit to the factory or nearest authorized service center.

2.Make sure the XLR cable is securely fastened to the XLR audio input connector.

3.Send the audio signal to another speaker to insure signal presence and that the level is within the proper range. Turn the source level down before reconnecting the audio input and increase the level slowly to avoid a sudden blast of sound.

5.Hum or noise can be produced by a ground loop. Since the UM-P is effectively ground-lifted, this should not occur unless grounds are extremely different voltages.

The audio produced by the speaker is distorted or compressed but the limit light is not illuminated.

1.Make sure the XLR cable is securely fastened to the XLR audio input connector.

2.Send the audio signal to another speaker to insure that the level is within the proper range. Turn the source level down before reconnecting the audio input and increase the level slowly to avoid a sudden blast of sound.

3.Monitor the audio source with headphones.

The audio produced by the speaker is highly compressed and the limit light is constantly yellow.

1.Turn down the level of the input signal to the speaker system.

Only the high or low driver seems to pro- duce sound.

1.Make sure the audio signal is full-range and has not been filtered in a previous stage of the signal chain. If possible, monitor the audio source with high-quality headphones.

2.Send the audio signal to another speaker to insure that the signal is full-range. Turn the source level down before reconnecting the audio input and increase the level slowly to avoid a sudden blast of sound.

3.Use a sine wave and/or pink noise generator to send a variety of frequencies to the speaker.

There is some sound but the On/Temp. LED turns from green to red.

This occurs when the heatsink temperature reaches 85°C (185°F), indicating that the amplifier is thermally over- loaded. The limiter threshold has dropped to a safe level, so the audio level is probably reduced.

1.Make sure there is enough clearance above, below, and behind the unit.

2.Make sure there is sufficient air flow around the unit.

3.Avoid exposing the heatsink to direct sunlight if the ambient temperature is high.

4.If the ambient temperature is greater than 30°C and this condition occurs frequently, contact Meyer Sound to order the optional Fan Kit.

See the section Amplification, Limiting, and Cooling System on page 6 for a complete discussion about the cooling system.

There is no sound, the On/Temp. LED is dim or off, and the power supply fan is on high speed.

This extremely rare event occurs when the power supply overheats, causing a 1-2 minute interruption in operation. The unit turns on again when the power supply has cooled sufficiently.

1.Make sure there is at least six inches clearance behind the unit.

2.Make sure there is sufficient air flow around the unit.

3.Avoid exposing the unit to direct sunlight in high ambient temperature.

See the section Amplification, Limiting, and Cooling System on page 6 for a more information about the power supply’s internal fan and cooling system.

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