User Manual for Adastra UX120 and UX240 Mixer Amplifiers

Quick guide from the manual

The Adastra UX-series mixer amplifiers are designed for public address systems. Before operating, ensure the unit is placed in a well-ventilated area away from moisture. The amplifier supports either 100V line systems or 2Ω low impedance systems, but these configurations cannot be used simultaneously. Always ensure the total speaker load matches the amplifier's output capabilities.

Installation and Mounting

The UX-series amplifiers can be rack-mounted into a 19-inch cabinet using the supplied rack accessories. Two joining brackets can link a pair of amplifiers to form a full-width 1U rack-mount pair. Alternatively, the rack ears can be attached to mount the amplifier against a wall or under a counter, with the controls visible vertically.

Connections and Setup

Power: Connect the rear IEC inlet to the mains using the supplied lead.

Inputs: Connect a microphone to the rear XLR/jack input. Line-level audio can be connected via rear RCA sockets or the front 3.5mm AUX input.

100V Line Systems: Connect the "100V" output terminal to the positive (+) speaker connection and "COM" to the negative (-). Connect speakers in parallel. Ensure the combined wattage of speakers does not exceed 90% of the amplifier's power rating.

Low Impedance Systems: Connect the "2Ω" output to the positive (+) speaker connection and "COM" to the negative (-). Ensure the total speaker load is not lower than 2Ω.

Emergency Mute: The 24V Mute terminals can be connected to a fire or security panel to mute all inputs except the microphone when 24V is present.

Operation and Audio Player

The built-in audio player supports Bluetooth, USB (mp3/wma), and DAB/FM radio. Use the SOURCE button to cycle through modes. The front panel includes volume controls for MIC, AUX, PLAYER, and MASTER, as well as BASS and TREBLE EQ controls.

Settings Menu

Hold the SOURCE button to access global settings. Use the navigation buttons to adjust:

• Time: Set time/date, 12/24 hour format, and auto-update settings.
• Backlight: Adjust timeout and brightness levels.
• Language: Select display language.
• Factory Reset: Reset the audio player.
• SW version: View current software version.

Troubleshooting

If you encounter issues, check the following:

• No power: Check the IEC lead, mains switch, and inlet fuse.
• No output: Ensure volume controls are turned up and input signals are connected correctly.
• Bluetooth issues: Ensure the device is within 5-10m range and paired correctly.
• Distorted sound: Check that input levels are not too high and that Hi-Z line inputs are not connected to the MIC input.
• Overheating: Ensure low impedance speakers are not connected to 100V terminals and that the total load is not lower than 2Ω.

Specifications

Power Output: 120W (UX120) or 240W (UX240).Power Supply: 170-264Vac, 50Hz or 24Vdc.Inputs: 1x Mic (6.3mm), 1x Line (2x RCA), 1x Aux (3.5mm).Speaker Outputs: Screw terminals (100V / 2Ω / Com).Bluetooth: Version 5.0.