Adastra A4300 Commercial Mixer Amplifier 4 × 300W

The Adastra A4300 is a two-zone commercial mixer amplifier for background music and announcements in restaurants, bars, shops, cafés and leisure facilities. Four channels of Class D amplification deliver 300W RMS per channel at 4 ohms or 150W RMS per channel at 8 ohms, providing flexible power for compatible passive speaker installations.

Its two stereo zones allow separate source selection and sound adjustment, making it a practical choice for businesses with two areas to manage. A café could keep music quieter near its ordering counter, for example, while maintaining a different listening level in the seating area.

Separate control for two audio zones

Each zone provides bass and treble adjustment alongside output volume controls, helping you balance the sound for different rooms, speaker positions and activities. This is useful where one area needs unobtrusive background music while another requires more prominent playback.

Selectable stereo or summed dual mono operation accommodates different speaker layouts. Stereo suits spaces where listeners can hear both channels together. Dual mono combines the left and right signals, helping customers hear the complete musical mix when speakers are spread across a larger area.

Built-in music playback and versatile connections

Bluetooth connectivity, USB and microSD MP3 playback, and an FM tuner provide several ways to supply everyday music. The integrated player reduces the need for separate playback equipment, with an infrared remote included for convenient player control.

Two stereo RCA line inputs and a 3.5mm auxiliary input accommodate external audio sources. A TOSLink optical S/PDIF input also supports compatible digital AV equipment, making the A4300 a useful option for venues incorporating television or other digital audio into their sound system.

Microphone priority and commercial installation features

Two microphone inputs with individual level controls support spoken announcements. Selectable voice override gives microphone audio priority over the stereo line input, helping announcements stand out during music playback.

The 2U rack format keeps amplification, playback and mixing together in an equipment rack. Rear-panel 24V emergency mute contacts allow muting from a compatible alarm panel, while multiple protection circuits cover thermal, over-current, over-voltage and short-circuit conditions.

Features

• Four-channel Class D commercial mixer amplifier.
• Two stereo zones with separate source selection.
• Output power at 4 ohms: 2 × 2 × 300W RMS.
• Output power at 8 ohms: 2 × 2 × 150W RMS.
• Selectable stereo or summed dual mono operation per zone.
• Independent zone bass and treble controls with channel volume adjustment.
• Integrated Bluetooth receiver.
• USB and microSD playback for MP3 audio files.
• FM radio tuner with F-type external aerial connection.
• Two stereo RCA line inputs.
• 3.5mm stereo auxiliary input.
• TOSLink optical S/PDIF digital audio input.
• Two 6.3mm mono microphone inputs, with front or rear connection options.
• Individual microphone level controls and selectable talkover.
• Input controls for Aux, Media, Line 1, Line 2, Mic 1 and Mic 2.
• Rear-panel 24V emergency mute terminals.
• Frequency response: 20Hz–20kHz, ±0.5dB.
• Dynamic range: 92dB.
• Total harmonic distortion plus noise: below 0.1%.
• Line input sensitivity: 0.775V RMS.
• Auxiliary input sensitivity: 0.480V RMS.
• Input impedance: 10k ohms.
• Thermal, over-current, over-voltage and short-circuit protection.
• Power supply: 230V AC, 50Hz via IEC.
• 2U rack format.
• Includes infrared media-player remote and IEC power lead.
• Dimensions: 482 × 290 × 88mm.
• Weight: 7.06kg.

FAQs

Q: Does the A4300 provide four separate stereo zones?
A: No. Its four amplifier channels are arranged as two stereo zones, each with source selection and sound controls.

Q: Can I use different audio sources in the two zones?
A: Yes. Each zone can select from the available sources, allowing an external player to serve one area while the internal player supplies another.