The Adastra A4 is a fully featured dual stereo PA amplifier designed for commercial installations such as bars, restaurants, and function rooms, delivering 4 x 200W across two independent stereo output zones.

Each output zone has its own source selector, bass, and treble controls, letting you tailor the audio independently for different areas of a venue. Microphone inputs 1 and 2 are live to both zones at all times, making announcements and background music easy to manage simultaneously.

The built-in media player supports USB and SD card playback of MP3 audio tracks, and a Bluetooth receiver is included for wireless streaming. A front-panel 3.5mm auxiliary input offers a quick connection for additional sources alongside the two rear stereo line inputs.

• Dual Zone Output: Two independent stereo zones, each with individual source selection, bass, and treble controls for flexible venue audio management.
• High Output Power: Delivers 4 x 100W at 8 Ohms or 4 x 200W at 4 Ohms, with speaker connections via 4mm binding posts on the rear panel.
• Built-in Media Player: Plays MP3 files directly from USB drive or SD card, removing the need for a separate source device.
• Bluetooth Receiver: Wireless audio streaming from smartphones or tablets straight to the amplifier.
• Dual Microphone Inputs: Two 6.3mm jack mic inputs with talkover functionality, both active across all zones simultaneously.
• Class D Amplification: Efficient Class D design with built-in thermal, over-current, over-voltage, and short-circuit protection for reliable long-term use.

Specifications

• Output Power (8 Ohms): 4 x 100W
• Output Power (4 Ohms): 4 x 200W
• Amplifier Class: Class D
• Frequency Response: 20Hz – 20kHz ±0.5dB
• Dynamic Range: 92dB
• THD+N: <0.1%
• Microphone Inputs: 2 × 6.3mm jack (mono)
• Line Inputs: Line 1: L+R (6.3mm jack / RCA), Line 2: L+R (RCA)
• Auxiliary Input: 3.5mm stereo jack
• Input Sensitivity (Line): 0.775Vrms
• Input Sensitivity (Aux): 0.480Vrms
• Input Impedance: 20k Ohms (balanced), 10k Ohms (unbalanced)
• Line Output: 4 × RCA
• Speaker Outputs: 4mm binding posts (4 channels)
• Audio Source: USB/SD MP3 playback, Bluetooth receiver
• Bluetooth Version: 2.3
• Antenna Connection: F-type (FM tuner)
• Protection: Thermal, over-current, over-voltage, short-circuit
• Power Supply: 230Vac, 50Hz (IEC)
• Fuse: T5A, 250V
• Dimensions (W × D × H): 482.0 × 260.0 × 88.0 mm
• Weight: 5.98 kg

What You Get

• 1 x Amplifier
• 1 x Power Lead
• 2 x Rack Ears
• 1 x Remote Control
• 1 x User Manual