The ADASTRA 953.404AD A4 Dual Stereo PA Mixer-Amplifier is an all-in-one audio powerhouse, engineered for professional multi-zone installations such as bars, restaurants, and function venues.
It delivers independent stereo playback across two separate zones, each selectable from multiple input sources - including USB, SD, Bluetooth, FM radio, or external line inputs.
With Class D efficiency, crystal-clear sound, and an intuitive control layout, it's the perfect blend of flexibility, reliability, and performance for modern commercial audio applications.

Key Features

• Dual-Zone Control - Independent stereo playback across 2 separate zones.
• Versatile Media Player - Supports USB, SD, Bluetooth, and FM tuner with external antenna connection.
• Comprehensive Mixing Section - Dual mic inputs with always-live output across both zones.
• Selectable Source Inputs - Choose between Line 1, Line 2, Aux (3.5 mm), or internal media player for each zone.
• High Output Power - 4×200 W RMS @ 4 , capable of driving up to 8 speakers simultaneously.
• Smart Protection Circuitry - Includes thermal, over-current, over-voltage, and short-circuit protection.
• Installer-Friendly Design - Compact 2U rackmount chassis ideal for professional audio racks.

Technical Specifications

• Power Supply: 230 V AC, 50 Hz (IEC)
• Fuse: F5A, 250 V
• Amplifier Type: Class D
• Output Power (RMS):
  4 × 200 W @ 4
  4 × 100 W @ 8
• Frequency Response: 20 Hz - 20 kHz ( 0.5 dB)
• Dynamic Range: 92 dB
• THD + N: < 0.1%
• Microphone Inputs: 2 × 6.3 mm jack (mono)
• Line Inputs:
  Line 1: L + R (6.3 mm jack / RCA)
  Line 2: L + R (RCA)
• Auxiliary Input: 3.5 mm stereo jack
• Input Sensitivity:
  Line: 0.775 Vrms
  Aux: 0.480 Vrms
• Input Impedance:
  20 k (balanced)
  10 k (unbalanced)
• Audio Sources: USB/SD MP3 player, FM tuner, Bluetooth receiver
• Bluetooth Version: 2.3
• Output Controls: 2 × Source Select, 2 × Bass, 2 × Treble, CH 1 - CH 4 level controls
• Line Output: 4 × RCA
• Speaker Outputs: 4 mm binding posts (4 channels)
• Antenna Connection: F-Type (FM tuner)
• Protection: Thermal, over-current, over-voltage, short-circuit
• Dimensions (W × D × H): 482 × 240 × 88 mm
• Weight: 5.98 kg

Applications

• Commercial Venues - Bars, restaurants, and function spaces requiring multi-zone control.
• Public Address Systems - Dual-zone amplification for paging and background music.
• Installations - Ideal for fixed audio setups in retail, corporate, or leisure environments.

What's in the box
1 × ADASTRA 953.404AD A4 Dual Stereo PA Mixer-Amplifier
1 × Power Cable
1 × User Manual