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Adastra A4 PLUS Bluetooth Amplifier with 4 x 12" 300W PA Speakers & 400W Subwoofer

by Adastra
Original price £1,499.00 (inc. VAT) - Original price £1,499.00 (inc. VAT)
Original price £1,499.00 (inc. VAT)
£1,499.00 (inc. VAT)
£1,499.00 (inc. VAT) - £1,499.00 (inc. VAT)
Current price £1,499.00 (inc. VAT)
SKU 953.434-CASA12-SUB

This powerful Bluetooth music system is perfect for gyms and outdoor events that require a loud volume. It comes with the Adastra A4 PLUS, 4x 300W PA Speakers & 400W Subwoofer.

This kit is designed for areas that require great sound quality at a good level of volume, such as a gym or outdoor event (parties, sports days etc). The included subwoofer adds an extra level of deep bass which is perfect for dance music.

Included in this kit:

  • 1x Adastra A4 PLUS Amplifier
  • 4x Citronic CASA 12 PA Speakers
  • 1x Citronic CASA 12BA Subwoofer
  • 100m Speaker Cable
  • 4x Neutrik Speakon Connectors
  • 1x RCA - 6.35mm Jack Cable


The Adastra A4-PLUS expands upon the incredible success of the A4 - by far one of our most popular commercial amplifiers. It is specially designed for more demanding applications that need to run at a higher volume for longer periods of time, such as: 

  • Gyms and Fitness Studios
  • Late Night Bars & Pubs
  • Large Halls & Community Centres
  • Exhibitions & Conference Suites

The CASA 12 speakers can be wall mounted or positioned on a stand (optional) via the 35mm pole socket, and provides a locking Speakon connection ensuring the cable doesn't get accidentally ripped out.

The CASA 12BA subwoofer provides a very deep level of bass that normal speakers cannot achieve. There is a crossover setting on the back of the sub which will ensure a clean signal for the best possible sound quality. In conjunction with the PA speakers, this will make for a full-range sound perfect for parties, outdoor events and lively gym sessions.

This kit includes  100m of durable indoor/outdoor speaker cable, a connecting cable from the amp to the subwoofer and 4 Speakon connectors. 

Adastra A4-PLUS Key Features:

  • Bluetooth connectivity built-in 
  • Independent stereo playback to 2 separate zones
  • Media player with USB/SD playback
  • FM radio tuner with external aerial connection
  • 19" Rack mountable (ears supplied)
  • Microphone Inputs
  • RCA & 1/4" Jack Line Inputs

Citronic CASA 12 Key Features:

  • Custom high-efficiency drivers
  • High impact moulded cabinet with side and top handles
  • 35mm pole mount socket

Citronic CASA 12BA Subwoofer Key Features

  • Compact and lightweight design
  • Class-D Amplification - Ideal for low frequencies
  • 15mm MDF cabinets with hard-wearing paint finish
  • 2 x side carry handles
  • 35mm pole mount socket
  • L&R output link to connect to other speakers

Adastra A4 Mixer Amplifier Specifications

  • Power supply: 230Vac, 50Hz (IEC)
  • Power consumption max.: 360W
  • Fuse: F5A, 250V
  • Output power rms @ 4 Ohms: 4 x 200W
  • Output power rms @ 8 Ohms: 4 x 100W
  • Amplifier: construction: Class D
  • Frequency response: 20Hz - 20kHz ±0.5dB
  • Microphone inputs: 2 x 6.3mm jack (mono)
  • Line inputs: Line 1: L+R (6.3mm jack/RCA), Line 2: L+R (RCA)
  • Input sensitivity : line: 0.775Vrms
  • Auxiliary input: 3.5mm stereo jack
  • Input sensitivity : aux: 0.480Vrms
  • Input impedance: 20k Ohms (balanced), 10k Ohms (unbalanced)
  • Audio source: USB/SD mp3 playback, FM tuner, BT receiver
  • Input controls: Aux, Media, Line1, Line2, Mic1, Mic2, Talkover
  • Line output: 2 x RCA
  • Speaker outputs: 4mm binding posts (4 channels)
  • Antenna connection: F type (FM tuner)
  • Output controls: 2 x source select, 2 xBass, 2 xTreble, Ch1, Ch2, Ch3, Ch4
  • Dynamic range: 92dB
  • THD: +N <0.1%
  • Protection: Thermal, over-current, over-voltage, short-circuit
  • Dimensions: 482 x 240 x 88mm
  • Weight: 5.98kg

Citronic CASA 12 Specifications

  • Main driver: 3000mmØ (8")
  • Impedance: 8 Ohm
  • Voice coil: 75mmØ (2")
  • HF Driver: 35mmØ (1") Ti compression driver
  • Output power : rms: 300W
  • Output power : max.: 600W
  • Frequency response: 50 - 19kHz
  • Dimensions: 610 x 375 x 340mm
  • Weight: 11kg

Citronic CASA-12BA Active Subwoofer Specifications

  • Sub driver: 300mmØ (12")
  • Voice coil: 62mmØ (2.5")
  • Output power : rms: 400W
  • Output power : max.: 700W
  • Peak output: 1400W
  • SPL max.: 122.0dB
  • Frequency response: 55 - 150Hz
  • Dimensions: 480 x 450 x 380mm
  • Weight: 18.86kg

AudioKraft Apollo Series

  • CSA: 2 x 1.15mm²
  • Strands: 2 x (25 x 0.18mmØCu + 20 x 0.18mmØCCA)
  • Dimensions: 7.8mmØ
  • Current: 15A max.
  • Sheath: Black or White
  • Length: Per metre
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