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Allen & Heath PA28 Stereo Mixer

Product Code ALPA282/X
Manufacturer Allen & Heath

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The PA20 is a robust, compact 20 input (16 mono, 2 dual stereo) mixer with a straightforward layout and extensive functionality. With a design and build quality that mirrors our professional touring desks, PA20 is an essential addition to any band, school, theatre, or hire inventory.


  • 24 mono MIC/LINE channels
  • 2 dual stereo LINE channels
  • AB outputs assignable from L, R, L+R, FB1 and FB2
  • Semi-parametric output EQ for more accurate frequency control
  • 4 Band channel EQ with swept high mid and 250Hz low mid
  • Built-in stereo digital effects with external summing and MIDI control
  • SPDIF digital audio output
  • Dual stereo channels for summed or 4 independent inputs
  • Post-LR BGM (background music) operating modes
  • Switchable sub bass filter on mono output
  • Individual +48V phantom power switching
  • 100mm faders, mutes and inserts throughout

Easy-to-Mix Controls

The control surface is laid out in an uncomplicated format and the operator can easily see all connections for patching. Pre-fade sends (FB) and post-fade sends (FX) are clearly labelled and colour coded, and there are generous 100mm fader masters with a LED mute button, identical to the channel controls. There is a selection of 16 digital FX to complete the professional design.


2 dual stereo channels with RCA and TRS connectors and independent gain controls are included for FX returns and stereo sources, such as CD players and backing tracks. The RCA inputs can feed straight to LR, so providing extra returns. The stereo channels are furnished with 2 band EQ, and can be routed to all 4 auxiliary sends.

A+B Output Channels

The main XLR outputs derive their source from a selectable combination of LR (stereo), L+R (mono), FB1 and FB2, and provide master level trim, meters, slave outputs, patch point for external processors, and the very precise 4 band semi-parametric equalisers. This is extremely flexible and means that the PA can be operated in many different ways. For example, the user may want to run a stereo house system with separate left and right speakers and no monitors, or a mono system with a foldback monitor.

High Performance Preamp

The mic preamp is probably the most important stage in the console's signal path and its performance is often the measure of the quality of the console. The PA Series uses a high grade dualstage design, developed from our acclaimed ML and GL consoles. This ensures optimum matching and very low noise when connecting mic or line sources.

Parametric Output EQ

A 4 band equaliser with swept frequency on each band provides more precise optimisation of the speaker system and control of feedback than the typical fixed frequency graphic type EQ found on similar consoles.


Each mono input channel is equipped with a 100Hz high-pass filter, an invaluable tool for cleaning up the mix. The majority of live sound sources have very little content below 100Hz, and modern microphones have wide frequency response and can pick up bleed from nearby low frequency sources such as bass and kick drums. The filter can be used: on vocal channels to reduce mic handling noise and close proximity ‘popping'; on drum overhead mics to reduce kick and bass pick up; on higher frequency instruments such as flute and acoustic guitar; and on stage mics to reduce foot noise.

Recording Outputs

There is a digital SPDIF 2-track output available from a RCA phono socket for recording direct to digital media, such as PC soundcards, DAT and digital audio processors. The recording send can be switched pre-fade if desired. An analogue recording output is also available.

4 Band Channel EQ

The 4 band input EQ is every bit a pro tool. The low [60Hz] and high [12kHz] bands have shelving response, while the high-midrange band is sweepable from 350Hz to 6 kHz. Low-midrange EQ has a bell response at 250Hz - a frequency chosen to provide reduction of ‘muddy' sounds and enhance ‘warmth'.

Lamp socket

A 4 pin lamp connector is provided on the rear of the control surface.


Max output level XLR +23dBu into >600ohm load
TRS +21dBu into >2k load
Nominal output level 0dBu (0.775 Volts rms
Headroom +21dB
Freq response +/-1dB 20Hz to 30kHz
Distortion < 0.006% THD+N @1kHz +10dBu

<-90dB Channel to channel @1kHz
<-95dB Mute shutoff
<-95dB Fader shutoff

MIC EIN 22-22kHz -128dB 150 ohm source
Residual noise <-88dBu
Mix noise <-84dBu
Meters Peak reading 12 LED
-30 to +16dB
Channel Peak 5dB before clipping
Channel HPF 100Hz 12dB/octave
Channel EQ 4-Band semi-parametric
HF bell 1k5 to 20kHz
HM bell 500 to 10kHz
LM bell 120 to 2kHz
LF bell 20 to 200Hz
Mono Sub LPF 100Hz 12dB/octave
Faders 100mm Alps
Digital Effects Stereo output
16 presets
MIDI Effects preset select
Effects bypass
Channel number = 1 (00H)

Power Supply

  Internal universal input switched mode power unit.
MAINS IN socket IEC 3 pin
Power lead Country dependent with moulded mains plug supplied
AC mains 100 to 240V AC @ 50/60Hz auto sensing
Consumption 75W max
Mains fuse rating 100-240V AC T1AL 250V 20mm (A&H part number: AL0305)

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