ALLEN PA28 Details
PA28 28 input Stereo Live Mixer
The PA28 mixer has been designed with all the tools you will need to run a standard stereo PA system. With ALLEN&HEATH's legendary innovative design and excellent sound quality, these entry level consoles makes an ideal live mixer for club performers, schools' systems, conference rooms and travelling musicians. If you care about quality you'll also appreciate the build standards that the PA series conforms to, including the same individual vertical circuit boards, nutted pots and solid copper buss interconnection as our acclaimed ML series consoles. As for audio performance, PA28 mixers have the wonderfully full, open, natural quality that you'd expect from a professional ALLEN&HEATH desk.
Mono Inputs
24 mono channels with Mic [XLR] & Line [TRS] inputs. Line input overrides the XLR input. Individual +48V phantom power switches are provided. New padless two-stage preamp with smooth gain law. Line input goes to second stage for better matching and performance. Switched 100Hz high pass filter. Insert point. 4 band EQ. 4 aux mixes. Mute with LED. PFL button with LED [functions as peak indicator]. 100mm fader.
4 Band EQ
Shelving LF [60Hz], and HF [12kHz]. Fixed LM [250Hz], and swept HM [300Hz - 6kHz]. The fixed 250Hz control has been carefully selected to provide reduction of ‘muddy’ sounds and enhance ‘warmth’
Dual Stereo Channels
Four stereo channels with two unbalanced stereo inputs on each. One is RCA one is TRS jack. Independent gain controls provide source mixing in the channel strip. The top inputs [RCA] can be switched direct to L&R instead of the channel strip providing extra returns. Two band shelving EQ. 4 aux mixes. Stereo balance, mute with LED, PFL with LED, and 100mm fader as mono channels.
4 Auxiliary Sends
From all channels: 2 pre-fade for foldback mixes - these have 100mm fader masters, mute switch with LED, AFL with LED, and TRS outputs [can be routed internally to output section]. 1 post-fade aux mix for FX - this feeds the internal FX and has a TRS jack output for external FX. 1 post-fade aux mix to TRS jack output is provided for external FX or special feeds.
Mix Outputs
Main stereo mix output has 100mm fader control & mute with LED. TRS jack outputs. Mono sum output with level control with switch for subwoofer mode to TRS jack. Record output [RCA] analogue + SPDIF switchable pre/post fader. Twin 12 segment LED bar meter shows program [or PFL /AFL]. Insert points on TRS jack for external processing. Output EQ and routing to internal amplifiers / external systems is provided.
Output EQ
4 band semi-parametric EQ is provided in the output section, this affects the TRS slave outputs, and the internal constant power amplifiers. This offers more control than graphic equalisers for precise management of speakers, especially foldback / monitors. Source selector allows output EQ section to be used on Left / right, L&R sum / foldback1, or foldback1 / foldback2.
Digital FX
16 program digital FX processor provides reverbs, delays, chorus and others, inc combined. This FX module takes its feed from the post-fade FX aux on the mono & stereo channels. The output of the FX module is controlled by a 100mm fader with mute & PFL and is routed to the stereo mix and FB1&2 with post fade level controls. At this point, 2 TRS inputs with level control provide a way of combining external FX with the internal unit. Internal FX unit can be switched off to use external only if preferred. A footswitch TRS jack is provided to mute the FX channel. Editing of FX can be done via MIDI using ALLEN&HEATH software editor available free from resource CD or click here (zip file)
Master Section
Background music BGM mode - plays 2 track input into the main mix post fader, allows user to pull down fader (whilst patching, taking a break, or during walk-in) and leave music playing through the amplifiers / speakers. 2 track input [RCA] with level control to L&R - feeds headphone monitor selector [checking recording]. Twin, 3 colour 12 segment LED meter displays active monitor source. Large LED indicates PFL / AFL active - signal overrides L&R / 2TRK monitor source selection. Standby switch uses relays to disconnect the speakers. 2 track output [RCA] analogue + SPDIF allows direct to digital recording. Switchable pre / post master L&R fader. Mono sum out with level [TRS] - mode switch to provide sub feed with 100Hz low pass filter. Phones out [TRS] with level.
PSU
Solid & reliable internal PSU. 1600W design.
Lamp
4-pin XLR socket
Mechanical Spec
Width Height Depth Weight
PA28 941 mm (37”) 178 mm (7.0”) 539 mm (21.2”) 21 kg (46 lbs)
ALLEN PA28 Specs
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
Crosstalk <-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
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)
Mechanical
Mounting Portable with carry handle, freestanding desk or floor
Removable plastic side trims and extruded aluminium armrest
19” rack ears provided with PA12
Rack ears mount in two positions - straight 10U, angled 11U
Panels Controls 10 degrees, top connectors, rear mains, lamp and XLR outputs
Width Height Depth Weight
PA12 (desk) 525 mm (20.6”) 178 mm (7.0”) 539 mm (21.2”) 13 kg (28 lbs)
PA12 (rack) 484 mm (19.0”) 446 mm (17.6”) 178 mm (7”) 13 kg (28 lbs)
PA20 733 mm (28.9”) 178 mm (7.0”) 53 9 mm (21.2”) 17 kg (37 lbs)
PA28 941 mm (37”) 178 mm (7.0”) 53 9 mm (21.2”) 21 kg (46 lbs)
Connector Types
XLR connector : Pin 2 = hot (+) Pin 3 = cold (-) Pin 1 = GND
TRS input and output connectors : Tip = hot (+) Ring = cold (-) Sleeve = GND
RCA phono : Pin = signal Sleeve = GND
Input Connections Type Impedance Sensitivity
Mono MIC IN Balanced XLR female 2k ohm -63 to +5dBu
Mono LINE IN Balanced TRS jack >30k ohm -25 to +10dBu
ST1,3 LINE IN L,R Unbalanced RCA phono >10k ohm -10dBu max
ST2,4 LINE IN L,R Unbalanced TRS jack >10k ohm -10dBu max
2-TRK IN L,R Unbalanced RCA phono >10k ohm 0dBu
EXT FX IN L,R Unbalanced TRS jack >10k ohm 0dBu
Output Connections Type Impedance Level
A, B MAIN OUT Electronically balanced XLR <75 ohm 0dBu
L, R, MONO, Impedance balanced TRS jack <75 ohm 0dBu
A, B SLAVE OUT Impedance balanced TRS jack <75 ohm 0dBu
FB1, FB2, AUX, FX OUT Impedance balanced TRS jack <75 ohm 0dBu
2TRK OUT Unbalanced RCA phono <75 ohm 0dBu
2TRK OUT (SPDIF) RCA phono 75 ohm coax digital
HEADPHONES Tip = L Ring = R 30 to 600 ohm, 100 ohms recommended
Insert Connections Type Level
Channel, LR Unbalanced TRS tip = send, ring = return 0dBu
Allen & Heath PA28 28 Input Mixer
Connectors
Master_Selection
Rear
Stereo_Channels
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