Description
The Allen & Heath ZED-420 is a 20-channel, 4-bus analog mixer built for live sound, recording, and venue installations. It offers 16 mono mic/line channels, two stereo channels, and powerful 4-band EQ derived from the GL-series for precise tonal shaping. With six aux sends, four subgroups, and a 7×2 matrix, it provides flexible routing for monitors, effects, and complex mixes. The onboard USB interface enables easy stereo recording and playback with Mac or Windows systems. Long-throw 100mm faders and robust preamps deliver clean, controlled mixing for demanding environments. Additional features such as talkback, inserts, and extensive output options make it a versatile hub for professional audio workflows.


4-Band MusiQ EQ
The analogue MusiQ EQ is tuned for musicality: 4 bands with sweepable high/mid and low/mid frequencies. Its optimised Q factor delivers smooth, instrument-friendly equalisation for both studio tracking and on-stage sound shaping.


USB Stereo Routing
Its 2-in / 2-out USB interface supports variable send options — Main Mix L+R (pre- or post-fader), or Aux sends — plus a stereo USB return. This makes it ideal for live streaming, recording, or playback with easy, configurable monitoring.
- 16 mic/line channels with inserts
- 2 stereo channels
- 2 in / 2 out USB audio interface
- 6 aux sends (2x pre, 2x post, 2x pre/post)
- 4 sub groups
- XLR main outputs with insert points
- 4-band EQ with sweepable mid
- 7×2 matrix
- Durable 100mm faders
Number of Analog Input Channels: 20
Number of Mic Preamps: 16
Analog Output Channels:
1x Stereo Master Output
1x Mono Master Output
4x Mono Bus/Subgroup Output
6x Mono Aux Send Output
2x Mono Matrix Output
1x Stereo Tape/Record Output
1x Stereo Headphone Output
Mix Routing: Stereo Main Mix / Mono Aux Bus/Subgroup
Faders & Level Adjustment: 3.9” / 100 mm Channel Fader
Meters:
Main Meter: 2x 12-Segment LED
Bus Meter: 4-Segment LED
Channel Meter: 2-Segment LED
Gain/Trim Range:
Mic Input: -6 dB to +63 dB
Line Input: -10 dB to +26 dB
Stereo Input: -∞ to +10 dB
Fader: -∞ to +10 dB
Return: -∞ to +10 dB
Aux: -∞ to +10 dB
Matrix: -∞ to +6 dB
EQ: 4-Band EQ
EQ Parameters:
Mono Channels:
High: ±15 dB at 12 kHz (Shelving)
Hi-Mid: ±15 dB at 500 Hz to 15 kHz (Notch/Peak)
Lo-Mid: ±15 dB at 35 Hz to 1 kHz (Notch/Peak)
Low: ±15 dB at 80 Hz (Shelving)
Stereo Channels:
High: ±15 dB at 12 kHz (Shelving)
Hi-Mid: ±15 dB at 2.5 kHz (Notch/Peak)
Lo-Mid: ±15 dB at 250 Hz (Notch/Peak)
Low: ±15 dB at 80 Hz (Shelving)
Mono Channels:
High: ±15 dB at 12 kHz (Shelving)
Hi-Mid: ±15 dB at 500 Hz to 15 kHz (Semi-Parametric)
Lo-Mid: ±15 dB at 35 Hz to 1 kHz (Semi-Parametric)
Low: ±15 dB at 80 Hz (Shelving)
Stereo Channels:
High: ±15 dB at 12 kHz (Shelving)
Hi-Mid: ±15 dB at 2.5 kHz (Notch/Peak)
Lo-Mid: ±15 dB at 250 Hz (Notch/Peak)
Low: ±15 dB at 80 Hz (Shelving)
Filters: High-Pass: 100 Hz, 12 dB/Octave
Solo/Mute:
Mute, PFL per Input Channel
Solo-in-Place/AFL, Mute per Bus
Mute per Master
Sample Rates: 32 / 44.1 / 48 kHz
Bit Depth: 16-Bit
Frequency Response
Mic Input to Main Output: 20 Hz to 20 kHz +0.5/-1 dB (30 dB Gain)
Line Input to Main Output: 10 Hz to 30 kHz +0.5/-1 dB (Unity Gain)
Stereo Input to Main Output: 10 Hz to 30 kHz +0.5/-1 dB
Max Input Level:
Mic Input: +17 dBu
Line Input: +30 dBu (Mono)
Insert Return: +21 dBu
Noise Floor:
Main Output:
-90 dB (16 Channels Routed, Ref +4 dBu, 22 Hz to 22 kHz)
-86 dBu (16 Channels Routed, Ref +4 dBu, 22 Hz to 22 kHz)
THD+N:
Mic Input to Main Output: 0.004% at Unity Gain (+10 dBu, 1 kHz)
Mic Input to Main Output: 0.014% at +30 dB Gain (1 kHz)
Line Input to Main Output: 0.005% at Unity Gain (0 dBu, 1 kHz)
Stereo Line Input to Main Output: 0.003% at Unity Gain (+10 dBu, 1 kHz)
Analog Inputs:
1x Stereo RCA Coaxial 2-Track Input
1x XLR 3-Pin Balanced Talkback Input
16x 1/4″ TRS Unbalanced Channel Insert
4x 1/4″ TRS Unbalanced Subgroup Insert
2x 1/4″ TRS Unbalanced Stereo Main Insert
1x 1/4″ TRS Unbalanced Main Insert
16x XLR 3-Pin Balanced Mic Input
16x 1/4″ TRS Balanced/Unbalanced Line Input
2x Stereo RCA Coaxial Unbalanced Aux/Line Input
4x 1/4″ TRS Balanced/Unbalanced Line Input (2 Stereo Pairs)
Analog Outputs:
1x 1/4″ TRS Headphone Output
1x 1/8″ / 3.5 mm TRS Headphone Output
1x Stereo RCA Coaxial Unbalanced 2-Track Output
16x 1/4″ TRS Balanced Direct Output
3x XLR 3-Pin Balanced Main Output
4x 1/4″ TRS Balanced Subgroup Output
2x 1/4″ TRS Balanced Matrix Output
6x 1/4″ TRS Balanced Aux Send
Phantom Power: +48 V (Selectable on Individual Inputs)
USB I/O: 1x USB-B 1.1
USB I/O Capacity: 2x Input / 2x Output
OS Compatibility: Windows / macOS
AC Input Power: 100 to 240 VAC, 50 / 60 Hz
Dimensions: 28.2 x 5.1 x 22.1″ / 71.5 x 12.9 x 56 cm
Weight: 31 lb / 14.1 kg















