Allen & Heath ZED-428 Specs

Total # Of Inputs 28
Mic/Line Inputs 24 x 3-Pin XLR Female Mic Inputs (Balanced)
24 x 1/4″ TRS Line Inputs (Balanced/Unbalanced)
Stereo Line Inputs 4 x 1/4″ TRS Line Inputs (Two Stereo Pairs, Balanced/Unbalanced)
In-Line Inputs/Returns No
Aux Sends 6 x 1/4″ TRS Mono (Balanced)
Aux Returns 4 x RCA Coaxial Line Inputs (Two Stereo Pairs, Unbalanced)
Inserts 24 x 1/4″ TRS on Mono Channels (Unbalanced)
4 x 1/4″ TRS on Group Buses (Unbalanced)
2 x 1/4″ TRS on Stereo Main Bus (Unbalanced)
1 x 1/4″ TRS on Mono Main Bus (Unbalanced)
Channel Direct Out 24 x 1/4″ TRS (Balanced)
BUS (Group) Outputs 4 x 1/4″ TRS Group Outputs (Balanced)
2 x 1/4″ TRS Matrix Outputs (Balanced)
Main Outputs 3 x 3-Pin XLR Male (One Stereo Pair and One Mono, Balanced)
Monitor Outputs 1 x 1/4″ TRS Stereo Headphone Output (Unbalanced)
1 x 1/8″ / 3.5 mm TRS Stereo Headphone Output (Unbalanced)
2-Track I/O 2 x RCA Coaxial 2-Track Input (One Stereo Pair, Unbalanced)
2 x RCA Coaxial 2-Track Output (One Stereo Pair, Unbalanced)
ALT I/O 1 x USB Type-B (2-Channel Send/Return)
Talkback Mic Input 1 x 3-Pin XLR Female (Balanced)
EQ Section High (All Channels): ±15 dB Shelving Filter at 12 kHz
High-Mid (Mono Channels): ±15 dB Peaking Filter at Selectable Frequency (500 Hz to 15 kHz, Sweepable)
High-Mid (Stereo Channels): ±15 dB Peaking Filter at 2.5 kHz
Low-Mid (Mono Channels): ±15 dB Peaking Filter at Selectable Frequency (35 Hz to 1 kHz, Sweepable)
Low-Mid (Stereo Channels): ±15 dB Peaking Filter at 250 Hz
Low (All Channels): ±15 dB Shelving Filter at 80 Hz
High-Pass Filter 12 dB/Octave at 100 Hz, Switchable
Solo/Mute Mute and PFL Solo
Channel Level Control 100mm Fader
Trim/Gain Control Rotary Control
Gain Range Mic Inputs: -6 to +63 dB
Line Inputs: -10 to +26 dB
Stereo Inputs: -∞ to +10 dB
Faders: -∞ to +10 dB
Returns: -∞ to +10 dB
Aux Masters: -∞ to +10 dB
Matrix Levels: -∞ to +6 dB
Phantom Power +48 VDC, Selectable per Channel
Metering Dual 12-Segment LEDs
4-Segment LED per Group Output
4-Segment LED per Main Output
Signal LED per Channel
Peak LED per Channel
USB Specification USB 1.1 Compliant
Bit Depth USB: 16-Bit
Sample Rates USB: 32 kHz, 44.1 kHz, or 48 kHz
Nominal Input Level Mic Input: -63 to +6 dBu
Mono Line Input: -26 to +10 dBu
Stereo Line Input: 0 dBu (+10 dB with Control Off)
Insert Point: 0 dBu
Maximum Input Level Mic Input: +17 dBu
Mono Line Input: +30 dBu
Insert Point: +21 dBu
Nominal Output Level XLR Main Outputs: +4 dBu
Group Outputs: +4 dBu
Aux Outputs: -2 dBu
Matrix Outputs: -2 dBu
Inserts: -2 dBu
2-Track Output: 0 dBu
Direct Output: 0 dBu
Maximum Output Level XLR Main Outputs: +27 dBu
Group Outputs: +27 dBu
Aux Outputs: +21 dBu
Matrix Outputs: +21 dBu
Inserts: +21 dBu
2-Track Output: +21 dBu
Direct Output: +21 dBu
Frequency Response Mic In to Main Out (30 dB Gain): 20 Hz to 20 kHz (+0.5 dB, -1 dB)
Line In to Main Out (0 dB Gain): 10 Hz to 30 kHz (+0.5 dB, -1 dB)
Stereo In to Main Out: 10 Hz to 30 kHz (+0.5 dB, -1 dB)
THD + N Mic In to Main Out (0 dB Gain, 1 kHz, +10 dBu Out): 0.004%
Mic In to Main Out (30 dB Gain, 1 kHz): 0.014%
Line In to Main Out (0 dB Gain, 1 kHz, 0 dBu): 0.005%
Stereo In to Main Out (0 dB Gain, 1 kHz, +10 dBu): 0.003%
Headroom Analog Headroom from Nominal (0 VU): 21 dB
USB In and Out Headroom from Nomimal (0 VU): 14 dB
Noise Mic Pre EIN: -127 dBu (Maximum Gain, 150-Ohm Input, 22 Hz to 22 kHz)
Mix Noise: -89 dB (-85 dBu) (L/R Out, 24 Channels Routed, Ref +4 dBu, 22 Hz to 22 kHz)
Power Consumption 60 W Maximum
Power Requirements 100 to 240 VAC, 47 to 63 Hz
Dimensions (W x H x D) 36.6 x 5.1 x 22.1″ / 93.0 x 12.9 x 56.0 cm
Weight 40 lb / 18.1 kg