The Allen & Heath ZED-28 is a 28-channel analog mixer offering versatile I/O and a user-friendly workflow for use in home and project studio recording, houses of worship, and live sound reinforcement. The 24 mono channels feature Neutrik XLR mic and 1/4″ line inputs, DuoPre preamps with phantom power and bountiful gain, 1/4″ insert points, and 4-band EQ with sweepable mids, while the two stereo channels have 1/4″ inputs and 4-band EQ with fixed mids. All channels are equipped with long-throw 100mm faders, solo and mute buttons, and independent aux send knobs.The six aux sends are ideal for routing to floor monitors and outboard time-based effects. A USB 1.1 port delivers 2-channel send and return capabilities via a Mac or Windows computer. There are stereo and mono main outputs in addition to four group outputs, two matrix outs, and two headphone outputs; multi-segment LED meters clearly indicate your group and main output levels. Patch additional stereo sources into the RCA stereo returns and 2-track input. The 2-track RCA output is handy for recording your mix to an external device such as a cassette deck or computer soundcard. The ZED-28 also boasts an external talkback mic input with an adjustable level and the ability to route the talkback signal to the first four aux’s or to all main outputs.24 Mono InputsThere are 24 mono input channels with Neutrik connectors¡ªXLR for balanced mic signals, and 1/4″ for balanced/unbalanced line-level sourcesTwo Stereo InputsThe two stereo input channels feature 1/4″ connectors to accommodate stereo devices such as keyboards, synth modules, and external effects processorsFlexible EQ SectionBased on the acclaimed GL2400 EQ, all mono channels feature 4-band EQ with sweepable midrange bands, while the stereo channels offer 4-band EQ with fixed frequencies on all bandsInsertsInserts on all mono channels, the group outputs, and the main outputs provide easy integration of analog outboard gear such as hardware compressors and equalizersDirect Outputs1/4″ direct outputs on all mono channels enable simple routing to a multi-track recorderIndependent Aux SendsSix auxiliary sends¡ªtwo pre-fader, two post-fader, and two switched pre- or post-fader¡ª with independent level controls allow versatile signal routing to cue mixes, floor monitors, and external effects processors4-Bus Group OutputsFour group outputs can be used for easy control of submixes, or for applying signal processing such as compression to groups of signals using the group insert connectorsUSB ConnectionA USB 1.1 port allows direct connection to Mac and Windows computers for stereo audio I/OFlexible OutputsThe ZED-428 offers balanced XLR main outputs (stereo and mono) with inserts, 1/4″ and 3.5mm stereo headphone outputs, and two matrix outputsIntegrated Talkback FacilitiesConnect an external mic to the XLR talkback mic input, then send it to the first four aux outputs or to all main outputsIn the BoxAllen & Heath ZED-428 28-Channel 4-Bus Analog Mixer with USB ConnectionUSB CablePower CableLimited 1-Year WarrantyUser Manual10.7 MBTable of ContentsDescription24 Mono InputsTwo Stereo InputsFlexible EQ SectionInsertsDirect OutputsIndependent Aux Sends4-Bus Group OutputsUSB ConnectionFlexible OutputsIntegrated Talkback FacilitiesAllen & Heath ZED-428 SpecsMixerNumber of Analog Input Channels28Number of Mic Preamps24Analog Output Channels1 x Stereo Master Output1 x Mono Master Output4 x Mono Bus/Subgroup Output6 x Mono Aux Send Output2 x Mono Matrix Output1 x Stereo Tape/Record Output1 x Stereo Headphone OutputFaders3.9″ / 100?mm Channel FaderMetersMain Meter:2 x 12-Segment LEDBus Meter:4-Segment LEDChannel Meter:2-Segment LEDSignal ProcessingGain/Trim RangeMic Input:-6 dB to +63 dB Line Input:-10 dB to +26 dB Stereo Input:-¡Þ to +10 dB Fader:-¡Þ to +10 dB Return:-¡Þ to +10 dB Aux:-¡Þ to +10 dB Matrix:-¡Þ to +6 dB EQ ParametersMono Channels:High: ¡À15 dB at 12 kHz (Shelving) Hi-Mid: ¡À15 dB at 500 Hz to 15 kHz (Notch/Peak) Lo-Mid: ¡À15 dB at 35 Hz to 1 kHz (Notch/Peak) Low: ¡À15 dB at 80 Hz (Shelving) Stereo Channels:High: ¡À15 dB at 12 kHz (Shelving) Hi-Mid: ¡À15 dB at 2.5 kHz (Notch/Peak) Lo-Mid: ¡À15 dB at 250 Hz (Notch/Peak) Low: ¡À15 dB at 80 Hz (Shelving) Mono Channels:High: ¡À15 dB at 12 kHz (Shelving) Hi-Mid: ¡À15 dB at 500 Hz to 15 kHz (Semi-Parametric) Lo-Mid: ¡À15 dB at 35 Hz to 1 kHz (Semi-Parametric) Low: ¡À15 dB at 80 Hz (Shelving) Stereo Channels:High: ¡À15 dB at 12 kHz (Shelving) Hi-Mid: ¡À15 dB at 2.5 kHz (Notch/Peak) Lo-Mid: ¡À15 dB at 250 Hz (Notch/Peak) Low: ¡À15 dB at 80 Hz (Shelving) FiltersHigh-Pass: 100 Hz, 12 dB/Octave Solo/MuteMute, PFL per Input ChannelMute, Solo-in-Place/AFL per BusMute per MasterBuilt-In EffectsNoneDigital AudioSample Rates32 / 44.1 / 48 kHzBit Depth16-BitPerformanceHeadroomAnalog: +21 dBUSB I/O: +14 dBFrequency ResponseMic 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 LevelMic Input:+17 dBu Line Input:+30 dBu (Mono) Insert Return:+21 dBu Output LevelXLR Main Output:+4 dBu (Nominal) +27 dBu at Max Gain Group Output:+4 dBu (Nominal) +27 dBu at Max Gain Aux Output:-2 dBu (Nominal) +21 dBu at Max Gain Matrix Output:-2 dBu (Nominal) +21 dBu at Max Gain Insert Send:-2 dBu (Nominal) +21 dBu at Max Gain Tape/Record Output:0 dBu (Nominal) +21 dBu at Max Gain Direct Output:0 dBu (Nominal) +21 dBu at Max Gain EIN-127 dBu at Max Gain (150-Ohm Input)Noise FloorMain Output:-89 dB (24 Channels Routed, Ref +4 dBu, 22 Hz to 22 kHz) -85 dBu (24 Channels Routed, Ref +4 dBu, 22 Hz to 22 kHz) THD+NMic 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) ConnectivityAnalog Inputs1 x Stereo RCA Coaxial 2-Track Input1 x XLR 3-Pin Balanced Talkback Input2 x Stereo RCA Coaxial Unbalanced Aux/Line Input24 x 1/4″ TRS Unbalanced Channel Insert4 x 1/4″ TRS Unbalanced Subgroup Insert2 x 1/4″ TRS Unbalanced Stereo Main Insert1 x 1/4″ TRS Unbalanced Main Insert24 x XLR 3-Pin Balanced Mic Input24 x 1/4″ TRS Balanced/Unbalanced Line Input4 x 1/4″ TRS Balanced/Unbalanced Line Input (2 Stereo Pairs)Analog Outputs1 x 1/4″ TRS Headphone Output1 x 1/8″ / 3.5 mm TRS Headphone Output1 x Stereo RCA Coaxial Unbalanced 2-Track Output24 x 1/4″ TRS Balanced Direct Output3 x XLR 3-Pin Balanced Main Output4 x 1/4″ TRS Balanced Subgroup Output2 x 1/4″ TRS Balanced Matrix Output6 x 1/4″ TRS Balanced Mono Aux SendPhantom Power+48 V (Selectable on Individual Inputs)USB1 x USB Type-B (USB 1.1)USB I/O Capacity2 x Input / 2 x OutputPowerAC Input Power100 to 240 VAC, 50 / 60 Hz Power Consumption60 W (Maximum)PhysicalRack MountableNoDimensions36.6 x 5.1 x 22.1″ / 93 x 12.9 x 56?cmWeight40?lb / 18.1?kgPackaging InfoPackage Weight62 lbBox Dimensions (LxWxH)42 x 22 x 10.8″Allen & Heath ZED-428
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