Mono Input Channel:

• Direct Output Socket - The nominal level is 0dBu and the output is impedance balanced
• Microphone Input Socket - Standard 3-pin socket
• 48V Phantom Power Switch  - Applies +48V to pins 2 and 3 of the XLR input though 6k8 resistors for phantom powered condenser microphones
• Line Input Jack Socket - The line input overrides the Mic input,so if you want to hear something plugged in tothe XLR socket,make sure nothing is plugged into the Line input
• Insert Jack Socket- The insert point is after the 100Hz filter and before the EQ.
• Gain Control - This adjusts the gain of the input amplifier to match the signal level of the input.
• 100Hz Hi-pass Filter - The Hi-pass filter is used for reducing pop noise and rumble from microphone signals
• HF EQ - High Frequencyequaliser affects the frequency response of the higher audible frequencies.
• HMF EQ - High Mid Frequency equaliser affects the upper middle of the audible frequency range.
• LMF EQ - Lower Mid Frequency equaliser affects the lower middle of the audible frequency range.
• LF EQ- Low Frequency equaliser affects the response at the low end of the audio range.
• EQ IN - The EQ IN switch enables the equaliser when pushed in.The EQ is bypassed when the switch is in its up position
• AUXES 1 & 2 - Each of these controls sends a signal to an auxiliary bus.
• AUXES 3 & 4 - These are switched pre or post-fade so they can be used either monitor sends or effects sends.
• AUXES 5 & 6 - Sourced post fade,so that the level is set with the send control but will be affected by the fader position.

• PAN - The pan control adjusts how the signal from the mono input channel is  shared between the left and right buses and subsequently the main stereo outputs, similarly to pairs of Groups.

• Mute Switch -This mutes or cuts the signal to the buses and the Direct Out. A rectangular LED illuminates to show the Mute switch is pressed.

• PFL Switch - The PFL (Pre-Fade Listen) switch sends the channel signal to the PFL bus  and subsequently to the headphones and the main L R meters. Used for checking the audio signal before raising the fader or un-muting the channel

• Signal & PK! LED - The Signal LED illuminates dimly at a threshold of –16dB nominal level and  gets brighter with higher level signal. The source for the signal & peak LED’s is just after the EQ IN switch.

• Routing Switches - The routing switches connect the post-fade signal to the mix buses via the pan control for the main LR bus and the group buses. For minimum noise from the mix bus summing amplifier, leave the switches in their up positions if the channel signal is not required on the bus

• Fader - The 100mm fader affects the level of the channel signal to the left & right,  mono and group buses and Auxes 5 & 6. Also Auxes 3 & 4 if switched to post-fade. There is 10dB of gain at the top and the unity gain position is marked by “0”.

• ST 1 (&ST3) Phono Sockets - These are stereo inputs additional to the main stereo channel inputs
• Stereo Inputs 1 (&3) Level Control - Adjust the level the stereo inputs 1 & 3 from off to maximum where it has 10dB of gain.
• ST 1 (& 3 ) Routing selector Switch -  This switch selects whether the ST1 (or ST3) signal is sent to the L R bus directly, or the stereo channel below
• ST2 (& ST4) input jack sockets  - Standard 1/4” jack sockets for line level stereo signals. Can be used  with a mono input where the L/M input will also connect to the R  input if nothing is plugged in to R
• Stereo Input ST2 (& ST4) Level control  - Adjusts the level of the ST2 (& ST4) input. The range is from off to +10dB.
• Stereo Channel EQ - The EQ on the stereo channel is 4 band,fixed frequency and comprises a shelving high frequency section,a shelving low frequency section and two fixed mid frequency controls.
• EQ IN - The EQ IN switch enables the equaliser when pushed in. The  EQ is bypassed when the switch  is in its up position.
• Auxes 1 & 2 - Auxes 1 & 2 send a mono sum of the stereo channel left & right signals sourced from pre-fader.
• Auxes 3 & 4 - Again, a mono sum of the stereo channel left and right signals,the source being switchable pre or post fader.
• Auxes 5 & 6 - take their source from a mono sum of the stereo channel left and right signals after the fader
• Balance control  - The Balance control varies the relative levels between the left and right channels
• Mute Switch  - mutes the signals to the main L R, M and Group buses as well as the Aux sends.
• PFL Switch  - The PFL (Pre-Fade Listen) switch sends a mono sum of the stereo channel  channel signal to the PFL bus
• Signal & PK! LED  - The Signal LED illuminates dimly at a threshold of –16dB on either left or  right channels and gets brighter with higher level signal. The source for the  signal & peak LED’s is just after the EQ IN switch.
• Routing Switches  - routing switches connect the post-fade signal to the mix buses via the  balance control for L_R and the groups. For minimum noise from the mix  bus summing amplifier, leave the switches in their up positions if the channel  signal is not required on the bus
• Fader  - The 100mm fader affects the level of the channel signal to the left & right,  mono and group buses and Auxes 5 & 6. Also Auxes 3 & 4 if switched to  post-fade. There is 10dB of gain at the top and the unity gain position is  marked by “0”.

Matrix Outputs & AUX Masters

• Matrix Outputs - There are two matrix sub-mix sections in ZED-4.The send controls (black & red knobs) take the post-fade signals from the Group,Left,Right and Mono mix paths and send them to the Matrix output.Matrix outputs 1 & 2 are individual mono outputs.There is a master level control to adjust theoverall output level and an AFL switch to check the Matrix mix.

Auxiliary Output Master Level controls

• The Aux master level controls adjust the overall level of each of the Aux mixes 1 to 6. The range of control is from off (fully attenuated) to  +10dB. There is an AFL (after fade listen) switch on each Aux mix to check the signal after the master level control

Group Masters

• Group Fader -  The Group fader is fed with the Group mix signal via  the Group Insert point. The fader has 100mm of  travel and there is +10dB of gain at its maximum  position
• Group AFL  - The AFL switch allows monitoring of the Group signal after the fader but before the Mute switch
• Group Mute - The illuminated Mute switch cuts the Group signal from the Group output, sub routing and the Group meter
• Group Meter  - A 4 LED bar meter to show the level of signal on the Group output
• Group Pan - Controls how the group signal is shared between the left and right main mix buses when routed.
• Group Sub Routing - The L-R switch routes the panned group signal to the main LR mix and the M switch routes the unpanned group signal to the mono bus.