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Audio Mixer


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Item #:MO797419
Condition:Reference Item
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Model Description:
4:2 ENG Audio Mixer

Model Details

The SERIES IVe represents the latest development in the continuing programme to ensure that the SQN 4S remains at the forefront of location sound technology. This new design improves upon the original SERIES IV with a superb new limiter and other changes, while returning to a control layout which provides the operational simplicity of our earlier models.
The mixer includes all of the essential advances of its ancestor: all-electronic input amplifiers, large output transformers for low distortion bass, virtually unbreakable analogue level meters, pre-fade listening, slating microphone, logic processing of many switching functions leading to a minimal length audio path and optional feed for four output channels. Further advances include the new limiter, separate switching of the pre-fade listening, a low distortion tone oscillator and more convenient handling of high output powered microphones.
The essential information for connecting to and operating the mixer is permanently printed on the baseplate.


Monitor Return Input
Balanced inputs with a range of sensitivity from -20dBu to +20dBu for loudness parity with the internal monitoring. The sensitivity is adjusted by a screwdriver preset on the base.
Mixing Bus Inputs
Two inputs directly into the summing amplifiers with their gain adjustable inside the mixer. Maximum sensitivity is 0dBu for +8dBu at the balanced outputs with the master gain set at 0.
Balanced Outputs
Two line driver amplifiers provide the output channels and each output is available on both an individual XLR and a combined Multi-way connector.
Output Attenuators
The level at either set of connectors can be attenuated by 50dB to provide a nominally microphone level feed.
Line Drivers
Floating sources (transformer coupled) with a clipping level of +20dBm into 600 Ohms. Distortion at the nominal peak level of +8dBm is less than 0.01% with a 600 Ohm load 20Hz to 20kHz. The output resistance is 60 Ohms.
The balanced Mic-Level sends are derived from separate windings on the output transformers. Their source impedance of 200 Ohms is essentially resistive .
Unbalanced Outputs
A SUBSIDIARY I/O connector carries separately buffered
outputs at a line level of -10dBu.
Post-Fader Outputs,
All Channels

The SUBSIDIARY I/O connector carries four buffered
outputs at a line level of -10dBu.
If an external link is made on the connector, the operation of the signal routing for channels three and four is changed so that they may be switched out of the mixing bus. Selecting PAN for CH3 or CH4 will now switch the channel out of the mix instead of to the PANpot. This is for the benefit of those who wish to extract the channels separately.
Twin peak reading, logarithmic level meters with Peak Programme Meter (PPM) dynamics. Scaling may be BBC PPM, Nordic Norm, or SMPTE.
meters can also be provided. The meters are normally calibrated with the mixer driving a bridging load of 10k Ohms. While the mixer is operating the meters are illuminated by low power light emitting diodes.
Line Output Level
The nominal line level is normally set at 0dBu for PPM metered mixers and +4dBu for VU metered mixers. Peak level, which is used as a reference for the limiters, is considered to be 8dB above this setting. Other calibration levels are readily available to order.

Mixer Inputs
Four transformerless balanced inputs using XLR-3 type female connectors. Channels one and two also share an XLR-5 type connector. Each channel is switchable for:
  1. Powering:
    • a)12V T (Din AB)
    • b)12V Phantom
    • c) 48V Phantom
    • d) Dynamic (150 to 600 Ohms)
  2. Attenuation:
    • 0dB, -10dB or -20dB
      An extra 10dB of attenuation is automatically introduced when mic powering is selected. This is achieved without compromising the noise performance of the microphone.
  3. Bass Cut:
    • Flat, -3dB at 75 or 105Hz
  4. Line Attenuation:
    • Adds 50dB attenuation before the mic preamp.

-78dBu for nominal line level (PPM4, 0VU) with the channel gain at maximum and the master gain at 0dB
Max Level, Mic Inputs
-20dBu (+4dBu with full attenuation)
Noise Figure
-130dBu (A weighted) from a 200 Ohm source.
Frequency Response
20Hz to 20kHz +0, -1dB, referred to 1kHz.
Isolation, channel to unrelated channel: 75dB at 1kHz, 60dB at 15kHz.
Channel Configuration
The mixer has four input channels, all of which have the same input selectors, bass cuts and attenuators. The routing arrangements for CH1 & 2 differ from those for CH3 & 4.
Channels 1 & 2
[GANG 1-2]

The operation of the CH1, CH2 pair is controlled by the GANG 1-2 switch on the front panel. This switch has three positions:
  1. Twin MONO [O] in which the channels are unganged and each input channel can be routed to either or both of the output channels.
  2. Stereo [S] ganging in which the Channel 1 fader controls the gain of both channels and a stereo balance control on the side panel comes into play.
  3. Mid-Side [MAT] ganging in which the Channel 1 fader controls the gain of both channels and the Channel 2 fader acts as an image width control. The incoming signal is assumed to be in MS format and is matrixed to AB. The stereo balance control remains active and will balance the matrixed signal.

Phase Switch
Channel 2 can have its phase inverted by means of a front panel switch. This has the incidental effect of interchanging left and right in an MS encoded signal.
Channels 3 & 4
The operation of the CH3, CH4 pair is much simpler than the CH1, CH2 pair. Each channel can be routed to LEFT, RIGHT or to a PANpot.

Additional Information


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