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SQN-4S Series IVe User's Handbook
Contents
11 AUDIO LEVEL METERS
6 AUXILIARY MONITOR INPUTS
10 BASS CUTS
19 CONNECTOR LIST
17 CONNECTOR WIRING - 12 WAY
18 CONNECTOR WIRING - 10 WAY
5 CALIBRATION OF THE RECORDER
1 INTRODUCTION
8 LINE INPUTS
4 LINE-UP TONE
1. INTRODUCTION The basic information necessary to allow a recording engineer to operate the
SQN-4S audio mixer is permanently displayed on its baseplate and cannot be lost. The aim of these
instructions is to explain the mixer's facilities and functions in more detail to those who are already
familiar with the microphones and techniques that are employed by professional sound recordists.
Users of the earlier SQN mixers will naturally want to know in what respects the SERIES IVe differs
from the previous model. The new mixer again has four input channels and two main outputs. In
addition, access has been provided to the Post-Fader outputs of all of the channels so that it is
possible to feed four fader-controlled (unbalanced) outputs to an external recorder. Pre-fade listening
to all of the input channels is included, as is a 'slating' microphone. The power wiring allows the
fuse-protected feeding of external power to other equipment, controlled by the mixer's Power
Selector switch.
MIXING and MATRIXING. The SQN-4S SERIES IVe returns to a form of the control format
popularised by the earlier SQN-4S SERIES III mixers. In addition to the normal routing of individual
channels, the mixer can be configured as a Stereo Pair, with or without MS matrixing together with
two other pan-pottable channels. The modes of operation for the CH1/CH2 pair are selected by the
[GANG 1-2] switch:
1. TWIN MONO
2. STEREO
3. MID-SIDE (with matrixing to or from AB stereo)
The effects on the operation of the other controls of selecting these three modes are described in
section 14 below.
2. POWERING THE MIXER
1. INTERNAL BATTERY. The SQN-4S should be powered by Mallory Type MN 1500
or another manufacturer's equivalent AA size alkaline cells. The quiescent consumption
of the mixer is approximately 135mA at 12V and with dynamic microphones about 10
hours of continuous operation can be expected from fresh cells.
SQN-4S IVe User's Handbook
Page 1 of 10
9 MASTER GAIN CONTROL
7 MICROPHONES
14 MIXING AND MATRIXING
13 MONITORING HEADPHONES
12 OUTPUT LIMITERS
3 OUTPUTS
2 POWERING THE MIXER
15 SLATING MICROPHONE
16 WARRANTY & SERVICE
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Summary of Contents for SQN SQN-4S Series
- Page 1 Users of the earlier SQN mixers will naturally want to know in what respects the SERIES IVe differs from the previous model. The new mixer again has four input channels and two main outputs. In addition, access has been provided to the Post-Fader outputs of all of the channels so that it is possible to feed four fader-controlled (unbalanced) outputs to an external recorder.
- Page 2 In any case, when used in the SQN-4S they give a small fraction (about one fifth) of the life of alkaline cells, so they are a false economy. If such cells are fitted in an emergency, it is most important that they be removed immediately after use.
- Page 3 The basic calibration used at SQN is to place the Nominal Line Level at PPM4, ‘TEST’ or 0VU and then to treat the Nominal Peak Level as being 8dB above this, in the case of the PPM or VU meter or 6dB above in the case of the Nordic type of meter.
- Page 4 7. MICROPHONES The four identical XLR-3F microphone input connectors are wired to conform with the IEC standard (Pin 1 ground, Pin 2 in phase and positive for T-powering). The SQN-4S is designed to accommodate all professional microphones and assumes a source impedance for dynamic microphones in the range 150-600 Ohms.
- Page 5 The use of dynamic microphones may be more appropriate in these cases. Rotary faders were selected for the SQN-4S because of their inherently better environmental sealing and because they provide more mechanical movement in a small space than can a slider type. The specially designed control knobs incorporate some of the advantages of the slider in that they can be pushed from the side and their position is unequivocally seen and felt.
- Page 6 VU at +4dBm. Either calibration can be provided and will be noted on the mixer baseplate. 12. OUTPUT LIMITERS Location recording frequently puts the recording engineer in a situation in which he or she has no control over the ambient sound level. Accordingly, the SQN-4S has been Page 6 of 10...
- Page 7 Below the [PHONES] switch is a pair of three position toggle switches, sprung to their centre positions which control pre-fade listening to all of the input channels. 14. MIXING & MATRIXING CONTROLS The SQN-4S SERIES IVe mixer is intended to work in various modes and particularly to accomodate the use of Mid-Side microphones and Mid-Side recording.
- Page 8 SQN-4S IVe User's Handbook follows: 1. TWIN MONO with the [GANG 1-2] switch at [0]. The CH1/CH2 faders operate independently. The routing switches at the end of the mixer can direct the signals to either or both of the two mixing busses.
- Page 9 SQN-4S IVe User's Handbook 16. WARRANTY & SERVICE The SQN-4S is guaranteed for a period of 12 months from the date of purchase. This guarantee covers defects in manufacture, workmanship and materials and includes the cost of parts, labour and return carriage. The full terms of the guarantee are given in the printed copy of this document delivered with the mixer..
- Page 10 MIXER CONNECTOR MATING CONNECTOR MANUFACTURER MAIN I/O [A] (STANDARD) PRC05P12M Tajimi MAIN I/O [A] (SCREW) RM15PD10P Hirose SUBSIDIARY I/O [B] HR10-10P12P Hirose POWER INPUT [DC] HR10A7P4P Hirose POWER THROUGH [PT] HR10A7P4P Hirose ©1999, 2001 SQN Electronics Ltd Page 10 of 10...
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