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Table of Contents
Related Manuals for SPL Channel One 2950
Summary of Contents for SPL Channel One 2950
- Page 1 Manual Channel One Model 2950 Channel Strip...
- Page 2 This document is the property of SPL and may not be copied or reproduced in any manner, in part or fully, without prior authorization by SPL.
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Page 3: Table Of Contents
Preamplifier MIC GAIN, 48 V, Activating phantom power, Phase reverse ..........11 High pass, INSTR./LINE GAIN, INSTR./LINE IN, INSTRUMENT, Gain adjustments ....12 De-Esser ON, S-REDUCTION, SPL De-Esser technology ..............13 Insert ..........................14 Compressor/Limiter ON, LIMIT ......................... 14 COMPRESSION, MAKE UP GAIN, NOISE GATE ..............15 SPL compressor technology ..................... -
Page 4: Symbols & Notes, Scope Of Delivery & Packaging
Attention: Do not attempt any alterations to this machine without the approval or supervision of SPL electronics GmbH. Doing so could nullify completely any and all of your warranty/guar- antee rights and claims to user support. Scope of Delivery & Packaging The scope of delivery comprises the Channel One, the external power supply, the guarantee card and this manual. -
Page 5: Hook Up
Important Security Information Lightning: Before thunderstorms or other severe weather, disconnect the machine from wall power (but to avoid life threatening lightning strikes, not during a storm). Similarly, before any severe weather, disconnect all the power connections of other machines and antenna and phone/network cables which may be interconnected so that no lightning damage or overload results from such secondary connections. -
Page 6: Introduction, Principles
With the Channel One we have produced a fully-featured channel strip which for the greater part is based on the processing concepts already known in other products, such as the SPL De-Esser and the DynaMaxx compressor. The very complex task of a channel strip profits particularly from the innovative techniques that have always allowed the operation of SPL equipment to be efficient and objective. -
Page 7: Wiring
Rear Panel Wiring Channel One... -
Page 8: Sockets And Switches
Rear Panel Sockets and switches Signal connection Switch off the unit before you begin the process of making the first or any subsequent connec- tions. Neglecting this can damage either or both your ears and your equipment. 1/4" TRS sockets The TRS sockets LINE IN, INSERT SEND/RETURN, OUTPUTS und AD INPUT 2 support both balanced (1/4"... - Page 9 Rear Panel Sockets and switches VOLTAGE 230V ~50Hz Fuse: 315mA slow The rear panel VOLTAGE SELECTOR sets the local line voltage (115 V position: 110-120 volts/6o Hz, 230 V position: 220-240 volts/50 Hz). The diagram to the right shows the correct 115V ~60Hz switch position for 230 V power supply.
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Page 10: Power
Rear Panel Sockets and switches OUTPUTS The OUTPUTS deliver balanced output signals. An output trans former can be equipped optionally (see page 29). Since both connectors are working in parallel, unbalancing one connector also unbalances the other one. If for example a mono jack connector is plugged into to the jack socket, the OUTPUTS XLR socket is operating unbalanced as well. -
Page 11: Control Elements
Control Elements Preamplifier MIC GAIN The MIC GAIN control determines the level of preamplification. The preamplification values cover a range from +8 dB up to + 68 dB. Further information on page 12, „GAIN adjustments“. If the optional microphone input transformer is installed, the scaled values are to be increased by ca. -
Page 12: High Pass, Instr./Line Gain, Instr./Line In, Instrument, Gain Adjustments
Control Elements Preamplifier High-pass filter This switch activates the high-pass filter (often also called a “rumble filter”), which operates from 50 Hz downwards with 12 dB/octave. The filter prevents the amplification of unwanted low frequencies. Compared to 6 dB/octave filters, the 12 dB filter works more intensively, thus more effectively –... -
Page 13: De-Esser
Conventional systems are dependent on the input level and work more intensively as the distance to the microphone is reduced. As a result, the SPL De-Esser does not need to be monitored and re-adjusted permanently to keep processing constant – and it can always be applied before the compressor, as changing its position would not be an advantage. -
Page 14: Insert
Control Elements Insert INSERT The insert button activates any attachments of external equipment for effects, such as delay or reverb, that are connected to the INSERT SEND/RETURN loop on the rear of the Channel One. This binds them into the signal chain, thereby enhancing the processing capabilities ad infinitum. -
Page 15: Compressor/Limiter
Control Elements Compressor COMPRESSION The COMPRESSION control sets the intensity of compression. Turning the control clockwise increases compression. The working area spans between 0 dB (fully left) and -32 dB (fully right). The compressor applies the so-called “soft-knee” characteristic, which means it starts processing earlier than with hard-knee curve (see page 26, diagram 1, curve B). -
Page 16: Spl Compressor Technology
A further technical specialty of the circuitry contributes to the high audio quality of the compressor in the Channel One: SPL’s double VCA drive. One VCA receives the in-phase, the other the out-of-phase signal. Subsequently the signal is passed through a differential amplifier. -
Page 17: Equalizer
Control Elements Equalizer The ON button inserts the equalizer/FET distortion module into the signal path. Under normal circumstances the input signal comes from the compressor. With the EQ PRE COMP. button the equalizer can be switched in before the compressor so that the input signal is received from the de-esser or insert. -
Page 18: Lmf, Lmf -/+, Mhf, Mhf -/+, Recommendation On Frequency Settings For Lmf And Mhf
Control Elements Equalizer The center frequency of the half-parametric bass filter is set with the LMF control (low/mid frequencies). The adjustable frequency range lies between 30 Hz and 700 Hz so that this filter covers a range of about 4.5 octaves, allowing it to be used from the deepest bass to the lower mid range. -
Page 19: Air Band, Fet Distortion
Control Elements Equalizer/FET Distortion AIR BAND The high frequency filter in the equalizer module is described as the AIR BAND. A coil- capacitor-filter with so called bell characteristics and a center frequency of 17.5 kHz comes into operation here. At this frequency the maximum possible accentuation is +10 dB, the maximum possible damping is -10 dB. -
Page 20: Output
Control Elements Output OUTPUT GAIN The outgoing signal can either be dampened to -20 dB or further amplified by +5.5 dB with the OUTPUT control to provide optimal drive to the subsequent units or the optional AD converter. The selected output level is shown on the PPM OUTPUT display in the display field. Before a recording commences the OUTPUT control should be set to 0 dB (12 o’clock posi- tion): the uninfluenced values are then legible and available for adjustment of the preampli- fiers levels. -
Page 21: Headphone Monitor
Control Elements Headphone Monitor An individual monitoring mix is important for best working conditions and especially a good intonation. That is why the Channel One is equipped with a headphone monitor section, providing a headphone amplifier and a mixing stage to generate an individual mix for the musician with playback and recording signals. -
Page 22: Display Area
Control Elements Display area All status and level displays are concentrated in a central display area, so all important infor- mation can be perceived at a glance. S-DETECT The S-DETECT LED shows when sibilants have been detected. It is only active when the de-esser is switched on, but it is independent from the S-REDUCTION control. -
Page 23: Gain Reduct., Ppm-Output
Control Elements Display area GAIN REDUCT. The GAIN REDUCT. display provides information about the processing being undertaken with the compressor/limiter or the noise gate. The level changes, perhaps caused by compres- sion, are scaled in 1.5 dB steps. The display is activated when the compressor/limiter module is switched on. -
Page 24: Specifications
Specifications Microphone input Frequency range: 10 Hz-100 kHz (100 kHz = -3 dB) Common mode rejection: 1 kHz: -80 dB/10 kHz: -78 dB (@ -20 dBu) THD & N: Gain: A-weighted: 20 dB -97,1 dBu 40 dB -91,1 dBu 65 dB -69,4 dBu Dynamic range: 118 dB... -
Page 25: Block Diagram
Block diagram Channel One... -
Page 26: Measurements
Measurements Compressor/Limiter, Air Band Diagram 1: compressor characteristics Reference curve A displays the relation between input and output. Curve B shows the curve charac- teristics of the compressor. The soft knee characteristic is clearly visible. Curve C portrays the limiter’s curve characteristics. - Page 27 Measurements Mid-Hi Filter, Low Filter Diagram 3 displays various cut and boost settings of the MHF filter at 3 kHz. The proportional-Q characteristic is distinctly visible. Diagram 4 displays the curves of the LMF filter. Various cut and boost settings at 150 Hz.
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Page 29: Options: Ad Coverter, I/O Transformers
Please note that you can order products with optional equipment from all dealers, even if they do only list standard product versions, for example in an online store. Please contact your dealer or SPL before you place an order. Optional equipment can also be installed after sales. Available option for the Channel One, model 2950: •... - Page 30 Manual Channel One Model 2950...
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