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23

Block Diagram

Channel One, Model 9945

© 1999 SPL elec

tr

onics GmbH.

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Summary of Contents for 9945

Page 1: ...Model 9945 Manual Channel Strip...

Page 2: ...imitations of Liability In no event will SPL be liable for any damages including loss of data lost profits cost of cover or other special incidental consequential or indirect damages arising from the...

Page 3: ...ng De Esser 11 Insert Insert 12 Compressor Limiter On 12 Limit Gain Reduction Noise Gate 13 Make Up Technical Information regarding the Compressor Limiter 14 Equalizer On Pre Comp Air Band 15 Mid Hi B...

Page 4: ...s for sound processing the total bandwidth of subtle corrections to low fidelity sounds is available The versatility and completeness of the unit permits its use in additional areas over and above the...

Page 5: ...l One The unit should be situated away from heat sources and direct sunlight Avoid installation in environments exposed to vibrations dust heat cold or moisture Keep the unit away from transformers or...

Page 6: ...6 Connections Rear Front Wiring...

Page 7: ...e Mic connector is used to plug in microphones of any type dynamic condenser or tube microphones etc If 48 V phantom power is required for some mics switch on the 48 V button For further information p...

Page 8: ...o both channels of the converter The maximum input level should not exceed 12 dBu to avoid clipping of the converter 12 dBu represents the digital full scale level 0 dBfs Playback Inputs The playback...

Page 9: ...re is to be adhered to Firstly connect the microphone to the Channel One then switch on the phantom power you can now commence work When recording has been completed firstly switch off the phantom pow...

Page 10: ...The Clip LED will warn you of potential peaks if during recording the Clip LED illuminates the preamplifying value is to be reduced accordingly Instrument Line On Mic Off This button allows selection...

Page 11: ...y band of about 2 octaves with compressor techniques the Auto Dynamic De Esser utilizes filters that process only the reducible S frequencies but do not interfere with the remainder of the spectrum Th...

Page 12: ...essor EQ combination which because in this manner the Channel One can be used as 2 independent units broadens the range of uses enormously As long as units are not connected to the insert loop the sig...

Page 13: ...in the display field is of great assistance The effect on the selected compression rate is scaled in 1 5 dB steps Depending on signal source and dynamic structure the reduction values should lie betwe...

Page 14: ...t distortions Even the control of the release time is dependent on the input signal Fast and large level fluctuations are correspondingly processed with shorter time constants than minor fluctuations...

Page 15: ...within certain frequency ranges these ranges should first be reduced with the EQ The signal can subsequently be compressed more easily If not done in this sequence the compressor would react very stro...

Page 16: ...constant Q filters if a more thorough setting has been chosen this will lead to far preciser definition of the frequency range to be processed This in turn minimizes influences from adjacent ranges Th...

Page 17: ...distinctly perceptible harmonics The distortion stage is located in front of the equa lizer so that the even newly created spectrums can be processed with the EQ The overmodulated field effect transis...

Page 18: ...signal when activated the PPM Output display does not show any values An instance of a sensible application could possibly be when the output signal of the Channel One together with the playback sign...

Page 19: ...ing starts whether he can hear himself and the playback adequately The best conditions for good intonation stemming from a relaxed working environment prevail Another practical use of the headphone mo...

Page 20: ...rdriven Microphone Instrument Line Gain an excessive Make Up value in the Compressor Limiter too much boost in the EQs or too high output level Possible causes of overload can be quickly detected by s...

Page 21: ...ly 6 dB so that the output value can exceed this limit without causing clipping The range of optimal noise performance lies between 0 and 9 dB Built around a torroidal transformer the power supply all...

Page 22: ...rument Input Frequency Response 10 Hz 100 kHz 100kHz 3dB Common Mode Rejection 1 kHz 80 dB 10 kHz 78 dB 0dBu only Line Input THD N Amplification A weighted 5 dB 99 4 dBu 20 dB 97 2 dBu 42 dB 79 4 dBu...

Page 23: ...23 Block Diagram Channel One Model 9945 1999 SPL electronics GmbH...

Page 24: ...imiter The reference curve A displays the relation between input and output Curve B shows the curve characteristics of the Compressor The soft knee characteristic is clearly visible Curve C portrays t...

Page 25: ...ous cut and boost settings of the Mid Hi filter at 3 kHz The proportional Q characteristic is distinctly visible Diagram 4 displays the curves of the Low Band filter Various cut and boost settings at...

Page 26: ...authorized SPL warranty repair facility in the country where purchased or to the SPL factory in Germany in the original packaging or a replacement supplied by SPL with all transportation costs and ful...

Page 27: ...27 Copy Master...

Page 28: ...28 Manual Notes...

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