User manual SPL TRACKONE

[. . . ] Manual Model 2058 Channel Strip Manual Track One Version 1. 0 ­ 4/2001 R & D: Ruben Tilgner Model 2058 The information in this document has been carefully verified and is assumed to be correct. However Sound Performance Lab (SPL) reserves the right to modify the product described in this manual at any time. This document is the property of SPL and may not be copied or reproduced in any manner, in part or full without the authorization of SPL. Limitations 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 use of the unit, however caused and on any theory of liability. [. . . ] The GAIN REDUCTION metering of the master unit now is the master display for both units. If the two units are to be used separately again, the wiring must be disconnected and the SLAVE unit must be set to MASTER. IMPORTANT: If two units are connected for master/slave operation, NEVER EVER switch both units to MASTER!Both units would try to control each other - in worst cases, damaging the units can not be excluded. 8 Preamplifier Stage Control Elements Microphone Gain The Microphone Gain control determines the preamplification of the microphone signal. The signal can now be levelled with the assistance of the PPM output display. To achieve a good working level the values should range between 0 and +6 dB. At these levels an optimal drive level and enough headroom for further processing (e. The Clip LED will warn you of potential peaks; if during recording the Clip LED illuminates, the preamplifying value is to be reduced accordingly. Control Elements De-Esser On The first module behind the pre-amplifier stage is the De-Esser, which immediately removes disturbing S-sounds when required. LED in the display will show that S-sounds are being detected regardless of the selected S-Reduction value, in other words even when the button is switched off detection is still shown in the display. S-Reduction With the S-Reduction control you can determine the intensity of S-sound reduction. Because processing is undertaken from comparison with the level of the entire frequency spectrum ( see next section "Technical information . . . ") the processing is more intensive with extreme S-sound levels than with those of lower levels. After processing the output signal has a consistent S-sound level. 10 De-Esser Technical information regarding the De-Esser In contrast to common de-essers that influence a frequency 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. The S-frequencies that lie in the unpleasant range are automatically recognized, the phase is inverted and mixed with the original signal. In this manner the disturbing frequency is quenched and the hissing noise reduced. This method of operation has distinct advantages because it is unobtrusive and helps retain the original tonal quality. Compressor-typical side effects such as lisping or nasal tones do not occur. The reduction is accomplished by comparing the entire level with the individual S-sounds: the De-Esser functions only when the S-noise level exceeds the average level of the entire frequency spectrum. This means for example that original S-sounds with a determinate S-portion are not processed whereas those that are too loud, or do not effectively contribute to the sound, are reduced ­ the character of the voice remains unchanged. A further specialty is the integrated auto-threshold-function which makes processing independent of the input level. Even when the speaker or singer does not maintain a constant distance to the microphone, processing is retained at the pre-set S-reduction value. Conventional systems are dependent on the input level and work more intensively as the distance to the microphone is reduced. Control Elements i info Compressor/Limiter Control Elements On The On button activates the Compressor/Limiter module. At the same time the Gain Reduction display shows the processing intensity (see section "Gain Reduction" on page 16). Limiter The Limit button switches the Compressor to limiter mode. The Compression control serves the purpose of controlling the threshold. [. . . ] All levels above -50 dB are covered. 15 Control Elements Display: PPM Output Output/Display The PPM Output display shows the peak reading of the output level (calibrated to 0 dB) and is present at the analog outputs on the rear of the unit. The value "+12 dBu" marked on the right side represents the maximum level of the optional AD/DA converter which should not be exceeded. (Further information is given in the directions to the AD/DA converter). Although the values of the PPM Output display only cover up to + 12 dB sufficient headroom remains internally (approximately 6 dB) so that the output value can exceed this limit without causing clipping. [. . . ]