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. [. . . ] 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 preamplification values extend up to + 65 dB. 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. adding level in the EQ stage) is guaranteed. 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. The De-Esser module is activated when the button is on. 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. Finally its operation is as simple as pulling on the hand brake. 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. [. . . ] The level change, perhaps caused by compression, are scaled in 1. 5 dB steps. The display is activated when the Compressor/Limiter module is switched on. Power Supply Built around a torroidal transformer, the power supply allows for a minimal electromagnetic field with no hum or mechanical noise. The power supply`s output side is filtered by an RC circuit to extract noise and hums caused by your power service. 6000 µf capacitors smooth out the positive and negative half waves. [. . . ]