User manual WEISS ADC2

[. . . ] Florastrasse 42, 8610 Uster, Switzerland +41 1 940 20 06 +41 1 940 22 14 http://www. weiss. ch / http://www. weiss-highend. com GAMBIT ADC2 OPERATING MANUAL Software Version: 3. 0 OPERATING INSTRUCTIONS FOR GAMBIT ADC2 24Bit / 192kHz A/D CONVERTER INTRODUCTION INTRODUCTION Congratulations on purchasing the Weiss Gambit Series ADC2 A/D Converter ! The ADC2 is a two channel A/D converter designed for most demanding audio applications. It uses state of the art A/D chips in Weiss Engineering's proven "correlation technique" configuration, which lowers converter imperfections and improves the SNR ratio. For best noise rejection, the analogue input signal is kept balanced from the input connectors up to the converter chips. A high quality microphone preamp is available as a standard feature. [. . . ] Double-click resets both input and output peak hold. Daniel Weiss Engineering Ltd. , Florastr. 42, CH-8610 Uster +41 1 940 20 06 +41 1 940 22 14 http://www. weiss. ch Page 4 of 4 weiss@weiss. ch OPERATING INSTRUCTIONS FOR GAMBIT ADC2 24Bit / 192kHz A/D CONVERTER OPERATION Threshold If "threshold" is lit, the rotary knobs control the threshold of the compressor section. The value is shown in the numeric display. If "peak hold" is active, the output peak value is displayed. The ADC2 has a two-segment dynamics compressor. The threshold can only be adjusted for the compressor section, which has a fixed ratio of 2:1. The limiter has a fixed ratio of :1 with a fixed threshold of 0. 0 dBFS. Because the signal before the output gain never exceeds 0. 0dBFS, the limiter is inactive if the output gain is £ 0. 0dB. If the threshold is set to 0. 0 and the output gain is below 0. 0 the dynamics section is inactive. 3. -12. 0 -6. 0 0. 0 +6. 0 0. 0 -6. 0 -12. 0 Fig. 5 Compressor with -6. 0dB Threshold 0. 0 -6. 0 0. 0 -12. 0 -12. 0 -6. 0 -6. 0 0. 0 +6. 0 The overall gain reduction applied by the compressor / limiter is shown in the yellow bargraph. Note that the compressor uses auto gain makeup: depending on the threshold, a gain is added after the compressor to ensure that 0. 0 dBFS input results in 0. 0 dBFS output (graphically speaking, auto gain make-up "fixes" the transfer curve at the (0. 0, 0. 0) point). -12. 0 -12. 0 -6. 0 0. 0 +6. 0 Fig. 3 Compressor with 0. 0dB Threshold To activate the limiter, set the output gain to a positive value. The boost will drive the signal into the limiter. The gain reduction applied by the limiter is visible on the yellow bargraphs. To soften the transmission from linear to limiter segment, the compressor can be activated by adjusting the threshold parameter. 4 shows a setting with a threshold of ­3 dBFS, Fig. The range of possible threshold values is listed on p. 13. Daniel Weiss Engineering Ltd. , Florastr. 42, CH-8610 Uster +41 1 940 20 06 +41 1 940 22 14 http://www. weiss. ch Page 5 of 5 weiss@weiss. ch OPERATING INSTRUCTIONS FOR GAMBIT ADC2 24Bit / 192kHz A/D CONVERTER OPERATION Sync and Dither Control Panel If none of these two keys are lit, the ADC2 uses internal sync. [. . . ] Input Impedance > 5kOhm Analogue Microphone Inputs 2 channels, symmetrical, not earth free, on two XLR female connectors, pin 2 hot. Input Impedance > 5kOhm 48V phantom power switchable AES/EBU Input Input fs range: 44. 1kHz 48. 0kHz 88. 2kHz 96. 0kHz 176. 4kHz 192. 0kHz All sampling frequencies must lie within +- 100ppm of the nominal sampling frequency. 24 Bits XLR female 110 Ohm Maximum Input Wordlength: Connector: Impedance: AES/EBU Output Output fs range: 44. 1kHz 48. 0kHz 88. 2kHz 96. 0kHz 176. 4kHz 192. 0kHz 24 Bits Professional format two times XLR male 110 Ohm single wire or double wire for fs higher than 48kHz (switch selectable) Maximum Output Wordlength: Channel Status Data: Connector: Impedance: Format: Daniel Weiss Engineering Ltd. , Florastr. 42, CH-8610 Uster +41 1 940 20 06 +41 1 940 22 14 http://www. weiss. [. . . ]