Digidesign 1622 I/O Audio Interface Installation Guide Digidesign Inc. 3401-A Hillview Avenue Palo Alto, CA 94304 USA tel: 650·842·7900 fax: 650·842·7999 Technical Support (USA) 650·842·6699 650·856·4275 Product Information 650·842·6602 800·333·2137 Fax on Demand 1-888-USE-DIGI (873-3444) World Wide Web www.digidesign.com Digidesign FTP Site ftp.digidesign.
Copyright Communications & Safety Regulation Information This User’s Guide is copyrighted ©1999 by Digidesign, a division of Avid Technology, Inc. (hereafter “Digidesign”), with all rights reserved. Under copyright laws, this manual may not be duplicated in whole or in part without the written consent of Digidesign.
contents Using the 1622 I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 The 1622 I/O Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1622 I/O Front Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1622 I/O Back Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
iv 1622 I/O
Using the 1622 I/O The 1622 I/O™ is a 16-channel digital audio interface which features 20-bit analog-to-digital, and 24-bit digital-to-analog converters for superior dynamic range, reduced noise floor, and the capability to work with the full 24-bit mixing, editing, processing, and mastering environment of Pro Tools.
Internal This is the 1622 I/O standard setting. In this mode, the 1622 I/O sample rate is generated by its internal crystal oscillator (whose frequency is determined by the Sample Rate setting in the Session Setup window). Internal mode should be active whenever the 1622 I/O is not synchronized to an external clock source. Digital This setting indicates that a S/PDIF word clock signal is the source for the 1622 I/O sample rate.
4. Sample Rate 6. Output Meters These LEDs display the current sample rate of the 1622 I/O internal crystal oscillator, which can be either 44.1 kHz or 48 kHz. In Pro Tools, this is set in the Session Setup window or in the Hardware Setup dialog. These LEDs indicate whether or not signal is present at one of the two outputs. Segment 1 (green) indicates –20.0 dB. Segment 2 (yellow) indicates –3.0 dB. Segment 3 (red) indicates –0.1 dB. The 1622 I/O provides the following sample rates: 7.
1622 I/O Back Panel The 1622 I/O has the following back panel connectors, moving from left to right: Back panel of the Digidesign 1622 I/O 1. Analog Audio Inputs 1–14 These are balanced, 1/4-inch TRS jacks for analog audio input connections. Inputs can be individually calibrated from +4 dBu to –10 dBV line levels and higher in 2 dB gain steps, using the Other Options dialog (Setups > Hardware > Other Options).
The 1622 I/O S/PDIF jacks are 24-bit capable, unbalanced, two-conductor, phono (RCA) jacks. Because input channels 1–2 of the 1622 I/O are software selectable between analog or digital format, input to these two digital channels is disabled when analog input is chosen in the Hardware Setup dialog in Pro Tools. Output is continuously active on the S/PDIF output jack, even if the 1622 I/O input selector is set to Analog in the Hardware Setup dialog.
2 Set the track input to the 1622 I/O input channel you just set in the Other Options dialog. 3 Play the instrument at maximum vol- ume, sending a steady signal to the 1622 I/O. (You will not be able to hear the input signal while adjusting your levels in this dialog, but you can see the levels on the input meters on the 1622 I/O.) 4 Note where the instrument output signal Setting Up Your Studio The diagrams below provide suggestions for connecting studio gear to your system.
Using the 1622 I/O Interface as Stand-Alone Audio Converter The 1622 I/O can be used apart from Pro Tools as a stand-alone 2-channel, 20-bit analog-to-digital, or 24-bit digital-to-analog converter. To use the 1622 I/O as a stand-alone A/D converter: 1 Turn off any digital devices that may send a word clock signal to the 1622 I/O S/PDIF digital input. 2 Turn on the 1622 I/O. The 1622 I/O searches briefly for a word clock signal on channels 1–2 of its digital input ports.
8 1622 I/O
Technical Specifications General Analog Inputs/Outputs: ■ Balanced 1/4" TRS phone jacks; inputs with software-controllable input gain; outputs switchable between +4 dBu and –10 dBV line levels A/D Specifications ■ Dynamic Range: ≥ 98 dB (balanced, 22 Hz–22 kHz) Input Voltage Reference = +18 dBu Input Gain Setting = minimum Digital I/O S/PDIF: ■ 2 channel; coaxial RCA connectors ≥ 97 dB (balanced, 22 Hz–22 kHz) Input Voltage Reference = +4 dBV Input Gain Setting = maximum Sample Rate: ■ 44.
D/A Specifications ■ 24-bit D/A converters, Delta-Sigma Dynamic Range: ≥ 103 dB (balanced, 22 Hz–22 kHz) DAC Input Reference = 0 dBFS THD+N: ■ 0.003%; DAC Input Reference = 0 dBFS, 20 Hz–20 kHz Maximum Output Level (+4 dBu gain position): ■ +18 dBu Frequency Response: ■ ± 0.3 dB, 20 Hz–20 kHz Physical Specifications Power Requirements: ■ 90–260 VAC, 47–440 Hz, 18VA; auto-switching Weight: ■ 8.2 lbs. (3.7 kg) Dimensions: 1U external rackmount device 19" x 1.75" x 7.5" (48.26 cm x 4.45 cm x 24.
