User Guide
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The optional ADC can convert two separate channels of audio. The second of the two channels received at the ADC Input is
determined by a connection on the rear panel. With no signal connected to EXT I/P, the second channel is fed from the DI
(Instrument) input on the front panel. Connecting a signal to EXT I/P makes that signal replace the instrument as the second channel
going into the ADC. The rst channel, however, will always be the main mic/line/inst input selected by the INPUT switch on the front
panel. The LED meters on the front panel can be used to view the levels of the two channels received at the ADC input.
Digital formats available on the ADC are AES, S/PDIF (optical and coaxial) and ADAT™ optical format. (The ADAT™ output can also
operate in high-speed SMUX mode for 6kHz transfer speeds, but is muted during kHz operation.) N.B. If RCA phono (S/PDIF) or
XLR (AES) connections are required, the relevant -pin D-type to RCA phono or XLR breakout cable is required (see below).
24-bit/96kHz ADAT™ or 24-bit/192kHz S/PDIF (optical/ lightpipe) interface operation
The card provides optical digital outputs for both ISA One ADC input channels, which operate over the sample frequency ranges .,
8, 88. and 6kHz (ADAT™) and also 76. and kHz (S/PDIF). The card features an ADAT™-type ‘lightpipe’ output and S/PDIF
TOSlink output connectors. ADAT™ lightpipe cables are available from your local dealer, or in the UK from Studiospares (tel +
(0)0 78 6): stock number 585-50.
24-bit/192kHz AES or S/PDIF operation (9-pin)
The card also provides AES and S/PDIF format outputs via a -pin D-type connector on the rear panel. The full range of sample
rates up to kHz are available. To access the digital signals from the -pin D-type output connector, the A/D card must be
purchased with either an AES or S/PDIF D-type conversion cable as follows:
AES cable: 9-pin D-type to 4 male XLR, S/PDIF cable: 9-pin D-type to 4 male RCA phono
Note: cables need to be purchased separately. Since there are two different cable options – XLR for AES and RCA phono for S/PDIF
– these are not included with the A/D converter options. Focusrite cables may be purchased from your local dealer. If you experience
difculty in obtaining these cables, contact your local distributor as listed in the back of this User Guide.