907-Audio (4-Channel, 24-Bit Audio Card); Figure 5-7: 907-Audio Expansion Card - Focal 907 User Manual

907-0601-00 Rev. C
5.7

907-AUDIO (4-Channel, 24-bit Audio Card)

Card P/N
Config. Dwg.
Diagnostics:
The 907-AUDIO expansion card is shown in Figure 5-7. The 907-AUDIO expansion card provides four
simultaneous channels of variable gain microphone inputs (J2-J5) and four channels of 2 W outputs for
speakers (J6-J9). The card supports 24-bit digital conversion of 20 to 20,000 Hz balanced and unbalanced
input signals with a dynamic range of 60 dB, and provides switch-selectable linear gains of 0.5, 1, 5, 10, and
100. An optional 12 VDC bias is available on each microphone input. All of the outputs are differential. If an
output is connected to a single ended input externally, or a speaker with a ground connection, the signal must
be transformer coupled. The 907 audio transformer board (907-AUDIO-T) allows for easy integration of
transformers into a 907 stack.
Configure switch SW13 to set the backplane data port used by the 907-AUDIO card. All ports (1~6) are
available. The default setting is data port #1.
Focal Technologies Corp.
907-0228-00
907-2030-00
LEDs Only

Figure 5-7: 907-AUDIO Expansion Card

Model 907 Video/Data Multiplexer – User's Guide
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