6. SPECIFICATION
6.1 General
Number of Ports 18 or 36 if second audio card is fitted.
6.2 Matrix Audio Specification
Port Type 4 wire electronically balanced
Frequency Response -3dB @ 25Hz and 15.5kHz
Nominal Gain 0dB ± 1dB
Gain Adjustment Range +12dB / -37dB from PathFinder Lite
Maximum Input Level +20dBu
Crosstalk < -60dB worst case
Noise < -55dBu CCIR weighted, quasi-peak
Distortion < 0.2% THD @ 0dB gain
Input Impedance ~10kR
Output Impedance Low (<20R)
6.3 Real Time Performance
Transmission time delay <50ms (defined as time taken from a key press to the audio
reaching the destination). Based on statistical analysis of the likely number of key presses at
any given instant.
6.4 Panels
Panel Communication Balanced RS422 at 230.4 kbaud
Power See individual sections
Maximum cable run >600m.
Connection to Matrix 4 twisted pair cable. STP recommended:
UTP acceptable.
L/S Volume Control Max attenuation or hold off adjustable from -
20 to -76dB in PathFinder Lite
Microphone amplifier gain adjustment +14 to -16dB from PathFinder Lite
Loudspeaker amplifier Nominal 5W into 8R
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