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724-746-5500 | blackbox.com
Page 10
ACX1MT
724-746-5500 | blackbox.com
Chapter 1: Specifications
• The output of the CPU module is connected to the audio input of the sound card (blue). Choose this connection if the
microphone has its own pre-amplifier.
NOTE: The CON module can do the pre-amplification of the microphone as well. Open the CON module, locate the “MIC” jumper
on the audio board and close the pins.
Table 1-2. Analog audio specifications.
Specification Description
Transmission Format Digitized virtually CD-quality audio (16-bit, 38.4 kHz)
Signal Level Line-level (5-volt peak-peak maximum)
Input Impedance 47 kOhm
Connections CPU Unit (2) 3.5-mm stereo audio plug (audio in and audio out)
Connections CON Unit (2) 3.5-mm stereo audio plug (audio in and audio out)
1.1.9 Digital Audio Interface
The digital audio option supports the unidirectional transmission of digital audio data.
Up to three sources can be connected to the CPU module. The active source is transmitted. If several sources are active, the XLR
signal takes priority, otherwise the first active signal.
Up to three sinks can be connected to the CON module. The signal is available at all outputs concurrently.
DKM Modular Extender with digital audio option includes a built-in sample rate converter that provides predefined sample
frequencies at the CON module’s output.
The user can set the following parameters directly via a configuration file:
• Activate or deactivate sample rate converter
• Set sample frequency of the sample rate converter. The following sample frequencies are available:
– 32.0 kHz
– 44.1 kHz
– 48.0 kHz
– 96.0 kHz