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DMX-4 USB Mixer User Manual
21
USB Connection
• The USB specification limits the length of the USB
cable to 5 meters (about 16 feet), therefore the
DMX-4 should be placed near the computer. The
cable supplied is 6 feet long.
• The USB port on the computer must be USB 2.0
or higher (“high speed”). The device will not
work on USB 1.1.
• Plug directly into one of the computer’s USB
ports. Do not go through a hub.
• Note that the USB cable plugs into the DMX-4
with the beveled side (and the molded USB logo)
facing down.
Input Connections
• Dynamic or electret condenser microphones can
be used with the DMX-4. Dynamic microphones
generally have lower output levels and require
the input gain sliders to be set higher. Electret
condenser microphones require phantom power,
which can be turned on in the Antex Mixer
Program. Electret condenser microphones
generally require a minimum of 9 to 12 volts for
phantom power. Condenser microphones that
require 48 volts will not work with the DMX-4.
• The DMX-4 inputs are balanced, which provides
better noise and hum rejection. However, we
recommend not running the microphone cables
near computers, monitors, transformers or other
equipment which may cause humming or buzzing
in the audio. Balanced connections may be run
long distances.
• Line level devices, such as video conferencing
systems or telephone line interfaces may be
DMX-4 USB Mixer User Manual
22
connected to the DMX-4. Note that inputs 1 and
2 do not have gain adjustments in Line setting,
the gain is fixed at 0dB. If the line level device
has an output level control, this can be used to
adjust the recording level. If the device does not
have an output level control, then it would be
better to connect it to inputs 3 or 4, which do
have gain adjustment in Line setting.
• To connect unbalanced (single ended) devices,
use an appropriate cable, such as XLR male to
RCA male. These cables connect pins 1 and 3 of
the XLR together, which grounds one of the 2
balanced inputs. We recommend keeping
unbalanced connections to about 6 feet
maximum.
Monitor Connections
• The monitor outputs are unbalanced (single
ended) line level (2VRMS max). They are
intended to connect to telephone line interfaces,
video conferencing systems, or PA amplifiers.
• The loudness level of the monitor output can be
adjusted with the slider control in the Antex
Mixer Program.
• Use caution when connecting this or any other
device to the public telephone network. Do not
put too loud a signal level into the phone line.
This could damage telephone equipment and/or
be painfully loud to the person on the other end
of the phone line.
• Any combination of the 4 inputs may be
independently routed to the monitor outputs
using the Antex Mixer Program. When
connecting someone by phone, the caller would