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Operating Manual - DLM-821 Stereo Ducking Line/Microphone Mixer
Ashly Audio Inc.
Fig. 5.2 - DLM-821 Internal Jumper Locations
6. CONNECTIONS AND CABLES
6.1 Inputs
The DLM-821 stereo inputs use two 20k ohm balanced (10k ohm unbalanced)
Euroblock connectors per channel. Wire the (+) signal to the (+) terminal, the (-) signal
to the (-) terminal, and the shield to G. If an unbalanced (two conductor) input signal is
used, connect the shield to both (-) and G.
To drive a mono source into the stereo mix, simply plug the signal into the
right channel input and press the Mono switch in. Additionally, channels 1 through 4
are switchable to mic level (see sec. 5.4) to add 30dB gain for microphone inputs.
6.2 Main and Mono Outputs
Outputs are 200 ohm "pseudo-balanced" Euroblock connectors, which have bal-
anced impedance with a single-ended signal source and can be wired balanced or un-
balanced. Nominal operating level is +4 dBu and maximum level is +23dBu. The
Mono output is switchable to a nominal -40dBu microphone level. If wiring an output
as unbalanced, use the (+) and G connections.
If low level and high level lines (e.g., microphones and mixer line outputs), or
if either of these lines and speaker cables are run parallel for long distances, crosstalk
may be significant. In fact, the crosstalk (signal leakage between cables) can cause an
electronic feedback loop, oscillation, and possibly damage to the equipment. To mini-
mize crosstalk, physically separate low level (microphone) cables from speaker cables
by the greatest feasible distance. At any point where cables meet, run low level cables
perpendicular to high level or speaker cables. If low and high level or speaker cables
must be run parallel and in close proximity to one another, they should be bundled
separately. Shielded cable should always be used for mic and line cables.
Euroblock
Input
Connections
+
-
G
+
-
G
+
-
G
+
-
G
Unbalanced
Input
Balanced
Input
+
-
G
+
-
G
+
-
G
+
G
Unbalanced
Output
Balanced
Output
Euroblock
Output
Connections