DLM-821 Internal Jumper Locations

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	+ - G

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.

6.2Main and Mono Outputs

+ - G

Unbalanced

Input

+- G

Euroblock + - G Input

Balanced

Connections Input

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

+ - G

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.

Unbalanced

Output

+- G

Euroblock + - G Output

Balanced

Connections Output

Fig. 5.2 - DLM-821 Internal Jumper Locations

6. CONNECTIONS AND CABLES