Kramer-electronics VM-1610 User Manual download pdf (Page 12)

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8.4.1

Using A Microphone

A microphone is a device which converts sound waves to electrical impulses. High quality

microphones usually generate a very low signal level. Low noise, high fidelity pre-amplification is

required to boost the output of a microphone before the signal reaches the main audio amplifier where

it is processed as a regular audio signal. Pre-amplifying low level microphone signals is achieved by

precise matching of microphone impedance and use of low noise electronic amplifying devices. In

order to obtain the highest quality output signal from a microphone, its internal impedance should be

matched to that of a pre-amplifier with exactly the same input impedance. Microphone impedance

may vary from a few ohms to several mega-ohms.

When a microphone is used/not used, perform the following steps:

1. Press the Mic/Line pushbutton located at the front of the machine, to switch to “Mic” position.

This is done in order to compensate for microphone low input level.

2. Release Mic/Line pushbutton (no microphone) in normal operation (“Line” position).

8.5 Programming The VM-1110 and VM-1610

The mode of operation (programming) is selected by activating one of the 1:10, 2x1:5, operating

mode switches. These programming switches illuminate as the selection is made and function as

follows:

1:10 position - splits channel "1" Input (VM-1610) or input "A" (VM-1110) to all 10 outputs.

2x1:5 position - splits channel "1" and channel "2" inputs " to outputs "1-5" of channels "1" and

"2" respectively (VM-1610). Or: Splits input "A" and input "B" " to outputs "1A-5A" and "1B-

5B" respectively (VM-1110).

1. Connect a balanced audio source to the input sockets located on the rear panel of the machine,

using the appropriate cables and connectors and noting the correct polarity (+/-) of the input

signal.

2. Connect up to 10 acceptors to the output sockets, using the appropriate cables and connectors.

3. Operate source, acceptors and the VM-1110/1610.

4. Use the 1:10, 2x1:5, operating mode switches to select the desired mode of operation.

5. When in stereo mode, connect each channel to the appropriate inputs and outputs and select 2x1:5

mode of operation.

8.6 Programming The VM-80A

The VM-80A mode of operation can be selected by pressing one of the 1:8, 2x1:4 operating mode

switches. These programming switches illuminate as the selection is made and function as follows:

 1:8 position - splits channel "1" input to all 8 outputs (channels "1"&"2") when pressed.

 2x1:4 position - splits channels "1"&"2" inputs to output channels "1"&"2" respectively when

pressed.

1. Connect a balanced stereo audio source to the terminal blocks located on the rear panel of the

machine, using the appropriate cables and connectors and noting the correct polarity (+/-) of the

input signal.

2. Connect up to 8 acceptors to the output sockets, using the appropriate cables and connectors and

noting the correct polarity.

3. Operate source, acceptors and the VM-80A.

4. Use the

1:8

or the

2x1:4

operating mode switches to select the desired mode of operation.

8.7 Audio System Setup

In broadcast and in high quality industrial studios, audio signals are of the balanced type. In order to

distribute balanced audio signals, a balanced audio source is needed. Figure 5 illustrates a typical

usage of a balanced audio amplifier.

Perform the following steps if necessary):

1. Connect the audio source to the balanced audio DA (VM-5AD for example).

2. Connect the audio acceptors to the output sockets of the balanced DA.

3. Use the controls of the DA (if available) to adjust signal levels (see sections 8.3 and 8.4 for more

details).

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Kramer-electronics VM-1610 User Manual Page 12

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