Ashly MX-508 Betriebshandbuch - Seite 6

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Operating Manual -MX-508 Stereo Microphone/Line Mixer

5. CONNECTIONS AND CABLES

The MX-508 mixer is fitted with five types of audio

connectors: 3-pin XLR type male (stereo outputs), 3-pin XLR

type female (mic inputs), tip-ring-sleeve (TRS) phone jack,

3 .5mm TRS phone jack (front panel stereo line in), and RCA

jack . Certain 1/4" jack connections use an unbalanced mono

plug, which is also shown .

Two-conductor (twisted pair) shielded cable is best for

all XLR type connections . Belden No . 8412, or its equivalent,

is an excellent cable due to its heavy construction . This type

of cable should be used for all portable applications . Snake

cables containing multiple shielded pairs must be handled very

carefully because the leads tend to be fragile, and a broken

conductor is difficult to repair .

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 minimize 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 .

5 .1 Microphone Input

The microphone input is an active

balanced type with a nominal impedance

of 1200 ohms . Its noise performance

is best with a 200 ohm microphone . A

plug-in transformer option is available

if you need the isolation . The Mic input

connector is a standard 3-pin XLR female

with the shield on pin 1, the (+) in-phase

connection on pin 2, and the (-) out-of-

phase connection on pin 3 .

5 .2 Input Pad

The Pad is a 20dB attenuation

switch on the rear panel for use with the

XLR microphone input . It has no effect

on the line input . It should normally be

left in the "out" position for best signal to

noise ratio and should only be used when

the input is being overdriven with the Gain

control at its minimum setting .

5 .3 Line Input

The line input is a standard 1/4"

TRS active balanced connection, with a

balanced input impedance of 20KΩ . It will accommodate a wide

range of input levels .

5 .4 Channel Send And Return Patch

A channel patch point allows a device such as graphic

equalizer, noise gate, compressor/limiter, remote level controller,

or direct out recording device to be used on individual channels .

The MX-508 has separate send and return jacks, both using

balanced signals for low noise . Use the send jack to feed the input

of the device to be inserted, and use the return jack for the output

of the inserted device . Single jack TRS insert is not available .

If using the send jack as a Direct Line Output (pre EQ),

use either a standard mono plug (tip-sleeve) or stereo (tip-ring-

sleeve) . The TRS plug gives the best noise performance into a

balanced input .