Ashly MX-508 Manuale operativo - Pagina 6

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Operating Manual -MX-508 Stereo Microphone/Line Mixer

5. CONNECTIONS AND CABLES

The MX-508 mixer is fitted with four types of

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

3-pin XLR type female (mic inputs), tip-ring-sleeve (TRS)

phone jack, and RCA jack. Certain 1/4" jack connections

use an unbalanced mono plug, which is also shown.

Tip (+)

Ring (-)

Sleeve (Ground)

Tip (+)

Sleeve (Ground)

XLR pins are

numbered

in the

connector

insert.

2 = (+)

3 = (-)

1 = (gnd)

RCA Plug

Tip = (+)

Sleeve = ground

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 con-

struction. This type of cable should be used for all por-

table applications. Snake cables containing multiple

shielded pairs must be handled very carefully because the

leads tend to be fragile, and a broken conductor is diffi-

cult 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 (micro-

phone) 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.

Stereo Phone Plug

used for balanced

Mono Phone Plug

used for unbalanced

XLR

Male

XLR

Female

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 attenua-

tion 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 ra-

tio 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 connec-

tion, with a balanced input imped-

ance of 20K . 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 con-

troller, or direct out recording device to be used on individual

channels. The MX-508 has both single jack insert capabili-

ties as well as separate send and return jacks.

- To use separate send and return jacks, 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. You

must use unbalanced (tip-sleeve) mono plugs for this con-

figuration.

- To use the single jack insert, use a TRS (stereo)

plug in the send jack only, where the send output signal is on

the tip, and the return signal is applied to the ring. This

convention is most common among mixers.

- To use the send jack as a Direct Line Output

(pre EQ), you must use a special cable with tip and ring con-

nected at the MX-508 Send and a tip-sleeve mono plug at

the other end. Connecting tip and ring at the mixer send

jack is necessary for uninterrupted signal within the mixer

when using direct line outputs.

Ch.1

Pad (-20dB)

Mic

Input

Line

Input

Send*

(

TRS

)

Insertion

Return