Unbalanced Inputs; Connecting Speakers - Martin Audio MA900 User Manual

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CONTENTS

7.1.2

T o use a n un b alan ce d sou rce , co n ne ct pin 3 (ring on

T RS jack) to th e sh ield o f th e con ne cto r. If you le ave

o ne p in disco nn ecte d , yo u w ill lose 6 d B.

A b ette r m eth od for usin g u nb ala nced so urce s is

sho wn b e lo w. Th is is sim ila r to th e con ne ction fo r

b alan ce d lin e s, b ut pin 3 is co n ne cte d to th e sh ield at

the sou rce . T he h um an d n oise re je ction for th e cab le

is eq uivalen t to th a t fo r a b ala nced line . T o min im ize

h um in the a u dio, u se ba lan ce d inp uts w he ne ver

p ossible .

Unbalanced line connection

For two-channel (stereo) operation, use both channels A and B. For tandem stereo or bridged mono operation, use

only one of the inputs. See

7.2

Connecting speakers

S pe aker co nn e ctio ns are m ad e via the tw o N eu trik NL 4F C S pe akon co nn e ctors. Th e S pe akon co nn e ctor is d esign ed

for h ig h p ow e r lo ud spe ake r use a nd m e ets all w orldw id e safety req uirem en ts.

The Speakons are wired:

The right Speakon, Channel A, has both channel A and B outputs available, and is useful for bridging and bi-amp

operation (see bridged mono operation on page 7). The left Speakon, Channel B, carries only the channel B

output.

Channel A and B into two separate

Speakons.

Never connect either output terminal to ground or to some other output or input terminal.

For normal two-channel operation, connect each speaker load across the output's positive and negative terminals.

Pay attention to loudspeaker polarity; loudspeakers connected out of polarity can degrade sound quality.

Keep the loudspeaker cable as short as possible and use a good quality stranded cable. Do not use shielded wire,

such as microphone or guitar cable. The loudspeaker cable reduces the power of the amplifiers in two ways:

It increases the load impedance and introduces resistive power losses.