Martin Audio – MA2.8s Amplifier
ENGLISH
14
8 O PE R A TI O N
8 .1 O p e r a t i n g pr e c a u t io n s
• M ake su re th a t th e p ow er sw itch is se t to “O FF ” b efore con ne cting a n y in p ut o r o utpu t o r op e ra tin g th e
switche s o n rea r pa n el. S ee p ag e s 9 ab ou t insta lla tion .
• M ake su re th a t th e A C ma ins voltag e is co rre ct a n d th e sam e a s th e o ne p rin te d o n th e rea r p an el of the
a mp lifie r. S e e pa ge s 1 0, a bo ut op era ting vo ltag e a nd p o we r con su mp tio n.
• M ake su re th a t th e switch es o n the re ar p an e l fo r o pe ra tio n m od es, g ain-switch, clip -limite rs, a n d th e M LS
switche s a re in the co rre ct p osition . S ee p a ge 7 ab ou t o pe ra tin g mo d es, p ag e 1 5
ab ou t clip lim iters a nd 9 fo r
the M LS sw itche s.
• It is a lwa ys a go od id ea to turn d ow n the g a in co ntro ls du rin g po we r-u p, to p re ven t spe aker da ma g e in ca se
a h ig h sig na l is pre se nt at the in pu t.
8 .2 Po w e r in g u p – So f t s t a r t
W he n yo u p ow e r up th e am p lifier it ta ke s a cou ple o f se con ds to che ck its circu its. T his is kn ow n a s th e "so ft-start" or
"slow -start" se qu en ce. T h e fa ns th en blow a t h ig h spe ed be fo re go i n g i n t o " i d le " a nd th e tw o b ottom g re e n LE D ’s
illum in a te to sho w the a m plifie r is o pe ra tio na l.
8 .3 I n p u t a t t e n u a t o r s
T he two in pu t level atte n ua to rs on th e fron t p an e l ad ju st th e sig na l leve l fo r the ir re sp ective a mp lifie r ch a nn el in a ll
m od es. T he y a re calibrate d in d B to h elp th e settin g up of a ctive lo ud sp e aker system s.
In brid g ed m o de , bo th co n trols m ust b e in th e sa m e po sitio n, so tha t the sp ea ke r loa d w ill b e sh a re d eq u ally be tw ee n
the cha n ne ls.
8 .4 I n d ic a t o r s
T he two -bo tto m gree n ”ON ” L ED ’s in dicatin g tha t the o utp ut circuits are receivin g th e corre ct ra il vo lta ge .
T he ”-4 0 d B” LE D’s illum ina te if the ou tp ut sign a l is g rea te r tha n -40 dB (w ith 0 dB a s refere nce to fu ll ou tp u t po we r).
T he se L E D’s a lso act a s sig na l p re se n t in dicators.
F ro nt In dica tors
T he Clip /limit ind ic ato r te lls w he n the a mp lifie r o utpu t is clipp in g o r lim itin g . It ha s tw o d ifferen t ind ica tion statuse s:
• If th e clip lim iter is e n ga ge d it ha s a sho rt tim e co nstan t a nd it illum ina te s b riefly.
• If th e clip lim iter is n o t en ga g ed it h as a n increa se d tim e con stan t a nd illu min ates fo r a lon ge r p erio d .
T he rem a in in g yello w L ED s in d icate if an y p ro tection circu its are a ctiva te d. Th ese a re d e scrib ed o n p ag e 1 5.
9 PR O TE C T I O N FE A T UR E S
E ach Ma rtin A ud io a m plifier h as ma ny ad va nce d pro te ctio n fea tures, p ro te cting b o th th e am plifier an d th e
lou dspe a ke rs co nn ected to it, sh ou ld a fa ult con d itio n a rise . U nd er no rm a l use the se fe ature s are ina ud ible. All
p ro te ction circuits op era te ind e pe nd e ntly.
All material © 2007. Martin Audio Ltd. Subject to change without notice.
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