Martin Audio MA2.8s handleiding

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Handleiding

Martin Audio – MA2.8s Amplifier

ENGLISH

9 .1 Ou t p u t Li m i t e r

A n ou tp u t lim iter is includ ed to a vo id am plifier clip pin g. W h en a n a mp lifie r is se ve rely ove rd riven , its o utp ut w ave fo rm

is clip p ed (its p ea ks are squ are d off) – re d ucin g the crest facto r. In e xtrem e cases, the w a ve fo rm ca n a p p r o a c h t h a t o f

a squ are w ave . An a m plifier is n orma lly cap a ble o f prod u cing fa r mo re po w er u nd e r th e se con d itio n s th an its n orma l

u nd isto rte d rated o u tp ut po we r.

T p15-he lim ite r w orks b y m on ito ring th e o utpu t a nd co mp arin g the distortio n p ro du ce d b etw ee n th e inp u t an d o utpu t o f th e

a mp lifie r. If the d istortio n excee ds 1% TH D for a n y re aso n (vo ltag e o r cu rre nt clip pin g), th e lim ite r re d uces th e in p ut

sig na l p ro po rtion ally. N o te tha t, if th e sig na l is disto rted or clip pe d b efore it re a ch es th e am p lifier, the clip limite r w ill n ot

b e activated .

U nd er n o rm al op eration th e clip limiter is ina ud ible. T h e lim iter ca n be tu rn ed “O n” or “Off” by pressin g th e releva nt clip

lim it sw itch . S ee p a ge 5

S om e ma n ufacturers o f lo u dspe ake r pro ce ssors d o n ot reco mm en d the u se of clip limite rs in a m plifiers, a s it can

a ffect the tracking of th e proce ssor's limiters.

If th e a mp lifie r is be i n g u s e d w i t h o u t a n y e x t ern al lim iting , M artin A ud io re co m me nd le avin g the clip limite rs sw itche d

"ON " (b u tton de pressed ).

9 .2 T h e r m a l pr o t e c t io n

W he n th e a mp lifie r is drive n ve ry ha rd in to a lo w imp ed a nce loa d, th e co o ling fa ns w ill run at h igh spe e d. If the se

o pe ra tin g co n dition s con tin ue , the P rotect ind ica to r(s) will illu min ate ind icating th at the am plifier is a bo u t to g o into

the rm al sh utd ow n.

A fter five se co nd s the a m plifie r w ill g o in to th e rm al p rotect b y mu tin g the inp u t sig na l. A fte r 1 5-20 se co nd s the

a mp lifie r will ha ve co ole d do wn en ou g h fo r the a m plifie r to com e ou t o f shu td ow n a nd op erate a s n orma l. If th e lo ad

con ditio ns re ma in u n ch an g ed the th erm al p ro tectio n will be re - initia te d . Th erm al p rotectio n occurs wh e n th e h ea t sin k

tem pe ra ture rea ch es 90

9 .3 VH F p r o t e c t i o n

If a sig na l o f mo re th an 12 kH z, at fu ll p ow e r is de te cte d fo r m ore tha n five se con ds, the V H F pro te ctio n m ute s th e

inp ut sign al. (Th is is ind ica te d o n th e fro nt pa ne l (4 ) b y th e L ED la be le d P ro tect). A fter five se co nd s the o u tp uts w ill u n-

m ute an d retu rn to n orma l o pe ra tio n, un le ss th e o utpu t sig na l h as re ma in e d un ch a ng ed , in wh ich ca s e t h e V H F

p ro te ction w ill re-initia te .

9 .4 Sh o r t c i r c u i t p r o t e c t i o n

A ll M artin A u dio MA Se rie s am plifiers a re co mp le tely sh o rt circuit p ro te cte d. T h e pro te ctio n circuit pe rmits ve ry h igh

p ea k cu rre nts, bu t still ho ld s the o u tp ut d e vice s w ithin the sa fe o p erating a re a . If a sh o rt circuit is ma intaine d , th e

cha nn el affe cte d will eve ntua lly g o into a the rm a l prote ct cycle un til th e sh ort circuit ha s b ee n rem ove d.

9 .5 A C ma in s v o l t a g e pr o t e c t i o n

If th e A C ma ins voltag e is ou tside th e op era tion a l wind o w (o ver o r u nd er vo ltag e ), th e po we r sup p ly w ill a uto ma tica lly

shu t do w n. W h en the ma in s volta g e is ab ove the m inimu m sta rt vo ltag e a nd be lo w its m a ximu m o pe ra tin g vo lta ge th e

a mp lifie r will re sta rt.

T p15-he two gree n ‘ON ’ L ED ’s in dica te wh e n th e p ow er su pp ly is o p eratin g correctly.

It ta ke s a co up le o f seco nd s to se lf-ch eck (th is is kno w n as th e "so ft start" o r "slo w start" se q ue nce), the ga in w ill

slo wly a nd g rad ua lly b e incre ase d ba ck to th e pre viou sly set le ve l, an d the fan s w ill b lo w a t hig h sp ee d b efo re g oin g

into "id le ".

9 .6 D C . p r o t e c t i o n

T p15-he re a re tw o typ es of D C p ro te ction :

• F uses o n the su pp ly bran che s of ea ch ch an ne l.

• D C crow b ar p rotectio n th a t sh orts th e o utpu t if m ore th a n 10 vo lts D C are b eing de te cte d on th e o utpu ts.

B oth th e se circuits co me in to e ffe ct on ce a DC le ve l ha s b ee n d etected o n e ithe r cha n ne l.

CONTENTS

GUIDES

Bekijk gratis de handleiding van Martin Audio MA2.8s, stel vragen en lees de antwoorden op veelvoorkomende problemen, of gebruik onze assistent om sneller informatie in de handleiding te vinden of uitleg te krijgen over specifieke functies.