Martin Audio MA2.8s handleiding

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Handleiding

Martin Audio – MA2.8s Amplifier

ENGLISH

5 R E A R PA N E L FE A T UR E S

5 .1 G a i n s w i t c h

T p6-he g ain switch loca te d o n th e rea r p an el (the ce ntra l D IP -sw itch ) cha ng e s th e g ain/inp ut se nsitivity o f the am plifier.

T his ca n b e u se fu l w p6-he n u sing lo w or high n o mina l inp ut sign a ls. Mo st pro fe ssio n al m ixing co nsole s op era te a t a

n om in al le ve l o f +4 to + 6 d Bu ; th e 3 2d B g ain p osition e nsu re s the re is p le n ty o f fad er mo ve me n t ava ilab le . F or se mi

p ro fe ssion al mixing de sks o pe ra tin g a t a no m in al le ve l o f 0d B o r -1 0 dB th e high e r ga in se tting s o f th e a mp lifie r ca n b e

u se d.

T p6-he D IP -sw itch

D iffe re n t ga ins a nd fu nctio n ca n b e selecte d for ch an ne l A a n d B, b y

a pp ro priate setting of th e DIP switch . Se le cting th e ma xim um ga in o f the

a mp lifie r is alwa ys a tra de o ff be tw e en n oise an d h ea dro om . A low g a in

a mp lifie r am p lifies le ss of the no ise o f th e p re ced in g e qu ip m en t (m ixe r,

cro ssove r, e q ua lize r e tc.). A h igh er in pu t level is the n req u ired to a tta in full

p ow er o u tp ut, so th e h ea d ro om w ill b e d ecre a se d o n mixe r o r cro ssove r

o utpu ts. In a n actively d rive n syste m the re is u sua lly a d ed ica te d lou dsp ea ke r

p ro ce sso r or co ntro lle r, fo r th e lou d sp ea ke r system . Mo st lo u dspe ake r

m an ufacturers recom m en d a spe cific g a in for th e a mp lifie rs fo r use w ith the ir

con trollers.

5.1.1 G ain

T p6-he re a re eig ht p osition s o f ga in se lecta ble , fro m 20 dB to 4 1 dB in 3 dB step s. T h e diffe re nt se tting s fo r the DIP-

switche s a re listed in th e ta ble b elo w. T p6-he th re e switch es to the ve ry le ft a re fo r cha nn el B, a n d th e three to the ve ry

rig ht a re fo r cha nn e l A. Th e tw o switch es in the midd le se le ct th e o pe ra tin g mo d e of th e am p lifie r, S te reo o r L in k

/Brid ge A+ B.

5.1.2 S en sitiv ity

S en sitivity is th e level in volts (rms) or d Bu (re ferre d to 0.7 75 Vrm s) tha t is req uire d to

o btain full o utpu t p ow er. A s th e o utp ut p ow e r va rie s with th e loa d imp ed a nce, u sua lly 4

o hm s is usua lly take n as th e re feren ce. B eca use the M A2 .8s is e qu ip p ed w ith a n M LS -

switch the re are nu m erou s varia tio ns of o utp ut p o we r ve rsu s sen sitivity versu s loa d

imp ed an ce.

W e re co m me nd ca lcula ting th e se n sitivity if th is is n ece ssary.

A s a gu ide th e ta ble b elo w give s the in pu t level in volts rms versus g a in for fu ll po we r

o utpu t @1% thd 1 KH z sin e w ave, ML S switche s in p ositio n 0 dB

G ain dB 2 0 2 3 2 6 2 93 23 53 84 1

Inp ut d Bu + 21 .6 + 18 .6 + 15 .6 + 12 .6 + 9 .6 + 6 .6 + 3 .6 + 0 .6

Inp ut V rms 9 .4 0 6 . 6 5 4 . 7 0 3 . 3 4 2 . 3 6 1 . 6 7 1 . 1 8 0 . 8 4

5.1.3 O ptio ns

A s th e D IP -sw itch is rece ssed , a sticke r ca n b e p la ce d a cross the cu t ou t to pre ve nt un au th o rize d tam pe rin g. An othe r

o ptio n is to re mo ve th e D IP -switch . T his sh o uld o nly be do ne by a uth orize d se rv ice p e rs on ne l T his co rre sp o nd s

to all switch es set to “o ff ”, i.e . 3 2d B ga in an d ste re o m od e .

5 .2 L in k s w i t c h

T p6-he L in k switch loca te d o n th e rea r p an el (the ce ntra l D IP -sw itch ) is fo r cha ng ing th e op era ting mo de o f the am plifier

(se e be low , section 5.3).

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.