Martin Audio MA2.8s handleiding

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Handleiding

Martin Audio – MA2.8s Amplifier

ENGLISH

5.4.1 T p9-he M LS ¸¸

¸¸

te ch no log y :

MLS swi tch es on rea r p an e l

5.4.2 T p9-he p ro b le m:

If yo u a ssum e tha t a p ow e r

a mp lifie r ca n d elive r 10 0 0

w atts in to 8 oh ms, a nd is

d esig ne d to b e ab le to ru n in to

2 o hm s. Th eo retically, it

sho uld b e ab le to d e live r 4 00 0

w atts in to th e 2-oh m loa d .

V ery fe w p ro fession a l po w er

a mp lifie rs a re ab le to d o this,

a s all con ve n tion al po we r

a mp lifie r de sig ns a re a

com prom ise b e tw ee n p ow er

d issipa tio n, co sts, size etc.

M ost am p lifie rs can de liver o nly 7 0% or less o f the ir th eo re tical

p ow er in to 2 oh ms. T his is du e to re sistive lo sse s in th e po w er

sup ply a nd th e use o f cu rre nt limitin g to p rotect the o u tp ut

sem icon d ucto r d evice s.

5.4.3 T p9-he s olu tion :

T p9-he solu tion is to u se a “C on sta nt P o we r Co n ve rte r”. Th e

con ve rte r is co nn ected b e tw ee n the p o we r su p ply a nd the line a r

p ow er a m plifier. Th e m ain fea tu re of th e Co n stan t P ow er Co nve rter is tha t it ca n p ro d uce mo re cu rre nt th an it takes

fro m th e p ow e r su pp ly, a n d th is wa y o ve rcom e s th e losse s in the p ow e r su p ply wh e n driving lo w im p ed an ce s. As

p ow er is the prod uct o f curre nt an d volta ge , a n incre ase in curre nt re qu ire s a red uctio n in vo lta ge . Th is re d uction in

volta ge also ca uses th e d issipa tio n in th e o utpu t d evice s to be low e r. T h e cu rre nt limit pro te ction thre sh old can b e

a djuste d for a mu ch high e r cu rre nt, so it ca nn ot in te rfe re w ith the re qu ire me nt by th e lo ud spe ake r im pe d an ce cu rve.

6 I NS TA LL A TI O N

6 .1 M o u n t in g

T p9-he a mp lifie r is tw o rack u nits high (2 U) a n d we igh s 10 K g (2 2 lb s) a n d will mo un t in a sta nd a rd E IA 19 ” rack. Am plifiers

m ay b e sta cke d dire ctly o n to p o f ea ch othe r. Th e re is n o ne e d fo r spa cin g be tw e en u n its. If it is th e inten tio n to fill a

rack with am p lifiers, we re co mm e nd ra ckin g is started from the bo tto m of th e ra ck. It is also re co m me nd e d th at re ar

sup po rts a re used fo r am p lifiers m ou n te d in th e m id dle o f th e rack, espe cia lly if use d as p a rt o f a p ortab le system .

6 .2 C o o li n g

Y ou r am p lifie r uses a fo rce d air coo lin g syste m to ma in tain a low a n d eve n op era ting te mp era tu re . A ll fa n co o le d

M AR TIN A UD IO MA series a m plifie rs ha ve fron t to rea r co o ling . N ever try to re ve rse th e dire ction of a irflo w, as the

a mp lifie r ne e ds a p ressu re ch am b er b e tw ee n the fa ns a nd th e interna l h ea t sin k a nd th is o nly o pe rates in o ne

d irectio n of th e airflow .

M ake su re th e re is a de qu a te a ir su pp ly in fron t o f th e a mp lifie r, a n d th a t th e rea r o f th e a mp lifie r ha s sufficie nt sp ace to

a llow th e exh au st a ir to esca

e . If the a m

lifie r is ra ck mo u nted

d o no t u se co ve rs or d oo r o n the fro n t or re ar o f the

Type of mode Pow er /Impe da nce

C h.A C h.B

C on ve ntion al mo de 1 10 0/8 1 10 0/8

1 50 0/4 1 50 0/4

1 70 0/2 1 70 0/2

H ig h vo lta ge mo de 9 4Vrms 9 4Vrms

1 10 0/8 1 10 0/8

6 50 /1 66 50 /1 6

L oa d ma tch in g 1 30 0/8 1 60 0/4

2 30 0/4 2 40 0/2

8 20 /8 8 30 /4

Pow er s h ar in g 3 20 0/2 1 66 0/2

3 20 0/2 2 30 0/4

3 20 0/2 1 30 0/8

L imited po we r 1 66 0/2 5 20 /8

2 00 0/2 8 20 /8

1 00 0/4 1 00 0/4

Bi- amp mod e3 20 0/2 2 30 0/4

2 30 0/4 1 30 0/8

1 30 0/8 6 50 /1 6

2 30 0/4 8 30 /4

Tab le 2

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.