Martin Audio – MA2.8s Amplifier
ENGLISH
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5 .3 O p e r a t i n g mo d e s
5.3.1 S te re o m od e
In th is co nfigu ra tio n, b o th cha n ne ls op erate ind e pe nd en tly o f e ach o th er. T his is use d
for a ll 2-ch a nn el o p eration s, e .g. b i-a mp a n d ste re o. S tereo mo de is sele cted b y p la cin g
the two ce ntral switch es in the off p ositio n (Do w n). Th e a tte nu ators o n the fro n t pa n el
con trol th e respe ctive ch an ne ls le ve ls.
N ev er c o nn ec t e ithe r o utp ut term in al to g ro u nd o r in pa ralle l. T he re co mm e nd ed
m in im um no min al imp e da nce , fo r ste re o o r ta n de m o pe ra tio n, is 2 o hm s p er ch an ne l.
5.3.2 N otes fo r am p lifier te sting
N OT E: C h an ne l B is a lw ays p olarity re v e r s e d on th e in pu t, an d p olarity re ve rsed ba ck on the ou tp u t. O n cha nn e l B th e
p ositive o utp ut voltag e w ith re spe ct to 0 V a pp ea rs on p in -2 of the S pe akon co nn e ctor. Ch an n el A is con n ecte d w ith
n orma l p olarity. By ha vin g ch an n el A an d B o pe ra tin g in op po site po larity, th e e ne rg y sto ra g e in th e po w er su pp ly is
m ore efficie n t. T his is sig nifican t for sig n als b elow 1 0 0 Hz (sub b a ss e tc.) an d imp roves th e po w er b an d width . B e su re
to us e b alan c ed inp u ts o n a ll m e as uring e qu ipm en t (in clu ding os cillo sc op e p ro be s ) if yo u are b en c h te sting .
R everse op era ti on o f C ha n ne l B.
5.3.3 T an de m m od e
In ta nd e m mo d e ch an n el A in pu t is lin ke d to ch an n el B in pu t, eith er in pu t socke t m ay th en b e u se d to pro vide th e in p ut
sig na l T an de m m od e is activated by p lacin g the tw o ce ntral sw itch es (4 a n d 5) in the “O N” p o sitio n (U P). B oth inp ut
a tten ua tor’s are active, allo win g yo u to se t d ifferen t levels for e a ch ch an ne l. No te th at o n ly th e in pu ts are con ne cte d in
p aralle l. Th is is N O T a p aralle l o utp ut m od e . N ev er c o nn ec t e ithe r o utp ut term in al to g ro u nd o r in pa ralle l.
Y ou can use the rem a in in g inp ut co nn e ctors to pa ralle l o ff “D aisy – ch ain ” sign a ls to o th er am plifiers.
N OT E: A lwa ys tu rn o ff th e L in k s witc h w he n u sing th e am p lifie r fo r B i-am pin g.
5.3.4 B ridg e m on o m od e
B ridg e m on o m od e is used to d elive r incre ase d po w er to the
lou dspe a ke rs. U sing th e M A2 .8 s in bridg e mo d e re d uces th e nu m be r of
cha nn els fro m two to o ne . T he n o mina l imp ed a nce o f th e loa d m ust be
m ore th a n 3 o hm s. S e t th e L in k/b ridg e switch es to the “O n” p o sition (U P)
a nd u se eith e r of th e in p ut con n ecto rs A or B. Y o u ca n u se th e re ma ining
inp ut co nn ectors to ca rry a p ara llel sign al to o the r am p lifie rs. Bo th A a nd B
level a tte nu a to rs m u st b e in th e sam e p osition . W e re co m me nd th ey a re
u se d in th e 0 dB fully clo ckwise po sitio n.
T he lou d sp ea ker sho u ld n o w be co nn ected to cha nn e l A o utpu t S pe akon .
(+1 sho u ld b e con ne cte d to th e [+] te rm in al of th e lo ud spe ake r, a nd –2 to
the [-] te rm ina l of th e lou dspe a ke r)
5.3.5 B ridg e m on o m od e fe a tu re s
B ridg ed mo no mo de co mb in e s th e p ow er of two ou tp u t ch an n els into on e .
T his re sults in twice th e volta g e sw ing , fo u r tim es the pe ak po we r a nd ju st
less th a n th ree tim e s th e full p ow er of a sing le ch an ne l.
All material © 2007. Martin Audio Ltd. Subject to change without notice.
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