Martin Audio – MA2.8s Amplifier
ENGLISH
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m ains d istrib utio n syste m b ased on th e cu rre nt d raw a t full p ow er w o uld result in an over sp ecified system . N o mu sic
p ro gram m e ma teria l req uires the fu ll stea dy state con tin uo us po we r o f an am plifier, this o pe ra tin g co n ditio n is o n ly
valid fo r am p lifier be nch testin g.
S ec on d, th e ma xim um expe cte d ave ra ge cu rren t u nd er wo rst-case p ro gra m ma te ria l, wh ich is 1/3 o f fu ll po w er
a ccordin g to th e FT C -sta n da rd . A t th is le ve l the mu sic w ill b e in a state o f co n stan t clip a nd is the re fore the h ig h est
p ow er le ve l tha t ca n b e o btaine d w ith ou t co m plete ly o blite ra tin g th e p ro g ra m ma teria l.
L as t, the "n orma l o pe ra tin g p ow er", as d e fine d b y EN 60 06 5, IE C 6 5/AN SI/UL 6 5 00 a s a m ea surem en t leve l fo r
a pp ro va l a nd te stin g to the se stan da rds. Th e n orm al o pe ratin g p ow er is m e asured usin g p in k n oise , w ith a n ave ra ge
o utpu t p ow er eq ua l to 1/8 o f fu ll po w er. Th e o ne -eigh th po we r is th e m aximu m le vel m u sic ca n b e re-playe d witho ut
con tinu o us a m plifie r clip ping ; this corre sp o nd s to he ad roo m o f on ly 9d Bs, w hich is ve ry low fo r n orma l p ro gra m
m ateria l.
6.7.1 C alcu la tio n
T he c urren t d ra w ca n be ca lcu la te d b y divid in g the m a in s in p ut p o we r by th e m ains vo ltag e .
W e re co m me nd yo u to de sig n th e p ow er distrib utio n for a t lea st th e curre n t at 1 /8 po w er, an d 1 /3 po we r for h e avy-
d uty de m an ds su ch a s con cert to u ring an d in d ustrial m usic etc.
T he h ea t p ow e r ca n be ca lcu la te d a s fo llo ws:
If a he a droo m fig ure o f a t le ast 5 dB (1 /3 o f full p ow er) is u se d with a 4 o hm s loa d o n ea ch ou tp u t of th e a mp lifie r.Th e
1 /3 p ow e r pe r cha nn e l is th en ; 1 50 0 / 3 = 5 0 0 wa tts, an d the to ta l o utpu t p ow er = 2 x 5 00 = 10 00 wa tts.
T he p ow e r co n su mp tio n according to th e ch art a bo ve is th en 1 4 40 wa tts.
T he h ea t p ow e r prod u ce d is the diffe re nce b etwe e n th e p ow er co nsum p tion an d ou tpu t p ow er;
1 44 0 - 1 00 0 = 4 40 w a tts total fo r th e a mp lifie r.
M A2 .8 s H EA T P OW ER
1 /3 P OW E R 1 /8 P OW E R 1 /3 P OW E R 1 /8 P OW E R 1 /3 P OW E R 1 /8 P OW E R
WA TT S K ca l/h ou r BT U/h ou r
8 Oh m 3 27 25 5 2 80 22 0 1 1 20 8 70
4 Oh m 4 40 31 0 3 80 27 0 1 5 00 1 0 60
2 Oh m 5 87 42 0 5 00 36 0 2 0 00 1 4 30
1 /3 P ow e r le vel = A verag e p ow er with mu sic a s pro gram me so urce. T he am plifier d riven to clip leve l
1 /8 P ow e r le vel = N o rm al op erating p o we r with mu sic a s p ro gra mm e so u rce, 9d B he a droo m
POWER 1/3 Power 1/8 Power Idle
[W] note 1 note 2
MA2.8s 8 ohms 2x 1100 1060 530 115
4 ohms 2x 1500 1440 685 115
2 ohms 2x 1700 720 845 115
note 1 Average power with music as program source. The amplifier driven to clip level.
note 2 Normal music power with 9dB headroom, IEC standard power rating.
MAINS INPUT POWER MAX OUTPUT POWER
All material © 2007. Martin Audio Ltd. Subject to change without notice.
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