Martin Audio MA900 - SCHEMATICS, User Manual, Page: 10 / 19

Martin Audio – MA900 Amplifier
E
NGLISH
10
The heat power produced is the difference between the power consumption and output power;
370 - 80 = 290 watts total for the amplifier.
MA900 HEAT POWER
1/3 POWER 1/8 POWER 1/3 POWER 1/8 POWER 1/3 POWER 1/8 POWER
WATTS Kcal/hour BTU/hour
8 Ohm 307 235 260 200 1050 800
4 Ohm 453 370 390 320 1550 1260
2 Ohm 705 605 610 520 2410 2060
1/3 Power level = Average power with music as programme source. The amplifier driven to clip level
1/8 Power level = Normal operating power with music as programme source, 9dB headroom
7 CONNECTIONS
7.1 Input connections
7.1.1 Balanced inputs
T he inp u t co n ne ctors a re N eu trik co mb o jacks an d incorpo rate a n XL R a nd _ " (6.3m m ) ja ck. T he y a re active ba la n ce d
a nd w ired :
P IN 1 G RO UN D/S HIEL D
P IN 2 H OT (+)
P IN 3 C OL D (-)
XLR input connector
XLR balanced
T IP H OT
R IN G C OL D
S LE EV E S HIEL D/G RO UN D
_” TRS plug
Th e inp ut
im pe dan ce is
high en oug h
(2 0 K o hms
ba la nce d) to
allo w ”daisy-
ch ainin g”, o r
mu ltiple p arallel
in pu t
co nn ection s.
Th e hea dro om of th e inp ut circu its is a lso h igh en ou gh
to a cce pt th e m aximu m o utp ut le vel from virtually an y
lo w-level signa l sou rce . B alanced signa ls are less
se nsitive to AC hu m and ra dio inte rfere nce . The
so urce imp ed ance sho uld be less th an 1 Ko hm s to
avoid h igh freq uen cy lo sse s in lon g cab les.
To daisy chain amplifiers, use the screw -te rm ina l
(P ho enix con nector), la beled Link, provided o n e ach
ch an nel. It is con ne cte d in parallel with th e Ne utrik
Co mb o jack o n e ach inpu t.
All material © 2007. Martin Audio Ltd. Subject to change without notice.