Martin Audio – MA200Q Amplifier
ENGLISH
10
O nc e co n ne cte d to a su ita ble AC su pp ly, the amplifier c a n be star te d w ith the p o we r s witc h. Wh en yo u
p ow er u p the amplifier it tak es a co u ple of se co n ds to s elf c he ck ( this is kn ow n a s the " so ft sta rt" or "s lo w
s ta rt" s eq ue n ce ), th e fa n s th en blow at h ig h s pe e d be fo r e go ing into " id le" . Th e fou r b otto m g re e n LED’s
the n illumin a te to s ho w the a mp lifie r is op e ra tio na l.
6.4 Grounding
The re is n o g ro un d lift s witc h o r te r mina l o n th is amplifier . The s ign al gr ou nd is a lwa ys floa tin g (lifted ), with
r es pe ct to c h as sis g ro un d v ia a gr ou n d lift re sis to r. If a p o te ntia l d iffer en ce ab ov e 0 .6 V is de tec te d b etwe e n
s ig na l g ro un d a nd c h as sis e ar th , a s h or t cir cu it is a uto ma tic ally in tr od u ce d be twe en th e tw o , en s ur in g
e le ctric al p r otec tio n. If o th er eq uip me nt o r a mp lifie rs with in a sy s te m s ho uld d ev elo p an e lec tr ica l fa u lt to
e ar th , the ma in s fu s e on th at e q uipme nt s ho u ld r u ptur e d ue to this a utoma tic sy s te m a llow in g a n e ar th
c ur re nt to flow for pr ote ctio n p ur po s es .
If ho we v er y o u wish to p e rman en tly c o nn ec t the s ign al g r ou nd to c ha s sis e ar th , c on ne c t th e XLR -
c on ne cto r’s s he ll lu g to pin 1. In th e in te r es t o f sa fe ty ne v er d is c on ne c t th e e ar th pin on th e mains c a ble.
To co mp ly with CE a p pr ov a l (r ad io in ter fe re n c e ) , t h e r e i s a n A C m a i n s f i l t e r . T h i s f i l t e r n e e d s t h e c ha s sis
g ro un d for r e fe re nc e , oth er wise a cu r re nt lo op is for me d v ia th e sig na l g ro un d.
N ev er disc onnec t (lift ) t he mains sa f et y ea r th.
6.5 Power consumption
There are three ways to determine the power/current consumption of the amplifier:
First, the peak current draw at full power output. Under this condition the amplifier will operate for less
than 2 minutes before thermally limiting or blowing the mains fuse, and is an unrealistic ‘normal’ use
condition. To design a mains distribution system based on the current draw at full power would result in
an over specified system. No music program material requires the full steady state continuous power of
an amplifier, this operating condition is only valid during amplifier bench testing.
Second, the maximum expected average current under worst case program material, which is 1/3 of full
power according to the FTC-standard. At this level normal program music will be in a state of constant
clip and is therefore the highest power level that can be achieved without completely obliterating the
program material.
Lastly, the "normal operating power", as defined by EN 60065 as a measurement level for approval and
testing to this standard. The normal operating power is measured using pink noise, with an average
output power equal to 1/8 of full power. The one-eighth power is the maximum level program music can
be re-played without continuous amplifier clipping, this corresponds to a headroom of only 9dB's, which is
very low for normal program material.
Power 1/3 Power 1/8 Power Idle
[W] note 1 note 2
MA200Q 8 ohms 4x 130 480 300 85
4 ohms 4x 200 720 470 85
2 ohms 4x 270 1065 740 85
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.
MAX OUTPUT POWER MAINS INPUT POWER
(21 pages)
(33 pages)
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