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5. Fan grille filter
A foam filter is located behind the front panel grille to prevent dust entering
the amplifier.

6. Power switch
This is used to power up the amplifier. 
(See page 7 and 14)

4.2

The rear panel

Figure 2. Rear panel

1. Speakon connector
This type of speaker connector may be unfamiliar to some users. A full
description is found in the operation section. (See page 11).

2. Minimum load selector (MLS™) switch
This switch is used to select the minimum nominal speaker impedance the
amplifier is going to drive. A LED indicator illuminates when the 2 ohms
position is selected (see page 11).

3. Clip limiter switch
Turns the clip limiter on and off. (See page 16).

4. Input jack
Alternative to using input XLR or for linking inputs with other amplifiers.
(See page 9).

5. Input signal XLR (See page 8)

6. Polarity reverse switch for channel B
For reversing the input signal polarity of channel B to allow bridged
operation. (See page 12).

7. Input link switch
Allows a single input to drive both channels simultaneously. (See page 12).

8. Gain select switch
Allows amplifier gain to be switched between 32dB (1.45Vrms input
sensitivity) and 37.5dB gain (0.775mV input sensitivity). (See page 14).

9. AC power cable  (See page 6).

Martin Audio – MA1.6 Power Amplifier

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GUIDES

Summary of Contents for MA1.6

Page 1: ...Input connections 8 5 7 Connecting speakers 11 5 8 Impedance matching MLS switch 11 6 OPERATION MODES 12 6 1 Stereo operation 12 6 2 Tandem mono 12 6 3 Bridged mono 12 6 4 Stereo reverse 13 7 OPERATIO...

Page 2: ...any other voltage source such as battery mains source or power supply regardless of whether the amplifier is turned on or off Do not run the output of any amplifier back into another channel s input...

Page 3: ...roduct uses radio frequency energy and if not used or installed in accordance with these operating instructions may cause interference to other equipment Compliance with the EMC directive does not aut...

Page 4: ...r illuminates if the amplifier attempts to function above its maximum operating temperature 90 C The indicator first comes on as a warning to either turn down the input level or check the cooling arra...

Page 5: ...luminates when the 2 ohms position is selected see page 11 3 Clip limiter switch Turns the clip limiter on and off See page 16 4 Input jack Alternative to using input XLR or for linking inputs with ot...

Page 6: ...upply in front of the amplifier and that the rear of the amplifier has sufficient space to allow the exhaust to escape If the amplifier is rack mounted do not use covers or doors on the front or rear...

Page 7: ...nd for reference otherwise a current loop is formed via the signal ground Use the balanced input to avoid hum and interference 5 5 Power consumption There are three ways to define the power current co...

Page 8: ...ast the current at 1 8 power or 1 3 power for heavy duty demand like discos etc The heat power can be calculated as the following example If we consider a headroom of at least 9dB and a 4 ohm load on...

Page 9: ...isy chain use the TRS jacks provided on each channel The input circuits also have high enough headroom to accept the maximum output level from virtually any low level signal source Figure 5 Rear panel...

Page 10: ...onnected to the shield at the source The hum and noise rejection for the cable is equivalent to that for a balanced line To minimize hum in the audio use balanced inputs whenever possible Figure 8 Bal...

Page 11: ...ember that the speaker cable robs the power of the amplifiers in two ways It increases the load impedance and introduces resistive power losses 5 8 Impedance matching MLS switch The MLS switch is loca...

Page 12: ...in parallel 6 3 Bridged mono To bridge the amplifier depress the Link switch 7 and Phase reverse switch 6 Both channels are then driven by a single signal at either input You can use any remaining inp...

Page 13: ...channel B to speaker positive terminal Figure 11 Stereo reverse mode Channel A output is connected as in the normal stereo mode By having channel A and B operating in opposite polarity the energy stor...

Page 14: ...his is known as the soft start or slow start sequence The fans then blow at high speed before going into idle and the two bottom green LED s illuminate to show the amplifier is operational 7 3 Input a...

Page 15: ...Each MARTIN AUDIO MA Series amplifier has many advanced protection features that will protect both the amplifier and the speakers connected to it should a fault condition arise Under normal use these...

Page 16: ...protection will be re initiated Thermal protection starts when the heatsink reaches a temperature above 90 C VHF protection If a signal of more than 12kHz at full power is detected at the amplifier ou...

Page 17: ...mounted directly onto a copper heat sink thereby avoiding thermal losses normally found when using mica washers The heat sink is mounted horizontally in front of a pressure chamber and the air flow is...

Page 18: ...n their output impedance producing uncontrollable speaker cone movement MARTIN AUDIO SMPS produces its rated power output at all frequencies regardless of speaker demands and AC line conditions Minimu...

Page 19: ...ts and bursts up to 1kV conducted through the cables to the unit Electromagnetic fields up to 3V m radiated on the unit and the cables in the frequency range of 27 500MHz We have extended the tests in...

Page 20: ...t AC operation only For use on 115 Volts AC internal modifications to the power supply board must be made Warning This modification should only be carried out by an experienced service technician Plea...

Page 21: ...If it is remove possible high frequency oscillations from the relevant input Fault The amplifier goes into thermal protection when driven at low level Check that your loudspeaker has not got a short c...

Page 22: ...ng accidents act of God war civil insurrection misuse abuse operation with incorrect AC voltage operation with faulty associated equipment exposure to inclement weather conditions and normal wear and...

Page 23: ...at 1kHz and 750W 4 ohms 0 01 DIM 30 at 400W 4 ohms 0 008 CCIF 13 and 14kHz at 200W 4 ohms 0 008 SMPTE 860Hz and 7kHz at 400W 4 ohms 0 01 POWER MATRIX MLS SWITCH SETTING LOAD CONFIGURATION 4 ohms 2 ohm...

Page 24: ...kinghamshire HP12 3SL England Telephone 44 0 1494 535312 Facsimile 44 0 1494 438669 Web www martin audio com E mail info martin audio com The Martin Experience MARTIN AUDIO L O N D O N Please Click he...

Page 25: ...MARTIN AUDIO L O N D O N The Martin Experience ENGLISH MA1 6 Power Amplifier User s Guide CONTENTS PRINT GUIDES...

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