Technical Specifications
INPUTS AND PROCESSING
MIC
Line
UNITS
Input figures quoted at maximum front panel gain control setting.
Low gain High gain Low gain High gain
INPUTS;
XLR connector. Balanced, Suitable for up to 600Ω microphones or line level.
Input impedance
Sensitivity
Overload
Phantom (via 680Ω source)
8700
-62
-24
12
8700
-77
-39
12
8700
-37
+1
-
8700
-52
-14
-
Ω
dBu
dBu
Vdc
AGC;
Compression of signal in dB shown on six front panel LEDs
Input range
Output range
Min. input level for AGC
Attack time
Decay time
>36
±1
Depends on input mode used (see sensitivity)
8
2
dB
dB
ms
s
METAL LOSS CORRECTION;
Specially designed adjustable filter to compensate for
the effects of metal loss. Gain @ 1kHz remains constant
Min. slope
Max. slope
0
+3
dB/oct.
dB/oct.
PHASE SHIFT;
The loop outputs can be configured for phased array systems by
selecting the appropriate rear panel switch option. Phase shift between outputs:
Phase shift off
Phase shift on
0
90
°
°
SLAVE IN;
6.35mm jack. Input for linking more than one amplifier. Inserting plug
disables other inputs.
Input impedance / channel
Input level / channel
MLD7
MLD7
MLD9
UNITS
N/A
N/A
N/A
N/A
Ω
Vpk
100k
1.5
OUTPUTS
MLD5
MLD7
MLD9
UNITS
SLAVE OUT;
Processed audio signal output. Post AGC, MLC and Phase shift. For
linking to another amplifier.
Source impedance / channel
Output level / channel
N/A
N/A
N/A
N/A
220
1.5
Ω
Vpk
LOOP OUTPUT;
(per channel); NL4 speakon. 1 per channel.
Voltage peak/RMS
Current peak/RMS into single turn loop.
Absolute maximum short term peak current.
THD +N (@1kHz full output)
Output impedance
Frequency response (±1.5dB no AGC)
Output current indicated via six front panel LEDs (per channel) at 3 dB intervals.
Bipolar PPM style circuit
Attack
decay
14.5 / 10
7 / 5
>10
<0.2
22
100 to 5000
4.7
1
24 / 17
9 / 6.4
>13
<0.2
22
100 to 5000
4.7
1
45 / 32
13 / 9.2
>19
<0.2
24
100 to 5000
4.7
1
V
A
A
%
Ω
Hz
ms
s
STATUS SOCKET;
2 pin 5mm pitch 90° header. The status socket consists of a pair
of isolated contacts.
Amplifier or load fault
Amplifier and load OK
Contact rating
Dielectric strength (coil – contact)
Open
Closed
DC 2A, 28V, 60W
AC 0.5A, 125V, 60VA
1000Vac 50/60Hz
DC POWER SOCKET;
2 pin 5mm pitch 90° header. The DC POWER socket is used
to power a variety of Ampetronic accessories.
Output voltage
Output current (max.)
12
0.1
12
0.1
12
0.1
V
A
PROTECTION FEATURES
MLD5
MLD7
MLD9
UNITS
CLIPPING;
Clipping of either output is shown on the front panel CLIP LEDs. If clipping
persists amplifier will shutdown and restart.
Clip threshold (% of peak output voltage)
93
93
93
%
OUTPUT DC OFFSET;
If DC offset is detected amplifier will shutdown and restart
Threshold
±0.7
±0.7
±0.7
Vdc
TEMPERATURE;
Internal heatsinks are monitored. If temperature reaches set limits
the output current is reduced and eventually muted. MLD7 & 9 have separate inde-
pendent systems for each channel, MLD7 has a single control for both channels.
Output current reduction (3dB max)
Output mute (illuminates TEMP LED)
Any of the above faults also cause the status relay contacts to open.
Commences 88, max @ 92
92 (output returns at approx. 60)
°C
°C
LOOP RESISTANCE TESTING;
Checks the resistance of the load on startup (The
POWER LED flashes during this period) and only allows operation if within limits. The
LOOP LEDs are illuminated if loads are outside limits
Startup time
Lower limit
Upper limit
Upper limit (link removed)
8 approx.
0.3
5
No limit
8 approx.
0.3
5
No limit
8 approx.
0.5
5
No limit
s
Ω
Ω
OUTPUTS
SLAVE IN;
6.35mm jack. Input for linking more than one amplifier. Inserting plug
disables other inputs.
Input impedance / channel
Input level / channel
MLD5
MLD7
MLD9
UNITS
N/A
N/A
N/A
N/A
100
1.5
kΩ
Vpk
Ampetronic MLD7 Installation Handbook
Page 11
