Page 1
plus
4-channel power amplifier
212mm (To Fixing Centres)
250mm
236mm
SERIAL No.
~50/60Hz
CHANNEL 1 CHANNEL 2
350W
OUT
IN
GAIN
CHANNEL 1 & 2 BRIDGED CHANNEL 3 & 4 BRIDGED
100-120v~
OUT
IN
GAIN
NORMAL
BRIDGED
220-240v~
OUT
GAIN
CHANNEL 3 CHANNEL 4
IN
CH1
OUT
CH1&2
IN
GAIN
CAUTION!
RISK OF ELECTRIC SHOCK
DO NOT OPEN
TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT REMOVE COVER
Read these instructions.
Keep these instructions.
Heed all warnings.
Follow all instructions.
1. SERVICING
Do not attempt to service this product
yourself as opening covers or panels may
expose you to dangerous voltages or
other hazards. Refer all servicing to
qualified personnel.
Where replacement parts are required be
sure the service technician has used
replacements supplied by the
manufacturer or have the same
characteristics as the original part. Use of
unsuitable parts could cause fire, electric
shock or other hazards and may void any
warranty or guarantee.
The technician must perform any safety
checks to test the performance of the
product upon completion of any repairs.
NO USER-REMOVEABLE PARTS INSIDE
REFER SERVICING TO QUALIFIED PERSONNEL
CH3
CH3&4
CH4CH2
17mm
25mm
12mm
(To Fixing Centres)
channel 1 channel 2 channel 3 channel 4
This symbol indicates that there are important operating and
maintenance instructions in the literature accompanying this unit.
This symbol indicates that dangerous voltage constituting a risk of
electric shock is present within this unit.
2. PRECAUTIONS
WARNING - To reduce the risk of electric
shock do not remove any panels or
covers. There are no user serviceable
parts in this product.
WARNING - To reduce the risk of electric
shock, do not expose this product to rain
or moisture.
READ ALL INSTRUCTIONS before
attempting to install or use the product.
RETAIN INSTRUCTIONS for future
reference.
WATER AND MOISTURE - The product
should be kept away from water, for
example sinks, bath tubs, wet areas and
the like.
OBJECT OR LIQUID ENTRY - Do not
insert any object or liquid into the
openings in the product as this may cause
electric shock or malfunction.
0dB 0dB 0dB 0dB-3 -3 -3 -3-6 -6 -6 -6-12 -12 -12 -12-18 -18 -18 -18
plus
HEAT - The product should be kept away
from any heat sources such as radiators,
stoves or fires.
MOVING/TRANSPORTING THE
PRODUCT - All product should be
packed in its original packaging for moving
from location to location.
OVERLOADING - Never overload mains
outlets, extension cables or multi-way plug
extensions as this may cause fire or
electric shock.
POWER CORD PROTECTION - Power
supply cords must be routed away from
areas where they are likely to be walked
on or squashed by furniture. Also pay
attention to the placement of extension
leads or multi-way extension leads.
LIGHTNING - For added protection of the
product during lightning storms or
extended periods of non use, unplug your
whole system from the mains outlet and
disconnect your antenna. This will protect
your system from damage due to lightning
strikes and power surges.
Page 2
channel 1 channel 2 channel 3 channel 4
0dB 0dB 0dB 0dB-3 -3 -3 -3-6 -6 -6 -6-12 -12 -12 -12-18 -18 -18 -18
plus
a - Channel 1 output level meter. The
red 0dB indicator lights when the limiter
function starts to operate.
b - Channel 2 output level meter. The
red 0dB indicator lights when the limiter
function starts to operate.
SERIAL No.
a
~50/60Hz
350W
CHANNEL 1 CHANNEL 2
OUT
IN
GAIN
b
CHANNEL 1 & 2 BRIDGED CHANNEL 3 & 4 BRIDGED
c
d
c - Channel 3 output level meter. The
red 0dB indicator lights when the limiter
function starts to operate.
d - Channel 4 output level meter. The
red 0dB indicator lights when the limiter
function starts to operate.
g
CHANNEL 3 CHANNEL 4
OUT
IN
100-120v~
GAIN
e
f
NORMAL
BRIDGED
h
220-240v~
GAIN
i
OUT
IN
j
k
e - Power on indicator. This will light
constant blue when the power is on.
f - Power on/off button. This is a true
mechanical power switch (not a
standby mode). Its position is
“remembered" even during mains
power failure.
m
CH1
OUT
CH1&2
IN
CH2
GAIN
n
l
p
CH3
CH3&4
CH4
o
a) Mains power input
b) Channel 1 gain control. Turn anticlockwise to reduce gain and clockwise
to increase gain
c) Channel 1 line level phono input and
paralleled output
d) Channel 2 line level phono input and
paralleled output
e) Channel 2 gain control. Turn anticlockwise to reduce gain and clockwise
to increase gain
f) Channel 1 + 2 mode switch. In the
"normal" position, channels 1 and 2
operate as independent channels with a
4 Ohm minimum load capability. In the
"bridged" position channels 1 and 2
operate as a single high output channel
with an 8 Ohm minimum load capability.
See wiring diagram for connection
details.
g) Mains voltage switch. Ensure that this
switch is set to the correct mains voltage
for your region – failure to do so will
result in damage to the unit and
invalidate the warranty.
h) Channel 3 + 4 mode switch. In the
"normal" position, channels 3 and 4
operate as independent channels with a
4 Ohm minimum load capability. In the
"bridged" position channels 3 and 4
operate as a single high output channel
with an 8 Ohm minimum load capability.
See wiring diagram for connection
details.
i) Channel 3 gain control. Turn anticlockwise to reduce gain and clockwise
to increase gain
j) Channel 3 line level phono input and
paralleled output
k) Channel 4 line level phono input and
paralleled output
l) Channel 4 gain control. Turn anticlockwise to reduce gain and clockwise
to increase gain
m) Loudspeaker output terminals for
channel 1
n) Loudspeaker output terminals for
channel 2
o) Loudspeaker output terminals for
channel 4
p) Loudspeaker output terminals for
channel 3
Page 3
Bridge Mode
Channels 1 and 2 operate as independent channels with a 4 Ohm minimum load capability. In the "bridged" position channels 1
and 2 operate as a single high output channel with an 8 Ohm minimum load capability. See wiring diagram for connection
details.
To bridge channels 1 & 2:
Note: only the channel 1 level meter will operate.
~50/60Hz
CHANNEL 1 CHANNEL 2
350W
100-120v~
OUT
IN
GAIN
CHANNEL 1 & 2 BRIDGED CHANNEL 3 & 4 BRIDGED
SERIAL No.
OUT
IN
GAIN
a
d
a - Apply the input signal to channel 1 only.
Leave channel 2 input disconnected.
b - Connect the loudspeaker/s to the two
terminals as marked on the rear panel
(positive at very top and negative at very
bottom).
To bridge channels 3 & 4:
Note: Only the channel 3 level meter will operate.
~50/60Hz
CHANNEL 1 CHANNEL 2
350W
100-120v~
OUT
IN
GAIN
SERIAL No.
OUT
IN
GAIN
CHANNEL 1 & 2 BRIDGED CHANNEL 3 & 4 BRIDGED
CHANNEL 3 CHANNEL 4
CH3
CH3&4
CH4CH2
220-240v~
NORMAL
BRIDGED
OUT
IN
GAIN
c
OUT
IN
CH1
CH1&2
GAIN
b
c - Set the mode switch for channels 1 & 2 to
bridged position.
d - Gain is adjusted with the channel 1 gain
control only (channel 2 gain control has no
effect)
CHANNEL 3 CHANNEL 4
CH3
CH3&4
CH4CH2
NORMAL
BRIDGED
220-240v~
GAIN
OUT
CH1
OUT
CH1&2
IN
IN
GAIN
h
g
e -Apply the input signal to channel 3 only. Leave
channel 4 input disconnected.
f - Connect the loudspeaker/s to the two
terminals as marked on the rear panel (positive
at very top and negative at very bottom).
e
f
g - Set the mode switch for channels 3 & 4 to
bridged position.
h - Gain is adjusted with the channel 3 gain
control only (channel 4 gain control has no
effect)
Fault conditions:
Under fault conditions such as short circuit, over-current (load impedance too low) and over temperature the level meter for the
affected channels will show no signal (white lights extinguished) and the red "0dB" LED will light indicating protection is
operating. All protection systems are auto-recovering (no latching of faults) so that normal operation resumes as soon as the
fault condition is removed.
Please note that the protection systems are shared in pairs, channels 1 & 2 are paired and channels 3 & 4 are paired. Hence
under a fault condition on channel 1, for example, both channels 1 & 2 will be shut down until the fault is cleared. Likewise, a
fault on channel 4 would result in channels 3 & 4 shutting down etc.
Limiter operation:
The amplifier has a separate limiter for each channel and this has been carefully balanced to provide protection against clipping
whilst still allowing the full output potential to be realised with music signals. Under conditions which would normally cause the
output to clip the limiter will automatically reduce the gain to prevent audible distortion. Some momentary clipping of music
transients will occur but this is generally inaudible and allows the perceived loudness to be greater than if all clipping were
strictly eliminated.
The limiter provides valuable protection for both the loudspeakers and the listener’s ears under overdrive conditions.
Page 4
Optimising the output of your Microseries System
The following combinations drive the largest number of loudspeakers for the greatest area of coverage and use the 4
Ohm
capability of the MICROplus for maximum output power:
8 MICROdot per channel:
[2 x MICROdot series / 16 ] +
[2 x MICROdot series / 16 ] +
[2 x MICROdot series / 16 ] +
[2 x MICROdot series / 16 ]
Ohm
Ohm
Ohm
Ohm
Wired in parallel =
8 MICROdot @ 4 driven by 80W.
Ohm
MICROdot per MICROplus:
With 4 channels this will give a total of
32 x MICROdot per MICROplus
~50/60Hz
CHANNEL 1 CHANNEL 2
350W
100-120v~
OUT
IN
GAIN
CHANNEL 1 & 2 BRIDGED CHANNEL 3 & 4 BRIDGED
SERIAL No.
OUT
IN
GAIN
4 MICROpoint per channel:
NORMAL
BRIDGED
220-240v~
OUT
IN
GAIN
CHANNEL 3 CHANNEL 4
CH1
OUT
CH1&2
IN
GAIN
CH3
CH3&4
CH4CH2
[2 x MICROpoint series / 8 ] +
[2 x MICROpoint series / 8 ]
Ohm
Ohm
Wired in parallel =
4 x MICROpoint @ 4 driven by 80W.
Ohm
MICROpoint per MICROplus:
With 4 channels this will give a total of
16 x MICROpoint per MICROplus
SERIAL No.
~50/60Hz
350W
CHANNEL 1 CHANNEL 2
OUT
IN
GAIN
OUT
IN
GAIN
CHANNEL 1 & 2 BRIDGED CHANNEL 3 & 4 BRIDGED
100-120v~
NORMAL
BRIDGED
220-240v~
OUT
IN
GAIN
CHANNEL 3 CHANNEL 4
CH1
OUT
CH1&2
IN
GAIN
CH3
CH3&4
CH4CH2
Page 5
2 MICROline per channel:
SERIAL No.
~50/60Hz
350W
CHANNEL 1 CHANNEL 2
OUT
IN
GAIN
OUT
IN
GAIN
CHANNEL 1 & 2 BRIDGED CHANNEL 3 & 4 BRIDGED
100-120v~
NORMAL
BRIDGED
220-240v~
OUT
IN
GAIN
CHANNEL 3 CHANNEL 4
[1 x MICROline / 8 ] +
[1 x MICROline / 8 ]
Ohm
Ohm
Wired in parallel =
2 x MICROline @ 4 driven by 80W.
Ohm
MICROline per MICROplus:
With 4 channels this will give a total of
8 x MICROline per MICROplus
CH1
OUT
CH1&2
IN
GAIN
CH3
CH3&4
CH4CH2
If less speakers are required, the 8 capability of the MICROplus may be the best solution. Ohm
4 MICROdot per channel:
SERIAL No.
~50/60Hz
350W
CHANNEL 1 CHANNEL 2
100-120v~
OUT
IN
GAIN
OUT
IN
GAIN
CHANNEL 1 & 2 BRIDGED CHANNEL 3 & 4 BRIDGED
NORMAL
BRIDGED
220-240v~
OUT
IN
GAIN
CHANNEL 3 CHANNEL 4
[2 x MICROdot series / 16 ] +
[2 x MICROdot series / 16 ]
Ohm
Ohm
Wired in parallel =
4 MICROdot @ 8 driven by 40W.
Ohm
MICROdot per MICROplus:
With 4 channels this will give a total of
16 x MICROdot per MICROplus
CH1
OUT
CH1&2
IN
GAIN
CH3
CH3&4
CH4CH2
Page 6
2 MICROpoint per channel:
~50/60Hz
CHANNEL 1 CHANNEL 2
350W
100-120v~
OUT
IN
GAIN
CHANNEL 1 & 2 BRIDGED CHANNEL 3 & 4 BRIDGED
SERIAL No.
OUT
IN
GAIN
1 MICROline per channel:
NORMAL
BRIDGED
220-240v~
OUT
IN
GAIN
CHANNEL 3 CHANNEL 4
[2 x MICROpoint in series = 8 ]
Ohm
=
2 x MICROpoint @ 8 driven by 40W
Ohm
.
MICROpoint per MICROplus:
CH1
OUT
CH1&2
IN
GAIN
CH3
CH3&4
CH4CH2
With 4 channels this will give a total of
8 x MICROpoint per MICROplus
[1 x MICROline / 8 ]
Ohm
=
Ohm
SERIAL No.
~50/60Hz
350W
CHANNEL 1 CHANNEL 2
OUT
IN
GAIN
OUT
IN
GAIN
CHANNEL 1 & 2 BRIDGED CHANNEL 3 & 4 BRIDGED
100-120v~
NORMAL
BRIDGED
220-240v~
OUT
IN
GAIN
CHANNEL 3 CHANNEL 4
1 x MICROline @ 8 driven by 40W.
MICROline per MICROplus:
CH1
OUT
CH1&2
IN
GAIN
CH3
CH3&4
CH4CH2
With 4 channels this will give a total of
4 x MICROline per MICROplus
Notes:
1) Remember, a MICROzone is required in every Audica Professional system to provide the correct EQ and filtering for
MICROseries loudspeakers. The MICROzone + MICROplus combination provides a powerful BGM or AV system and you can
still use the two amplifier channels of the MICROzone to drive further loudspeakers. The MICROzone is also providing all control
and input functions and Sub output. The MICROplus is a straight gain amplifier with no EQ, so connects to the MICROzone’s
‘Line Out EQ’ output.
2) In any series/parallel combination, always aim to raise impedance with the series pairs as a first consideration. This means
that in the event of any loudspeaker failure only one series pair will be lost and the remaining parallel impedance load on the
amplifier is increased and the amplifier is not subjected to a lowering of impedance which could cause it to operate its protection.
3) Any combination of the above ‘per channel’ suggestions can be used to provide mixed MICROdot, MICROpoint, MICROline
systems. Do not mix different speaker types in any series connected speakers.
4) These suggestions are a guide for maximum system output. For background music this will often be well above the required
sound level. Always consider the application requirements first, calculating the number and position of loudspeaker needed and
the level they need to operate at. Then calculate the amplifier power/loudspeaker combination required
Page 7
Installation
Page 8
Specification
Normal Mode (per channel):
Programme power output: 80W into 4 , 40W into 8
Sine wave r.m.s. power output: 55W into 4 , 28W into 8 (restricted by limiter operation)
Peak power output: 160W into 4 , 80W into 8
Gain: -infinity to 28dB (adjustable on rear panel)
Frequency Response: <10Hz to 35kHz (-3dB), less than 1dB down @ 20kHz
Signal to Noise ratio: 86dB (22Hz to 22kHz), 90dB (A-weighted)
THD: <0.03% (at 1kHz and 25W), <1% (20Hz-20kHz) all output levels
Input level for 55W output: 610mV r.m.s. at maximum gain setting (limiter operation begins)
Input impedance: 10k
Maximum input level: 30V r.m.s.
Bridge Mode (per pair of channels):
Programme power output: 160W into 8
Sine wave r.m.s. power output: 110W into 8 (restricted by limiter operation)
Peak power output: 320W into 8
Gain: -infinity to 34dB (adjustable on rear panel)
Frequency Response: <10Hz to 35kHz (-3dB), less than 1dB down @ 20kHz
Signal to Noise ratio: 86dB (22Hz to 22kHz), 90dB (A-weighted)
THD: <0.03% (at 1kHz and 50W), <1% (20Hz-20kHz) all output levels
Input level for 110W output: 610mV r.m.s. at maximum gain setting (limiter operation begins)
Input impedance: 10k
Maximum input level: 30V r.m.s.
Ohm Ohm
Ohm Ohm
Ohm Ohm
Ohm
Ohm
Ohm
Ohm
Ohm
Mains input:
Voltage: 100-120Va.c. or 220-240Va.c. (switch on rear)
Frequency: 50 or 60Hz
Idle power consumption: 27W
Typical operating power: 100W (Music signal at high level - limiter operating)
Maximum input power: 350W (Full power sine wave on all channels)
Protection:
Over-current (low impedance loads), short-circuit, over-temperature, input overload, anti-clipping limiter.
Display:
LED bargraph showing input level, -18dB, -12dB, -6dB, -3dB, 0dB.
0dB indicates limiter activation.
Cooling:
Passively cooled by convection. Air enters at sides and exits through top of case.
Please allow at least 7cm of clearance above top of case and 4cm each side.
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