APART MA-35 User manual

MA35-65
Instruction manual

Instruction manualMA35 & MA65
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MA35 & MA65

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MIXING AMPLIFIERS
Safety First !
• Caution: This professional device needs to be installed by
qualified personnel only.
• Caution: speaker and power wires must be compliant with your
local low Voltage directive.
• Please check the carton box for any kind of damage on
reception of the goods. In case of a damaged carton, please
contact your dealer before opening the carton.
• !!!! Danger !!!! Exposure to high sound levels may cause a
permanent hearing loss. Individuals vary considerably to sound
pressure level induced hearing loss but nearly everyone will
lose some hearing if exposed to high sound pressure levels for
a sufficient amount of time. Therefore it is recommended that
all persons exposed to equipment capable of producing high
sound pressure levels, such as this amplifier, be protected by
hearing protection while installing or operating this unit.
• Read all documentation before operating your equipment.
• Keep all documentation for future reference.
• Save the carton and packing material even if the equipment has
arrived in good condition.
• Should you ever need to ship the unit, use only the original
factory packing.
• Do not spill water or other liquids into or on the unit.
• Make sure power outlets conform to the power requirements
listed on the back of the unit.
• Do not use the unit if the electrical power cord is frayed or
broken.

Instruction manualMA35 & MA65
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• Always operate the unit with the AC ground wire connected to
the electrical system ground.
• Set level controls on amplifiers all the way down during power-
up to prevent speaker damage if there are high signal levels at
the inputs.
• Do not connect the inputs / outputs of amplifiers or consoles
to any other Voltage source, such as a battery, mains source, or
power supply, regardless of whether the amplifier or console is
turned on or off.
• Power down & disconnect units from mains Voltage before
making connections.
• Do not use the unit near stoves, heat registers, radiators, or
other heat producing devices.
• Do not operate equipment on a surface or in an environment
which may distort the normal flow of air around the unit. If the
unit is used in an extremely dusty or smoky environment, the
unit should be periodically “blown free” of dust.
• Do not remove the cover. Removing the cover will expose you
to potentially dangerous Voltages.
• Do not drive the inputs with a signal level higher than that
required to drive equipment to full output.
• Do not run the output of any amplifier back into another input.
• In case of mal-function this device should be serviced by
qualified service personnel only.

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MIXING AMPLIFIERS
Wiring and Installation
Features
MA35/65 is a very compact, extremely versatile 100 Volt mixing
amplifier, with three balanced microphone inputs with integrated
speech filters, paging priority switch, vox circuitry, built-in ding dong
chime and two line inputs on rca connectors. Stereo line inputs
are internally mixed to mono. Alternatively, you can connect your
mono sources to the left or right rca line in. MA35/65 have mains
power and emergency power connectors. MA35 can be emergency
powered from 12VDC power sources such as car batteries. MA65
can be emergency powered from industry standard 24VDC supplies.
Please note that the output level may vary up to 3 dB when the
emergency supply is in use.
For easy plug and play applications, use our MICPAT-D on mic input
1. It is possible to connect 2 pieces of MICPAT-D on mic 1 input.
Please note that MA35/65 is capable of generating hazardous
Voltages at the speaker outputs. All wiring should be done by a
qualified technician according to your local regulations. Always
turn off the power and disconnect the mains power cable during
maintenance or installation. For use in a 19 inch rack, you can use
the optional MA35/19 bracket, compatible with MA35 and MA65.
When installing the mixing amplifier, make sure the unit’s top,
bottom and sides are not covered by other units. Allow some free
airflow around the unit and keep all ventilation holes free from
obstructions and dust!

Instruction manualMA35 & MA65
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Operation
1. Power switch: flip the switch to turn the mains power on and
off. This switch has no influence on the emergency power
supply.
2. Power/status indicator: the led lights up green when mains
or emergency power is present. When the led blinks red, you
are reaching the power limits and the limiter will be activated.
Make sure the led never turns red. Reduce the levels if
necessary, or insert a dedicated compressor/limiter/leveler in the
signal path, especially when using paging microphones.
3. Bass tone control: center position corresponds to a flat
response. Turn left to decrease low frequency response, turn
right to boost low frequencies.
4. Treble tone control: center position corresponds to a flat
response. Turn left to decrease high frequency response, turn
right to boost high frequencies.
5. Mic/line levels: these rotary controls act as volume controls.
6 5 4 3 2 1

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MIXING AMPLIFIERS
Since this is a mixing amplifier, the inputs are all mixed together,
the output level of each input is determined by the position of
these controls. The controls of inputs not in use should be set
to the 0 position to avoid excessive noise.
6. Mic 1 input: balanced microphone input on 6.3 mm TRS jack.
This connector is internally hardwired to the rear microphone
1 XLR and DIN5 connector. Use only one of these connectors.
Microphone 1 can have priority over all other inputs (including
the microphone 2 and 3 inputs) by activating the vox circuit.
When the paging contact is used, only the line inputs (music)
will be muted. Caution: do not connect an unbalanced
microphone to the balanced TRS or XLR connector when
phantom power is activated. This will result in a short circuit on
the phantom power supply.

Instruction manualMA35 & MA65
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Connections
1 2 3 7
4
8
5
9
6
11 12 13 14 15 16 1710
1. Mains Voltage selector: to set the local Voltage. In case of
doubt, contact your dealer.
2. Mains socket/fuse holder: connect the IEC type power cord
here. The socket has an integrated 5 x 20 mm fuse holder.
Replace the fuse only with the same type and size. When the
fuse blows often, contact your nearest dealer.
3. Ground terminal: connect the ground of your audio cables here
if required. If hum occurs, use a ground loop isolator instead.
4. Emergency power supply connector: connect the emergency
DC supply here. 12 VDC for MA35, 24 VDC for MA65. Please
note that the output level may vary up to 3 dB when the
emergency supply is in use.
5. Speaker output: only one type of output can be used: 8 Ohms
or 70 Volt or 100 Volt. COM is the speaker ground or common
connection for all types of speakers. Maximum output power is

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MIXING AMPLIFIERS
35 Watts (MA35) or 65 Watts (MA65). In 100 Volt this results in
a minimum load impedance of 286 Ohms (MA35) or 154 Ohms
(MA65). The low impedance output (8 Ohms) requires a load of
8 to 16 Ohms. Never use more than one output simultaneously.
This will result in continuous overloads and will cause excessive
heat dissipation.
6. Chime and mute contact terminals: by shorting these terminals,
the chime will sound (first turn the chime level control to set
the loudness of the chime) and music will be muted. Never
apply any foreign Voltage to these terminals, in other words:
only connect potential free or “dry” contacts such as push
buttons or relay contacts.
7. Pre-amp out / amp in: if necessary, you can send the signal of
the preamplifier to an external device such as an equalizer or
compressor/limiter/leveller and feed the treated signal back into
the amplifier via the poweramp input. When you don’t use this
feature, the RCA bridge must be placed, or no sound will be
heard.
8. REC out: To record paging messages etc, connect this output to
any recording device with line level input, or connect to another
power/mixing amplifier.
9. Line input 4: stereo RCA input for line level signals from tuners,
CD players… The left and right signals are internally mixed to
a mono signal. You can also connect a mono source to the left
and/or right channel input.
10. Line input 3: stereo RCA input for line level signals from tuners,
CD players… The left and right signals are internally mixed to
a mono signal. You can also connect a mono source to the left
and/or right channel input. This input is internally hardwired to
microphone input 3. Use only one of these inputs at the time.

Instruction manualMA35 & MA65
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11. Microphone 3 input on XLR: balanced microphone level input
with optional phantom power supply. This input is internally
hardwired to the MIC 3 TRS jack input (12) and to line input 3
(10). Use only one of these inputs at the time. Do not connect
an unbalanced signal to the XLR connector when phantom
power is present, this will result in a short circuit of the
phantom power supply.
12. Microphone 3 input on 6.3 mm TRS jack: balanced microphone
level input with optional phantom power supply. This input
is internally hardwired to the MIC 3 XLR jack input (11) and
to line input 3 (10). Use only one of these inputs at the time.
Do not connect an unbalanced signal to the 6.3 mm TRS jack
connector when phantom power is present, this will result in a
short circuit of the phantom power supply.
13. Microphone 2 input on XLR: balanced microphone level input
with optional phantom power supply. This input is internally
hardwired to the MIC 2 TRS jack input (14). Use only one of
these inputs at the time. Do not connect an unbalanced signal
to the XLR connector when phantom power is present, this will
result in a short circuit of the phantom power supply.
14. Microphone 2 input on 6.3 mm TRS jack: balanced microphone
level input with optional phantom power supply. This input is
internally hardwired to the MIC 2 XLR jack input (13). Use only
one of these inputs at the time. Do not connect an unbalanced
signal to the 6.3 mm TRS jack connector when phantom power
is present, this will result in a short circuit of the phantom
power supply.
15. Microphone 1 input on XLR: balanced microphone level input
with optional phantom power supply. This input is internally
hardwired to the MIC 1 DIN5 jack input (16) and the MIC 1
connector on the front panel of the unit. Use only one of these

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MIXING AMPLIFIERS
inputs at the time. Do not connect an unbalanced signal to the
XLR connector when phantom power is present, this will result
in a short circuit of the phantom power supply.
16. Microphone 1 input on DIN5: balanced microphone level
input. This input is internally hardwired to the MIC 1 XLR jack
input (15) and the MIC 1 connector on the front panel of the
unit. Use only one of these inputs at the time. The DIN5 wiring
diagram is shown on the back of the unit and is compatible
with our MICPAT-D and MICPACB-D microphones. MICPAT-D
and MICPACB-D require no phantom power !
17. Chime level control: when the chime/mute contact of
microphone 1 is closed, the chime will sound. Set its level with
this control.

Instruction manualMA35 & MA65
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MA35/65 internal jumpers/controls
1. DC Power supply fuse: replace only with the same type and
size: for MA35: 6.3A quick acting, for MA65: 8A quick acting.
This fuse offers additional protection for the emergency power
supply and the internal power supply. Replace only with the
same type of fuse: 6.35 x 30 mm, F6.3AF/250V for MA35 or
F8AF/250V for MA65.
2. Phantom power on/off jumper: setting the jumper to the on
position applies phantom power to all mics on the XLR and TRS
jack connectors. Do not use TS connectors or other unbalanced
microphones or balanced to unbalanced cable adapters when
phantom power is on. Never hot plug a phantom powered
microphone, this may result in damage of the unit’s electronic
circuits. Before unplugging a phantom powered microphone:
power off the amplifier and all other devices in the audio chain
and wait a minute. Default position of the jumper = off.
3. Vox mute on/off jumper: The MA35/65 has been shipped with
1
2
3
4

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MIXING AMPLIFIERS
this jumper in the OFF position. When you set this jumper to
the ON position, voice activated muting (vox) will be available
on microphone input 1. This muting system overrides the
mute activated by the chime/mute contacts. This way a two
level priority system is available. The level at which voice
activated muting starts is to be set by the internal vox sensitivity
attenuator (4) .
4. Vox sensitivity level: this attenuator sets the audio level at which
vox muting starts for microphone 1. This is only possible when
the vox on/off jumper (3) is set to the ON position. You have to
adjust this level carefully; otherwise background noise picked
up by your microphone or microphone cable might activate the
vox mute, causing unwanted interruptions of the music signals.
NOTE: Internal jumpers/controls should only be operated by
qualified personnel. Warning: risk of electric shock! By opening the
cover of the unit, you will be exposed to hazardous Voltages.
Less Ohms is more Watts: working with 100 Volt loudspeakers
and amplifiers is very easy. Consider a 100 Volt speaker line as a
high Voltage power line: “transporting” amplified sound over a
long distance, using relatively thin cables, with multiple speakers
wired in parallel, using local speaker line volume controls... Every
100 Volt speaker in the chain has a 100 Volt transformer which
transforms the high Voltage back into a normal speaker level. The
transformer and speaker act as one and represent a certain load for
the 100 Volt amplifier. The load is expressed in Watts allowing easy
calculations in terms of 1 + 1 = 2. A simple calculation rule reveals
the equivalent power in Watts @ 100 Volt once the load impedance
is known: power @ 100 V = (100 V x 100 V) / impedance. The
sum off all speakers in Watts must be smaller than or equal to the
output power of the 100 Volt amplifier. If you exceed the number

Instruction manualMA35 & MA65
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of Watts connected to your 100 Volt amp, the amp will “see” a
load that he cannot handle properly. The amplifier will become very
warm, overheat, shut down and eventually fail.
Choose wisely: a 35 watt 100 Volt amplifier can handle a speaker
load of 35 Watts, equivalent to 286 Ohms. This is calculated as
follows: (100 Volt x 100 Volt) / 35 Watts = 285.7 or 286 Ohms. If
the total impedance of all speakers is lower than 286 Ohms, the
amplifier will be overloaded. For example: the measured impedance
of all speakers = 200 Ohms. The amplifier will see a load of (100
Volt x 100 Volt) / 200 = 50 Watts. This is too much for the 35 watt
amplifier. There will be sound, but the amplifier will become very
hot. A 65 watt 100 Volt amplifier such as the MA65 sounds like the
right choice in this case.
To measure the total load a chain of 100 Volt speakers represents,
you need a dedicated impedance meter such as the Apart IMPMET.
Measuring speaker impedance is not possible with a standard
multi-meter because an ohmmeter measures resistance, using a
DC Voltage or something similar. An impedance meter measures
impedance, using a carefully tuned AC Voltage with a certain
frequency. Before connecting a number of 100 Volt speakers to
your amplifier, measure the impedance, not the resistance, of all
speakers including all wiring, volume controls... and make sure
the total load the chain represents is within the limits the amplifier
can handle. If you have included local volume controls in the
100 Volt speaker line, double check if you haven’t swapped the
ins and outs of the volume controls, because that causes hard
to find short circuits in the speaker line. Always set the volume
controls to the maximum position if you want to measure a 100
Volt speaker line. And last but not least: disconnect the speaker
line from the amplifier before you attempt to measure the line.
Never ever use standard low impedance speakers on a 100 Volt
line. An 8 ohm speaker would represent a load of (100V x 100V) / 8
ohm = 1250 Watts.

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MIXING AMPLIFIERS
The Apart IMPMET is a dedicated speaker impedance meter.

Instruction manualMA35 & MA65
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Specifications
General
Mains Voltage 230/115 VAC
AC supply frequency 50-60 Hz
Emergency supply 12 VDC (24 VDC)
Mains fuse rating 230 VAC F1 AT / 250 V (F1.6 AT / 250 V)
Mains fuse rating 115 VAC F2 AT / 250 V (F3.15 AT / 250 V)
DC emergency supply fuse F6.3 AF / 250 V (F8 AF / 250 V)
Output power @ 100 Volts 35 Watts RMS (65 Watts RMS)
Frequency response amp in 20 Hz – 20 kHz +- 3 dB
S/N ratio amp in >90 dB
Bass tone control 100 Hz +- 10 dB
Treble tone control 10 kHz +- 10 dB
THD < 0.5 % @ full output -6 dB
Limiter Dynamic limiter with slow release,
threshold at -3 dB of max output
Led indicator Power on: green/limiter active or
overload: red
Chime 2 tone chime with adjustable level
(ding dong) activated by contact
closure
Priority levels 2 step priority mute:
I: VOX on mic 1 mutes mic 2-3 and
all line inputs
II: contact closure mutes music

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MIXING AMPLIFIERS
Muting circuit >40 dB
Operating temperature -10 to +45 °C
Relative humidity 10% - 90% non condensing
Dimensions H x W x D 88 (102 including feet) x 272
x 286 mm
Net weight 4.75 kg (5.9 kg)
Standard Accessories User manual, power cable
Optional accessories MA35/19 (19 inch mounting
brackets)
MICPAT-D, MICPACB-D (paging
microphone)
Inputs
MIC1 1 mV/600 ohms (balanced XLR,
TRS, DIN5), speech optimized filter
MIC2 1 mV/600 ohms (balanced XLR,
TRS), speech optimized filter
MIC3/LINE3 1 mV/600 ohms (balanced
XLR,TRS), 300 mV/47 kohm (RCA),
speech optimized filter
MIC 1-3 speech filter lo-cut @ 90 Hz
LINE4 300 mV / 15 kOhm
Amp in 1V (RCA)
S/N ratio mic >67 dB
S/N ratio line inputs >77 dB
Outputs
Pre Amp out 1V (RCA)
Record Out 350 mV (RCA)
Phantom power mic 1-2-3 approx 12-18 VDC

Instruction manualMA35 & MA65
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Power amp 70 V, 100 V, Lo-Z (8-16 Ohm)
Chime 2 tone (ding dong) activated by
contact closure, adjustable chime
level (off-max)

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MIXING AMPLIFIERS