APART PM7400 MKII Manuale utente

PM7400 MKII

Instruction manual

Instruction manualPM7400MKII

PM7400MKII Manual

Pre-ampliﬁer

Safety ﬁrst!

• Caution: hot and sharp surfaces! This professional device needs

to be installed by qualiﬁed personnel only.

• Please check the packing for any kind of damage upon

reception of the goods. If the packing is damaged, please

contact your dealer before opening it.

• !!!! Danger!!!! Exposure to high sound pressure levels may

cause permanent hearing loss. Hearing loss induced by

exposure to high sound pressure levels will vary from individual

to individual, but nearly everyone will lose some hearing

when exposed 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,

wear sufﬁcient ear protection while installing or operating this

unit.

• Read all documentation before operating your equipment.

• Keep all documentation for future reference.

• Keep the carton and packing material, even if the equipment

has arrived in good condition.

• Should you ever need to send the unit back, use only the

original factory packing.

• Do not spill water or other liquids on or into 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 damaged.

• Always operate the unit with the AC ground wire connected to

Instruction manualPM7400MKII

the electrical system ground.

• Turn the level controls on the 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 batteries, mains sources or

power supplies, regardless of whether the ampliﬁer or console

is turned ON or OFF.

• Power down and 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 regularly be “blown free” of dust.

• Do not remove the cover. Removing the cover will expose you

to potentially dangerous volt-ages.

• Do not drive the inputs with a signal level higher than that

which is required to drive equipment to full output.

• Do not run the output of any ampliﬁer back into another input.

• In case of malfunction, this device should be serviced by

qualiﬁed service personnel only.

Pre-ampliﬁer

Features

How to mix music and microphone signals?

• 2 zone stereo mixer, 1 balanced line output and 1 unbalanced

line output with individual volume controls

• 6 line inputs, 1 balanced (XLR), 5 unbalanced (RCA)

• 2 balanced microphone inputs with switchable phantom power

• Switchable vox mute on mic 1 with adjustable music mute level

• Microphone priority contact

• 3 band tone control for line and mic inputs

• Toroidal power transformer

• Mono/stereo switch

• 19 inch rack mountable with ﬁxed rack-ears

You can mix spoken microphone messages with music in different

ways.

1. Mix the microphone signals with the music by setting the mic

and line level volume controllers to an appropriate level. In order

to do this, the Vox/Ext. mute switch should not be pressed in and

the mute contact at the back should be open. You will notice

that you have to push the microphone level to a very high level.

This is not recommended.

Instruction manualPM7400MKII

2. Mix the microphone signal of mic 1 with the music using the

‘vox’ or ‘voice-over’ circuitry: The Vox/Ext. mute switch must

be pressed in, and the mute contact at the back must be open.

By setting the mic 1 and vox mute level at the back to an

appropriate level, you can create an automatic music muting by

talking into mic 1. This is not valid for the mic 2 input, i.e. mic 2

signals can not activate the vox circuitry.

3. By closing the external mute contact at the back, you will mute

the music signal. Now you can speak into mic 1 or mic 2. The

muting circuitry will only mute the music signals and allow

the mic signals to pass through. This way you can create a

microphone priority system easily. Please note that the external

mute contact at the back can only be connected to a switch.

Never apply any voltages to the external mute contacts!

Pre-ampliﬁer

Front panel

1. Microphone 1 input: balanced jack input. This is the same input

as the microphone 1 combo XLR/ jack at the back. This mic has

a switchable vox circuit with adjustable music mute level. This

way, a spoken message will suppress the music. Alternatively,

you can use the priority contacts at the back. Closing the

contacts will mute the music. Phantom power is available.

Therefore you need to close the phantom power dipswitch at

the back of the unit. Phantom power is switched off by default.

Mic 1 will be heard in both output zones.

2. Mute mode switch: by pressing this switch in, the vox mode

is active on mic 1 only. The vox mute level can be set via a

potmeter on the back of the unit.

3. Mic 1 volume control: this volume control adjusts the mic 1

level.

4. Mic 2 volume control: this volume control adjusts the mic 2

level.

5. Microphone 2 input: balanced jack input. This is the same input

as the microphone 2 combo XLR/jack at the back. You can

use the priority contacts at the back to mute the music while

speaking. Closing the contacts will mute the music. Phantom

power is available. Therefore you need to close the phantom

power dipswitch at the back of the unit. Phantom power is

3 5

4 6 8

9 10 12 14 15 16

11 13

Instruction manualPM7400MKII

switched off by default. Mic 2 will be heard in both output

zones.

6. Microphone bass tone control: for better speech intelligibility,

turn the microphone bass control down a little.

7. Microphone mid tone control: for better speech intelligibility,

turn the microphone mid control up a little if necessary. If you

experience feedback, turn the tone control down.

8. Microphone treble tone control: for better speech intelligibility,

turn the microphone treble control up a little if necessary. If you

experience feedback, turn the tone control down.

9. Power switch: ﬂip the switch to power on/off the unit. The blue

LED lights up when the power is on.

10. Line inputs (music) bass tone control.

11. Line inputs (music) mid tone control.

12. Line inputs (music) treble tone control.

13. Line inputs (music) volume control. Normally, set this control

fully open. If you want to adjust the music level relative to the

microphone level, use this control. Caution: when the line input

volume control is set to the 0 position, no music will be heard.

14. Line input selector: turn this knob to select line inputs 1 to 6.

15. Zone 1 volume control: adjust the volume of zone 1. The green

leds light up when a sufﬁciently strong signal is present.

16. Zone 2 volume control: adjust the volume of zone 2. The green

leds light up when a sufﬁciently strong signal is present.

Pre-ampliﬁer

Rear panel

2 3 4 6 8

1 5 7 9

13 14 10 12 15 16 17

1. GND connection: connect an additional ground wire here if

necessary.

2. Line 1 balanced right channel input on XLR.

3. Line 1 balanced left channel input on XLR.

4. Line 2 unbalanced L/R input on RCA connectors.

5. Line 3 unbalanced L/R input on RCA connectors.

6. Line 4 unbalanced L/R input on RCA connectors.

7. Line 5 unbalanced L/R input on RCA connectors.

8. Line 6 unbalanced L/R input on RCA connectors.

9. Zone 1 unbalanced line output on RCA connectors.

10. Mono/stereo, GND lift and phantom power dipswitches. For

mono operation in both zones, ﬂip dipswitch 1 to the on

position (down). Dipswitch 2 is normally to the on position: if

you want to separate the audio ground from safety ground, ﬂip

this switch up. Dipswitch 3 and 4 activate the phantom power

for mic 2 or mic 1 when switched on.

11. External mute contacts: close these contacts to mute the music

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