Specifications
WWW.APART-AUDIO.COM
4
You can mix spoken microphone messages with music in different ways using the PM7400 MKII:
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.
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 !
How to mix music and microphone signals?
output zone 1 unbalanced : 0 db/600 ohm
output zone 2 balanced : 0 db/600 ohm
frequency response
20 – 25000 hz (line level inputs)
thd <0.01%
s/n ratio >90 db (line level inputs)
line level input 1 balanced: 500 mv/20 Kohm
line level inputs 2-6 unbalanced: 500 mv/20 Kohm
mic level inputs 1 and 2 balanced: 1 mv/600 ohm
phantom power mic 1/2 14 vdc switchable (Jp1 and Jp2)
tone control bass +/- 12 db @ 80hz
tone control mid +/- 12 db @ 1500 hz
tone control treble +/- 12 db @ 10000hz
power consumption max 10 va
mains voltage 230 vac/50 hz
dimensions 481 x 44 x 275 mm (19”/1he)
net weight 3.4 Kg
shipping weight 3.8 Kg
Technical specications
If you experience troubles with ‘hum’ or ‘buzz’, you can try to solve them by disconnecting the jumper JP3 inside the
device. This jumper acts as a ground lift switch and will disconnect the signal ground from safety ground. Contact
a qualied technician to do this. If even this action does not help, you have a serious ground loop problem. Please
switch off all devices rst and solve this problem. Find the cause by starting from scratch: disconnect all sources
and other external gear rst, then connect them one by one. This way you will easily nd the cause of the ground
loop. Often this will be a radio tuner or similar device connected to a cable distribution network. Ground loops can
cause serious damage to audio devices and is NOT covered by warranty. APart-audio has a very wide product
range including adequate and intelligent problem solvers, such as our BUZZSTOP MKIII multifunctional ground
loop-isolator/level-converter.
Please visit our website regularly and stay in touch with the latest product updates and events.