DAPAudio MPA-4150, Product Manual

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4
Description of the device
Features
The MPA-4150 is a professional high power Public Adress Amplifier:
• 4 independent channels
• 4 sets of bas treble and volume controls
• 4 LED level meters with protection indicator
• 4 balanced inputs for Mic/ line and input sensitivity control
• Telephone paging function, Phoenix type terminal block input type
• Low impedance 4Ω, 8Ω and high impedance 25V/ 70V/ 100V output
• Output power: 150W(RMS) x 4
• Selectable input types: COMBO (TRS & XLR) and terminal type
• Switchable input functions:
MIC/Line input sensitivity
Phase
High-pass filter
48V phantom power
• Input mode selectable: Four independent inputs
• 19”Rack mount type (3HE size)
Frontpanel
Fig. 1
1. Aux 2.
Use to adjust the aux 2 input level.
2. Chime.
Use to adjust the chime level.
3. Siren.
Use to adjust the siren level.
4. Treble.
Use to adjust the treble frequencies for each channel to your preference.
5. Master.
Use to adjust the volume level for each channel to your preference.
6. Bass.
Use to adjust the Bass frequencies for each channel to your preference.
7. Clip LED.
The LED lights up when the distortion exceeds 0.5%. This means that the output-signal is too strong,
so you should reduce the input-signal
8. Prot LED.
Indicates that the amplifier is in protection mode. This is either caused by a short circuit in the output
load or a mismatch of impedance. Check that the impedance of your speakers matches the output.
In case of using the 25V, 70V or 100V outputs this means that your total speaker-power may
never exceed 150W. Using less power is no problem in 25V, 70V or 100V systems.
In case you’re using the low impedance outputs (4 or 8
Ω
) make sure your speaker impedance
matches the output impedance. The total speaker-power should be at least 150W.