Alfatron MA15075D

The ALF-MA15075D is a compact digital mixing amplifier designed for low or high impedance applications. A mode selector switch allows it to deliver two channels of 75 watts each into 4 or 8 Ω, or a single channel of 150 watts at 70 or 100 V and 2 Ch of Dante.

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Description

The ALF-MA15075D is a compact digital mixing amplifier designed for low or high impedance applications. The mode selector switch allows it to deliver either two channels of 75 watts per channel into 4 or 8 Ω, or a single channel of 150 watts at 70 or 100 V. The use of a Class-D amplifier provides power efficiency and energy-saving. In addition to the amplified speaker output, a line level audio output allows the mixed audio signals to be sent to an additional amplifier or other audio system.

Feature:

·         Inputs: 1 x Dante audio, 1 x optical audio, Stereo balanced analog input, 2 x balanced microphone inputs

·         Outputs: 1 x balanced line level outputs, Stereo Low Impedance amp out, 1 x 70V/100V amplifier output

·         Selectable low or high-impedance operation.

·         2 x 75 watts @ 4 or 8 Ω.

·         1 x 150 watts @ 70 or 100 V.

·         Class-D amplifier design.

·         Automatic standby after a period of inactivity to minimize power consumption.

·         Rear panel input level controls for setting Microphones input gain.

·         Low inrush current to prevent audible “thumps” when multiple amps are powered on simultaneously.

·         Balanced analog audio output for pass-through to an additional amplifier or audio system.

·         Basic integrated DSP functions including five-band Graphic equalizer.

·         GUI Webserver with TCP/IP control for remote control or third-party integration.

·         Trigger port for external mute/ unmute trigger.

·         Front panel signal status LEDs for power, panel button lock, audio source, mute, and real-time volume level.

·         1U Size

Specification

Input Signal
Mic Input 2.2 kΩ
Mic gain adjustment range 0dB to +36dB
Analog Input Balanced: 20 kΩ, unbalanced: 10 kΩ
CMRR 51 dB / 58 dB
Output Signal
Distributed speakers (mono) 70 V / 100 V
Program speakers (stereo) 4 Ω / 8 Ω, line-level
Power

70 Vrms = 150 W (bridge mode)

100 Vrms = 150 W (bridge mode)

4 / 8 Ω = 75 W per channel

 
   
Audio Processing 
Sampling Rate  48 kHz / 24-bit 
Signal Processing 

Volume, Auto on / off signal sensing. 

Adjustable HPF, default setting of 100 Hz 

Equalization 

5-band, adjustable: 40 Hz, 150 Hz, 

500 Hz, 2 kHz, and 10 kHz bands 

Range: -10 dB to +10 dB 

Audio Performance 
Frequency Response  20 Hz – 20 kHz, ±2 dB @ 4 Ω load 
THD + N  < 0.1% @ 1kHz, 3 dB below clipping 
SNR  > 90 dBA WTD 
Damping Factor  < 90 @ 8 Ω 
Amplifier Type  Class D 
Temperature  Fahrenheit  Celsius 
Operating Temperature  32 °F to 122 °F  0 °C to 50 °C 
Storage Temperature  -40 °F to 158 °F  -40 °C to 70 °C 
Relative Humidity (RH)  20% to 90% RH, non-condensing 
Dimensions 

Physical Dimensions  

(Width x Depth x Height) 

  320mm x 245mm x 45mm 

 

Power 
Standby Mode 

Standby after 5-30 minutes 

(adjustable) of no signal. 

Consumption  150 W (max.) 
Supply  100 – 240 V AC, 50/60 Hz, 150 W 
   

 

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