Alfatron 250W-UB

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Alfatron 250W-UB

The ALF-250W-UB Compact Mixer amplifier has a built-in Media player with Bluetooth, onboard FM tuner and MP3 player. Front panel microphone input with priority function, rear panel balanced microphone input with phantom power. Emergency input function. Dual RCA line inputs and RCA aux out. 250W at 70/100V and 4-16 Ohms, 24V backup power input ,This is a Class-D Amplifier.

Product  Features

  • Speaker Output of 100V or 70V & 4 -16 Ohms rated power output of 250W
  • USB, FM Radio & Bluetooth with remote control
  • 2 MIC inputs, 1 EMC input, 2 Line inputs, 1 Line output
  • Individual Volume control for Mic 1-2, Aux 1-2,  bass/treble, and master volume control
  • Supports both AC100-240V & 24V power Supply
  • Priority: EMC > MIC1>Others
  • LED indicators for power, clip, protect and signal
  • With Short-Circuit, clip, overload and high temp protection.
  • Ideal for small venues such as Classrooms, retail stores, Coffee shops, restaurants, etc
  • Class-D



 Rated Power


Speaker Outputs

100V or 70V & 4 Ohms – 8 Ohms-16 Ohms


Mic 1 input by Unbalanced Jack

Mic 2 Balance XLR Socket

Line 1-2 inputs by RCA: Line output by RCA


Microphone 1-2, Line 1-2 and Mp3/FM, bass/treble and master

MIC1 – 2 input Sensitivity


AUX1 & 2 input Sensitivity


EMC input Sensitivity MIC


MIC Frequency response

180Hz – 10kHz (+- 3dB)

AUX Frequency response

70Hz -16Hz (+- 3dB)


< 5mV (4 Ohm load output terminal)


< 1% 1KHz


Short Circuit, Clip Overload and high Temp protection

Treble adjustment

10dB (+-2)

Bass adjustment

10dB (+ -2)

Rated Power Supply


Rated output voltage

250W/4 Ohm, AC220V




247 x 198 x 66mm

Packaging Size

343 x 302 x 121mm

Net Weight




1. Q – How many inputs does the 250W-UB support?
A – 5. 2 x microphone, 2 x RCA and EMC. Also, there is Bluetooth, a USB input for music files as well as FM capability.

2. Q – Can I use this amplifier with a 100v system?
A -Yes, the amplifier supports both 70v / 100v and 4 – 16 ohm.

3. Q – What is the output of the amplifier?
A – 250 Watts

4. Q – How do I control the amplifier?
A –  It is controllable via IR remote control and the front panel volume knobs.

5. Q – Does the amplifier support phantom power for condenser microphones?
A – Yes, there is a selectable switch by the MIC2 input.