Hall Research AMP-4840 40 Watt Audio Amplifier with Microphone Mixer

Hall Research
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Hall Research 40 Watt Audio Amplifier with Microphone Mixer and RS-232 Control


The AMP-4840 is a compact, economical and energy efficient (Class D) mono / stereo audio amplifier with 3 inputs (2 line in and 1 balanced mic). Versatile design is compatible with dynamic, condenser or wireless microphones with fully adjustable control options including RS-232, IR, and front panel buttons. Functions include bridge connection, dual-mono, EQ control, and microphone mixer.

It is designed to drive one or two speakers, but is capable of driving 4 speakers in parallel mode as shown below. In the below configuration each 8 ohm speaker will be able to deliver upto 10 watts of power for a total of 40 watts

Key Features

  • Drives: 2x 20w @ 4Ω or 2x 10w @ 8Ω or 1x 40w @ 8Ω in bridge mode
  • Two stereo audio inputs, switchable by button, IR remote & RS-232
  • Volume / Bass / Treble controllable by buttons IR remote & RS-232
  • MIC port supports balanced or unbalanced signals
  • 3.5mm jack line audio output with controllable volume
  • Mono mix switch for summing left and right channels for driving mono outputs
  • Microphone input can be mixed with line input and each can be controlled separately
  • MIC input supports 48V phantom power, dynamic MIC and wireless MIC
  • Auto noise squelch. Detects audio on inputs and mutes the output when there is no input
  • Does not have fans

   Image result for pdf icon      AMP-4840 Users Manual

Hall Research guarantees that the supplied equipment is free from defective workmanship and materials. Subject to the agreements set forth, Hall Research will repair or replace, at its option, the defective components for a period of 3 years from the date of purchase if purchased after January 1st, 2016. Equipment purchased before January 1st, 2016 have a 2 year warranty. Warranty is void if item is subject to improper use, negligence, or unauthorized modification. All products Hall Research sells have no user serviceable parts inside. Opening the unit without written permission from Hall Research will void the warranty.