JK Audio RMx4
4-Channel Field Mixer


JK Audio's RMx4 combines a four-channel field mixer with a four-channel headphone amplifier, The RMx4 is perfect for small press, hotel conferences...
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List Price: $1,295.00
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JK Audio RMx4
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JK Audio's RMx4 combines a four-channel field mixer with a four-channel headphone amplifier, The RMx4 is perfect for small press, hotel conferences, DNG, sports, interviews, live remote and news, and can be used as a front-end mixer for your POTS, ISDN, IP or smart phone codec.

Great Sound

Four low noise, high headroom active balanced mic inputs feature extremely high common mode rejection for outstanding cable noise immunity, and a high-Pass filter removes room rumble and mic handling noise. A soft limiter prevents overdriving the full-duplex headset interface, while the master XLR and 3.5 mm outputs are pre-limiter (full range), along with a direct drive DC coupled XLR output for improved output cable noise immunity.


3.5 mm send and receive jacks for recording or playing back of recorded material. Separate headphone level and source selection controls for each headphone output. Monitor just the clean mixer output, or the Cue input plus the mix.

Power Smart Design

Phantom power is not always needed, yet it can really drain batteries. The phantom power generator only runs if any of the rear panel 48 V switches are set to “ON” position. Low noise, low power ICs are used throughout to preserve battery life. The 100-240 VAC desktop style power supply (included) overrides the battery power only - when the supply is actually providing power. If the power goes out, the batteries automatically cut in. Separate compartments for hot swapping batteries.

Its rugged design allows for field use, and runs for up to 10 hours on two hot-swappable 9-volt batteries. The unit has XLR out with a ¼” return to headphones and four ¼” headphone outputs, along with 3.5 mm TRRS which provides 2-way IFB audio from your cell phone or notebook.

JK Audio RMx4 Features:

  • Four low noise, high headroom XLR mic jacks
  • Mic/Line Switches on channels 3 & 4
  • Individually switchable 48v Phantom Power
  • 120 Hz Low Cut Filter
  • Master XLR output 20 Hz – 20 kHz
  • Four ¼” headphone jacks with individual sourceselector and level controls.
  • ¼” Headphone Cue Input
  • Phone headset interface with 3.5 mm TRRS plug
  • 3.5 mm Send and Receive jacks
  • LED VU Meter
  • Hot swappable dual 9 volt batteries
  • 100-240 VAC External AC power supply
  • Compliance tested for North America, CE markets, andAustralia.
  • Made in USA

JK Audio RMx4 Specifications:

  • Inputs:
    • Microphones (4): Female XLR - mic level = 2k ohm (-25 dBu nom.) Channel 3 & 4 have -40 dB Mic/Line pad switch Line level = 50k ohms, +20 dBu max.
    • Phantom Power: 48 VDC with 6.8k ohm supply resistance
    • Line Input: 3.5mm Stereo line input, 20k ohms -10 dBu nom.
    • Headphone Cue In: 1/4" mono, 20k ohms, -10 dBu nom.
  • Outputs:
    • Balanced Out: Male XLR 50 ohms +16 dBu max. 20 Hz - 20 kHz +/-1dB, 0.04% THD @ +16 dBu
    • Line Out: 3.5mm Stereo line output, 100 ohms -10 dBu nom.
    • Headphones (4): 1/4" Stereo 8 ohms, 1/3 watt per channel
  • Power: 120-240 VAC, 50-60 Hz external power supply ortwo 9 VDC batteries
  • Size: 9.5" x 8" x 3" (24 x 20 x 8 cm)
  • Weight: 3.6 pounds (1.6 kg)

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