Radio Design Labs FP-MX4
4-Input Mic/Line Mixer


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Radio Design Labs' FP-MX4 is a single channel audio mixing module featuring four identical inputs. Each input accepts either a mic or line level source. The output section provides four mixing potentiometers corresponding to the four inputs, and a level indicator. The output section provides both a balanced line (+4 dBu) and balanced microphone level (-45 dBu) output. Both outputs may be used at the same time. The four mixing potentiometers are intended to be set at installation or to be adjusted occasionally.

NOTE: Radio Design Labs' PS-24AS power supply is NOT included but is required in order to power this product.  Please see the "Accessories" tab or click here for more information on the PS-24AS power supply.


  • Microphone Inputs(4): 2 kW balanced, switchable 24 V phantom (IEC 1938: 1996-12)
  • Microphone Input Level:
        * Switch selectable ranges: -30 to –40 dBu, -40 to –50 dBu,< -50 dBu
  • Line Inputs (4): 10 kW balanced (may be wired unbalanced)
  • Line Input Level: +4 dBu
  • Gain Adjustments (4):
        * Mic: Off to 65 dB gain (max. gain range)
        * Line: Off to 6 dB gain
  • Frequency Response:
        * Mic: 10 Hz to 30 kHz (± 0.25 dB)
        * Line: 10 Hz to 45 kHz (± 0.25 dB)
  • THD+N:
        * Mic:< 0.012%
        * Line:< 0.004%
  • Residual Noise (below +4dBu output): 4 line level sources (unity gain):< -84 dB (wideband)
        * 40dB Gain Mic: -90 dB; All 4 mic level sources:< -82 dB (wideband);< -84 dB (A)
        * 50dB Gain Mic: -86 dB; All 4 mic level sources:< -72 dB (wideband);< -76 dB (A)
        * 60dB Gain Mic: -80 dB; All 4 mic level sources:< -65 dB (wideband);< -67 dB (A)
  • Outputs (2):
        * Line: +4 dBu 150 W balanced
        * Mic: –45 dBu 150 W balanced
  • Indicators (2): Audio level meter
  • Power Requirement: Ground-Referenced 24 Vdc @ 160 mA
  • Dimensions (H x W x L): 1.42" x 3.25" x 8.14" (3.61 x 8.26 x 20.68 cm)
24 VDC 500mA Switching Power SupplyRadio Design Labs PS-24AS 24 VDC 500mA Switching Power Supply

Radio Design Labs' PS-24AS is a 24 Vdc switching power supply with a North American AC plug.  500 mA, dc plug.Specifications: Input: 100 to 240 VACOutput: 24 Vdc, 500 mA (UL, CSA)Dimensions: 1.65" x 2.75" x 1.45" (4.2 x 7 x 3.7 ...

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