RDL FP-MX4 4 Ch Audio Mixer - Mic or Line Input and Output

MSRP: $617.04
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The 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. 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. Levels may be adjusted at the mixer using the RDL dual-LED VU meter which displays the mixer output level.


  • Four Channel Audio Mixer
  • Balanced Microphone and Line Inputs
  • Balanced Microphone and Line Outputs
  • Switch-Selectable 24 V Mic Phantom
  • Three Switch-Selectable Mic Gain Ranges
  • Studio-Quality, Low-Noise Performance
  • Convenience of RDL® FLAT-PAKs™



Microphone Inputs(4):
2 kΩ balanced, switchable 24 V phantom (IEC 61938: 2013)

Microphone Input Level:
Switch selectable ranges: -30 to -40 dBu, -40 to -50 dBu, < -50 dBu

Line Inputs (4):
10 kΩ 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)

Mic: < 0.012%
Line: < 0.004%

Residual Noise (below +4dBu output):
Note (A) = A-Weighted
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" weighted)
50dB Gain: Mic: -86 dB; all 4 mic level sources: < -72 dB (wideband); < -76 dB ("A" weighted)
60dB Gain: Mic: -80 dB; all 4 mic level sources: < -65 dB (wideband); < -67 dB ("A" weighted)

Outputs (2):
Line: +4 dBu 150 Ω balanced; mic: -45 dBu 150 Ω balanced

Indicators (2)
Dual-LED VU meter (line-level output)

Ambient Operating Environment:
0° C to 50° C

Power Requirement:
24 Vdc @ 160 mA, Ground-referenced

Overall Dimensions:
Height: 1.42 in. 3.61 cm, Width: 3.25 in. 8.26 cm, Length: 8.14 in. 20.68 cm

Package Type:
Cardboard Box

Package Dimensions:
3.375 x 8.5625 x 1.5 in.

Shipping Weight:
1.235 lbs.

WEEE weight:
0.99 lbs.

Tariff code:


RDL Three-Year Limited Warranty Installation of these products by the Purchaser shall constitute Purchaser’s acknowledgement and acceptance of the terms and conditions for sale and of this warranty, and shall constitute the Purchaser’s determination of the suitability of this product for the Purchaser’s intended application. Radio Design Labs, Inc., also referred to as RDL®, warrants to the Purchaser that products manufactured by RDL are free from defects in material and workmanship. This warranty applies to the period of three years from the date of shipment, except for component parts or products purchased from other sources and supplied by RDL. Such component parts or products bear only the warranty of the manufacturer thereof in effect at the time of shipment to the Purchaser. RDL will, without charge, and after written notice has been received and acknowledged by RDL, repair an RDL product if proved to be defective according to the usage of the trade, when such equipment is received by RDL at the location it designates with shipment costs prepaid by the Purchaser. RDL shall not be liable for any expense whether for repairs, replacements, material, service, or otherwise, incurred by the Purchaser or modifications made by the Purchaser to the product. No equipment shall be deemed defective if it shall fail to operate in a normal or proper manner due to exposure to excessive moisture in the atmosphere, excessive temperature extremes, improper environmental cleanliness, or any other environment not consistent with the principles of good engineering practice. In no event shall RDL have any liability for consequential damage or expense directly or indirectly arising from the use of the products, or any inability to use it either separately or in combination with other equipment or materials, or from any other cause, whether used in accordance with instructions or not. This warranty is void if equipment is altered in any way by other than RDL. RDL products are NOT intended for use in life support appliances, devices, or systems. Use of RDL products in such applications is done solely at the liability of the reseller/installer and/or end user. RDL reserves the right to change design parameters and specifications at any time without notice. The performance measurements reflect the products at the time of printing. This warranty is in lieu of all others, either expressed or implied. No representative is authorized to assume for RDL any other liability in connection with RDL products.