RDL FP-MX4 4 Channel Audio Mixer Specification & DataSheet
- June 13, 2024
- RDL
Table of Contents
RDL FP-MX4 4 Channel Audio Mixer
FLAT-PAK™ SERIES Model FP-MX4 Mic / Line Mixer
- 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
The FP-MX4 is part of the group of versatile FLAT-PAK products from Radio Design Labs. The unique FLAT-PAK case can be directly screwed or bolted to cabinets or shelves. Optionally available rack-mounting accessories permit single or multiple FLAT-PAK module mounting. All FLAT-PAK modules are supplied with a power interconnect cable for daisy-chaining multiple modules from a single power supply.
- APPLICATION: The FP-MX4 is the ideal choice in many applications requiring mixing of microphone and line level sources at preset levels. Power connections are made using either the full-size barrier block terminals or a dc power jack located in one end panel. A second dc power jack is provided on the other end panel for connecting additional FLAT-PAK modules.
- The FP-MX4 is a single channel audio mixing module featuring four identical inputs. Each input section has a detachable terminal block, a source selection switch and a microphone gain switch. The output section provides four mixing potentiometers corresponding to the four inputs, a detachable terminal block for the audio outputs and a level indicator.
- Either microphone or line level audio is connected to each input terminal block. Each input may be wired balanced or unbalanced. The source switch selects from three inputs types: LINE (line level at +4 dBu), MIC (microphone level without phantom), MICPH (microphone level with 24 V phantom). For either microphone input setting, a separate MIC GAIN switch selects: LOW (35 dB – 45 dB), MED (45 dB – 55 dB), HIGH (55 dB – 65 dB). Separate source and gain switches are provided for each input channel, allowing any combination of 4 sources to be used simultaneously. The microphone inputs feature RDL’s exclusive low noise discrete preamplifier stage providing performance usually reserved for studio equipment.
- The four mixing potentiometers are intended to be set at installation or to be adjusted occasionally. The shafts may be adjusted either using a small screwdriver or manually without any tools. Any unused channel may be turned completely off. 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.
- Output level adjustment is simplified by the dual LED output meter which follows standard VU ballistics. A green LED illuminates at 15 dB below +4 dBu. The intensity of the green LED progresses from minimum at -11 dBu to full intensity at +4 dBu. The adjacent red LED illuminates at +4 dBu. The audio may be adjusted for maximum intensity of the green LED. Flashing of the red LED is equivalent to a VU meter needle swinging above the 0 level.
- The FP-MX4’s low profile and compact size permit mounting in confined spaces and in various locations in equipment racks. The location of the input/output jacks permits high-density mounting against flat surfaces while maintaining accessibility to the connectors. The wide variety of input signal levels and internal selectable phantom powering make the FP-MX4 ideal in diverse installations. The FP-MX4 may be mounted where needed, to rack sides or in an equipment rack (either the front or rear rack rails) using the RDL FP-RRA. Use the FP-MX4 individually, or combine it with other RDL products as part of a complete audio/video system.
Installation/Operation
TYPICAL PERFORMANCE
Microphone Inputs (4):
- Impedance: 2 kΩ balanced
- Phantom Power: Switchable 24 V phantom (IEC 61938: 2013)
Microphone Input Level:
- Switch selectable ranges:
- Mic Range 1: -30 to –40 dBu
- Mic Range 2: -40 to –50 dBu
- Mic Range 3: < -50 dBu
Line Inputs (4):
- Impedance: 10 kΩ balanced (may be wired unbalanced)
Line Input Level:
- +4 dBu
Gain Adjustments (4):
- Microphone: Off to 65 dB gain (max. gain range)
- Line: Off to 6 dB gain
Frequency Response:
- Microphone: 10 Hz to 30 kHz (+/- 0.25 dB)
- Line: 10 Hz to 45 kHz (+/- 0.25 dB)
THD+N (Total Harmonic Distortion + Noise):
- Microphone: < 0.012%
- Line: < 0.004%
Residual Noise (below +4dBu output):
- 4 line level sources (unity gain): < -84 dB (wideband)
- 40dB Gain (Microphone):
- Mic: -90 dB
- All 4 mic level sources: < -82 dB (wideband); < -84 dB (“A” weighted)
- 50dB Gain (Microphone):
- Mic: -86 dB
- All 4 mic level sources: < -72 dB (wideband); < -76 dB (“A” weighted)
- 60dB Gain (Microphone):
- Mic: -80 dB
- All 4 mic level sources: < -65 dB (wideband); < -67 dB (“A” weighted)
Outputs (2):
- Line Output: +4 dBu 150 kΩ balanced
- Microphone Output: –45 dBu 150 kΩ balanced
Indicators (2):
- Audio level meter
Power Requirement:
- 24 Vdc @ 160 mA, Ground-referenced
Overall Dimensions:
- Height: 1.42 in. (3.61 cm)
- Width: 3.25 in. (8.26 cm)
Radio Design Labs Technical Support Centers U.S.A. 800-933-1780, 928-778-3554; Fax: 928-778-3506 Europe [NH Amsterdam] (++31) 20-6238 983; Fax: (++31) 20-6225-287
FREQUENTLY ASKED QUESTIONS
What is the RDL FP-MX4 4 Channel Audio Mixer?
The RDL FP-MX4 4 Channel Audio Mixer is a compact and versatile audio mixing device designed for various audio recording and signal routing applications. It provides four audio input channels, level controls, and compatibility with line-level and mic-level signals.
What are the key features of the FP-MX4 Audio Mixer?
This audio mixer typically features four input channels with individual level controls, balanced and unbalanced input options, LED level indicators, and a compact form factor for easy integration into audio systems.
How many audio input channels does the FP-MX4 mixer have?
The FP-MX4 mixer has four audio input channels, allowing you to mix and route multiple audio sources simultaneously.
Is it suitable for live sound reinforcement?
While it's compact and designed for various audio applications, it is not typically used for live sound reinforcement in large venues due to its limited number of channels and features.
What types of audio sources can be connected to the mixer?
You can typically connect line-level audio sources, such as audio players, instruments, microphones, and other audio devices with compatible input connectors.
Is phantom power available for microphone inputs?
Some models of the FP-MX4 mixer may offer phantom power for condenser microphones, while others may not have this feature. It's important to check the specific model's specifications.
What are the output options for the FP-MX4 Audio Mixer?
The mixer typically provides line-level balanced and unbalanced output options, allowing you to connect it to amplifiers, recording devices, or other audio equipment.
Is there a headphone monitoring output?
The FP-MX4 mixer may not include a headphone monitoring output, as it is primarily designed for signal routing and mixing rather than personal monitoring.
Can the mixer be rack-mounted?
Yes, the FP-MX4 mixer is often designed for rack-mounted installations, making it suitable for professional audio setups and installations.
What is the power source for the mixer?
The power source for the FP-MX4 mixer may vary by model, but it typically includes options like AC power adapters or power supplied by the audio system it is integrated into.
Is the mixer compatible with Mac and PC?
Yes, the mixer is typically compatible with both Mac and PC systems, allowing for versatile integration into various audio setups and environments.
Can I use it for podcasting and audio recording?
Yes, the FP-MX4 mixer can be used for podcasting and audio recording when you need to mix and route audio signals from multiple sources to a recording device.
What is the warranty for the RDL FP-MX4 4 Channel Audio Mixer?
Warranty coverage may vary, so it's advisable to check the warranty details provided by RDL or the retailer at the time of purchase.
Does the mixer offer advanced audio processing features?
The FP-MX4 mixer is designed for basic audio routing and mixing and may not offer advanced audio processing features like built-in effects or equalization.
Where can I find additional resources and user manuals for the FP-MX4 4 Channel Audio Mixer?
You can find additional resources, user manuals, and customer support information on the official RDL website and through authorized RDL dealers.
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