RDL ST-MX2 Universal Audio Mixer Specification & DataSheet

RDL ST-MX2 Universal Audio Mixer

HIGHLIGHTS

• Two Input Audio Mixing
• Selectable Mic or Line Level Inputs
• Simultaneous Mic and Line Outputs
• Add Additional Inputs to an Existing Mixer
• Audio Output Dual-LED VU Metering
• Balanced or Unbalanced Inputs and Outputs
• Low Noise and Low Distortion Performance

The ST-MX2 is part of the group of versatile STICK-ON products from Radio Design Labs. STICK-ONs feature the advanced circuitry for which RDL products are known, combined with unequalled versatility in mounting possibilities. The durable adhesives provided with the ST-MX2 permit permanent or removable mounting. Numerous available mounting accessories, brackets, rack-mount and tabletop chassis are optionally available to facilitate any system. STICK-ONs are designed, built and rated for continuous duty in professional A/V systems.

FUNCTIONAL DESCRIPTION

• The ST-MX2 is a two channel audio mixer. Each input channel is identical. Pin jumpers adjacent to each audio input permit the installer to set that input for either mic or line level. The mic input accepts low impedance balanced microphones (150 Ω nominal) or high impedance unbalanced microphones (5-kΩ-nominal). The line inputs are 20 kΩ bridging and accept either unbalanced or balanced audio signals. A single-turn trimmer is provided for each input channel. The usual range of mic or line level signals may be adjusted to produce +4dBu at the line level output. The dual LED audio meter provides accurate dynamic level adjustment without an external meter. A separate mic level output is also provided.
• The dual LED output meter 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.
• Unbalanced audio inputs are converted in the module to balanced. Mic level inputs are preamplified to line level. Either input may be turned down if it is not used. The combination of input levels, individual input adjustments and output levels makes the ST-MX2 suited to a wide variety of mixing, summing, preamplification and audio format conversion applications.

TYPICAL APPLICATION

• The ST-MX2 is used in any application requiring mixing of two audio sources. A mic may be mixed with a line level music source. Two mics may be mixed to feed the mic or line level input of a power amplifier in a meeting room or choir loft. A mic or professional +4 dBu line level mono sum is possible from stereo CD players, cassette decks, computer sound cards, televisions, and a wide variety of other unbalanced sources. If a single input channel is used, the ST-MX2 may be used to convert mono line level signals from consumer to professional, or from professional to consumer format. It may also be used as a microphone preamplifier, or conversely to adapt unbalanced or balanced line level signals into the microphone input of other equipment.
• The audio clarity, low noise, low distortion and versatility make this module ideally suited to a wide variety of demanding audio applications. Use this module individually, or in conjunction with other RDL modules as part of a high quality, flexible audio/video system.

Installation/Operation

EACH INPUT OR OUTPUT MAY BE BALANCED OR UNBALANCED

TYPICAL PERFORMANCE

Inputs (2):

• Mic or line selectable
• Input range for +4 dBu output:
  • Mic: -45 dBu to -65 dBu; max input: -28 dBu
  • Line: -18 dBV to +10 dBu max input: +22 dBu
• Input impedance:
  • Mic: 200 Ω
  • Line: 20 kΩ bridging
• Input or output configuration: Balanced or unbalanced

Outputs (2):

• MIC and LINE
• Output impedance: 150 Ω (mic or line)

Frequency Response:

• Mic: 25 Hz to 50 kHz (± 1 dB)
• Line: 10 Hz to 30 kHz (± 0.25 dB)

THD+N:

• Mic: < 0.05% (25 Hz to 20 kHz)
• Line: < 0.005%
• IMD: < 0.004%

Output Level:

• Mic: -45 dBu
• Line: +4 dBu

Headroom:

• Mic Input: > 22 dB (relative to -50 dBu), > 32 dB (relative to -60 dBu)
• Line Input: > 18 dB (relative to +4 dBu)
• Output: > 20 dB (relative to +4 dBu)

Noise (below +4 dBu):

• Mic: < -70 dB (150 Ω source, 50 dB gain), < -80 dB (200 Ω source, 50 dB gain)
• Line: < -90 dB (reference +4 dBu, unity gain)

CMRR:

• Mic: > 65 dB (50 Hz to 120 Hz)
• Line: > 45 dB (50 Hz to 120 Hz)

Ambient Operating Environment:

• Temperature range: 0°C to 55°C

Power Requirement:

• GROUND REFERENCED, 24 Vdc @ 60 mA

Declaration of Conformity available from rdlnet.com. Sole EMC specifications provided on product package. Specifications are subject to change without notice.

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 ST-MX2 Universal Audio Mixer?

The RDL ST-MX2 is a universal audio mixer designed for audio mixing and signal routing applications, offering versatility and control for audio professionals.

Who manufactures the RDL ST-MX2 Mixer?

The RDL ST-MX2 Mixer is typically manufactured by Radio Design Labs (RDL), a reputable brand in the field of professional audio equipment.

What is the model number of this audio mixer?

The model number of this audio mixer is ST-MX2, which identifies it within the RDL product lineup.

What are the key features of the RDL ST-MX2 Mixer?

The RDL ST-MX2 Mixer offers various features, including multiple audio inputs, mixing capabilities, level controls, and compact design for audio signal management.

Is it suitable for live performances and events?

While it's primarily designed for signal routing and mixing, the ST-MX2 mixer can be used for live performances and events when integrated into a larger audio system.

How many audio input channels does it have?

The ST-MX2 mixer typically includes multiple audio input channels, allowing you to mix and route audio signals from various sources.

What is the power source for the audio mixer?

The RDL ST-MX2 mixer is usually powered through an external power supply or a compatible power source, ensuring consistent operation.

Is it suitable for broadcast and recording studios?

Yes, the ST-MX2 mixer is suitable for broadcast and recording studios, providing control over audio signals and routing in professional audio environments.

Does it come with rack-mounting options?

The ST-MX2 mixer may or may not come with rack-mounting options, depending on the version or model. Check the product specifications for details.

Can it be used for sound reinforcement in installations?

Yes, the RDL ST-MX2 mixer can be used for sound reinforcement in installations where audio signal routing and mixing are required, such as conference rooms and venues.

Is it suitable for audio distribution and routing purposes?

Yes, the ST-MX2 mixer is suitable for audio distribution and routing applications, allowing you to route audio signals to different destinations as needed.

What is the warranty coverage for this product?

Warranty coverage for the ST-MX2 mixer can vary, so it's important to check the warranty details provided with your purchase.

Can it be controlled remotely or integrated into automation systems?

The RDL ST-MX2 mixer may offer remote control options or compatibility with automation systems for enhanced functionality and convenience.

Where can I find user manuals and product support?

You can often find user manuals and product support on the official RDL website or by contacting RDL customer support for assistance with any questions or issues.

Is it suitable for use in educational institutions and classrooms?

Yes, the ST-MX2 mixer can be used in educational institutions and classrooms for audio signal routing and management in educational settings.

What are the dimensions and weight of the mixer?

The dimensions and weight of the RDL ST-MX2 mixer can vary slightly between versions. Refer to the product specifications for precise measurements.

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