M-Audio BX4 Multimedia Reference Studio Monitor User Manual

Content

M-Audio BX4 Multimedia Reference Studio Monitor Manual

The m-audio BX4 Multimedia Reference Studio Monitor is a compact, powered two-way speaker system designed for desktop music production, gaming, video editing, podcasting, media playback, and everyday computer audio. Its active left speaker contains the amplification, while the passive right speaker connects through the supplied speaker cable, creating a practical stereo monitoring setup without requiring a separate amplifier.

Each monitor combines a 4.5-inch low-frequency driver with a 1-inch silk-dome tweeter. Together, these drivers provide clear midrange detail, articulate high frequencies, and controlled bass for nearfield listening. The system delivers up to 120 watts of total peak power and 2 x 25 watts RMS, making it suitable for personal studios, bedrooms, workstations, and small editing environments.

Multiple input options support common audio sources, including balanced 1/4-inch TRS connections, stereo RCA, and a 1/8-inch auxiliary input. A front-panel headphone output allows private listening without disconnecting the speakers. The compact cabinet design is useful where desk space is limited, while the included foam feet help reduce vibration between the speakers and the work surface.

This guide explains the BX4 specifications, connection procedure, placement recommendations, safety precautions, troubleshooting steps, and practical operating advice. It is intended for beginners setting up their first studio monitors as well as experienced users adding compact reference speakers to a desktop system.

M-Audio BX4 Specifications and Features

Speaker type: Active two-way multimedia reference monitor system with one powered speaker and one passive speaker.
Frequency response: 69 Hz–22 kHz.
Output power: 120 watts total peak; 2 x 25 watts RMS.
Low-frequency driver: 4.5-inch, approximately 114.3 mm.
High-frequency driver: 1-inch, approximately 25.4 mm silk-dome tweeter.
Audio inputs: One stereo RCA input pair, two 1/4-inch TRS inputs, and one 1/8-inch stereo auxiliary input.
Headphone output: 1/8-inch stereo connection for private monitoring.
Speaker connection: 1/8-inch TRS interconnection cable between the active and passive monitors.
Power requirement: 100–240 VAC, 50/60 Hz, with 85-watt power consumption.
Dimensions: Approximately 6.1 inches wide x 6.9 inches deep x 8.9 inches high per speaker.
Typical applications: Desktop recording, music production, gaming, video editing, podcasting, and multimedia playback.

How to Set Up the M-Audio BX4 Studio Monitor

Step-by-Step Connection Instructions

Place the powered speaker on the left side of your desk and the passive speaker on the right. Position both tweeters close to ear height and angle the speakers toward your listening position.
Attach the supplied interconnection cable between the output on the powered speaker and the input on the passive speaker.
Connect your audio source. Use TRS cables for compatible audio interfaces, RCA cables for consumer stereo equipment, or the 1/8-inch auxiliary connection for a computer, tablet, or phone.
Set the source volume to a low level, connect the power cable, and switch on the BX4 system.
Slowly raise the source volume, then adjust the monitor level to a comfortable listening position. Avoid operating continuously at maximum volume.
For headphones, connect them to the front headphone output. Headphone monitoring is useful for late-night work and checking edits without room sound.

Do not connect or disconnect audio cables while the system is powered at a high volume. Keep ventilation openings clear, place the monitors on a stable surface, and protect the speakers from moisture, heat, and impact. If you hear hum, lower the source volume and test one input connection at a time to identify possible cable or grounding problems.

M-Audio BX4 Troubleshooting Guide

No Sound

Confirm that the power cable is firmly connected and the monitor is switched on.
Check that the interconnection cable is attached securely between the active and passive speakers.
Verify that the computer, audio interface, or media device is sending audio to the selected output.
Increase the source and monitor volume gradually, checking that the source is not muted.

Sound Comes from Only One Speaker

Inspect the speaker cable and reconnect both ends.
Check the left and right balance control on the source device.
Test another input or cable to determine whether the issue follows the source connection.

Hum, Buzz, or Distortion

Use a properly shielded audio cable and keep signal cables away from power adapters.
Reduce the source output level if the sound becomes harsh or distorted.
Disconnect unused inputs and test the BX4 with a different source.
Place the speakers on stable foam feet or another vibration-reducing surface.

The BX4 documentation does not identify user-serviceable error codes. Do not open the cabinet or attempt internal repairs. For unresolved problems, consult the official M-Audio support service and keep the product details, purchase documentation, and a description of the fault available for warranty assistance.

M-Audio BX4 Pros and Cons

Advantages

Compact desktop design: The small enclosure fits workstations where larger nearfield monitors would be impractical.
Built-in amplification: The powered design eliminates the need for a separate stereo amplifier.
Flexible connectivity: TRS, RCA, and auxiliary inputs accommodate audio interfaces, computers, mobile devices, and consumer equipment.
Useful headphone output: Front-panel headphone monitoring is convenient for private practice, editing, and late-night listening.
Clear two-way reproduction: The separate woofer and silk-dome tweeter provide more structured monitoring than basic computer speakers.
Wide power compatibility: The 100–240 VAC design supports common mains voltages when used with the appropriate power connection.

Limitations

Limited deep bass: The 69 Hz lower frequency specification may not fully reproduce sub-bass-heavy music, film effects, or electronic production without a subwoofer.
Nearfield listening focus: These monitors are best suited to a desktop or small room rather than large-room sound reinforcement.
Passive second speaker: The right speaker depends on the powered speaker and supplied interconnection cable.
Not a wireless model: Users seeking Bluetooth connectivity should consider a BX4 variant specifically equipped for wireless operation.

The m-audio BX4 Multimedia Reference Studio Monitor is best for creators who need compact, versatile, powered desktop monitors. Users requiring extended low-frequency monitoring, very high listening levels, or larger-room coverage may need a larger monitor system or a dedicated subwoofer.

PDF

Faqs

How do I set up the m-audio BX4 Multimedia Reference Studio Monitor for the first time?

Place the active speaker and passive speaker on stable surfaces at ear height, forming an equal-sided triangle with your listening position. With the volume turned down, connect your computer, audio interface, mixer, or media player to the active speaker using RCA, 1/4-inch TRS, or 1/8-inch stereo input. Connect both speakers with the included interconnection cable, then connect power. Turn on the source first, followed by the BX4, and gradually raise the volume.

Why is there no sound from my m-audio BX4 Multimedia Reference Studio Monitor?

First, confirm that the power indicator is on and the volume control is not at its minimum position. Check that the cable is connected to an output on your computer, interface, or playback device and to the correct BX4 input. Verify that the source has selected the intended audio output and is not muted. Test another cable or source, then inspect the interconnection cable between the active and passive speakers.

Can I connect a laptop, phone, or audio interface to the m-audio BX4 Multimedia Reference Studio Monitor?

Yes. A laptop or phone with a headphone output can connect through the BX4 1/8-inch stereo auxiliary input. An audio interface commonly connects through the 1/4-inch inputs, while equipment with line-level RCA outputs can use the RCA input pair. Choose only the cable and adapter required by your device, keep the source volume moderate, and adjust the BX4 volume gradually to avoid sudden loud playback.

How do I reduce hum, buzzing, or electrical noise from the m-audio BX4 Multimedia Reference Studio Monitor?

Disconnect the audio cable briefly to determine whether the noise comes from the BX4 or the connected equipment. Use properly shielded cables, connect the source and monitors to the same power outlet when practical, and keep audio cables away from power adapters and extension cords. Lower excessive computer or interface gain, then raise the monitor volume moderately. If noise remains, test another source and cable before changing settings.

How should I position the m-audio BX4 Multimedia Reference Studio Monitor for accurate sound?

Place the BX4 speakers symmetrically, with the tweeters aimed toward your ears and both speakers the same distance from your listening position. Keep them away from corners and avoid placing them directly against a wall when possible, because nearby surfaces can exaggerate bass. Use stable stands or isolation pads to reduce desk vibration. Maintain a clear path in front of each speaker and keep the left-right arrangement consistent.

What do the high-EQ and low-EQ controls do on the m-audio BX4 Multimedia Reference Studio Monitor?

The high-EQ control adjusts treble frequencies, affecting brightness and detail, while the low-EQ control adjusts bass frequencies, affecting fullness and impact. Begin with both controls at their neutral positions and make small changes while listening from your normal working position. If the monitor sounds boomy, reduce low EQ or move it farther from the wall. If it sounds harsh, reduce high EQ rather than immediately lowering overall volume.

How can I use headphones with the m-audio BX4 Multimedia Reference Studio Monitor?

Connect headphones to the front-panel 1/8-inch headphone output when you need private monitoring. Headphone use is useful for late-night editing, checking stereo details, or confirming whether noise comes from the source or speakers. Start with the BX4 volume low and increase it carefully. If the speakers do not mute when headphones are connected, remove and reconnect the plug fully, then test another compatible headphone plug.

How should I clean and maintain the m-audio BX4 Multimedia Reference Studio Monitor?

Turn off and unplug the BX4 before cleaning. Dust the cabinet and grille with a soft, dry cloth; avoid spraying cleaner directly onto the speaker, controls, or drivers. Keep liquids, food, and excessive humidity away from the monitors, and do not press the woofer or tweeter diaphragms. Inspect cables periodically for loose connectors or damage, allow ventilation around the cabinet, and reduce volume before switching connections.