M-Audio BX4 4.5″ 120W Studio Monitors (Pair)


M-Audio BX4 Studio Monitors – 4.5 ” 120W – 4.5″ Kevlar Woofer – 1″ Silk-Dome Tweeter – 130W Peak Total, 25W RMS per Speaker – 69 Hz to 22 kHz Frequency Response – Computer-Engineered Waveguide – Volume, High- and Low-End Controls – Rear Bass Port – RCA and TRS Inputs – Includes Acoustic Foam Feet – Incudes Pro Tools | First


M-Audio BX4 4.5″ 120W Studio Monitors (Pair)


M-Audio BX4 Studio Monitors – 4.5 ” 120W is a 2-way, studio monitor designed to offer a wide frequency response and easy configuration for producers, podcast creators, mixing engineers, and others who require a critical ear. The M-Audio BX4 Studio Monitors – 4.5 ” 120W produces a frequency response of 69 Hz to 22 kHz, thanks to two amplifiers feeding a 4.5” Kevlar woofer and 1” silk-dome tweeter.

A rear-mounted bass port delivers the extended bass response, while the tweeter’s computer-engineered waveguide yields a wide sweet spot and minimized high-frequency scatter. Volume and high- and low-frequency controls are provided, so you can tune the monitor to cooperate with the sound of the room.

The monitors have both RCA and balanced 1/4″ jacks, so you have your choice of what kind of device you input into the speakers.

One monitor houses the power and controls, distributing power to the other by means of an included 3.5mm TS interconnect cable. Choose which monitor is on the left and which is on the right, ensuring everything is playing back correctly by means of L/R switches on the rear.

If you want to monitor privately, you can do so via the front-mounted 3.5mm headphones output with volume control. Also, plug in your favorite compatible media player by means of the 3.5mm auxiliary input. The monitorship with a copy of Pro Tools | First, so you can get started manipulating audio in the digital world right away.

Thoughtful Construction

The two-way design features an acoustically inert MDF cabinet with a bass reflex that provides smooth low end and punch through the black Kevlar low-frequency drivers. Plus, enhanced rear ports add extended low-frequency response, which makes any video game, movie, or song you play sound full and rich.
The computer-optimized natural silk-dome tweeters ensure you hear all the high-end frequencies and provide precise stereo imaging.


The rear-panel connections offer 1/4″ and RCA inputs making them compatible with all your gear.
There is an 3.5mm aux input and headphones connections cleverly placed on the front of the speaker for your tablet, computer, or mobile device. These connections allow you to work privately and are ideal for reproducing any type of media.

Sound-Shaping Tools

High and low EQ controls help you dial in the perfect sound for your environment and let you customize the sound of the M-Audio BX4 Studio Monitors – 4.5 ” 120W. The left/right active speaker position switch lets you choose which speaker is on the left or right side.
This is very useful if you are left-handed and want the speaker with the front panel volume control on your left side.

Pro Tools | First Included

Pro Tools is the industry standard for recording software. This audio and MIDI recording software helps inspire any musician, podcaster, live streamer, or singer-songwriter to create, record, and share all their ideas across the world at any time.

Studio Monitor

Monitor Type

Active 2-Way



Power Rating

25 W RMS per Channel


Low-Mid Driver: 1 x 4.5" / 11.4 cm Kevlar Woofer
HF Driver: 1 x 1" / 2.5 cm Silk Tweeter


Frequency Response

69 Hz to 22 kHz

Signal Processing


1 x HF Shelf: 6 to -6 dB
1 x LF Shelf: 6 to -6 dB


Audio I/O

2 x RCA Unbalanced Female Analog Input
2 x 1/4" TRS Balanced Female Analog Input
1 x 1/8" / 3.5 mm TRS Unbalanced Female Analog Input
1 x 1/8" / 3.5 mm TRS Unbalanced Female Analog Input
1 x 1/8" / 3.5 mm TS Balanced Female Analog Output
1 x 1/8" / 3.5 mm TS Balanced Female Analog Input


AC Input Power

100 to 240 VAC, 50/60 Hz

Power Consumption

85 W


Dimensions (W x H x D)

6.1 x 8.9 x 6.9" / 15.6 x 22.5 x 17.5 cm (Each)


9.8 lb / 4.4 kg (Each)

Packaging Info

Package Weight

12.75 lb

Box Dimensions (LxWxH)

17.25 x 13 x 10.25"

  • M-Audio BX4 4.5" 120W Studio Monitors (Pair)
  • 2-Prong IEC Power Cable
  • TS 3.5mm Interconnect Cable
  • 3.5mm Auxiliary Cable
  • 3.5mm to RCA Cable
  • Set of Foam Feet
  • Pro Tools | First Software