u4 set
U4T9 trans
U4R2 image
U4R4 image
u4 transmitter
u4 receiver
U4 In-Ear Monitor Wireless System

U4 Complete System

  • High-quality, ultra-compact wireless system for in-ear monitors
  • Audiophile 24-bit / 48 kHz sound with less than 5 ms of latency
  • Industry standard 2.4 GHz wireless technology
  • Reliable, solid RF connection over a range of 90 feet
  • Can also wirelessly broadcast to an audio recorder or mixer

Model Number: U4

U4 In-Ear Monitor Wireless System

U4T9 Complete System + T9 In-Ears

  • U4 In-Ear Monitor Wireless System, plus T9 In-Ear Monitors
  • Complete IEM system for live performance and in-studio monitoring
  • Also includes a CU4 Carry Case

Model Number: U4T9

U4 In-Ear Monitor Wireless System

U4R2 Two-pack U4 System

  • Wireless in-ear monitoring solution for two people (includes two receivers)
  • High-quality, ultra-compact wireless system for in-ear monitors
  • Audiophile 24-bit / 48 kHz sound with less than 5 ms of latency
  • Industry standard 2.4 GHz wireless technology
  • Reliable, solid RF connection over a range of 90 feet

Model Number: U4R2

U4 In-Ear Monitor Wireless System

U4R4 Four-pack U4 System

  • Wireless in-ear monitoring solution for four people—a whole band! (includes 4 receivers)
  • High-quality, ultra-compact wireless system for in-ear monitors
  • Audiophile 24-bit / 48 kHz sound with less than 5 ms of latency
  • Industry standard 2.4 GHz wireless technology
  • Reliable, solid RF connection over a range of 90 feet

Model Number: U4R4

U4 In-Ear Monitor Wireless System

U4T Transmitter

  • Backup transmitter for U4 system
  • High-quality, ultra-compact wireless system for in-ear monitors
  • Audiophile 24-bit / 48 kHz sound with less than 5 ms of latency
  • Industry standard 2.4 GHz wireless technology
  • Reliable, solid RF connection over a range of 90 feet

Model Number: U4T

U4 In-Ear Monitor Wireless System

U4R Receiver

  • Add U4R receivers to a U4 system to connect to more people
  • High-quality, ultra-compact wireless system for in-ear monitors
  • Audiophile 24-bit / 48 kHz sound with less than 5 ms of latency
  • Industry standard 2.4 GHz wireless technology
  • Reliable, solid RF connection over a range of 90 feet

Model Number: U4R

Discover the freedom of wireless–live, at home or in the studio–and roam free with your favorite earbuds, headphones or in-ear monitors!
u4 transmitter

THE SYSTEM

The system is comprised of a transmitter unit, which connects to your audio source (typically a mixer or sound interface); and a belt-pack receiver, to which you connect your earphones or headphones.

u4 transmitter

LOUD AND CLEAR

The U4 system features high-resolution, 24-bit / 48 kHz audio, with a very wide and smooth frequency response between 20 Hz and 20 kHz, a signal-to-noise ratio of 107 decibels, and more volume than you’ll ever need. The sound is better than CD quality, and much, much better than MP3 quality!

LONG, EASY CHARGE

The internal battery in both the transmitter and the receiver lasts for 5 hours. The battery is easily charged using the included USB cable and any standard 5V USB charger, and charging takes between 1.5 and 2.5 hours depending on the current of the charger being used.

drummer with U4 receiver

APPLICATIONS

The basic application is to run a monitor mix from a soundboard, wirelessly, to one set of headphones or in-ear monitors—live, at home or in the studio. But there’s a lot more you can do with the U4 System!

DIRECT COMMUNICATION

If you have more than one U4 receiver, you can broadcast a signal to a whole group of people. This can be useful in situations where one person needs to communicate clearly and directly to a group—either in noisy environments or in situations where you don’t want to disturb others. This makes it an excellent option for things like group demos, presentations or tours.

FREE AND EASY RECORDING

For recording musicians, whether in a home or professional studio, going wireless makes the whole process so much freer and easier—especially if you’re playing or singing AND engineering at the same time!

DISCREET PRACTICE

If you want to practice guitar or bass privately—for example late at night—you can run your signal through a multi-effect unit or modeling amp, send either the ¼” or XLR output to your headphones or earphones, and move freely around your home!

BAND ON THE RUN

Your whole band—up to six musicians—can use the system together! There can be one monitor mix per transmitter, so if you have multiple U4 sets, you can customize monitor mixes for each band member. This is an easy, great-sounding and cost-effective monitoring solution for studio recording, rehearsals or live gigs. In rehearsal, this also means that there’s no need for PA speakers—so a band can practice in an apartment, or late at night.

chaoseum live

Specifications

WIRELESS TYPE

2.4 GHz ISM worldwide open band

BIT DEPTH/SAMPLE RATE

24-bit / 48 kHz

SWITCHABLE CHANNELS

6

SIMULTANEOUS CHANNELS

6

FREQUENCY RESPONSE

20 Hz – 20 kHz (-3dB)

DYNAMIC RANGE

107 dB (-3 dB)

SIGNAL-TO-NOISE RATIO

107 dB

STEREO/MONO

Mono

TOTAL HARMONIC DISTORTION

0.2%

LATENCY

5 ms

OPERATING RANGE

27.5 m / 90 ft (line-of-sight)
TRANSMITTER

INCLUDED

U4T

CONNECTOR

XLR or mono unbalanced 1/4” TS with supplied adapter

DIMENSIONS

100 x 30 x 28 mm / 3.8" x 1.2" x 1.1"

WEIGHT

90 g / 3.17 oz
RECEIVER

INCLUDED

U4R

HEADPHONE OUTPUT

3.5 mm / 1/8"

DIMENSIONS

60 x 47 x 41 mm / 2.36" x 1.85" x 1.61"

WEIGHT

118 g / 4.16 oz
BATTERY

TYPE

Rechargeable Lithium-ion (internal)

BATTERY LIFE

5 hours

CHARGING TIME

2.5 hrs (full charge)

CHARGING VOLTAGE

5V (USB)

USABLE WHILE CHARGING

Yes
U4 diagram with 5-piece band

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