The U4RR4 Wireless In-Ear Monitor System from Xvive Audio provides performers and presenters a hands-free, cost-effective, and expandable solution that supplies 24-bit/48 kbps digital sound quality to their favorite in-ear and headphone monitors. This configuration includes four receivers, all able to receive the digital signal from the single included transmitter; ready for plug-and-play use in a wide variety of settings including musical venues and and theatres, houses of worship, schools, corporate conference rooms, and more.

The portable, easy-to-use U4 system features road-worthy components housed in tough molded-plastic and cast-metal chassis built to handle the rigors of touring and designed to work with a huge variety of audio gear. The components are powered by internal non-replaceable batteries that offer 5 hours of operating time and are recharged via USB ports.

The transmitter works with basically any mixer or other device that has an available balanced XLR or unbalanced 1/4" output jack. Just plug the transmitter in, and it will broadcast the incoming audio to any of its six selectable 2.4 GHz channels. Simply set the bodypack receivers to the same channel and you're good to go. The system provides a 90' line-of-sight transmission range and a 5 ms latency, low enough for musical applications.

2.4 GHz Band Works Anywhere in the World    Includes Four SE215 Stereo Earphones    Transmitter Plugs into XLR or 1/4" Gear    Four Bodypack Receivers with 3.5mm Jacks    5 Hours on Built-In Rechargeable Battery    24-Bit/48 kb/s, 5 ms Latency

• Simple to use: plug in the tranmitter and set the transmitter and four receivers to the same channel—that's it
• The 2.4 GHz system works anywhere in the world—ready to go where the tour goes
• The U4 receiver can work with multiple transmitters, you can add more as you need them
• The system offers 6 wireless channels to choose from, allowing you to expand the system with additional transmitters (available separately) and send different monitor mixes, specifically tailored to the needs of your performers

• The U4 offers 24-bit / 48 kb/s digital audio with a 107 dB dynamic range and a 20 Hz to 20 kHz frequency range
• Transmission range is 90' line of sight and the latency is 5 ms
• A built-in rechargeable battery powers each component for 5 hours 
• Belt clip and volume control on receivers
• Works with a wide range of in-ear and headphone monitors

• LINE MODE: Use with mixers or other professional audio devices that send line-level signals.
• AUX MODE: Use when connecting consumer audio devices such as portable audio players or computers

Related Questions and Answers

Q: 1. I am having trouble decided between the Shure SE215 and SE315, is it worth the price jump?

A: Apologies in advance for this generic answer, not a model-specific one ...IEM audio quality vs. cost has sharply diminishing returns. Among well-made IEMs, your first $100 gives 80-95% of the available sound quality improvement. Your next $400 only dials in fussy bits. Granted, I love my Shure SE535s. But I've paid 15% of their cost for IEMs that sound 95% as good.Granted, individual tastes vary (e.g., bass fans vs. flat fans). But this diminishing returns rule is pretty universal. So, if you're fussy and well-funded, sure, go big. Otherwise, don't envy the next quality step up; it's almost always smaller than you think.

Q: 2. The Shure SE215 do not have wireless connectivity, is that correct?

A: No, the Shure SE215 Pro Sound-Isolating Earphones are wired, not wireless headphones. The Shure AONIC 215 Gen 2 Bluetooth True Wireless In-Ear Headphones - Black (B&H # SHSE21DYBTW2) are the wireless version of the SE215.

Q: 3. Can this be used to turn a dynamic mic into a wireless mic?

A: Yes this will turn a Dynamic mic into a wireless mic

Q: 4. Will this disturb the frequencies of for example a Sennheiser G3? I'm looking to use this in location audio recording for film.

A: No, the Xvive Audio U4 Wireless In-Ear Monitor System with One Receiver should not interfere with the frequency transmission of Sennheiser's EW100 G3/G4 wireless systems. The Xvive uses 2.4GHz frequencies, which are far from the UHF frequencies in the 470-608MHz range that the Sennheiser operates within.

Q: 5. Can I put the xvive u4 on the mixer or on a speaker without the risk of it burning (as happened to me with the sennheiser ew100 g3 transmitter???)

A: The Xvive Audio U4 Wireless In-Ear Monitor System can be used with a mixer or passive loudspeaker, but it should be connected using a cable to avoid putting undue strain on the XLR connector.

Q: 6. Can these be used with other IEMs other than the Shure Brand?

A: You can use the Shure SE215 Pro Sound-Isolating Earphones Kit with RMCE-TW2 True Wireless Adapter (Clear) with any IEM body pack receiver via the 3.5mm cable. However, the TW2 Bluetooth adapters won't be compatible with the P3RA receiver as different wireless technologies are used.

Q: 7. Hi,Does this earphone fit in small Asian ear?

A: it comes with multiple fittings. the small ones will likely fit you.

Q: 8. Does it include the 1/4" to XLR Adapter?

A: Yes, the Xvive Audio U4 Wireless In-Ear Monitor System with One Receiver includes a 1/4" to XLR adapter.

Q: 9. can i leave the usb power plugged in on the transmitter 100% of the time? it will function plugged into power? would love to keep it a the soundboard and not have to think about charging. only the receiver would need to be charged as needed. thanks!

A: Xvive recommends powering off the components of the Xvive Audio U4 Wireless In-Ear Monitor System with One Receiver while charging. The user guide states: "Please do not use U4 when charging, which may reduce battery life." Essentially, while the transmitter may be able to operate while charged, it may be detrimental to the long term battery life and performance of the unit to do so.

Q: 10. Can this compatible with other Xvive wireless systems such as the U3? For example, can I use U3 transmitter with U4 receiver on the same channel?

A: Yes, according to Xvive, it is possible toa use a U3 transmitter with a U4 receiver when both units are set on the same channel. Xvive has a video posted on their Facebook page that shows the setup in use: http://www.facebook.com/xviveaudiousa/videos/can-a-u3-transmitter-work-with-a-u4-receiver-heres-live-proof-that-you-can/2287201628250839/