The IEM-Digital 4 Wireless Stereo In-Ear Monitoring System by Vocopro offers dual mono or true stereo monitoring for vocalists and musicians in clubs, concerts, and assistive listening applications. The in-ear monitoring system is comprised of a dual-antenna transmitter with a rackmount kit and AC adapter, and 4 bodypack receivers—each with two AA rechargeable batteries, in-ear headphones with a set of eartips, and a USB cable with a wall adapter. 

It utilizes 24-bit digital dual-frequency technology for proper separation between the left and right channels while operating with 18 selectable channels in the 902 to 928 MHz frequency range to avoid interference. One-touch sync enables simple setup, and the selectable high- or low-transmission modes accommodate a variety of venue sizes. 

The transmitter's two XLR-1/4" combo inputs accept balanced or unbalanced line-level signals. Its outputs include a front-panel 1/4" TRS jack for stereo headphones and a rear-panel 3.5mm loop output for connecting to another transmitter. The bodypack receivers feature a 3.5mm TRS mini headphone jack and a micro-USB charging port. The transmitter and receivers are constructed of metal for rugged durability gig after gig.

24-Bit Digital Dual-Frequency Technology    18 Selectable Channels, One-Touch Sync    1 x Transmitter & 4 x Receivers    Use up to 9 Sets Simultaneously    2 x XLR-1/4" Combo Inputs on Transmitter    1 x 1/4" Headphone Jack on Transmitter    1 x 3.5mm Headphone Jack on Receiver    Includes In-Ear Headphones & Eartips    Includes Rackmount Kit & AC Adapter    Includes USB Cable & Wall Adapter

Rugged metal construction for lasting durability

24-bit digital dual-frequency transmitter and receivers

Up to 9 sets are designed to work together simultaneously

18 selectable frequency channels to avoid wireless RF conflict

Supports operation in true stereo or dual mono

Two independent channel outputs give each performer a dedicated connection

Operates in the 902 to 928 MHz frequency range free of interference

High- or low-transmission preference

Instantaneous connection and setup with one-touch IR sync

Digital transmitter display shows frequency, channel, audio level, and more

Receiver status LEDs

Adjustable gain and headphone level on transmitter

Volume/power knob and built-in belt clip on receivers

Related Questions and Answers

Q: 1. One transmitter to 50 receivers simultaneously according to the specs.With multiple speakers (maybe 8-16) spread out across a fair distance will result in latency issues. Is there a way to tweak individual latency/delay to each speaker/receiver?

A: The Wi Digital X8 does not offer delay compensation. If the application demands it, a delay unit should be connected to the receiver(s) before being inputted to the speaker.

Q: 2. Will this record a pre-digitized signal from a USB audio device? I have a mic/preamp/ADC that provides standard USB connection. Currently, I'm storing the resulting audio stream on my laptop, but the fan-noise of the laptop is audible in the recordings, and I'd like to find a fanless device to replace the laptop in this function.

A: It will not. It canan record any audio signal from a device with RCA outputs or balanced XLR outputs

Q: 3. My dad likes the volume so high that you almost have to shout above the TV to hear yourself. Can you turn these up that high?

A: The Sennheiser RS 175 Digital Wireless Headphone System (BH # SERS175) features an independent volume control that delivers vey high audio volumes. Your individual circumstances may require that your dad wears the headphones.

Q: 4. Can it be plugged directly into an audio mixer to record music?

A: The VocoPro SDR-4 Digital SD Card Recorder Module is compatible only with the VocoPro PA-PRO 900, STAGE-MAN, and MOBILEMAN.

Q: 5. Can the wireless antenna for the receiver be mounted outside of a building, and then run coax cable from antenna to receiver base station that will be inside the building?

A: No. But you can do what you are describing from your audio source or mixer, to the transmitter using XLR signal cable to the transmitter.

Q: 6. Yamaha RX-a730 has a 3-port RCA type av out (video/left/right). Is this where i would connect the base unit?

A: Yes, it should work. You would have to assign what audio goes out of the RCA connection if you have multiple sources you'd like to listen to.

Q: 7. I need a single transmitter that can xmit two individual channels to L & R stereo spkrs. I do NOT want a mono signal going to each spkr. These are Dolby ATMOS HT effects sprks and require discrete signals. So, believe it requires dual wireless xmit freqs? Not exactly sure what the technical solution looks like, will the Wi Digital WI-AMP50X8 fulfill this rqmt?

A: The Wi Digital system: https://www.bhphotovideo.com/c/product/1361205-REG/wi_digital_wi_amp50x8_wi_pro_audiomatrix_x8.html/specs is stereo to each speaker. This system will send separate left and right signals to individual receivers, one to each speaker. https://www.bhphotovideo.com/c/product/1247921-REG/alto_stealth_wireless_system_kit.html

Q: 8. If used with a Tv, does any latency occur, or all the lips and the sound in sync?

A: The VocoPro SilentSymphony-SOLO Wireless Audio Broadcast & Headphone System (BH # VOSILSYMPHS) should operate with little discernable latency.

Q: 9. Hello there, i'm looking to replace a 15 year old cd recorder & this USB recorder looks interesting, but i'm a skeptical, because i never heard of this brand before. How's the build quality of this unit? Does the recording quality of this unit sound as good as CD? Thanks!

A: Vocopro caters to Karaoke and DJ customers. The SDR-4000 is a dual recorder and player with independent inputs and output connections for each deck as well as a mix output via RCA. The unit records in Mp3 format which is compressed and not CD quality.

Q: 10. How long is the warranty? My system TX static with the audio.

A: The Wi Digital Wi Pro AudioMatrix X8 comes with a limited 1-year warranty from the manufacturer.