RF Venue COMBINE4 – 4-Channel In-Ear Monitor Transmitter Combiner

Product Overview

The RF Venue COMBINE4 is an active 4-channel in-ear monitor transmitter combiner that consolidates up to four IEM transmitter antenna signals into a single transmit antenna. By combining multiple IEM transmitters through one antenna rather than running individual antennas per channel, the COMBINE4 reduces stage antenna clutter, decreases intermodulation distortion between adjacent IEM transmitters, and allows a single directional or circularly polarized antenna to be positioned for optimal line of sight to performers. The COMBINE4 is compatible with all major UHF IEM transmitter brands.

Product Description

The COMBINE4 is a 1RU full-width rack-mount unit that installs alongside IEM transmitters in a standard equipment rack. Four BNC input jacks accept the antenna feed from each transmitter; a single BNC output routes to the chosen transmit antenna. DC pass-through jacks power up to four connected IEM transmitters, simplifying rack power wiring by eliminating individual power supplies for transmitters. An IEC power inlet connects directly to AC line voltage — no external power brick required.

The IEM combining benefit is most significant in multi-channel systems where four or more IEM transmitters are operating simultaneously. Without combining, each transmitter drives its own antenna, creating a dense RF environment on stage with elevated intermodulation products that can affect wireless microphone receiver performance. With the COMBINE4, all four IEM channels route to a single, well-positioned antenna. RF Venue recommends pairing the COMBINE4 with a circularly polarized transmit antenna — the CP Beam (CPB), CP Architectural, or CP Stage — for the best IEM receiver performance. For a complete ready-to-install pack including antenna and cable, see the COMB4CPB, COMB4CP-ARC, or COMB4CP-STAGE bundles.

Included accessories: four BNC jumper cables, four DC jumper cables, and one AC power cord. The COMBINE4 is the building block for all of RF Venue's IEM upgrade packs and is also available individually for integrators who already have antennas and cabling in place.

Key Features

• 4-Channel IEM Combining — Combines up to four IEM transmitter antenna feeds into a single output, replacing four individual transmit antennas.
• Reduced Intermodulation — Consolidating multiple transmitters through one antenna reduces intermodulation products that can interfere with wireless microphone receivers.
• 1RU Rack-Mount — Full-width 1RU rack-mount form factor; installs directly alongside IEM transmitters.
• DC Power Pass-Through — Powers up to four IEM transmitters via DC jacks, eliminating individual transmitter power supplies.
• Single Antenna Freedom — Allows one directional CP antenna to be optimally positioned outside the rack for maximum line-of-sight coverage.
• AC Line Power — IEC power inlet connects directly to AC; no external power brick required.
• Universal Brand Compatibility — Works with all UHF IEM transmitters in the 400–800 MHz range.
• Included Accessories — Four BNC jumpers, four DC jumpers, and AC power cord included.

Typical Applications

Suitable for:

• House of worship with multiple IEM channels on stage
• Auditorium and performing arts center IEM systems
• Broadcast studio and live event production with rack-mounted IEM transmitters
• Multi-purpose room permanent IEM installations
• Touring and rental production companies upgrading multi-channel IEM systems

Technical Specifications

Frequently Asked Questions

What is the difference between the COMBINE4 and the COMBINE6HDR?

The COMBINE4 supports four IEM transmitter channels; the COMBINE6HDR supports six and adds HDR (High Dynamic Range) technology for cleaner combining in high-density deployments. For systems with five or more IEM channels, the COMBINE6HDR is recommended.

What antenna should I use with the COMBINE4?

RF Venue recommends a circularly polarized transmit antenna. The CP Beam (CPB), CP Architectural (white or black), and CP Stage antennas are all compatible. For a complete pack with antenna and cable, see the COMB4CPB, COMB4CP-ARC, or COMB4CP-STAGE bundles.

Can I use the COMBINE4 with IEM transmitters from different manufacturers in the same rack?

Yes. The COMBINE4 accepts standard BNC antenna connections and is brand-agnostic. Mix transmitters from Shure, Sennheiser, Sony, Audio-Technica, or other manufacturers.

Does the COMBINE4 require a separate power supply?

No. The COMBINE4 includes an internal power supply and connects to AC line voltage via the included IEC power cord.

How many IEM channels can be combined through a single antenna?

RF Venue recommends no more than eight transmitters through a single combiner-antenna system. For eight channels, two COMBINE4 units with two antennas, or a single COMBINE6HDR with appropriate cabling, would be needed. More channels may result in signal loss through the combining network.

Where can I purchase the COMBINE4?

Available through Creation Networks at creationnetworks.net.