C-7

Stereo Wireless In-ear Monitor System

C-7

Practice. Rehearse. Perform. Stream.

The C-7 Stereo Wireless In-Ear Monitor System easily transforms your wired earphones into a wireless monitoring solution and is compatible with most in-ear monitor earphones. Operating on the 5.8GHz wireless frequency band, it delivers a more stable, low-interference wireless transmission experience. The newly added display screen provides a more intuitive view of channel selection, battery level, and system status. Featuring both Auto and Manual pairing modes, the C-7 also supports one transmitter connected to multiple receivers, making it ideal for synchronized band monitoring. Whether for daily rehearsals, live performances, streaming, or silent home practice, the C-7 delivers afreer and more convenient stereo wireless monitoring experience.

5.8GHz Frequency Band

30m Transmission

HD Display

6 Hours Battery Life

3000mAh Charging Case

Over 18 Hours Total Battery Life

Stereo / Mono

5 Preset EQs

Auto and Manual Pairing Modes

Support 1-to-Multiple Receivers

Professional Stereo Wireless Sound

Stable and smooth stereo wireless transmission delivers a clear and natural high-fidelity monitoring experience. With a wide and immersive stereo soundstage, you can break free from cables and fully immerse yourself in the music.

Auto & Manual Pairing Modes

Supports both Auto and Manual pairing modes. Auto mode enables quick 1-to-1 connection, while Manual mode supports one transmitter connected to multiple receivers with 10 channels.

One-Touch Frequency Hopping & Smart Channel Selection

In Auto mode, the system powers on and automatically connects while selecting the best available channel. When interference occurs, you can quickly switch frequencies with a single press. Manual mode also supports channel scanning to easily find a more stable wireless channel.

High-Resolution Mini Display

Equipped with a 0.87-inch high-resolution display for clear viewing of audio signal, battery level, pairing mode, EQ settings, and other system information.

Supports One Transmitter to Multiple Receivers

In Manual mode, one transmitter can connect to multiple receivers, making it ideal for band rehearsals, live streaming, interviews, and other multi-user monitoring scenarios.

Plug & Play

The transmitter supports 1/8″ or 1/4″ stereo audio input, making it compatible with audio interfaces, mixers, live-streaming devices, and personal monitoring/mixing systems, with ultra-low latency of just 5.8 ms.

Connect a guitar, amp modeler, or audio interface directly, and the C-7 becomes a wireless silent-practice rig.

Button Lock Function

You can double-click the power button to lock the device, so you can stay focused on playing. After the device is locked, double-click the power button to unlock.

5 Monitoring EQ Presets

In-ear monitoring can cause the occlusion effect, resulting in boosted low frequencies and a muffled sound. The C-7 features 5 built-in monitoring EQ presets that effectively reduce this issue, delivering a clearer and more natural monitoring experience.

Stereo & Mono Modes

Stereo mode is suitable for stereo devices such as headphone output interfaces, while Mono mode is designed for Line Out or Aux Out connections from mixers and audio interfaces, meeting different usage scenarios.

Practicing on your own? Mono mode routes the full signal to a single channel for the cleanest,most detailed sound – plug in your guitar, amp modeler, or audio interface and hear every nuance ofyour playing at any hour, without disturbing anyone.

Mono Mode

Stereo Mode

Make Your In-Ear Monitors Wireless

With up to 6 hours of battery life and a transmission range of up to 30 meters, performers can move freely while enjoying every dynamic detail.

Connection

Mono Mode

Stereo Mode

3000mAh Charging Case

The C-7 comes with a dedicated charging case, allowing the transmitter and receiver to be stored and charged directly. With a simple press of a button, the charging process can be activated. When fully charged, the case can recharge the entire wireless system approximately 2 times, providing a total runtime of over 18 hours.

The C-7X4 includes a carry case that accommodates 1 transmitter and 4 receivers.

LCO VS NCM

Why LCO Fits Compact Wireless Devices Better

Lithium Cobalt Oxide · Nickel Cobalt Manganese · Small-Cell Segment

Parameter	LCO Lithium Cobalt Oxide	NCM Nickel Cobalt Manganese
Energy Density	150–200 Wh/kg Higher volumetric density; more capacity per unit volume	150–220 Wh/kg High-nickel variants reach the ceiling, but gap narrows sharply in small cells
Real-World Durability (No BMS)	Superior in Practice High tolerance for non-ideal charge conditions; stable lifespan without precision BMS; resists early failure	Better Lab Numbers Higher theoretical cycle count, but high-nickel NCM demands tight voltage control; accelerated degradation without BMS
Swelling / Deformation Risk	Low Risk Stable crystal structure; low swelling rate; mature ultra-thin cell process	Moderate Risk High-nickel electrolyte is more reactive; requires tighter BMS management
Primary Applications	Thin Consumer Electronics Bluetooth earbuds · Wearables Wireless audio devices · E-cigarettes Wireless instrument accessories	Power & Industrial Power tools · Drones E-bikes · Energy storage Medical equipment
Form Factor / Thinness	Ultra-Thin Advantage Achievable at 2–3mm cell thickness; ideal for slim chassis design	Standard Thickness Primarily cylindrical/prismatic; limited flexibility for thin-form
Cost	Higher Cobalt raw material is volatile, but small-cell process is mature	Lower Diversified raw material mix; better pricing leverage at scale

Technical Conclusion

For 400–600 mAh: LCO Remains the Optimal Choice for Thin Devices

In the 400–600 mAh range, NCM’s lab cycle numbers look impressive — but in micro-devices without a precision BMS, high-nickel NCM’s structural fragility becomes a critical liability. LCO’s tolerance for non-ideal charging, its flatter voltage discharge platform, and its mature ultra-thin cell process make it the clear winner for Wireless effects units, Bluetooth audio devices, and other small consumer electronics where no BMS exists. Real-world durability, not lab data, determines product life.

High BMS-Free Tolerance

LCO withstands cutoff voltage deviations that high-nickel NCM cannot; stable lifespan without protection circuitry — NCM accelerates degradation in identical conditions

Flatter Voltage Platform

LCO’s discharge curve stays flat longer; micro-devices extract every usable mAh without complex step-down circuits — translating to noticeably longer perceived battery life

Ultra-Thin · Anti-Swelling

2–3mm cell achievable; even minor NCM swelling in a tight chassis causes housing damage — an unacceptable failure mode. LCO’s structural stability eliminates this risk entirely

Energy Gap Disappears

At this capacity range, volumetric density differences are negligible — no reason to accept NCM’s structural trade-offs for a theoretical advantage that no longer exists

Application Scenario Breakdown

LCO · Thin Consumer Electronics

Bluetooth Earbuds

Wireless Mic Systems

Wireless FX Units

E-Cigarettes

Smart Cards

Wearables

Ultra-Thin Remotes

NCM · Power & Industrial

Medical Devices

Energy Storage

Industrial Sensors

Drones / UAV

Electric Scooters

Power Tools

E-Bikes

3 Mounting Options

The receiver offers three mounting options: clip, lanyard and magnetic attachment, providing flexible wearing and positioning for different use cases.

Clip

Magnetic Attachment

Lanyard

C-7 Series Models

The C-7 stereo wireless in-ear monitor system is available in multiple configurations, including C-7, C-7X4 and C-7 Receiver, designed to meet different usage scenarios and setup needs.

C-7

1 Transmitter + 1 Receiver + Charging Case

Ideal for personal stereo in-ear monitoring. Additional receivers can be added with C-7 Receiver.

C-7X4

1 Transmitter + 4 Receivers + Carry Case

Perfect for up to 4 users. Easily expandable by adding more C-7 Receivers.

C-7 Receiver

Receiver Only

Designed to work with the C-7 transmitter for one-to-multiple setups, or as a backup receiver to extend usage time.

In the Box

Transmitter x 1

Receiver x 1

Magnetic Patch x 1

USB-C Dual Charging Cable x 1

Neck Lanyard x 1

1/4” Adapter x 1

Charging Case x 1

Transmitter x 1

Receiver x 4

Magnetic Patch x 4

USB-C Dual Charging Cable x 1

USB-C Trio Charging Cable x 1

Neck Lanyard x 4

1/4” Adapter x 1

Carry Case x 1

Receiver x 1

USB-C Charging Cable x 1

Manuals

NUX C-7 User Manual English

NUX C-7X4 User Manual English

Firmwares

NUX C-7 Firmware V1.0.3 macOS

Version: 1.0.3
Update Date: 2026/08/17

NUX C-7 Firmware V1.0.3 Windows

Version: 1.0.3
Update Date: 2026/08/17

NUX C-7 Firmware Update Guide English

C-7 Stereo Wireless In-Ear Monitor System

– Easily turns your in-ear monitors into a wireless system

– Compatible with audio interfaces, mixers, and personal monitor mixers for rehearsals, live performances, and streaming

– Supports stereo / mono input modes

– Supports both automatic and manual pairing modes

– One transmitter supports multiple receivers for flexible system expansion

– Built-in monitoring EQ presets effectively reduce the occlusion effect, delivering a clearer and more natural monitoring experience

– Equipped with a 3000 mAh charging case that can recharge the transmitter and receivers approximately twice, providing over 18 hours of total runtime and keeping the system ready at all times. C-7X4 includes a carrying case

– Compact and portable design for easy carrying

– Receiver supports three mounting options: clip, lanyard, and magnetic attachment

– One-touch frequency hopping and manual channel selection for quick access to the best wireless channel

– 5.8 GHz wireless frequency band

– Up to 6 hours of battery life per charge

– 24-bit high-resolution audio

– Ultra-low latency of 5.8 ms

– Transmission range of up to 30 m

– 96 dB dynamic range

– Supports 16–32 Ω earphones

– Frequency Band: 5.8 GHz ISM (5.725 GHz – 5.85 GHz)

– Transmission Power: <25 mW EIRP

– Operation Range: <30 m

– Latency: 5.8 ms

– Dynamic Range: 96 dB

– THD+Noise: <0.4% @ 1 kHz

– Input Impedance (Transmitter): 3.7 kΩ

– Maximum Input Level (Transmitter): 2.7 Vrms

– Recommended Headphone Impedance (Receiver): 16–32 Ω

– Maximum Output Power (Receiver): 57 mW RMS

– Operating Time: Approx. 6 hours

– Charging Time: Approx. 3 hours

– Battery:

3.7 V / 750 mAh (Transmitter)
3.7 V / 500 mAh (Receiver)
3.7 V / 3000 mAh (Charging Box)

– Dimensions & Weight:

Transmitter: 76 × 42.5 × 30 mm / 50 g
Receiver: 58.5 × 38 × 33 mm / 40 g