1. Introduction
Thank you for choosing the OneOdio Monitor 40 Wired DJ Headphones. These headphones are engineered to deliver high-fidelity audio for professional monitoring, DJing, and general listening. Designed for comfort and durability, the Monitor 40 features soft padded ear cushions, an adjustable headband, and robust construction to provide an optimal listening experience.
This manual provides essential information on setting up, operating, maintaining, and troubleshooting your headphones. Please read it carefully to ensure proper use and to maximize the lifespan of your product.
2. Package Contents
Verify that all items listed below are included in your package:
- OneOdio Monitor 40 Wired DJ Headphones
- 3.5mm to 3.5mm Audio Cable
- 3.5mm to 6.35mm Coiled Audio Cable
- Carrying Pouch
- User Manual

Image: All components included in the OneOdio Monitor 40 headphone package, neatly arranged.
3. Setup
3.1 Connecting the Audio Cable
- Identify the audio input port on your OneOdio Monitor 40 headphones. There are two ports: a 3.5mm port and a 6.35mm port.
- Select the appropriate cable for your audio source: use the 3.5mm to 3.5mm cable for devices with a 3.5mm output (e.g., smartphones, laptops), or the 3.5mm to 6.35mm coiled cable for devices with a 6.35mm output (e.g., DJ mixers, audio interfaces).
- Insert the smaller 3.5mm end of the chosen cable into the corresponding 3.5mm port on the headphone earcup.
- Insert the other end of the cable (either 3.5mm or 6.35mm) into the audio output jack of your device.
3.2 Adjusting for Comfort
For optimal sound and comfort, adjust the headphones to fit your head properly:
- Headband Adjustment: Gently slide the earcups up or down along the headband until they rest comfortably over your ears. The headband is designed to be adjustable and stretchable.
- Earcup Rotation: The earcups can rotate 90 degrees for single-ear monitoring and can also flip 180 degrees for compact storage. Ensure they are positioned flat against your ears for the best sound isolation.

Image: Visual representation of the Monitor 40's foldable design, 90-degree earcup rotation, and 180-degree earcup flip for portability and single-ear monitoring.
4. Operating Instructions
4.1 Basic Listening
Once connected to your audio source, simply play your desired audio. Adjust the volume directly from your audio source device.
4.2 Shared Port Technology
The OneOdio Monitor 40 headphones feature dual audio input ports (3.5mm and 6.35mm) that can also function as output ports. This allows for music sharing without the need for a splitter:
- Connect your headphones to an audio source using one of the ports (e.g., 3.5mm to your smartphone).
- Connect a second pair of headphones (or another audio device) to the remaining unused port on your Monitor 40 headphones.
- Both sets of headphones will now receive audio from the original source.

Image: Illustration of two users sharing audio from a single source using the shared port technology of the OneOdio Monitor 40 headphones.
4.3 Professional Monitoring
The Monitor 40 headphones are designed for DJ and studio monitoring. Their robust construction and sound isolation properties make them suitable for environments where clear audio is critical.

Image: The OneOdio Monitor 40 headphones positioned on a professional DJ mixer, highlighting their intended use in a studio or performance setting.
5. Maintenance
5.1 Cleaning
- Use a soft, dry cloth to wipe the exterior surfaces of the headphones.
- For ear cushions, gently wipe with a slightly damp cloth and allow to air dry completely before use. Avoid using harsh chemicals or abrasive cleaners.
5.2 Storage
When not in use, store your headphones in the provided carrying pouch to protect them from dust and scratches. The foldable design allows for compact storage.
6. Troubleshooting
6.1 No Sound
- Ensure the audio cable is securely plugged into both the headphones and the audio source.
- Check the volume level on your audio source device.
- Test the headphones with a different audio source or cable to rule out a faulty component.
6.2 Poor Sound Quality
- Ensure the audio cable connections are firm. Loose connections can cause static or intermittent sound.
- Verify that the audio source is playing high-quality audio files.
- Adjust the equalizer settings on your audio device if available.
6.3 Discomfort During Use
- Re-adjust the headband and earcups to find a comfortable fit.
- Take short breaks during extended listening sessions.
7. Specifications
| Feature | Detail |
|---|---|
| Model Number | Monitor 40 |
| Product Dimensions | 17.5 x 16.5 x 10.5 cm |
| Item Weight | 600 g |
| Included Components | Audio Cables |
| Country of Origin | China |
| Manufacturer | OneAudio Co., Limited |
| Release Date | 1 January 2022 |
8. Warranty and Support
OneOdio products are designed for reliability and performance. For information regarding warranty coverage, technical support, or service inquiries, please refer to the warranty card included in your package or visit the official OneOdio website.
Please retain your proof of purchase for any warranty claims.





