Introduction
This manual provides comprehensive instructions for the Plantronics Blackwire 3320 Wired, Dual-Ear (Stereo) Headset with Boom Mic. Designed for professionals, this headset offers premium audio quality, plug-and-play simplicity, and reliable performance for PC, Mac, or cell phone connections via USB-A. It is certified for Microsoft Teams and compatible with other leading collaboration and voice platforms.
What's in the Box
- Plantronics Blackwire 3320 Headset

Setup
The Blackwire 3320 headset is designed for simple plug-and-play operation.
- Connect to Device: Insert the USB-A connector of the headset into an available USB-A port on your PC, Mac, or compatible cell phone.
- Automatic Recognition: Your operating system should automatically detect and install the necessary drivers for the headset. This process typically takes a few moments.
- Select as Audio Device: In your computer's sound settings or your communication application (e.g., Microsoft Teams, Zoom), select "Plantronics Blackwire 3320" as your default audio input (microphone) and output (speaker) device.

Operating Instructions
Wearing the Headset
The Blackwire 3320 is a dual-ear (stereo) headset designed for comfort during extended use.
- Adjust Headband: Extend or retract the headband to ensure a comfortable and secure fit over your head.
- Position Ear Cushions: The ear cushions are soft foam and the speakers pivot 180 degrees to conform to your ears.
- Position Microphone: Adjust the flexible microphone boom so the microphone is approximately two finger-widths from the corner of your mouth.

In-line Controls
The headset features an in-line control unit for easy management of calls and audio.
- Volume Up/Down: Use the '+' and '-' buttons to adjust the listening volume.
- Mute/Unmute: Press the microphone icon button to mute or unmute your microphone.
- Call Answer/End: Press the call button (typically a phone icon) to answer or end a call.
- Microsoft Teams Button: For Microsoft Teams certified models, a dedicated Teams button allows for quick access to Teams functions.

Plantronics Hub App
For advanced settings and firmware updates, download and install the Plantronics Hub application on your PC or Mac. This software allows you to customize headset settings, check battery status (if applicable), and receive notifications for new firmware.

Features
- Connectivity: Easily connects to PC or Mac via USB-A. Certified for use with Microsoft Teams and compatible with other leading collaboration and voice platforms.
- Target User: Ideal for professionals requiring premium audio quality, plug-n-play simplicity, reliability, and value in a communication headset.
- Audio Performance: Delivers clear, natural, and rich audio with wideband audio support, a flexible noise-canceling microphone, and enhanced digital signal processing (DSP). Includes SoundGuard acoustic limiting for protection against sounds above 118 dBA.
- Comfort: Features a padded headband and soft foam ear cushions for extended wear. The headset is fully adjustable with 180-degree pivoting speakers and a flexible microphone boom for optimal positioning.
Maintenance
To ensure the longevity and optimal performance of your Plantronics Blackwire 3320 headset, follow these maintenance guidelines:
- Cleaning: Gently wipe the ear cushions and headset surfaces with a soft, dry, lint-free cloth. Do not use liquid cleaners or abrasive materials.
- Storage: When not in use, store the headset in a clean, dry place away from extreme temperatures and direct sunlight. Avoid tangling the cable.
- Cable Care: Do not pull on the cable to disconnect the headset. Always grasp the USB-A connector. Avoid sharp bends or kinks in the cable.
Troubleshooting
| Problem | Solution |
|---|---|
| No audio from headset / Cannot hear others |
|
| Microphone not working / Others cannot hear me |
|
| Sound quality is poor or distorted |
|
Specifications
| Feature | Detail |
|---|---|
| Model Name | Blackwire 3300 Series (BW3320-M USB-A) |
| Connectivity Technology | Wired (USB-A) |
| Wearing Style | Dual-Ear (Stereo), Over-the-head |
| Microphone | Flexible Boom Mic, Noise-Canceling |
| Audio Performance | Wideband audio, Enhanced Digital Signal Processing (DSP) |
| Hearing Protection | SoundGuard (acoustic limiting for sounds above 118 dBA) |
| Controls | In-line controls for volume, mute, call answer/end, dedicated Teams button (on certified models) |
| Ear Cushions | Soft Foam |
| Headband | Padded, Adjustable |
| Weight | 3.4 ounces (approx. 96 grams) |
| Product Dimensions | 8.4 x 7.3 x 2.2 inches |
| Material | Plastic |
| Color | Black |
| Compatible Devices | PC, Mac, Cellphones (via USB-A) |
| Frequency Response | 20 Hz - 20,000 Hz |
| Impedance | 32 Ohm |
Warranty and Support
The Plantronics Blackwire 3320 headset comes with a 2-year global warranty.
For technical support, warranty claims, or to download the latest Plantronics Hub software and firmware updates, please visit the official Plantronics (Poly) support website. You can often find detailed FAQs and additional resources there.
Note: Always refer to the official Plantronics website for the most current support information and resources.





