Introduction
The Plantronics Blackwire 3325 is a wired stereo headset designed for clear communication. It features a flexible boom microphone and offers versatile connectivity options. This headset is suitable for use with PCs, Macs, mobile devices, and tablets, supporting various communication platforms such as Microsoft Teams and Zoom.

Image: Plantronics Blackwire 3325 headset showing the earcups, headband, boom mic, and the inline control with USB-A and 3.5mm connectors.
What's in the Box
- Plantronics Blackwire 3325 Wired Stereo Headset
Setup Instructions
- Connect to PC/Mac via USB-A:
Locate an available USB-A port on your computer. Plug the USB-A connector of the headset's inline control into the USB-A port. The operating system should automatically detect and install the necessary drivers. The headset will be ready for use.
- Connect to Mobile/Tablet via 3.5 mm Connector:
Locate the 3.5 mm audio jack on your mobile device or tablet. Plug the 3.5 mm connector from the headset's inline control into the audio jack. The headset will function as an audio input/output device.
- Adjusting the Headset:
Adjust the headband for a comfortable fit. Position the flexible boom microphone approximately two finger-widths from the corner of your mouth for optimal voice pickup. The speakers pivot 180 degrees for personalized comfort.
Operating Instructions
Inline Controls:
The headset features an inline control unit for easy management of calls and audio.
- Volume Up/Down: Press the '+' or '-' buttons to adjust the listening volume.
- Mute/Unmute Microphone: Press the microphone icon button to mute or unmute your microphone during a call.
- Call Answer/End: Press the call button (typically a phone icon) to answer an incoming call or end an active call.
Audio Performance:
The headset provides clear and natural audio with wideband audio support. The flexible noise-canceling microphone helps reduce background noise for your callers. Enhanced Digital Signal Processing (DSP) further improves audio quality. SoundGuard technology offers acoustic limiting to protect against sound levels above 118 dBA.
Maintenance
- Cleaning: Use a soft, dry cloth to clean the headset. Avoid using liquid cleaners or solvents.
- Storage: Store the headset in a cool, dry place when not in use. Avoid extreme temperatures.
- Cable Care: Do not pull on the cable to disconnect the headset. Always grasp the connector. Avoid sharp bends or kinks in the cable.
Troubleshooting
- No Audio or Low Volume:
- Ensure the headset is securely connected to the USB-A port or 3.5 mm jack.
- Check the volume settings on your computer or mobile device.
- Verify that the headset is selected as the default audio input/output device in your operating system's sound settings or communication application (e.g., Teams, Zoom).
- Adjust the volume using the inline controls.
- Microphone Not Working:
- Ensure the microphone is not muted using the inline control.
- Check the microphone settings in your computer's sound preferences or communication application.
- Confirm the headset is selected as the default microphone device.
- Ensure the boom microphone is positioned correctly near your mouth.
- Sound Distortion or Static:
- Try connecting the headset to a different USB port or 3.5 mm jack.
- Ensure there are no strong electromagnetic interference sources nearby.
- Update your computer's audio drivers.
Specifications
| Model Name | Blackwire 3325 USB-A |
| Connectivity Technology | Wired (USB-A, 3.5 mm Jack) |
| Noise Control | Active Noise Cancellation (Microphone) |
| Audio Performance | Wideband audio, DSP, SoundGuard acoustic limiting |
| Frequency Response | 20000 Hz (Headphones) |
| Compatible Devices | PCs, Laptops, Desktops, Mobile Devices, Tablets |
| Control Type | Inline Remote (Volume, Mute, Call Control) |
| Material | Faux Leather (Ear Cushions) |
| Item Weight | 4.6 Ounces |
| Product Dimensions | 59.06 x 1.97 x 1.97 inches |
Warranty and Support
For warranty information and technical support, please refer to the official Plantronics (Poly) website or contact their customer service. Keep your purchase receipt for warranty claims.
Product support resources may include:
- Online FAQs
- Driver and software downloads
- Contact information for technical assistance







