Analog Audio Connection from PA System to Spoke Connect
Spoke Connect expects a stereo TRS 3.5 mm line-in. When connecting an AtlasIED PA system to the Spoke Connect IoT device via a 3.5 mm audio cable, use the following tips to ensure a clean, functional setup.
1. Confirm Audio Output from PA System
- Check if the system provides an analog audio output (e.g., line-out, aux out, or monitor out).
- Outputs may be XLR, RCA, or Phoenix-style terminal blocks — adapters/conversion may be required.
Tip: If only XLR or terminal blocks are available, you will need an XLR-to-3.5 mm cable or a line-out adapter.
2. Use the Correct Cable and Adapter
- The Spoke Connect device accepts 3.5 mm analog line-level input.
- If the PA output is RCA, use an RCA to 3.5 mm stereo cable.
- If the PA output is XLR, use an XLR to 3.5 mm TRS cable or XLR to 1/4" to 3.5 mm chain.
- For terminal blocks, consult the AtlasIED wiring diagram to identify the left/right/ground pins and use an adapter or custom cable.
Tip: Avoid using mic-level signals—Spoke Connect expects line-level audio. Use a DI box or line-level shifter if needed.
3. Test the PA Output with a Known Device
- Connect the PA output to a laptop line-in port or a portable speaker using the same 3.5 mm cable.
- Alternatively, plug a headset or headphones into the output to check for signal presence (if safe to do so).
Tip: If using a laptop, use audio recording software (e.g., Audacity) to confirm that audio is being received.
4. Connect to Spoke Connect to Verify Audio Detection
- Plug the 3.5 mm cable into the Spoke Connect input port.
- Confirm that Spoke Connect is powered on, network-connected, and actively listening for input
- Monitor the Spoke dashboard or app to see if audio waveforms are detected.
Tip: If no audio is detected, swap cables, check the connector seating, and validate that the PA system is currently broadcasting.
5. Use Microphone as a Temporary Fallback
- Temporarily place a mic near a PA speaker and plug into Spoke Connect via a 3.5 mm mic input port or through a laptop configured as a passthrough.
Tip: Useful for troubleshooting but not ideal for production use.
6. Eliminate Ground Loop Hum
If you hear buzzing or humming, use a ground loop isolator between the PA system and Spoke Connect.
What is a Ground Loop Isolator?
A ground loop isolator is a device that removes electrical noise caused by differing ground potentials between connected equipment. It uses transformers to pass the audio signal magnetically while breaking the electrical connection.
When to Use
- You hear a 50Hz or 60Hz hum after connecting devices.
- Your devices are powered from different electrical circuits.
Types of Ground Loop Isolators
- 3.5 mm ground loop isolator
- RCA ground loop isolator
- XLR isolation transformer
Keep cable lengths short and away from power lines to reduce interference.
7. Document the Working Configuration
- Label all cables and ports once working.
- Save wiring diagrams and connection notes for future use.
- Consider placing a line splitter if additional outputs are needed later.
For questions or technical support, please contact the Metcove support team at spoke@metcove.com.