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Reddit mentions of Bestsupplier 20 Pieces Clip-on Ferrite Ring Core RFI EMI Noise Suppressor Cable Clip for 3mm/ 5mm/ 7mm/ 9mm/ 13mm Diameter Cable, Black
Sentiment score: 1
Reddit mentions: 2
We found 2 Reddit mentions of Bestsupplier 20 Pieces Clip-on Ferrite Ring Core RFI EMI Noise Suppressor Cable Clip for 3mm/ 5mm/ 7mm/ 9mm/ 13mm Diameter Cable, Black. Here are the top ones.
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Specs:
| Color | Black |
| Height | 1.8 Inches |
| Length | 4 Inches |
| Weight | 0.55 Pounds |
| Width | 2.8 Inches |
As others have said, you can install snap-on ferrite chokes on the cords to your speakers, which should help. The wires in the speaker system act as receiving antennas and pick up the transmitted signal, which then gets amplified and put out through the speakers.
If you can identify the person sending the signal, you can talk to them about it. If they're a ham, they should be able to help you remedy the problem. In my personal experience, though, this is more likely a CB operator with an illegal amplifier. To be honest, most CBers don't care about whatever interference they cause, and generally seem to lack the knowledge to clear up the problems.
Hi. There's a couple things you can do to reduce RFI. Like you said, you can use a shielded cable. It would help if you can connect both ends to ground -- but make sure your electrical mains entrance ground is correct and up to code. You should have a ground rod right below the entrance, and it should be connected to your panel. All lines should be grounded lines, and you should have 3-prong outlets for all circuits. Get an outlet tester to be sure all sockets are wired correctly.
Another thing you can do is add ferrites on all wires going into and out of the HVAC units (power, data, everything). These act as RF filters.
Now bluetooth and microwave ovens use the same frequency band (2.4 GHz). Its not unusual for some low level RF energy to leak out of microwave ovens, and overpower a low-power data connection like bluetooth. But if its more than a low-power leak it may indicate a faulty oven, or a bad ground.
Its possible you have a nearby intermittent transmitter that is affecting things. It could be an airport thing, or maybe a two-way radio like for police or fire, or maybe a neighbor with a CB radio or ham radio. If this is a licensed user and they have a correctly engineered installation, its up to your devices to accept interference. Proper grounding and filtering will help though.
I hope this gives you someplace to start. Good luck.