Could these work for a 3.5mm double coil wire?

These cores come in various sizes, that you need 3.5 mm is accommodated in a 1.5 mm cable at least up to 3.5 mm maximum, and if it does not work, you can use the core of 5 mm, which fits into a 3.5 mm cable at least up to 5 mm and I think that the cable you have should fit well in one of those two cores.

what frequencies do these absorb

that depends on the length of cable they are being used on. It's the cables that act as antennas, both radiating and receiving signals. It may take multiple units on your cables to reduce/eliminate the bothersome signals.

Will these filter out a radio station leaking into my audio

It depends on the strength and the proximity of the transmitting station. Under most conditions, you may be able to minimize or eliminate incoming radio frequency interference by clamping these onto your speaker leads. It may take more than one if the signal is very strong.

20 Pcs Snap On Ferrite Core Cord Ring Rfi Emi

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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NZ$28

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In stock

Sold byAmazon New ZealandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔒 Lock in clarity, lose the noise—because your signal deserves the best.

SNAP GO CONVENIENCE - Tool-free, double snap design lets you install in seconds—no hassle, no downtime.
SLEEK DISCREET DESIGN - Matte black finish blends seamlessly with your professional workspace or home office.
VERSATILE APPLICATION RANGE - Ideal for USB, HDMI, power cords, audio cables, and more—future-proof your tech setup.
UNIVERSAL FIT FOR EVERY CABLE - Five precision sizes (3, 5, 7, 9, 13mm) to perfectly secure and filter your cables.
CRYSTAL CLEAR SIGNAL INTEGRITY - Effectively suppresses electromagnetic interference for flawless audio, video, and data transmission.

This 20-piece set of snap-on ferrite core cable clips includes five sizes (3mm to 13mm) designed to reduce electromagnetic interference (EMI) and radio frequency interference (RFI) across a wide range of cables. Easy to install with a double snap mechanism, these black ferrite rings improve signal integrity for audio, video, USB, power, and industrial cables, making them an essential upgrade for any professional or tech-savvy workspace.

Specifications

ASIN	B01N0AV746
Best Sellers Rank	#205,950 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #43 in Electromagnetic Interference Filters
Date First Available	November 9, 2016
Is Discontinued By Manufacturer	No
Item Weight	4.2 ounces
Item model number	43237-2
Manufacturer	FORSUN
Package Dimensions	6.18 x 3.94 x 1.77 inches

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NZ$28

Duties & taxes included

In stock

Sold byAmazon New ZealandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to New Zealand.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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20 Pcs Snap on Ferrite Core Cord Ring RFI EMI Noise Filter Suppressor Cable Clip for 3.5mm/5mm/7mm/9mm/13mm Diameter Cable, Black

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