Beltone SF3 Domes – precision fit for SureFit 3 receivers

Beltone SF3 domes are silicone tips built for hearing aids using the SureFit 3 (SF3) receiver system. These domes sit at the end of the receiver wire, sealing the ear canal to deliver amplified sound directly while helping stabilize the hardware against movement.

Dome types and how they affect your sound

• Open SF3 domes allow ambient sound in and reduce the “plugged” feeling. Best when low frequencies are relatively intact.
• Closed SF3 domes provide more isolation and allow deeper amplification, useful when you require more gain in mid and low frequencies.
• Power SF3 domes deliver the tightest seal, reducing sound leakage and maximizing output when you have stronger hearing loss.

If you frequently hear whistling when your dome shifts, or struggle to get enough volume, switching to a closed or power dome may solve that issue.

Choosing the right dome size

SF3 domes come in sizes (e.g. 5 mm, 7 mm, 10 mm) to match your ear canal depth. The correct length ensures a snug, effective seal without discomfort. Too short may allow leakage; too long might press uncomfortably.

When and how to replace

You should replace your SF3 dome every 4 weeks, or sooner if it discolors, hardens, or starts affecting sound quality. Here’s how you do it:

• Gently twist and pull off the old dome from the receiver tip
• Clean the receiver tip with a soft cloth
• Push the new dome onto the receiver until it fits snugly
• Verify that it doesn’t slip off easily

Real benefits you’ll notice

A well-sealed SF3 dome helps reduce feedback by minimizing sound escaping forward. You’ll hear clearer speech with fewer distracting artifacts. The soft silicone shape molds to your canal, improving comfort over long wear. Because it keeps out wax, moisture, and dirt from entering the tip area, the dome helps protect internal components and preserves consistent performance between changes.

Want help picking domes?

Japebo can help you match the right style (open, closed, or power) and size to your SF3 receiver and hearing needs. Contact us via chat or email at info@japebo.com.