SpinFit CP145 S Silicone Eartips for 5-6mm Nozzles

SpinFit CP145 S are patented silicone replacement eartips engineered to deliver a secure seal, comfortable wear, and full sound for IEMs with 5–6mm nozzles.

These compact CP145 eartips from SpinFit use the brand's flexible silicone profile and patented stem design to adapt to ear canals and small nozzles commonly found on balanced-armature earphones. Sold as two pairs (four pieces) in the S size, they are intended for in-ear monitors and portable earphones that require a 4.5 mm bore internally and fit sound port diameters between 5 and 6 mm. They’re a practical swap for users who want improved comfort and a dependable fit without changing the earphone’s acoustic balance.

How do SpinFit CP145 S eartips improve fit and comfort?

The CP145 S uses soft, flexible silicone and a tapered shape that gently conforms to the ear canal, reducing pressure points from prolonged wear. The design emphasizes both hold and flexibility so tips stay in place during movement while remaining comfortable for long listening sessions.

• Patented flexible stem adapts to canal shape for a snug fit
• Soft silicone reduces ear fatigue versus harder tips
• Compact S size suits smaller ear canals and in-ear monitors

Will these eartips work with my earphones and nozzle size?

SpinFit CP145 S are intended for earphones whose sound-port nozzle measures 5–6 mm across and that accept a 4.5 mm internal bore eartip. They are commonly used with balanced-armature setups and are listed compatible with specific AKG models, but they also fit many other IEMs that meet the nozzle measurement.

• Designed for nozzle diameters of 5–6 mm
• Internal bore: 4.5 mm, suitable for BA driver earphones
• Known compatibility: AKG N30, AKG N40; included with AKG N5005

How do these tips affect sound and isolation?

Because the CP145 S maintains an acoustic path consistent with the original nozzle size, you’ll retain the earphone’s intended tonal balance while potentially improving low-frequency response from a better seal. Isolation improves when the tip seats correctly, though exact changes vary with ear anatomy and source gear.

• Preserves original acoustic alignment for accurate sound
• Improved bass and noise isolation when achieving a proper seal
• Small bore helps match balanced-armature outputs without altering timbre

What’s included and how do I install them?

The package contains two pairs (four pieces) of SpinFit CP145 S silicone eartips. Swapping is straightforward: remove the original tip, align the CP145 stem with the nozzle, and press until it seats firmly. Clean tips and nozzles periodically to maintain hygiene and optimal fit.

• Contents: 2 pairs (4 pieces) of SpinFit CP145 S eartips
• Installation: push onto the nozzle until fully seated; pull straight off to remove
• Maintenance: wipe with a soft cloth and mild soap; avoid solvents

Who is this for: Musicians, commuters, audiophiles, and anyone using IEMs with small nozzles who want a more secure, comfortable seal without changing their earphones’ sound signature. These tips are particularly suited to users of balanced-armature earphones and models like the AKG N30, N40, or N5005 that require a 4.5 mm bore and 5–6 mm nozzle compatibility.