Why Your IEMs Sound Thin (It Is Almost Always the Tips)

The single most common problem posted about in-ears, and the cheapest one to fix.

In-ear monitors depend on an airtight seal in your ear canal. Without one, bass is the first thing to go, because low frequencies need a sealed volume to pressurize. The result reads as thin, bright, harsh, or simply as no bass at all.

How to confirm it in ten seconds

While music is playing, press each earpiece gently further into your ear. If the bass arrives when you press and leaves when you let go, you have a seal problem. Nothing else is wrong with the headphone.

Fixes, in order of how often they work

• Go up a tip size. Most people wear tips that are too small, because a snug correct fit feels larger than expected at first.
• Try foam tips. They expand to the canal shape and forgive irregular anatomy that silicone cannot.
• Insert deeper, using the standard technique: reach over your head, pull the top of your ear up and back to straighten the canal, then insert and release.
• Use different sizes in each ear. Asymmetric ear canals are completely normal and most tip kits contain enough pairs to mix.
• Check the nozzle. A blocked filter or wax buildup mutes output and is easily mistaken for a dead driver.

Tips also change the treble

Bore width is not cosmetic. A narrow bore tends to tame treble and thicken the midrange; a wide bore opens the top end and can make a bright IEM brighter. Foam generally rolls off some treble relative to silicone. If an IEM is close to right but slightly too sharp or slightly too dull, the tip is a real tuning control and it costs a few dollars.