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Custom IEMs
A custom IEM can only fit as well as the impression it’s built from. Ask an audiologist for full-shell, open-mouth impressions taken with a bite block, with the canal past the second bend and the whole concha, helix and tragus filled. Check them against the photos below before you send them to us.
The impression
AAW builds every shell from this area of the ear. Anything the impression misses, the shell can’t follow.
Extended past the second bend, with a smooth, complete tip. A short canal can lose the seal.
ManufacturerAAWThe full concha bowl including its edge, the helix, the tragus and the anti-tragus. These hold the IEM in place.
ManufacturerAAWOpen, with a bite block, in the same jaw position for both ears until the material has cured. Your ear canal changes shape when your jaw moves, so the IEM keeps its seal when you talk or sing.
ManufacturerAAWMedical-grade silicone impression material suitable for deep impressions.
ManufacturerAAWA left and a right impression, clearly labelled.
ManufacturerAAWBefore you go
Have your impressions taken by an audiologist or another licensed professional. Please don’t try a DIY kit: the material goes deep into the ear canal. The clinician should look into your ear canals first, confirm it is safe to go ahead and place the otoblock (the small foam or cotton stop that protects your eardrum).
Show your audiologist this page, or ask for: “full-shell, open-mouth impressions with a bite block, medical-grade silicone, canal past the second bend, full concha and helix, otoblocks left in”.
Have your ears cleaned beforehand if you tend to build up wax: it gives a cleaner impression.
Email sales@null-audio.com with your city and we’ll do our best to help you find one.
Step by step
Bite on the bite block and keep the same jaw position for both ears until the material has fully cured.
After looking into the ear, the clinician places the otoblock beyond the second bend when appropriate. Leave it attached to the impression when you send it.
Fill the canal first, then the concha and helix, without trapping air.
Taking the impression out too early can bend the canal or tear the fine details. After removal, the clinician checks both the ear and the impression.
Check them
Look at both impressions from the front, back, top and bottom. A good pair is complete from every side.
Check them
If an impression looks like any of these, ask your audiologist to take it again before you send it. A retake on the day is quicker than a refit later.
Send them
Let both impressions cure fully, label them left and right, and pack them in a crush-resistant box with your order number, name, email and phone number.
ManufacturerAAWTrim the canal, shave the concha, remove the otoblocks or squeeze the impressions into a small container.
ManufacturerAAWNull Audio, Attn: Lab Team, #01-03, LHK2 Building, 76 Playfair Road, Singapore 367996. Tel: +65 8731 5476.
Null AudioNull AudioUse a service with tracking. From overseas, declare the impressions under USD 200 (see Shipping & Return).
Null AudioNull AudioIf your audiologist can scan your impressions, or scan your ears directly, email the STL or HPS files with your order number to support@null-audio.com: one file per ear, named left and right. Keep the physical impressions until we confirm the files work.
ManufacturerAAWQuestions
No. The material goes deep into the ear canal, so an audiologist or another licensed professional should look into your ears first and place the otoblock. DIY impressions also tend to stop short of the second bend.
Your ear canal changes shape when your jaw moves. An open-mouth impression taken with a bite block keeps the seal when you talk, sing or chew.
Yes. Email the STL or HPS files with your order number to support@null-audio.com, one file per ear. The scan must go past the second bend and include the whole concha.
At our studio, 76 Playfair Road, for SGD 50. It takes 10–20 minutes. Book a time online.
Refits are free within 30 days of delivery. For overseas orders, return shipping is charged separately. See Warranty.
Custom IEMs
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