How Long Do Custom IEMs Take?

Custom IEMs take 6–8 weeks to build at AAW, counted from the day the lab receives your ear impressions or 3D scan, not from the day you order. Mockingbird and Canary Pro take 8 weeks. FedEx then adds 1–3 working days. If a date is close, the Express service brings the build to about 3 weeks for USD 150.

This guide is for anyone working to a date: a tour, a wedding, a conference keynote or the first service with a new worship team. It walks through how long custom IEMs take at each stage, from ordering to the refit window after delivery, and shows how to plan back from the day you need them. The short version is that the build is the longest step, but rarely the one that causes trouble.

The timeline, step by step

A custom IEM is an in-ear monitor whose shells are cast from impressions of one person's ears. That single fact shapes the whole schedule: nothing can be built until the lab has your ears in some form. The order itself takes minutes, on a product page or in the Custom Builder, where you choose shells, faceplates, a logo and engraving.

Steps 2 and 3 are the ones you control. A set of impressions that sits in a drawer for a fortnight adds a fortnight to the date at the end.

How long do custom IEMs take to build?

Most AAW customs take 6–8 weeks from the day we receive your impressions or scan, plus shipping. The two flagships with the largest driver counts, Mockingbird and Canary Pro, are quoted at 8 weeks. Shipping comes on top of every figure below.

Each custom arrives with a 1.2 m detachable Null Audio cable on standard 0.78 mm 2-pin sockets, a cleaning brush and cloth, an AAW pouch and a 1-year warranty. A reshell, which moves the drivers of IEMs you already own into custom shells, also takes 6–8 weeks; complex reshells of 64 Audio, JH Audio, Empire Ears and qdc models take 8–10 weeks. Our IEM reshell guide covers that route in full.

How long do ear impressions take?

An ear impression is a soft mould of the ear canal and outer ear, from which the shells are made. In Singapore, we take them at our studio for SGD 50, by appointment; it takes 10–20 minutes. Book a visit and the impressions can go straight to the lab.

The procedure is standard in audiology. The clinician first looks into each ear with an otoscope, places a small block in the canal to protect the eardrum, fills the canal and outer ear with impression material, and removes it once set. A good impression reaches the second bend of the canal and fills the concha bowl, without gaps or bubbles (Minnesota Department of Health).

Outside Singapore, an audiologist can take them, and a 3D scan is better still: STL or HPS, one file per ear, past the second bend, with the whole concha, taken open-mouth with a bite block. Open-mouth impressions matter because jaw movement commonly stretches the ear canal and increases its volume (The Hearing Review). A scan arrives by email the same day. Physical impressions travel by post, tracked, in a crush-resistant box, declared under USD 200. Our ear impressions guide has the full checklist for your audiologist.

Can a custom be built faster?

Yes. Our Express service builds a custom IEM or a reshell in about 3 weeks, for USD 150. The 3 weeks count from when your impressions arrive or from when you request the rush, whichever is later, so ordering Express a month after sending impressions does not backdate it.

Express has conditions worth knowing before you plan around it:

• It is non-refundable.
• There is no rush over Chinese New Year.
• Reshells that add drivers or change the tuning can't be rushed.
• Email sales@null-audio.com before paying, so we can confirm a slot.

What can make custom IEMs take longer?

Chinese New Year

Express is not available over Chinese New Year, and the holiday is worth marking on any plan that runs through the first months of the year. In 2027, Chinese New Year falls on 6 and 7 February (Ministry of Manpower). If your date falls in February or March, send impressions well before the new year.

Old impressions

Physical impressions shrink with time, so an old set usually needs retaking. The Hearing Review notes that silicone impression materials typically shrink 0.1% to 0.7% in 7 days, and acrylic impressions about 3% over the same period (The Hearing Review). Impressions from a pair made years ago are not a shortcut.

Narrow canals and refits

If your canals are very narrow, send a scan or photos first so the lab can suggest a model; it saves a false start. And if the fit is not right on arrival, the refit is free within 30 days of delivery, but it means the monitors travel back to us. Overseas customers pay that shipping.

Planning back from a date

Work backwards from the day itself, and give the refit window room to work. Here is the sequence we suggest for a standard build.

A touring musician should have the monitors in hand before the rehearsals, not the first show. For a wedding, a speaker or a conference keynote, the aim is to wear them through a full run-through. A church team ordering several at once should see group orders: in Singapore we can take impressions for the whole team in one session. Our page on IEMs for worship teams and churches and the guide to custom or universal IEMs for church teams cover the choices around it.

If 12 weeks is no longer possible, Express usually closes the gap. If even 3 weeks is too long, a universal IEM ships from stock; custom vs universal IEMs sets out what changes. Musicians who also need hearing protection can add Noise Guard custom earplugs from the same impressions appointment; they take 4–5 weeks, or 6–8 weeks around Chinese New Year.

Where to start

Pick the model, then fix the impression date before anything else. In Singapore, book a visit to our studio; overseas, follow the ear impressions guide. If you are working to a date inside 8 weeks, write to our team first and we will tell you honestly what is possible. Every custom carries our warranty from the day it arrives.

Frequently asked questions