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Acoustically optimized material used to control resonances

Exceptionally neutral

Exceedingly low distortion

Transparent Midrange

Extended but natural bass

Let It Be

Be (Beryllium) is our highest-awarded IEM. It is known as the master-of-all-music, failure-at-none. Our other IEMs may do better in some genres but for all around excellence Be is where most end their search. Revealing enough to be a true reference IEM but forgiving enough to use on any source.

Beryllium is among the lowest density stable metals, but also has among the highest Young’s modulus values (a ratio of the stiffness) and a very high internal speed of sound.

This results in high efficiency and extremely low distortion as the diaphragm does not bend on its own, moves homogeneously, and dissipates internal energy very well.

This rare combination of performance attributes is what endows the Be IEMs with their freakish ability to compete with the best Beryllium transducer-based headphones on the market, at any price.

Still not sure that this IEM is for you? Then use our amazing Select-A-Tron to guide your IEM choice!

What’s New With the Be?

We’ve done a few great changes to Be – and the whole line – to improve performance and user experience. This starts with a new material for the entire enclosure. We worked for 3 years with Eastman Chemicals, one of the largest plastics companies in the world, to research, develop, and quantify new polymers for acoustic applications.

Our research led us to a specific blend of their Tritan™ copolyester. This material proved to be not just rigid, but acoustically dead with lower energy storage and transmission than the polycarbonate we were using. Stray resonance and noise is lowered even more.

We also refined the external and internal geometry to make it more anti-resonant, so clarity is increased alongside the improvements of the materials used. The result is the most stable, lowest resonant IEM enclosure ever made. All with the lowest weight enclosure possible.

I See a Detachable Cable? What’s That About?

We have also developed our own 2.5mm jack: the IDEEL connector. This connector is the world’s smallest 2.5mm jack, measuring just 3.6mm across, and a tiny 9.5mm mounting depth. This jack allows us to use the very robust 2.5mm TS plug in our tiny IEMs. No more delicate MMCX or difficult 2 pin plastic connectors needed.

Mechanical Elements

Transducer Diaphragm: Beryllium

Transducer Surround: Bonded PEEK

Transducer Frame: 316 Stainless Steel

Transducer Magnet: N48H Grade Neodymium

Enclosure Body: Tritan™ copolyester

Protective Grille: 316 Stainless Steel

Bonding Compound: Cyanoacrylate Adhesive

Sealant Compound: Polyvinyl Acetate

Mounting Tips: Medical Grade Silicone and Urethanes

Connector: IDEEL 2.5mm TS compatible connector (tip hot, sleeve ground)

All components are Finite Element Analyzed for stress, strain, and durability.



Frequency Response

12 Hz to 45 kHz


32 Ohms nominal


100 dB SPL at 1mW in ear

Power Handling

200 mW continuous

Peak SPL

123 dB


Less than 1% THD at 1mW


Physical Properties

Cable Length

1.2 m


2.8 / 16.7 g (IEM/Set)

Operational Temperature

-20 to +50° C

Operational Humidity

0-95% Relative Humidity


31.3 dB (foam eartrip)

Overall Length

21 mm

Body Diameter

12 mm

Nozzle Diameter

6 mm


Be Material Properties

Melting Point

1560 Kelvin

Speed of Sound

12890 meters per second

Young's Modulus

287 Gigapascals

Brinell Hardness

1320 Megapascals


Sound Charts

What's in the box

1.2 meter long cable single 3.5mm TRS to dual 2.5mm TS jack and metal shells

Single Flange Tips – Small, Medium, Large

Dual Flange Tips – Small, Medium, Large

Memory Foam Tips – Small, Medium, Large

Protective Travel Case

Gold Plated ¼” TRS Adapter Jack

Gold Plated Dual Mono Airplane Adapter

5 Year Warranty

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