Periodic Audio Beryllium - In-Ear Monitors

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Sale price$229.95 Regular price$459.95
In stock (5 units)


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.

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
Impedance: 32 Ohms nominal
Sensitivity: 100 dB SPL at 1mW in ear
Power Handling: 200 mW continuous
Peak SPL: 123 dB
THD: Less than 1% THD at 1mW

Physical Properties

Cable Length: 1.2 m
Mass: 2.8 / 16.7 g (IEM/Set)
Operational Temperature: -20 to +50° C
Operational Humidity: 0-95% Relative Humidity
NRR: 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

Included Accessories

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

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