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Specs at a glance: Blue Ella

Driver Type
Planar magnetic

Impedance
50 ohms Passive, 10 ohms Active

Frequency response
20Hz-20kHz

Amplifier
Output power: 250mW
THD+N: < 1% (94 dB SPL, from 20 Hz to 20 kHz)
Frequency response: 20Hz-20kHz
SNR: >101 dB
Noise: < 20 uV

Battery
1000mAh

Weight
481g (16.97 oz)

Size
Outer dimensions (closed): 21cm x 14cm x 12cm
Outer dimensions (open): 18cm x 29cm x 12cm

Other perks
Soft carry case
1.2-meter audio cable with Apple iPhone/iPad controls and microphone
3 metre audio cable
3.5mm to 1/4” adaptor

Price

£675 / $700

Planar magnetic headphones, which use a thin film suspended between neodymium magnets to deliver sound quite unlike that of typical dynamic and balanced armature headphones, are traditionally the reserve of the well-heeled audiophile.

The sound quality is, according to fans, clearer, sharper, and more detailed and only surpassed by electrostatic headphones, which use electricity instead of magnets to vibrate a thin film to push sound to the ears.
Both technologies are more complex to manufacture than traditional dynamic drivers, and both require more volume to function.

The result is that planar magnetic headphones like those from US-based MrSpeakers cost well over £1,000/$1,000, while the headphone amps required to drive them cost hundreds if not thousands of pounds more on top.
Blue, famous for its line of podcast microphones, hopes to make planar magnetic technology less intimidating with its Ella headphones (buy here).

At £675/$699, Ella is hardly cheap (and there are sets like the Oppo PM-3 that are cheaper at £350).

But they combine the coveted headphone technology with an internal amplifier (250mW) that allows them to be used with everyday devices like smartphones and laptops, as well as with a high-end audio setup.
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