Amiron Wireless

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NO SMOOTHING is applied to the shown plots. Most measurement sites have some smoothing applied which ‘irons flat’ sharp peaks and ‘wiggles’. I do not use smoothing because some info about sound quality is lost when plots are smoothed.

Aside from a small correction of the microphone itself also some correction in the lowest frequencies is applied to the plots to compensate for the perceived loss of bass when using headphones. This is described HERE in more detail.
A ‘horizontal‘ frequency response curve on the shown frequency response plots on this website thus indicates a perceived ‘flat’ tonal signature.

ALL measurements are made with a good SEAL on a flatbed measurement rig.
The shape of your head, bone structure, pad size, pad ‘softness,  (compliance), hair or no hair and or wearing glasses may (drastically) change the frequency response of some headphones, so… your personal experience may differ substantially from these plots.

Frequency response (tonal balance) is the most sound-determining aspect of headphones. A horizontal line shows audible neutral response in the plots on this website. Deviations in different severities at different frequency bands have an effect on the sound character.
The bigger the deviation the stronger the effect.

Below an aid to help determining the sound character of headphones with relation to the frequency response.

sound descriptions mine

post separation
Beyerdynamic Amiron Wireless

Amiron WL

The Beyerdynamic Amiron Wireless is an closed over-ear (circumaural) dynamic headphone. This headphone is clearly intended for portable usage.
At around $ (and  €) 700.- this isn’t exactly a cheap portable headphone. You do, however, get one of the best sounding Bluetooth headphones around.
The bluetooth part is NOT tested here, only the headphone in passive mode (wired with the supplied 3.5mm cable).
The bluetooth part seems to be well taken care off with a dedicated EQ app (downloadable for IoS and Android) as well to adjust the sound to your preferences.

Some of the bluetooth related data:
Bluetooth range: < 10 m
1050 mAh battery gives approx. 30 hours of runtime and is charged with an USB-C cable which I think is a better standard than mirco-USB. The battery can be charged in 2 hours or less depending on the battery charge.
The supported functionality bluetooth 4.2 ‘profiles’ are:
A2DP (Advanced Audio Distribution Profile) allows for high quality audio transmission.
AVRCP (Audio/Video Remote Control Profile) allows the bluetooth device to control the device it is connected to.
HFP (Hands Free Profile) supports hands free calling when connected to a phone so you can take and make phone calls using the Amiron Wireless.
HSP (HeadSet Profile) which allows for calls to be answered, ended, and the volume level adjusted from the Amiron. This is actually needed in conjunction with A2DP so that the user can switch between listening to music and making calls.
GAVDP (Generic Audio Video Distribution Profile) takes care of the basis for A2DP and VDP (Video Distribution Profile) which is for transmitting video and audio streams.
Supported codecs: Qualcomm® aptX™, aptX™ LL, aptX™ HD, AAC, SBC

The headphone is comfortable and not particularly lightweight but not nearly as heavy as some higher end planar headphones. The cups can be adjusted over a considerable range so should fit well on most heads. Due to the weight and medium clamping force the Amiron easily falls of the head when moving your head around quickly so not really suitable for usage during activities but otherwise well suited for commuting.
There is no noise cancelling so the headphone’s isolation is dependent on a good seal and its cups/pads.

The data below is from the Amiron Wireless in wired mode (so using the supplied 3.5mm audiocable)

specifications:

Type: over ear, closed
Usage: portable
Driver type: dynamic (Tesla)
Pads: micro-fibre
Foldable: No
Headphone cup connector: 3.5 mm TRS
Cable entry: single sided (Left)
Cable: 1.2m with gold plated 3.5 mm TRRS plug and remote control
Driver size: 45 mm
Nom. power rating: 0.2 W
Nom. Input Voltage:  2.5 Vrms
Nom. drawn current: 80 mA rms
Max. S.P.L. 124  dB
Impedance: 32 Ω
Efficiency: 100 dB/1mW  (115 dB/1V)
Weight: 380 g.
Clamping force: Low/medium
Accessories: 1.2m audio cable with remote control, USB-A to USB-C cable for charging only. A very nice hard case.

 

Sound description:

Will be added later on

measurements:

The measurements below is from the Amiron Wireless in wired mode (so using the supplied 3.5mm audiocable)

Below the frequency response of the Amiron Wireless (Left, Right)

FR Amiron WL

 

The Amiron Wireless has a similar ‘warm’ tonal balance with emphasized bass and a small treble peak on top of it. The sound is ‘soft’ and pleasant. It doesn’t have the typical ‘Beyer treble’ peak but treble is still elevated a bit.
When using it in BT mode using the supplied app the tonal balance can be changed completely.

A comparison with the Amiron Home seems logical as both share the same name, looks (more or less) and price range.
Below the frequency responses of the Amiron Home versus the Amiron Wireless.

 

Amiron vs Amiron WL

These do not sound similar despire the name and looks suggesting it. The Wireless version has more subbass and a higher bass level. Where the Amiron home has a warm tilt between 200Hz and 1 kHz the Wireless version is linear in that range.
More neutral in the mids with a heftier bass thus.
In clarity/presence these headphones differ a bit. Where the clarity/presence (2-4kHz range) is very good in the Home version the Wireless version is more ‘relaxed/laid-back’ and thus has somewhat less clarity in the mids.
The ‘middle finger’ shaped treble peak which makes the Amiron Home a bit ‘shrill’ and ‘over accentuated’ with poorer recordings is not present in the Amiron Wireless.
There is a small peak which can still give a slight sharp ‘edge’ with some recordings but will not be offensive in most cases.

Seal can be an issue with closed-back headphones. Breaking the seal (improper fit on the head, glasses, hair) usually means a loss of (sub)bass. The Amiron Wireless is not different than most other closed headphones in this aspect.
Perfect seal, with thin armed glasses and with thick armed glasses.

seal Amiron

The tonal balance does change considerably when the fit isn’t perfec. Subbass and bass is affected a lot. When the seal is broken a lot the sound becomes a bit cuppy.
With just a small seal breach (hears, glasses) the boosted bass levels become ‘normal’ bass levels but the great subbass extension is gone.

output resistance / damping-factor

As this is a dynamic headphone the frequency response might be amplifier output resistance dependent when certain higher output resistance amplifiers are used.
To test this the headphone is measured via a low impedance amplifier (0.2Ω) and a high impedance amplifier (120Ω). On a higher output resistance amplifier the output level will be considerably lower. To compensate for this the amplifier is cranked up to the same level (at 1kHz) as the low impedance amplifier. This way the plots are overlay-ed and it is easy to see how the tonal balance changes.

R 120 Amiron WL

 

There is a 2.5dB boost in the lows. (Right channel is measured). This will make it sound very bassy/muddy/fat. Of course this headphone is not designed to be driven from desktop gear, at least not with high output resistance amplifiers).
Driving it from portable equipment with output resistances below 10Ω is not problematic though.

Below the distortion measurements of the Amiron Wireless (Left channel).

Note that this headphone was measured at ears-unlimited-logo where background noises were present in the demo room. As this is an open headphone the distortion levels and spectrum plot performance may be better in reality than shown on the plots due to ambient sounds being measured along with the headphone.

Dist Amiron L

 

Below the distortion plot but displayed in percentages.

Dist Amiron L percent

The 2nd harmonic distortion level (around 1%) in the bass is quite decent.
The actual 2nd harmonic distortion above 200Hz may well be lower than 0.1%.
A shortcoming of my measurement rig.
The 3rd harmonic distortion remains below 0.5% in the bass area and below 0.1% around 5kHz (where a dip in the frequency response is found).
Pretty good distortion profile but at this price point this is the least one can expect.

Below the CSD of the Amiron. (Left and Right are superimposed)

CSD Amiron WL

 

The lower mids linger on a bit longer than desirable. The dip around 5kHz is flanked by 2 short-lived resonances. Above 7kHz the driver performs well. No deal-breaking resonances there.

 

 

Below the spectrum plot of the Amiron Wireless which doesn’t show any alarming issues. Bass appears to linger on a bit longer than desirable perhaps but the result is a bit skewed because the bass is higher in level as well.

 

spectr Amiron WL L

The step response plot below (Left channel) shows theexcellent bass extension and bass boost.

 

Step Amiron WL L

The ringing isn’t very long lived but is a bit longer than desired. The initial rise not reaching 0dB but only -7dB is testimony of the ‘soft’ character and slight lack of ‘clarity’.
The bass oriented sound is shown by the trace topping out around 1.8ms.

summary

All in all this is a comfortable headphone to wear and listen to with its bassy (slightly laid-back) sound. A little bass boost usually is pleasant when using it on the go.
When using it with BlueTooth connection the game changes of course.
A possible downside is the ease with which the headphone flies of the head when moving around a bit less cautious.
An expensive Bluetooth headphone but perhaps one of the nicest if not the nicest wireless headphone around.

post separation

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