Amiron

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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

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Beyerdynamic Amiron

Amiron

The Beyerdynamic Amiron is an open over-ear (circumaural) dynamic headphone which has a Tesla-driver just like the DT 1770 Pro and DT 1990 Pro. The DT 1770 sounds close to the DT 770 which is a much cheaper plastic version with a ‘lesser’ driver.
The DT 1990 sounds close to the DT 990 as well. The Amiron, however, is not the tonal balance equivalent of the DT 880 so is not a DT 1880.

This headphone is not intended for portable usage as the impedance is a bit too high to be driven from phones/tablets and small DAP’s. It is intended for home usage. The driver appears to be the same one that is used in the DT 1770 and DT 1990 and is 250Ω. With an MSRP of around € 600.- it isn’t one of the cheapest headphones around.
The pads are made of a different material than the common (p)leather and velours pads and feels quite comfortable. They are a bit stiff though.

specifications:

Type: Over ear, open
Usage: Home.
Driver type: dynamic (Tesla)
Pads: micro-fibre
Foldable: No
Headphone connector: 3.5 mm TRS
Cable entry: dual
Cable: 3m with gold plated 3.5 mm TRS plug and 6.3 mm adapter
Driver size: 45 mm
Nom. power rating: 0.2 W
Max. S.P.L.  125 dB
Impedance: 250 Ω
Efficiency: 102 dB / 1mW / 500Hz (108dB/1V)
Weight: 340 g.
Clamping force: Low/medium
Accessories: screw-on 6.3mm adapter

Sound description:

Will be added later on

measurements:

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

FR Amiron

In tonal balance it is somewhat similar to the old DT 990-600 (shown below).

The Amiron also has a similar ‘warm’ tonal balance with a lot of treble on top of it. One could also say it has recessed mids.
Both have a rather high treble peak at around 8kHz which seems typical for these type of Beyerdynamic headphones. It gives the impression of being highly detailed. Those who have heard ‘tonally correct’ amounts of treble realize that it is ‘fake’ detail after a while.

Below the frequency responses of the Amiron, DT1770 and DT1990.

FR 3x Beyer

The treble peak (and small dip at 4.5kHz) are the same. The DT 1990 has somewhat more upper treble extension giving it slightly more ‘air’ to the sound.
The Amiron is warmer and bassier than the DT 1990. The DT 1770 is a bit more ‘impressive’ in the lows and sub-lows. What is obvious here is that the drivers in these headphones are probably the same and only the tuning below 2kHz differs.

Below the distortion measurements of the Amiron (Right 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

The 2nd harmonic distortion level (around 2%) in the bass isn’t the greatest around but in the lows this isn’t heard as ‘distortion’. The distortion around 4.5kHz (2%) and around 8kHz (1%) are less benign. At this price-point perhaps one would expect lower distortion levels though. The DT 1770 and DT 1990 measure better so quite possibly the actual distortion is lower and the distortion spikes may well have been ambient sounds from the demo room it was measured in. Don’t take these specific distortion plots too seriously.
Below the distortion plot but displayed in percentages.
Dist Amiron L percent

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

CSD Amiron

The dip at around 4.5kHz appears to be a resonance in disguise. The higher frequencies, even though too high in amplitude) do not appear to have long lasting resonances.

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.

120Ohm Amiron

There is ‘only’ a 2dB boost in the lows. (Right channel is measured). Strangely enough the subbass is lower. Could be a measurement error ?

The CSD below shows the mids also aren’t affected much by the higher output resistance. The driver remains well behaved in the mids. From (0.2Ω) and (120Ω) amplifier .

CSD Amiron 120

Below the spectrum plot of the Amiron which doesn’t show any alarming issues.

Spectr Amiron L

The step response plot below shows a decent bass extension and a mild midbass boost. The ringing isn’t very long lived and damped quickly. It is a bit big in initial amplitude.

Step Amiron R

summary

All in all this is a ‘pleasant’ headphone to wear and listen to with a warm (slightly laid-back) sound. That is if you aren’t bothered by the (Beyer) treble peak that seems to be obligatory in these Beyer headphones. 1 or 2 plies of toilet paper in front of the driver can help somewhat to reduce this issue.
This is a slightly warmer and bassier alternative to the DT 1990

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