ÆON Closed

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Published: Nov-2-2017

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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.


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MrSpeakers ÆON Flow Closed

AEON flow closed

The MrSpeakers ÆON Flow closed is a closed orthodynamic over-ear headphone intended to be driven directly from portable and desktop equipment.
There is also an open version available for the same price.
It retails for around € 800.- which is not really cheap but also still under the magical  € 1000.- barrier.
For this you do get a modern looking (and great sounding) lightweight and comfortable headphone. The headband may look flimsy but actually it is not.
The earpads are just large enough to fit most ears comfortably.
Pad rolling is not an option here as thepleather pads are glued. When the pads need to be replaced MrSpeakers can provide new pads which can be stuck on the headphone once the old pads have been removed.
The isolation from outside noises is quite good. Others also cannot hear what you are playing. Perfectly suited for portable usage.
The low impedance also suggests it is designed with portable usage in mind. The impedance being 13Ω  is a bit on the low side. Not all portable and or desktop amps may be fully capable of driving this headphone to louder levels.
The DUMMER cable is somewhat on the stiff side and a bit microphonic.
When ordering one can choose between 3.5mm TRS (+ 6.3mm converter) or a balanced 4-pin XLR connector.

It has been succeeded by the Dan Clarck (Mr. Speakers had a name change) ÆON flow RT (Re-Tuned) closed which is even cheaper (around € 500.-) and has a bit more bass. Tuned closer to Harman.


Type: Over ear, closed
Usage: Home and portable
Driver type: orthodynamic
Pads: pleather, glued
Inner pad dimensions: Height 85mm, Width 45mm (at widest point), Depth 25mm
Collapsible: No
Headphone connector: Hirose connector
Cable entry: double sided
Cable: replaceable,  2m with gold plated 3.5 mm TRS plug or 4-pin XLR
Driver size: 35mm x 50mm
Nom. power rating: unknown (assumed 2W)
Max. voltage: 5.1V (assumed 2W)
Max. current: 400mA (0.4A) (assumed 2W)
Max. S.P.L.  126dB (assumed 2W)
Impedance: 13 Ω
Efficiency: 78 dB/1mW  (97dB/1V)
Weight: 340 g.
Clamping force: low/medium
Accessories: DUMMER cable,  clamshell travel case, screw on 6.3mm TRS converter

Sound description:

The ÆON closed sounds surprisingly ‘open’. The tonal balance is excellent as in very realistic.
Bass is very well extended and not emphasized at all. I would call it tight and realistic.
Much better than the ÆON open and even the more expensive ETHER versions.
Integration between bass and mids is excellent. You can hear each bass note from the lowest to the highest on the correct level.
Mids are very forward, clear and open and sound ‘dynamic’. Mids are slightly lacking in clarity when compared to headphones like the HD6x0. Not in an annoying way though.
It is better to have a dip in the upper mids/lower treble than a peak.
This makes the mids sound clear and ‘laid back’ at the same time. As if being slightly further in the concert hall.
Treble is ever so slightly emphasized with some recordings but spot-on with better recordings.  Treble is smooth and sounds well extended.
All in all a full and balanced sound with a high quality and amount of ‘realism’.
Perfectly suited for portable usage as well as on a home system.
It does not reach HD800 quality in some technical areas but certainly is very capable.


Below the frequency response of the ÆON closed (Left, Right)FR Aeon closed

The frequency response shows a neutral tonal response till 1.5kHz. Bass as well as sub-bas is there and of high quality.
The actual measurement is perfectly flat from 10Hz to 1kHz. It would thus appear as though the bass area is reduced but this is caused by the compensation used.
A horizontal line shows a perceived ‘flat’ response, not a measured flat response.

While the mids are quite neutral it does (very slightly) lack some ultimate ‘clarity/presence’.  The dip around 2kHz is responsible for this. That dip is smaller in reality than it measures because the so-called Concha-gain will make this measured dip smaller than it looks. It is still there though, just not audibly as deep as the plots suggest.
A dip in this part of the frequency range is more desirable than a peak though.
The treble does sound detailed and ‘smooth’ and is not lacking ‘air’ and certainly does not sound rolled-off or limited. Treble extension is only up to 18kHz and drops of quickly above 20kHz. Pointless to play files with ultrasonic content on this headphone which can save you quite some space on your portable player. Don’t worry too much about this though… hires will still sound just as hires.
The channel balance is excellent. The tonal balance is ‘flat’ as in neutral/realistic sound.

There is also an open version of this headphone. It has a quite different sound (sonic character) though but some similarities are also observed.
Below the ÆON closed versus the ÆON open (1-notch insert)open vs closed

Below the distortion measurements of the ÆON closed (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 thus be better in reality than as shown on the plots due to ambient sounds being measured along with the headphone.Dist Aeon R

Ignore the spikes at 50Hz, this is mains hum present in the portable measurement set-up. These spikes are NOT there in reality.
The distortion levels are very low. Below 0.3% in the lows is really excellent.
The 2nd harmonic distortion is most likely lower than the 0.2% shown in the plots. This is due to the limit of the measurement rig which is being reached

Below the distortion plot but displayed in percentages.Dist Aeon R percent

Below the CSD of the ÆON closed. (Left and Right are superimposed)CSD Aeon closed

At 6kHz there is a small resonance. This short lived ringing isn’t problematic at all.  For an orthodynamic headphone this CSD looks pretty good.

output resistance / damping-factor

As this is an orthodynamic headphone its impedance is as good as ruler flat so a higher output resistance amplifier will have no consequences for the frequency response/tonal balance/damping. So… no plots as it would only show one green line.

Below the spectrum plot of the ÆON closed.spectr Aeon closed L

This looks really good.. except for the resonance/lingering just above 1kHz. In the CSD this isn’t visible that well but here the 1kHz ringing is shown pretty well.

The step response of the ÆON closed (Left channel) below.step Aeon L

(Sub)bass extension is excellent. The horizontal line stays horizontal.
The higher frequency resonances directly after the initial rise are short lived and low in amplitude.  Quite well damped. Impulse response is at the proper level and shows excellent qualities with a only a mild emphasis in the treble. There is only a small emphasis in the 200μs to 300μs region (3kHz to 5kHz) which gives it a clearer character than one might assume based on FR only.
The ÆON closed thus sounds clear , articulated and smooth. You can still see some medium frequency wiggles in a low amplitude on the horizontal trace which shows the lingering discussed above around 1kHz.


Fit and finish, comfort, weight (for an ortho) are excellent. Especially for the price.
The ÆON closed looks really nice and has a futuristic exterior.
The sound signature is ‘clean’ and ‘realistic’. Bass extends really deep and integrates nicely with the rest of the sound. Treble is smooth, realistic and present. Not splashy nor sibilant at all and very detailed.
The sound of the ÆON closed is surprisingly ‘open’ where, strangely enough, the sound of the ÆON open sounds like a ‘closed’ headphone.
The closed version is much better (as in realistic) sounding than the open version.

An excellent sounding closed headphone.
Yes, € 800.- is quite a lot of money but think you are going to have to fork out a lot more money to get similar comfort, sound quality and comfort.
Finding a good sounding closed headphone with a high wearing comfort is difficult.
This headphone fits that bill.
Very highly recommended.

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