Ether C Flow

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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 Ether Closed flow
Ether Flow Closed


The MrSpeakers Ether Flow closed is a closed orthodynamic over-ear headphone intended to be driven directly from desktop equipment. The low impedance, however, also makes it suitable to drive it directly from portable equipment.
It retails for around € 2000.- which is pretty expensive.
For this you do get a modern looking (carbon fiber) relatively light-weight and very comfortable headphone. The headband may look flimsy but actually it is not.
The isolation from outside noises is quite good. Others also cannot hear what you are playing.
Not all portable equipment may be fully capable of driving this headphone to louder levels.


Type: Over ear, closed
Usage: Home, studio
Driver type: orthodynamic
Pads: replaceable, lamb leather
Collapsible: No
Headphone connector: Hirose connector
Cable entry: double sided
Cable: replaceable,  various options when ordering.
Driver size: unknown
Nom. power rating: unknown (assumed 3W)
Max. voltage: 8.5V (assumed 3W)
Max. current: 370mA (0.37A) (assumed 3W)
Max. S.P.L.  126dB (assumed 3W)
Impedance: 23 Ω
Efficiency: 92 dB/1mW  (108dB/1V)
Weight: 390 g.
Clamping force: low/medium
Accessories: DUM cable,  clamshell travel case

Sound description:

Will be added later..


Below the frequency response of the Ether C flow (Left, Right)FR Ether flow open

The frequency response shows a pretty neutral tonal response till 2kHz. Bass as well as sub-bas is there in the correct amount and is of high quality. The small dip around 170Hz is responsible for a slightly ‘dis-attached’ bass. Some bass notes may be slightly ‘off’ compared to other notes.
The mids are neutral and are forward and ‘open’ despite the headphone being closed.
The treble does sounds 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. No need to worry… hires will still sound hires.
The channel balance is excellent. There is a difference in the left driver at its resonance point though.
The tonal balance is ‘flat’ as in neutral/realistic sound.

Below the distortion measurements of the Ether C flow (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 Ether Fllow R

Please ignore the spikes around 50Hz and 100Hz. These are actually mains hum present in the portable measurement set-up.
The distortion levels are impressively low. Below 0.3% in the lows is really excellent.  The peaks around 150Hz are caused by ambient sounds during the measurement.
The 2nd harmonic distortion is most likely lower than the 0.2% shown in the plots. This is due to the limits of the measurement rig which is being reached.

Below the distortion plot but displayed in percentages.Dist Ether flow open percent R
The rise of higher order harmonics between 100Hz and 500Hz could be caused by ambient sounds during the measurement as background noises were present during the measurements.

Below the CSD of the Ether C flow . (Left and Right are superimposed)CSD Ether Flow R and L

At 7kHz there is a substantial resonance. The strange part is that this is only present in the left channel. The right channel behaves well and is shown below.

CSD Ether Flow R

The CSD of the right channel is surprisingly ‘clean’ above 1.5kHz for an orthodynamic headphone.

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 Ether C flow (Right channel) .Spectr Ether Flow C R

It shows pretty good behavior there is no sound degrading resonance or lingering showing here.

The step response (Right channel) below shows the sub-bass extension is exemplary. The higher frequency resonances directly after the initial rise are very 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. It thus sounds very clear, articulated and smooth.
Step Ether Flow R

Below the step response of the left channel.

Step Ether Flow L

The long 7kHz ringing is clearly visible. Didn’t have time to explore where the differences were coming from alas.


Fit and finish, comfort, weight (for an ortho) and build are excellent but is the least we can expect at this price.
The Ether C flow looks really nice and has a modern exterior.
The sound signature is ‘clean’ and ‘realistic’. Bass extends really deep. Treble is smooth, realistic and present. Not splashy nor sibilant at all and very detailed.

An excellent sounding closed headphone.
A very good alternative for this headphone is the much cheaper ÆON closed.
Build quality and craftsmanship is higher on the Ether of coarse.

Finding a good sounding closed headphone with a high wearing comfort is difficult.
The Ether C doesn’t disappoint here.

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