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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.
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.

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Ausdom ANC7


The Ausdom ANC7 is a medium priced (around $ 130.-) Bluetooth headphone with Noise Cancelling circuit.
It appears to be well made and has a luxurious appearance with tastefully done red accents.
The bluetooth part works well. It can also be connected to a normal headphone jack (3.5mm TRRS) via a thin cable that comes with it. The tests below are all made using this cable.
When the bluetooth part isn’t used or the battery is empty the headphone can still be used with the 3.5mm TRRS jack which is a good feature. That is, as long as the batteries aren’t depleted.

First impressions of this headphone with the Noise Cancelling switched off aren’t very favourable when compared with a ‘normal’ headphone in this price class. It has very little bass/warmth and is very ‘cuppy’ (hollow) sounding. As if sounds are played through a large bucket or pipe.
Treble quality is ‘soft’ but on a good level with no harshness, nasty peaks nor sibilance.
The level of detail can just barely be called decent.

The overall sound is not very dynamic, a bit too ‘polite’ and ‘compressed’ sounding compared to better headphones. Less sound quality than the Ausdom M05 (once modified) which is discussed further below.

When the Noise Cancelling is switched on the sound changes substantially. The bass now has the correct level. The sound signature becomes ‘darker’ and the amount of treble is reduced a bit more.
The overall SQ improves AND degrades at the same time, depending on what aspects one is looking at.
Tonal balance (bass) is much better but the amount of treble is reduced which is a shame because it lowers the overall clarity as well. At lower listening levels the tonal balance seems slightly better due to the way our hearing works (google Fletcher-Munson). But the background noise becomes audible in quiet passages which is more audible at lower listening levels. It’s not an annoying ‘sharp’ hiss though.

A more thorough description and measurements is found HERE

Below the frequency response of the ANC7 with the Noise Cancelling turned off. (Left, Right)

FR ANC7 off

The peak around 300Hz causes the ‘cuppy/honky/hollow’ sound. The bass roll-off is obvious. From 2kHz to 20kHz the response is quite good. No sibilance or nasty peaks.

Below the frequency response of the ANC7 with the Noise Cancelling turned on. (Left, Right)

FR ANC7 on

Hello Bass ! Due to the noise cancelling circuit the bass reproduction now is deep and tonally correct. The large peak at 300Hz has been replaced with a smaller peak higher up.
This is because the noise cancelling stops at around 600Hz. The treble is relatively lower in amplitude and thus the overall sound signature can be called ‘dark’ with somewhat subdued and soft treble.

Below the distortion plots of this headphone with NC off


Distortion levels of the lower frequencies are a bit on the high side (2% of 3rd harmonic)
Second harmonic distortion stays rather high over the entire audible range.

Below the distortion plots of this headphone with NC on


The 3rd harmonic distortion below 200Hz is reduced because of the Noise cancelling circuit. The Second harmonic distortion still stays rather high over the entire audible range. Above 500Hz the higher harmonics distortion has increased a lot. I suspect the amplifier circuitery may be to blame.

Below the CSD of the ANC7 with NC off. (Left and Right superimposed)

CSD ANC7 off

Above 2 kHz there aren’t many problematic resonances present.

Below the CSD of the ANC7 with NC on. (Left and Right superimposed)


The peak around 700Hz becomes quite obvious in this plot.

Below the Spectral Decay plots from 100Hz to 30kHz on a longer scale (50ms vs 5ms for the CSD). This plot is made with NC off.


Below the Spectral Decay plot with NC on.


The 600-700Hz peak also is clearly visible in this plot.

Below the squarewave and impulse response plots woth NC off on the left side and with NC on on the right side.

SQR stock

The improvement in the lower frequency range is obvious. With NC on the squarewave response is almost perfect. With NC off the roll-off is quite obvious.
The 440 Hz squarewave doesn’t look like a squarewave at all, both with NC off and on.
The impulse response plot with NC off shows a weird ‘bounce’ after the impulse. With NC off the amplitude is slightly lower and the right side of the impuls becomes very ‘slow’.

Just like the M05 (as well as other headphones) this headphone can be improved both meaurably and sonically with some effort.
How to modify this headphone is described HERE.

The improvements in frequency response with NC off are shown below. This plot is of the right channel only. (stock, modified)

FR ANC7 stock versus modified R off

The frequency response has become flatter and the cuppy sound is greatly reduced.
Bass levels haven’t changed nor has the treble response.

Below the improvements in frequency response with NC on. This plot is of the right channel only. (stock, modified)

FR ANC7 stock versus modified R on

A much better linearity but still with relatively subdued treble. The 700Hz peak is greatly reduced.

What do I think of the ANC7 ?

With Noise Cancelling off the stock headphone sounds bass-less and ‘cuppy’.
When modified it just sounds bass-less, midrangy and trebly with a mediocre sound quality. Certainly not hi-fi. More complicated music sounds very ‘messy’ and lacks definition. For better recorded material and less complex music the sound quality isn’t that bad when you listen to it exclusively and do not compare it directly to better headphones. No sibilance but also no highly detailed sound. Doesn’t sound rolled-off.

With Noise Cancelling turned on you get a good bass level/quality and a much improved tonal balance with subdued and ‘soft’ treble. It doesn’t sound very dynamic though. It has a ‘compressed’ and somewhat ‘dark’ character. It can be described as ‘polite’ sounding, nothing offensive in the sound.
It lacks ‘sparkle’ and small details are not highlighted, they are not really lacking but very subdued.
Modifications bring some further improvements.

The Noise Cancelling feature itself isn’t as effective as on most other N.C. headphones I tested/heard/ measured. Also there is an audible noise in soft passages. It’s not a sharp his but definitely audible.

The Bluetooth part works well. It has quite some reach and the sound quality isn’t much less than used wired. But one must realise this doesn’t become a ‘resolving’ headphone on TRRS either.

For about double the money there are better sounding headphones available.

The looks and finish as well as comfort is good though. It’s the sound quality (drivers) that are a bit disappointing when looking at it from a hi-fi point of view. For audiophiles it is safe to say it is best to avoid this headphone.

That said, there aren’t that many decent built headphones around with (some) Noise Cancelling and Bluetooth properties in this price-class. When you don’t play music loud and prefer a ‘laid back’ and ‘warm’ sound signature this headphone doesn’t do much wrong. Distortion products (harmonics) in that case are below the audible limit. When a low level hiss in-between songs or during quiet passages is no biggy then the ANC7 is enjoyable when high levels of outside noise attenuation aren’t needed.

When the small modifications are applied this headphone doesn’t suddenly become a MUCH better headphone but it does improve and the modifications are worth the effort to me.

It remains an ‘overly polite’ and ‘warm’ headphone without sounding ‘airy’ nor ‘detailed’. It lacks ‘dynamic’ sound and when played louder doesn’t sound as ‘nice’ any more as it does at lower listening levels.

This headphone can be worn for long periods of time without discomfort both for the ears and head.
This is important when these headphones are used for longer periods of time when travelling for instance. This is where these headphones do not disappoint.

The sound is ‘polite’. As long as you don’t play it very loud and have Noise Cancelling on it is an enjoyable headphone but not in a true ‘hi-fi sense’. Detail whores will be disappointed.

Once charged you can keep them playing all day and evening and it will keep on playing even after that. 1-3 hours charging time will give about 18 hours of listening pleasure. When BT isn’t used that may be even longer.

Alas when the batteries are depleted it can’t still be used ‘passively’ Using TRRS cable and switched ‘off’) so it can totally ‘die’ on you once the batteries are low.

Not very suited for people with bigger than average heads or ears. Good enough for listening casually while travelling.

It comes with a nice carrying bag as well.


Not the best headphone out there for the street price but when BT and NC functionality is taken into the equasion it isn’t too expensive for what it offers.

Comfortable headphone with a ‘polite’ and decent enough sound quality for travel with NC on.
Not recommended for people that love detailed sound nor for people with larger sized ears.
It needs charged batteries to function, even when bluetooth and/or Noise Cancelling are switched off.

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