DT 900 PRO X


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published: Nov-1-2021, updated: Apr-16-2022

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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.
descriptors2kl

 post separation
Beyerdynamic DT 900 PRO X
DT900X kl

The Beyerdynamic DT 900 Pro X is an open over-ear headphone. When this headphone came out (Sept 2021) the MSRP was € 249.-
Different construction, different driver, different pads with different mounting construction compared to the DT990 and DT1990. The cup design looks like it is a cheaper alternative to the DT1990.
There is also a closed version, the DT 700 Pro X.

It comes with a soft carrying pouch and 2 straight cables. One is 1.8m the other one 3m. Both have a 3.5mm plug with screw-on 6.3mm adapter.
This headphone cannot be used on headphone amps with balanced out.

The cable is slightly microphonic so in quiet passages and silences the cable rubbing against clothes is barely audible in the left cup. A 3-pin mini XLR cable is used. The same one as used on the DT1770 and DT1990. Inside there is a ‘solderless’ connection so it won’t be easy to mount a 4-pin mini XLR for those wanting to use it balanced.
The soft part of the headband is easily replaceable and has soft rubbery feeling padding.
The headband can extend 40mm and is notched so after adjusting stays in place.
The cups can swivel and tilt just far enough to get a good seal on most (but probably not all) head sizes. Also he headband itself is quite flexible so this headphone will fit on most head sizes. Clamping force is rather high out of the box (5.3N) and so is its weight of 345 gram (without cable)

The velour pads are easily exchangeable and feel very soft to the touch. The velour itself differs from that used on earlier models. This material is feels softer on the skin. Normal foam is used. Most Beyerdynamic pads have foam that degrades over time. This may also happen to these pads as well. Fortunately these too are replaceable. The mounting method differs from what Beyerdynamic owners are used to. The older type pads won’t fit as these new pads click on using a mounting ring. Furthermore the pads are glued onto that ring so the only easy option is to buy pads specifically designed for the DT 900 Pro X. The pads have a 55mm diameter and a royal 25mm depth.

It is an open headphone so outside noised are not attenuated much and people around you will clearly hear what you are listening to.

With a sensitivity of 114dB/V (efficiency = 100dB/mW) and low impedance (48 Ω measured) the DT900 Pro X can be used directly from a phone and reach high enough levels for listening at loud levels.  

The power rating is unusually low for a PRO headphone. 30mW continuous and 100mW peak power is kind of asking for blown drivers. With normal home usage this isn’t an issue but in studios headphones can be lying on a desk and when the volume is turned up accidentally you might end up with blown drivers.

specifications:

Type: Over ear (circum-aural), open
Usage: Home, studio, portable
Driver type: dynamic
Pads: replaceable, velours
Collapsible: No
Headphone cup connector: 3-pin mini XLR
Cable entry: single sided (left).
Cable: 1.8m + 3m straight in a 3.5mm TRS jack with a 6.3mm adapter
Inner Pad dimensions: depth = 25mm, diameter = 57mm
Driver size: 45mm
Nom. power rating: 0.03W (0.1W peak)
Max. peak voltage: 2.2Vrms (6.2Vpp)
Max. peak current: 46mA
Max. peak S.P.L.: 121 dB
Impedance: 48 Ω (measured)
Efficiency: 103dB @ 1mW
Sensitivity: 117dB @ 1V
Weight: 345 g. (without cable)
Clamping force: high 5.3N
Accessories: 2 cables both with 6.3mm screw-on adapter fitted, soft carrying pouch.

Subjective sound description:

Neutral… but not the boring kind. Subbass is reaching very deep. That doesn’t mean this is a basshead headphone. Bassheads will be sorely disappointed. Bass itself also isn’t elevated like with the DT990 and DT1990-Balanced. Those that desire bass to be slightly less than ‘Harman type’ bass will like this headphone as bass is also at the correct (thus not too elevated) level.
Mids are clear and dynamic. The treble is not your typical ‘mount Beyer’ type. Those bothered by the familiar treble peak will be relieved when listening to this headphone when it comes to the amount of treble. When nitpicking… the treble quality is not super refined but still quite good and maybe just a tiny bit elevated resulting in good detail and air but no sibilance/harshness. Treble is just slightly ‘coarse/grainy’ compared to DT990 and DT1990 (at least when these headphones have the treble peak removed) but not in a sound degrading way.
All in all a good and realistic sounding headphone with great comfort.

Measurements:

Below the frequency response of the DT 900 PRO X (Left, Right)FR DT900X
The channel matching is decent. Bass extension is excellent 20Hz = 0dB ! The area between 50Hz and 500Hz is slightly elevated which makes the lower mids sound slightly ‘thicker’ than when the response would be flat in this area.
One of the things that stand out is that the plot above looks ‘smoothed’ as there are no small wiggles seen anywhere. Well the plots are NOT smoothed at all. The response really is this smooth.
The narrow 4kHz dip is not that audible to me and there are reasons for that too despite the dip measuring -15dB. The dip is very narrow and is really a time delayed resonance in disguise.
The peak at 11kHz also is not really problematic as the peak is very narrow and most people have a sharp dip there anyway (in the auditory channel).
The rather high dips and peaks above 8kHz are, most likely, responsible for the perceived lack of smoothness in the treble.

comparisons

Below the DT 900 PRO X versus the half as expensive DT990 Pro (250Ω)DT900X vs DT990Pro-250
The DT990 has a higher level of bass and lower mids and thus is warmer/fuller sounding. Treble is 5dB higher in the sibilance/sharpness range (6 to 9kHz). The DT900X thus sounds quite different from the DT990 Pro/250. The DT900X is closer to the DT880 of old. The newer DT880 versions are bassier than the older DT880.

Below the DT 900 PRO X versus the older DT880 (Edition).DT900X vs DT880 EdMaybe the DT 900 PRO X should have been called DT 800 PRO X instead ?
The DT880 is clearly ‘leaner’ in the bass department and sharper/sibilant in the 6 to 9kHz range.
The higher 2-3kHz range makes the DT900X sound a bit more ‘dynamic/lively’.
The DT 900 PRO X thus is more like an improved DT880 than a DT990.

As mentioned above the newer DT880 versions are more bassy/warm than the older DT880 shown above. Below the DT 900 PRO X versus the DT880 Black Special EditionDT900X vs DT880BSE
DT880BSE looks very similar in bass extension but differ substantially in the upper-bass and lower mids, lack clarity and has much sharper treble.

Of course the most obvious comparison would be to the DT1990 as the DT900X is positioned between the DT990(880) and DT1990.
Below the DT 900 PRO X versus the twice as expensive DT1990 with Analytic and Balanced padsDT900X vs DT1990Pro
The DT1990 with A pads is quite similar to the DT900X between 100hz and 5kHz. Below 100Hz the DT900X has 1dB more bass and 2dB more subbass. The biggest difference is in the sibilance/sharpness band. The DT1990 (with both pads) has a LOT more 6-9kHz presence.
However, when that peak has been removed/lowered to normal levels it is easy to see the treble response of the DT1990 is much better above 9kHz.
The bass and lower mids of the Balanced pads is much higher and sounds too muddy.
It should be noted that the DT1990 (with treble reduced) is superior sounding to the DT900X by the discerning listener.
The DT 900 PRO X thus is not a budget DT 1990 but rather a headphone that sounds good without EQ.

Below the DT 900 PRO X versus the much much more expensive T1 mk2 (which has angled drivers)DT900X vs T1mk2
As the driver of the T1mk2 is angled the actual output between 1kHz and 5kHz is higher than what it looks like in the plot. Also is the imaging a bit better in the T1 the T1 still sounds better and has lower distortion as well. The T1mk2 does have a much warmer sound, recessed clarity and sharpness (8kHz peak) so sounds very different.

Another pretty recent and cheaper model is the TYGR 300 R. Below the DT 900 PRO X versus the cheaper TYGR 300 RDT900X vs TYGR
The TYGR has a lot more midbass hump and sounds relatively warmer/bassier. The TYGR has a bit of sibilance (5kHz) which the DT900X doesn’t have. Treble of the TYGR on the other hand is a bit smoother sounding but still a bit elevated. This will help with gaming which is what the TYGR is intended for.

Of course there are also other well known speakers the DT900X can be compared to. The most well known is the Sennheiser HD650 and when looking at newer models the HD560S as well.
Below the DT 900 PRO X versus the HD650

DT900X vs HD650
Bass extension of the DT900X is better than the HD650. Above 3kHz the HD650 is much better in quality though. People looking for a tiny bit less warmth, more subbass and more ‘sparkle’ might prefer the DT900X.

Below the DT 900 PRO X versus the HD560S
DT900X vs HD560S
Bass extension of the DT900X is slightly better but the HD560S is the more neutral one and because it has an angled driver has better directional properties. Both are enjoyable headphones. The mechanical build quality of the DT900X feels more solid though. Comfort on the HD560S is better.

Phase response

Below the phase response of the DT 900 PRO X (Left, Right)
Phase DT900X
Slow phase shifts are not very audible. Sharp changes in a narrow frequency bands may well be audible. The sharp rises at 4.5kHz and above 11kHz may well be audible and also responsible for the perceived lesser sound quality of the treble.

output resistance / damping-factor

As this is a dynamic headphone the frequency response can be amplifier output resistance dependent when certain higher output resistance amplifiers are used.
Instead of showing impedance plots, which are hard to ‘read’ when it comes to assessing the tonal balance change in the real world, the DT 900 PRO X is measured via a
few different resistance outputs (0.2Ω, 10Ω, 32 and 120Ω). On a higher output resistance amplifier the output level will be lower of course due to voltage division. To compensate for this the amplifier is cranked up to the same level (10.9dB for 120Ω at 1kHz in this case). This way the plots are overlaid and it is easier to see how the tonal balance changes. Output resistances between the mentioned resistance values will result in tonal changes between those traces.

R120 DT900X

The tonal balance changes when a higher output resistance amplifier is used. The impedance hump around 80Hz is quite wide and will become audible with output resistances of amplifiers above 20Ω.

seal

Seal can be an issue with closed-back headphones but is usually less of a problem for open headphones. Breaking the seal (improper fit on the head) usually means a loss of (sub)bass. This can be caused by hair or glasses between head and pad or head shape combined with stiffer pads.
Perfect seal, seal broken with thin armed glasses, seal broken by thicker armed glasses.seal

A broken seal has little influence on the tonality of the headphone. Only subbass extension suffers.
When the pads are slightly lifted the ‘body’ of the sound will suffer a bit.

Below the distortion measurements of the DT 900 PRO X (Right channel).
Dist DT900X RThe plot above shows the level differences between the signal (upper trace) and the harmonics. Note that at around 200Hz the SPL is 94dB.
Most people prefer to see percentages instead of level differences so below the exact same plot except ‘normalized’ to the actual signal and level differences given in percentages. Dist DT900X R percent
Distortion levels in the lowest frequencies are mostly 2nd harmonic and already drop below 1% above 70Hz which is quite decent for a 45mm driver. Note the 3rd harmonic distortion is quite low.
The actual 2nd harmonic distortion above 1kHz may well be lower than 0.2% . A shortcoming of my measurement rig.

Linearity

The headphone is measured 5 times. Once at 60dB, 70dB, 80dB, 90dB and 97dB SPL. level compressionWhen the traces are the same shape then there is no compression which is the case here.
This will be more clearly visible when overlaid and amplified in vertical scale (1dB/div) in the plot below.  70dB, 80dB, 90dB and 97dBcompression

Below the CSD (waterfall) plot of the DT 900 PRO X. (Left and Right are overlaid)CSD DT900X
There aren’t many problematic resonances visible. The one around 4kHz is very short lived and not audible as the ear ‘rings’ a bit in this frequency anyway.
Another interesting thing is that the 15dB deep 4.5kHz dip is hiding behind a -10dB level that occurs about 1ms later. The dip is still there but not as deep as the frequency plot shows.

Below the Group Delay plot for the DT 900 PRO X (Left, Right)GD DT900X

There is some pad bounce around 60Hz otherwise no problematic behavior until 4kHz. A resonance (in FR visible as a sharp dip is just delayed a bit, which the group delay plot above also shows.

A different plot is the spectrum plot. This basically is a CSD (Waterfall) plot but viewed from above where the level differences are color coded instead of being in the vertical axis. Also the frequency range of the spectrum plot is wider (from 100Hz instead of 500Hz). The time span is also bigger in the spectrum plots and expired time is shown from below to top where in the CSD the time is shown from rear to front.

Below the spectrum plot of the DT 900 PRO X (Left channel)
Spectr DT900XNo problematic behavior is visible in this plot.

Step response

Below the step response plot which, when the sound is balanced and well extended should show a fast rise to around 0dB, (indicating fast driver response) and then should be slightly sloping downwards indicating bass extension. (Left, Right)step DT900X
Bass extension is very good. The horizontal trace just slowly drops. The initial rise almost reaching 0dB and the ‘ringing’ is low in level and short lived.

pad compression

Over the years the foam in the ear-pads usually degrades. Because of this the tonal balance can change. Below the headphones measured with 5N clamping force (pads are 22mm high), compressed to 17mm (what I expect to happen after some time of usage) and compressed to 11mm. This would be pads that are really worn and the drivers would be touching the pinna.red=22m, green=17mm, purple=11mm pad compression

acoustic-fleece disc

This new Beyerdynamic model, just like the TYGR, T1mk3, T5mk3 and Amiron Wireless all have substantially different anti-dust discs in front of their drivers compared to the foam discs in earlier models that all have substantial treble peaks.
The center part of these fleece discs (over the driver) is thicker and reduces the well known Beyer-treble-peak.
The effect of this material in front of the TYGR is shown in the evaluation of it.
In the TYGR 300 R (below on the left) a different disc is used from the one of of the DT 900 PRO X (on the right).
TYGR disc

Below the effect the fleece disc shown by removing the disc compared to the stock DT900X.stock vs no disc
There is a substantial (5dB) reduction of treble in the sibilance/sharpness area and interestingly enough the narrow dip has shifted a bit lower.

This prompted me to install the TYGR 300 R disc to see what happen compared to the original disc.stock vs TYGR disc
The TYGR disc is lowering the treble region but also lowers the 5kHz region a bit more. These discs clearly are not only different in looks.
The slight lowering of the 6 to 10kHz region is desirable though.

The DT 900 PRO X also has a new driver type which doesn’t have the usual paper covering as seen on the earlier drivers. Below the business end of the DT 900 PRO X.driverThat upper treble range usually can de addressed by covering a driver with a single ply of a 3-ply toilet paper sheet though.
Below an idea how to do this without covering the paper damper around the driver.
modifThe effect is subtle but as it is over a wider range it is still a small improvement.

Below the stock DT 900 PRO X with the toilet paper addition (as shown above) between the fleece disc and the driver.
stock vs TP (L)
We can see a very slight ‘flattening’ below 1kHz and a small reduction in the 6kHz-20kHz region.
The difference is subtle and may not be worth it.
It requires removing the pads (easy) and removing the retaining ring for the fleece disc (harder to do).
Note: when mounting the ring and the pads that there are small slots that allow placement in one specific position only. The rings of the left and right cup are not the same so do this one cup after the other.

conclusion

The Beyerdynamic DT 900 PRO X is a well built open over-ear headphone that can easily be driven even by relatively low powered devices. The pads and headband padding can be replaced and is an official spare part. At € 250.- it isn’t a very expensive nor cheap headphone.

Those loving the typical DT990 Beyerdynamic sound (elevated lows and treble) may find the DT 900 PRO X a bit lean in the lows and maybe lack some of the ‘hyper detail’ while in reality they got used to hyped lows and treble.
The DT 900 PRO X however has a more neutral, forward, open and dynamic sound with a tamer treble.
It certainly does not sound dull or boring.
The DT1990 with Analytic pads is better sounding in the treble (at least with the treble filter).

The DT 900 PRO X can easily be driven from phones and portable players and play quite loud. Not suited for commuting as it is an open version. The DT 700 PRO X would be better suited for that.

This headphone can be used in studios and will work great for monitoring and maybe even mixing.
One thing that one has to take in mind in a studio. The driver is easily blown up due to its low power rating. Accidentally increasing the volume while it is lying around can kill this headphone.

The replaceable cable is handy.
The replaceable pads are quite comfortable and will fit most (but not all ears).
The clamping force is on the high side and wearing it for more than an hour gives me a headache.
Probably fine in a studio but the clamping force is too high for wearing all day or even just a few hours enjoying music.

In short: A quite neutral, dynamic sounding headphone with excellent bass extension with the only (nitpicking level) drawback being the treble quality (not quantity this is almost fine) and high clamping force.

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Comments
  1. john says:

    thank you for the work you put in this!
    looking forward to see the 700 X measurements.

  2. Lucca Paiva says:

    Very nice review and measurements, the plot comparisons are sure welcome, as is the tonality shift on these. Seems like Beyer went off in recognizing the Dt880 middle ground as of late with the 1990 and this one (ignoring the t1 3rd gen fiasco).

    One thing I still wonder is why won’t they address the low end distortion though, following your data it even worsened from the 880s 2%, and you’d expect that it would improve after 20 odd years…

    • Solderdude says:

      The distortion in the lower frequency range for open headphones is difficult to make lower when using a small diameter driver. The active area is around 40mm in diameter.
      Also the 30mW power rating is a confounding factor.
      No idea why Beyerdynamic believes 30mW rated drivers should be used in professional gear.

      The DT1990 (with A pads + treble reduction) and DT900X are definitely a welcome departure from the ‘hyped bass & treble’ arena.
      They still have plenty of bass & treble monsters in their collection though.

  3. Greggles says:

    Would this make good gaming headphones? Currently use the 560s and want that next step I guess

    • Solderdude says:

      I would recommend the HD560S over the DT900X.

      • Greggles says:

        Would you recommend any higher tier headphones for gaming? I like the 560s but want something with more bass/lower mids with the imaging of the 560s

        • Solderdude says:

          I would recommend EQ’ing the bass in that case. Maybe look for some well reviewed gaming headphones. I only review hifi-headphones as I don’t game. My son does and he liked the HD560S and TYGR but strangely enough didn’t care for the K70x series which are often recommended for this (but lack even more lows).
          He found, just like me, that the clamping force is too high and uncomfortable for longer sessions.

  4. walkoO says:

    Hi,

    thank you for this enormous work of measurements and comparison! I think we should not forget that Beyerdynamic presents this Pro X range for content creators and other streamers, they are not direct competitors of the DT1770 / 1990 line.

    If their output is high, it is precisely to allow creators to be able to work directly from a tablet or a PC with video editing software. Personally I like the beyerdynamic brand, I had their entire range at home until T1 gen 2! I have this DT 900 Pro X, I use it with my pc and a Creative AE5+ sound card. The rendering is frankly good, for the only flaw of the clamping it suffices to twist the metal part which supports the cup a little and voila

  5. ghabit says:

    Thanks for your work! Why they are not going to recommended headphones?

  6. remedy8 says:

    Hi,
    firstly I wanna thank You for Your job – it’s priceless. Secondly: how they actually compare to DT1990 Pro (Dekoni/Analytical with filtering)? I know, that they should be “in different league” but as we all know, when it comes to “objective classes” this is much more complicated. So I’m just curious how close they are to each other in case of “resolution”, “imaging” and general performance (I heard so many opposite things about it).

    • Solderdude says:

      The DT1990 is audibly better in quality in the highs to me when the treble is lowered in the DT1990.

      • remedy8tech says:

        Ok, so they are better in highs (that’s understandable). But does that mean the DT 1990 Pro are similar to DT 900 X Pro when it comes to mid and low-end performance? I assume that “imaging” (or just channel balance) on the “premium” model should propably be better, right? Sorry for all this questions, but I don’t have any possibility to listen to them and there is no reliable (unsponsored) comparison review between this two.

        • Solderdude says:

          fairly comparable in the lows when using A pads. DT1990 is slightly ‘tighter’ sounding. To me spatial qualities were quite similar (both not angled drivers).

          In short: DT900X is not a lower priced DT1990-A (with treble peak filtered). When you don’t want to use EQ and get a decent sounding ‘neutral’ headphone with Beyerdynamic comfort and fit (clamping force a bit high) then the DT900X is a good option.

  7. paweliedtka says:

    Thank you Solderdude.
    Ahh, if only Sennheiser 6** series could match the low frequency extension of this Beyer. But the rest of freq response leaves a bit to be desired. Most likely the 900X eats my older DT880-600 for breakfast, and pads seem to be very comfortable.
    From what see this quite an improvement over the other ‘affordable’ Beyers, even better than DT1990s. Let’s just hope Beyer keeps on improving this design. Maybe one day during this decade, with the R&D possible today, one of the manufacturers will come up with really well measuring and sounding headphone that won’t cost arm and legs. This Beyer model certainly got something good going for itself.

  8. Torben says:

    Hello solderdude,

    Maybe you remember that I wrote you an E-Mail a few months ago. By the time I recently bought a DT880 32 Ohm and wondered why it is so hard to drive.

    Since then, I read way more hi-fi stuff and now it seems to me that the DT 900 Pro X was the headphone I truly was looking for. I fell for “false promises” on the Beyerdynamic website which this headphone seems to fulfill better:
    – They said the 880 32 ohm suits phones and laptops
    – They said the 880 has not a strong, but deep bass
    – They said the 880 has at least a some amount of isolation because of its semi-openness

    All these things the 900x seems to do better, so I am wondering if I should “upgrade” and sell my 880s. (The long cable also annoys me more than I expected.) It is also more expensive though, so it should be worth the purchase.

    That said, I am not unhappy with my 880s. I like the comfort, the spacious sound and the sturdy build quality.

    Things I am wondering about:
    – You mention that the clamp force is way higher on the 900. I think I can deal with that as long as my ears completely fit into the pads. On the 880 my ears do touch the pads. Are the inner holes of the 900 pads bigger than in the 880?
    – I already slightly EQd the sub-bass on my 880 for laptop usage (30Hz +2). Can I expect that the bass on the 900x still sounds “better”?
    – Can I expect a similar “spaciousness” on the 900?
    – Is that 4,5k dip really no problem and does it make sense to EQ it slightly? I saw that oratory1990 didnt even try to EQ it and I wonder why. That said, I am not looking for “harman neutrality”.

    Thank you & Best regards

    • Solderdude says:

      The DT900 is a very good (and more expensive) alternative for the DT880. Has a replaceable cable too and is less aggressive in the treble. The DT880 is a bit more ‘airy’ in the treble.

      Clamping force is higher The pads are a bit more ‘roomy’.

      The 4kHz dip is a ‘resonance’ and should not be compensated. It is pointless to try to lift ‘nulls’.

  9. Profound says:

    Thanks for the great review.

    Two question if I may.

    Since the line/headphones output impedance of most PCs are high, is the frequency response and tonal balance will be affected to the point that makes one advises against mixing just connecting it to a laptop’s headphones output i.e with no external audio interface?

    Which one is better for mixing EDM, DT900PROX or HD560s when both calibrated with some software like SoundID Reference or else you’d recommend?

    • Solderdude says:

      Output resistance of headphone outs on PC’s is usually low (a few ohms). True line-out can be higher but is intended to be connected to an amplifier anyway.

      When both are EQ’ed to the same target it is more a matter of comfort.

      • Profound says:

        I’m no audio engineer but I got that info from the measurements of Julian Krause’s video: https://youtu.be/CZOZZclz4gY at 10:40

        So can I rely on the DT900PROX without the need for an audio interface?

        And with both EQ’ed, the bass extension will be the same?

        • Solderdude says:

          The video is about different output powers in different impedances.
          This, of course, also depends on the used model. All headphone outs are designed for headphones (so low output R)

          The DT900X is about 7dB more sensitive so can go louder.

          When EQ’ed to the same target they will sound the same. Without EQ the DT900X will sound a bit warmer and sharper. The HD560 will be more neutral and clearer.

          • Profound says:

            Thanks for your answers!
            One last question. I understand there is a rule of 1/8 to consider when matching headphones impedance with the source output impedance. How far the frequency response will be affected when plugging the DT 900 PRO X 48Ω to an audio interface HP output with impedance of 11Ω – like that of Arturia Minifuse 1 – which is not ≤ 6Ω = 48Ω/8 ?
            Do you advise against that since it doesn’t adhere to that rule?

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