D8000

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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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Final D8000

D8000

The Final D8000 is a semi-open planar magnetic headphone.  It has a bulky and old style design. Those knowing about the brand Final will know there is quite a cult following this brand which is known for life-stile headphones and earphones.
Final (former Final Audio Design) is not known for accurate sound but rather for having sound signatures that one may like or not like.

The D8000 is a planar headphone but is not the same as the usual planar suspects in that the driver damping is quite different. The driver is damped a lot more than other planar designs. For more info look for: AFDS (Air Film Damping System)

The 3m cable is quite heavy and microphonic alas. You can hear the cable rub against clothes etc. Haven’t tried the shorter and thinner cable.
The headband is soft but and has a small contact surface area which takes away some of the comfort as the headphone is quite heavy (523 gram, I reckon without the heavy cable).
The pads are unlike those one usually finds. They have a large outer diameter and relatively small inner diameter (54 mm) so the contact surface with the skin is large.
This distributes the clamping force.
The material used is also quite different. The foam inside appears to be regular foam and is quite stiff. Over this foam there is soft cloth which feels a bit silky and is a bit loosely ‘draped’ over the pads. Quite comfortable when wearing it.

The cups aren’t fully closed and also not fully open like most planar designs. There are closed planar designs as well. This one sits inbetween. Not fully closed and not fully open. Some attenuation from outside noises is present as well as sound leakage to the outside world. I would say it is semi-open when it concerns sound leakage.

specifications:

Type: over ear, semi-open
Usage: office and home.
Driver type: planar with Air Film Damping System.
Pads: silky cloth covered foam pads, replaceable
Foldable: No
Headphone cup connector: 3.5mm TS (mono) locking
Cable entry: dual
Cable: 1.5m with 3.5mm TRS jack and 3m with 6.3mm TRS Jack plug
Driver size: 50mm
Max. power rating: not specified, (assumed at least 1W)
Max. voltage: 8 Vrms (assumed)
Max. current: 130 mA (assumed)
Max. S.P.L. 128dB (assumed)
Impedance: 60Ω
Efficiency: 98dB/mW (110dB/V)
Weight: 523 g. (without cable)
Clamping force: medium.
Accessories: 1.5m cable, 3m cable and a headphone stand

Sound description:

The D8000 has a full bodied sound with a very nice ‘warmth’ to it. Not an exessive warmth. This may be the most ‘neutral’ headphone in the Final stable as most Final headphones have specific sound signatures rather than striving for a neutral balance.
Bass extension is good and subbass is there. Mids have a good tonal balance. Just a very slight warmth to it. Very pleasant non fatiguing mids. The dip at 3kHz is audible as a slightly ‘laid back’ sound and somewhat lacking ‘attack’ with some instruments. That dip is seen on many headphones and when the drivers are angled the dip is ‘less’ because of so called ‘Concha gain’. These drivers are not angled so the dip is there.
The advantage of such as dip is that music does not become ‘harsh’ or ‘shrill’ so lesser recordings sound ‘better’ and better recordings sound ‘laid back’ as if further removed from the stage when visiting live performances.
The treble is soft in character and feels slightly ‘reduced’ in level but still is present enough. Even though it starts to roll off above 16kHz it does still have enough ‘air’.
The treble is never harsh or sibilant and stays pleasant in tone and character but is lacking the ‘presence’ and ‘fragile/ethereal’ sounds most flagship headphones show.
Not the ‘typical’ planar sound as found in mr.Speakers and HIFIMAN headphones nor with dynamic flagships but closer to sound signatures found in the mid-fi headphones but then with superior characteristics.
Aside from the stereo/soundstage/headstage/imaging (sound between the ears and not in front of you) the overall sound is closer to that of good speakers than most flagship headphones are.
You can listen to these for hours on end (assuming the weight is no bother) without experiencing any fatigue, which IMO is an important sonic ‘attribute’.

Measurements:

Below the frequency response of the D8000 (Left, Right)FR D8000Channel matching is excellent, as it should be for a headphone in the $4k price range.
Bass extension is good. Bass quality is excellent with seemless intergration to the mids.
Not a basshead headphone but sounds full bodied yet realistic with almost all recordings.
Mids are slightly warmish (very gradual sloping from 200Hz to 1.5kHz but the dip around 3kHz is audible which is responsible for the reduced ‘attack’ but also reduced ‘harshness’ in poorer quality recordings. So a good thing for a lot of recordings but less positive for better recordings though not a deal breaker for sure. It is very easy to not hear the dip (brain adjusts easily).
The treble is present and while a slight emphasis is measured from 7kHz to 10kHz it doesn’t sound elevated at all. In fact treble sounds slightly subdued. Perhaps because the quality of the treble is good.

Seal

Final claims to have solved seal issues with their driver. Below the D8000 with a proper seal and with the seal breached.seal loss
As can be seen there are absolutely no seal issues. No problem wearing thick armed glasses or when hairs are trapped between the pads. Bass quality/extension doe not suffer or chjange at all. Impressive.

output resistance / damping-factor

As this is a well damped planar headphone the frequency response does not  change when used with a higher output resistance (desktop) amplifier.
No problems using it from desktop nor portable equipment.

Below the distortion plots of the D8000: (only Right channel shown)
The distortion products are shown in dB.Dist D8000 R

Distortion is quite low but not exceptionally low. Not much to worry about here as most distortion products are 50dB below the signal .

Note that this headphone was measured at ears-unlimited-logo where unavoidable background noises were present in the demo room. Distortion levels and spectrum plot performance may thus be better in reality than shown on the plots.

Below the same plot except shown in percentages.
Dist D8000 R percent
It shows the bass distortion level is quite good and remains below 1%. The peaks around 500Hz and 3kHz may not be there and are most likely caused by ambient sounds during the test in less than ideal conditions.
The 2nd harmonic distortion is most likely below the 0.2% shown in the plots. This is due to the limits of the measurement rig which are being reached.

Below the CSD of the D8000 (Left and Right channel are superimposed)
CSD D8000The CSD is quite typical for planar headphones with large diameter drivers. Above 3kHz the driver seems to be well damped for a planar headphone and no long resonances are seen that might affect the sound quality in a clearly audible way.

Below the spectrum plot of the D8000. (left channel)Spectr D8000 LThis plot shows bass is pretty well damped and does not linger nor ‘muddy’. This plot looks pretty good and shows the driver doesn’t keep on vibrating on specific frequencies at audible loud levels. The blue signals above 500Hz most likely are ambient sounds being picked up under the test conditions.

By lack of oscilloscope shots (not enough time to measure that) below a step response plot of the D8000. (Right channel)step D8000 RThe initial rise almost reaches the 0dB level. Ringing is short lived. Aside from the dip (the 18kHz dip) at the beginning the horizontal line remains horizontal till 1.5ms and gradually slopes downwards showing good subbass response.
The plot below (HIFIMAN Ananda)  shows a ‘bump’ around 0.4ms which means there is an audible emphasis around 2.5kHz which is not seen on the frequency plots, in fact it even shows a dip there. It does account for the ‘clear’ sound it has.step Ananda LThe D8000 is pretty ‘flat’ in that region indicating a tonal response that is not emphasizing any parts in the frequency range.

summary

The Final D8000 is a very expensive headphone and thus out of reach for most people.
There are more expensive heaphones  around in this price range from Hifiman, Audeze, Focal, Stax, Sanoma etc. so there is some choice here as well.
One would expect all those flagship headphone to perform equally well and sound closely the same as they are closer to ‘perfection’. Well … they don’t. All of them have some excellent properties but also downsides.
When one can live with a somewhat heavy weight (0.5 kilo) and the heavy microphonic cable, which one can replace for aftermarkt cables, and prefer a full bodied non fatiguing sound over hyper details and ‘airy/ethereal’ sound then this headphone when money is not an object and looks aren’t that important (they are rather bulky and different from other flagship designs).
The sound approximates that of live performances and well made speakers in a well damped room quite well and is a pleasant listen for longer listening sessions.
While it does have some nice properties it is not perfect either. Some qualities that ‘sound quality lovers’ crave for such as ultimate clarity/presence and well extended treble and hyper dynamics or ‘wide’ soundstages it is not doing that great.
Musicality is there though which some of the higher end offerings do less well.

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