DT 1770 Pro

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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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Beyerdynamic DT 1770 Pro

DT1770Pro

The Beyerdynamic DT 1770 Pro is a closed over-ear (circumaural) headphone with a Tesla-driver just like the Amiron and DT 1990 Pro. The DT 1770 has a similar tonal character as the DT 770 which is a much cheaper plastic version with a ‘lesser’ driver.
This headphone is not intended for portable usage as the impedance is a bit too high to be driven from phones/tablets and small DAP’s. It is intended for home and studio usage. The driver appears to be the same one that is used in the Amiron and DT 1990 and is 250Ω. With an MSRP of around € 600.- it isn’t one of the cheapest headphones around.
When looking around it can be found for prices between € 500.- and € 600.-
The pads on this model (when measured) were velours ones as these are fitted as a standard. The DT 1770 Pro come with pleather pads in the box.
Possibly the pleather pads could be slightly more bassy, didn’t measure them.
As usual this Beyerdynamic headphone too is very comfortable.

specifications:

Type: Over ear, closed
Usage: Home, studio
Driver type: dynamic (Tesla)
Pads: replaceable, velours pads are fitted, pleather (fake leather) in the box.
Foldable: No
Headphone connector: mini XLR
Cable entry: single sided (left)
Cable: 3m with gold plated 3.5 mm TRS plug and 6.3 mm adapter
and a 5m (when fully stretched) coiled cable.
Driver size: 45 mm
Nom. power rating: 0.2 W
Max. S.P.L.  125 dB
Impedance: 250 Ω
Efficiency: 102 dB / 1mW / 500Hz (108dB/1V)
Weight: 388 g.
Clamping force: medium
Accessories: hard storage box, 6.3mm adapter, pleather pads

Sound description:

Will be added later on

measurements:

Below the frequency response of the DT 1770 fitted with velours pads (Left, Right)FR DT1770

The DT1770 has a big bass and good bass extension. The small ‘dip’ at 250Hz slightly ‘dis-attaches’ the bass from the mids. The mids themselves are good but VERY slight warm/laid-back and could do with a hint more clarity/presence. The treble is the typical ‘Beyer treble’ which means ‘overly detailed/sharpish’ but slightly better in quality than the (MUCH cheaper) DT 770. Treble extension is good.

 

In tonal balance the DT 1770 Pro is somewhat similar to the DT 770 Pro (shown below).

FR DT1770 vs DT770Pro

 

As the DT 1770 shares the same driver with the Amiron and DT 1990 a direct comparison is logical. I suspect the tonal balance differences between these different original Beyer pads may not be very big. Below the frequency responses of the DT 1770DT 1990 and Amiron.

FR 3x Beyer

The treble peak (and small dip at 4.5kHz) are the same. The DT1990 has somewhat more upper treble extension giving it slightly more ‘air’ to the sound.
The Amiron is warmer and bassier than the DT 1990. The DT 1770 is a bit more ‘impressive’ in the lows and sub-lows. What is obvious here is that the drivers in these headphones are probably the same and only the tuning below 2kHz differs.

Below the distortion measurements of the DT 1770 (Right channel).
Note that this headphone was measured at ears-unlimited-logo where background noises were present in the demo room. As this is a closed headphone the distortion levels and spectrum plot performance may thus be slightly better in reality than shown on the plots due to ambient sounds being measured along with the headphone.

Dist DT1770 R

The 2nd harmonic distortion level (below 1%) in the bass is very low. The distortion around 8kHz is only 0.2%. The 3rd (and higher) harmonics that are reaching 0.5% around 2kHz are not seen in the DT 1990 and Amiron and thus are most likely ambient noises and may not be there in reality.
Below the distortion plot but displayed in percentages.
Dist DT1770 R percent

Below the CSD of the DT 1770. (Left and Right are superimposed)

CSD DT1770

The dip at around 4.5kHz appears to be a resonance in disguise. The mids are not as well damped as those of the DT 1990. In the treble some short lived resonances are visible.

output resistance / damping-factor

As this is a dynamic headphone the frequency response might be amplifier output resistance dependent when certain higher output resistance amplifiers are used.
To test this the headphone is measured via a low impedance amplifier (0.2Ω) and a high impedance amplifier (120Ω). On a higher output resistance amplifier the output level will be considerably lower. To compensate for this the amplifier is cranked up to the same level (at 1kHz) as the low impedance amplifier. This way the plots are overlay-ed and it is easy to see how the tonal balance changes.FR DT1770 R 120

There is ‘only’ a 1dB boost in the lows. (Right channel is measured). Because the lift is present from the lowest bass notes right to the mids the headphone will sound slightly warmer from a high output resistance amplifier.

The CSD below shows the mids also aren’t affected much by the higher output resistance. The driver remains well behaved in the mids. From (0.2Ω) and (120Ω) amplifier .

CSD DT1770 120

 

Below the spectrum plot of the DT 1770 which doesn’t show any alarming issues.Spectr DT1770 R

 

The step response (Right channel) below shows a good bass extension and a mild bass boost (raised part at around 2.5ms). The (8kHz) ringing is not very well damped but doesn’t ring on that long.  The left channel measures the same so is not shown.Step DT1770 R

 

summary

The Beyerdynamic DT 1770 Pro is basically a mechanically nicer made DT 770 with a slightly higher sound quality. I suspect that in a studio the plastic version may be more durable and stay ‘pretty’ a bit longer. Damaged metal simply doesn’t look as great as worn plastic.
Whether or not the increase in price is worth the difference in sound is up to the owner.
For home usage the metal version certainly looks much nicer and has somewhat better sound.
That is if you aren’t bothered by the typical (Beyer) treble peak. 1 or 2 plies of toilet paper in front of the driver can help somewhat to reduce this issue.
Overall a rather expensive but nicely made closed headphone with emphasized bass and treble.

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