Tascam

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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.

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Tascam TH02-B

Tascam TH02

The Tascam TH02 is a cheap headphone and feels and sounds like one as well. It has been hyped on a few forums and even though it has some good properties (lows and mids upto 1kHz) it also has a few downsides. The substantial dipfrom 1.5kHz to 6kHz which makes it lack clarity and the ringing above 4kHz make it sound ‘off’ in the departments. Bass extension is excellent down to 10Hz !  Highs extension is also good, there is still energy around 16kHz. Some channel imbalance.
Comfort is quite poor and getting a good seal with the not so supple pads may not be easy.
The cups cannot be adjusted upwards enough to fit properly on my head.

TH02-B

The CSD below (right channel) shows above 3kHz the headphone has problems in the form of ringing at several frequencies, this may be due to cup resonances or driver problems. the ringing around 1kHz are cup resonances.

th02 csd r

As this headphone isn’t very comfortable and has a bad fit and given the fact I had an old Beyerdynamic DT330 lying around I wanted to transplant the TH-02 drivers into the DT330 housing. In order to get it to sound at least decent I used 3mm thick wool-felt in front of the drivers. This felt also raises the Fostex T50RP pads that are used by a few mm. Because it was too bassy I also made a small filter into the cups consisting of a 47 Ohm resistor in parallel to a 2.2uF ceramic multilayer capacitor. This ‘network’ is in series with the driver. Results are shown below:
More info about the modifications can be found HERE

DSCN2639

Below the Frequency plot of this creation

dt330 - t50rp pads + 3mm felt + filter

Much more bass and smoother highs and much increased comfort and fit.
It still hasn’t become a world class headphone…

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