Dear, Mr. Douglas MacIntyre.
Thank you truly for the inquiry of our headphone.
Well, We will answer the question whether a headphone-set can be submitted
to review. Yes we can. Then, the other your questions might be canceled isn’t it?
And next I will explain about H2 and TR2. It is possible to make the 
highest sound in some volume listened when connecting it with standard 
headphone jack of the amplifier for a general speaker in a quiet room. 
However, in many cases, because it is a too good sound even if it is small 
pressure sound, a bigger sound becomes a request. Then, we prepared 
transformer (TAKET-TR2).  But the problem on the handling said that it is 
considerably annoyed to connect the transformer between the amplifier and the 
headphone. And the price of H2+TR2 rising is a problem on the business now. 
Then, we proposed to the amplifier manufacturer to install the headphone Jack 
of the H2 exclusive use in the audio amplifier now. (Translation that can be 
easily added in case of the tube-type amplifier. they can taking out 
the output from the first side of transformer before the step is downed by 
the transformer of the tube-type amplifier.)
One company is scheduled for H2 exclusive use headphone Jack's adhering 
tube-type premain'amp to be put on the market by one model by the autumn of 
this year. It is wonderful tone quality finished though the prototype 
recently was auditioned by the combination of H2 and the amplifier.
 
I want to send you H2 and TR2. Please contact the mailing address me.

Yours very sincerely.
Takei

Thank you for your kind reply Mr. Takei your information is very interesting to me. The news about the amplifier I find to be very encouraging, I think that
it should be a very good thing for your business.
 
I an very happy and honoured that you have agreed to lend me a test sample of the headphone, and I am sure that the large community of headphone
enthusiasts at head-fi will be eager to know about the H2. I look forward very much to hearing it.

If I could perhaps ask you a few questions about the headphone:
 
Why did you decide to make a piezoelectric headphone, rather than an electrostatic or a normal dynamic headphone?
 
Did you have any difficulties with the use of the Heil Driver design?
 
I have seen some images online of an H2 with much larger brown colour pads and the headband of a different design (i attatch the images). Where these prototype models or did you change the design for other reasons?
 
Do you have any plans for a full amplifier for the H2? As an option instead of the TR2 transformer?
 
Do you have any plans for other headphone models?


Thank you very mach about the headphone review. 
I will answer your question as follows. 
1. I had developed the speaker in Sony with a piezo film 20 years ago. 
However, it becomes a decision that efficiency is bad (about 80dB) when driving with an existing amplifier . 
And Sony doesn't commercialize it , and development will be stopped. 
The sound with wonderful piezo remained in my ear, and I wanted to restart some time 
though I moved to another section and was doing another work completely. 
20 years have already passed though development was restarted in time of I  have left Sony five years ago.
In the thing and the piezo film with knowhow for which I make the best use of the piezo film, 
the thing with the feature and the tone quality of the operation that doesn't exist in 
other driving systems is the reasons why I stick to piezo.  
2. It is difficult to bond two films and mold  in wave-like . Moreover, f0 and Q are decided by wave-like depth 
and the thickness etc of one wave (CELL) of the vibration board. 
So it is important to design the wave shape that flatly sound to distributes it from a low region to a high region. 
In addition, because an electric capacity is large, the piezo film should take the impedance match with 
the driver such as amplifiers. Our knowhow including these difficult problems. 
3. The photograph that you appended is doing TAKET-H1 of the test sales four years ago. 
H1 is the hand making goods that are designed plastic parts of the cabinet and the unit by me, 
cut and assembled with the adhesive etc.Because it is not possible to assemble it,
 making is not good with a detailed processing. Only the head pad was only asked the needlework workman who 
sewed the seat of the car and sewn. Therefore, it became an ill-shaped, higher cost. 
So the metal mold by handling an industrial designer is set up for H2 to seeming
 the product and it was possible to finish it up. 
4. Because the amplifier about which it talks with the previous mail is a small output of 3W+3W, 
feeling like a special amplifier of this headphone. However, because the amplifier manufacturer is a small scale, 
it doesn't have the power only of the acquisition of CE and the UL mark. 
They put on the market in Japan in around this autumn, and say to foreign countries as a sample that they can offer it. 
So I hope a local amplifier manufacturer of every countries to add special headphone Jack to its own amplifier
 because our company doesn't have the skill of the amplifier either.
 I think it is the best that the thing to put up Jack only for our headphone is a thing 
that the value of the amplifier comes to go up. 
5. After this headphone is first admitted in users, I want to plan the following model
 though our company has various ideas.