Unprecedented mechanism of sound emission,

while following a conventional technology for the loudspeakers ―――

――― Acoustic Neo-Paradise Half One

Many conventional loudspeakers have as their ideal "a infinitely small breathing ball" namely "a spherical wave", and the realization of this ideal is perhaps a challenge. The driving force for this challenge are a non-divided oscillation in the oscillating system and a linear-oscillating motion. We put specific processing of extracting a non-linear motion and a non-spherical wave to a loudspeaker unit and succeeded in getting "the energy of the rich sound like an acoustic musical instrument".

This figure shows frequency response at the front of Half-One. It sounds richly and smoothly from bass to treble, and can be used for any applications that demands it. It exerts an unparalleled ability not only to reproduce the existing recorded media but also to sound for musical instruments etc.

Mechanism of Sound Emission

Half-One has been realized them by modifying the conventional loudspeaker unit to our original mechanism of sound emission. Additionally, there is no enclosure(cabinet) and no horn which are neccessary for conventional loudspeakers to obtain the spherical wave. Your listening room would be filled with rich sounds, from bass to treble, falling like brilliant rays.

The low range of Half-One is radiated from the remaining half of the cone paper. Most of mid to high range radiates directly through the voice coil, and this shows equivalent response in condenser speaker or ribbon speaker. It is a big characteristic of this loudspeaker that different sound mechanism in each range is streaming together smoothly.

That is the specific character of Half-One, which is different from other conventional loudspeakers.

It resounds over a wide range (bass in the vertical direction and the mid treble at 40-degrees to the horizontal) which is difficult to imagine from its appearance.

High-sound area Low-sound area

Half One

Conventional loudspeaker


The reason why Half-One plays a fresh sound is that the voice coil, which is the basis of sound emission, is completely exposed. In other words, in all loudspeakers except for ribbon and condenser types, the voice coil fits entirely within a magnetic circuit and therefore is not exposed at all, but we have freed the voice coil to the exterior.

And another reason why Half-One is quite excellent is that its transients are close to operation of ribbon and condenser types in the medium and high sound range. In normal designs, the voice coil is enclosed in a type of pot, but it can get a characteristic like the conventional winding structure by leaving a magnetic circuit open.


Half-One rapidly loses its energy below the lowest resonance frequency, due to its lack of enclosure, when compared with loudspeakers of the same vibration area. However, it can produce the same transients as the musical instruments because it is not affected by a braking performance specifically found with enclosures.

How to play Half One

Half-One connects directly to the output of the power amplifier and operates. As Half-One is a complete full-range speaker, the LCR filter should not use due to impair the purity of the sound. In order to derive the excellent frequency range of Half-One, dedicated equalization is required. However, it is also possible to enjoy native sound without equalization.

When used in general households, the recommended output power of the power amplifier is about 10W to 100W. If your amplifier has further output power, please adjust it to a reasonable level.

In the future, we will develop DSP for FFT filter as exclusive equalization of Half-One.

Also, we are looking for co-developer of the hardware that has ability of equalization in real time.

Half-One uses Personal Computer as a player. We recommend software player equipped with FFT filter, and our recommended software is Audacity or WaveGene. The compensated curve (equalization) data for Half-One which is measured in an anechoic room individually is attached as Audacity format. The sound data processed by this equalization is able to write into CD-R, or convert it to MP3 as an ordinary audio signal.

Equalization should be handled by higher over-sampling. You can get the right that the audio data (for up to one hour) you send to us would be handled to exclusive equalization for Half-One through more sophisticated processing way and return to you.


No expose to direct sunlight

Putting it in environment with less magnetic material powder (sand iron etc.) Therefore, do not put it directly on the floor or ground.

Do not bring magnetic recordings close to each other.

Avoid environment with high humidity, high temperature, or extreme low temperature

Putting it in a place not touched by children's hands
(It is a feature of Half-One that the voice coil and the magnetic circuit are exposed, but if it comes into contact to the vibrating part with the hand or foreign matter, it will cause malfunction)


Are there any accessories?

Filter data derived from the characteristics of Half-One measured in an anechoic room is included. By adding the equalizing derived from this filter data to your sound source, you can enjoy more flat audio characteristics. We will be able to pre-equalize to your music library up to 1 hour if you wish so.

Also, we are looking for co-developer of the hardware that has ability of equalization in real time.

Do you accept after-sales support?

We are ready to accept after-sales service as much as possible. Since Half-One exposes the magnetic circuit, dust such as iron powder may get inside the Half-One. Regarding troubles caused by such contamination, repair is accepted free of charge only once per unit.

In the case of re-cone, we accept it as repair for a fee. However, we will support your unit to maintain its best condition as far as possible.

Is it possible to cut off the unit I would like to and make similar one?

In principle, if the unit has its re-cone kit, we can cut it like Half-One, but it does not necessarily guarantee similar characteristics. Regarding this matter, please contact us.

Half One

Product Price

 $ 3,000.00 / single unit
 $ 5,000.00 / stereo pair


・Response characteristic graph of individual product
・Equalization data of individual product
・1 hour equalization processing right

Charged Option

・Replacement of cone-paper (re-cone)
・Preferred purchase right of DSP


Nihon Onkyo Co.,Ltd. 1-3-9, Deshiro, Nishinari-Ku, Osaka-City 557-0024 Japan

Open:9:30-18:30 on Mon.-Sat.(except 2nd.& 4th. Sat.)

Phone : +81-6-6633-6125

FAX : +81-6-6633-6127


mail address