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I would like to express concerning one audio of hobby

Configuration (Placement, front, left, wiring)

Turntable : Pioneer MU-7 (synchronous and rim-drive)

Arm : Audio Technica 1005MK2 (Airlift 6005 it is attached)

Needle : Matsushita 205MK2 205CMK2-X, Ortofon LM20


Cassette Recorder : Matsushita RS-275CU

FM/AM tuner : Matsushita ST-3600

HDMI decoder : Onkyo SA-205HDX (Modify 1, Modify 2)

Surround decoder : Handmade QS/SQ logic decoder, Sansui QSD-1, Sony SQ`-2030 (Modify)

Pre amplifier : Handmade (Kaneda Type)

Main Speaker System Channel divider : Handmade (3way 24dB/oct)

Main Speaker System Main amplifier : LUX A501 (- 560Hz), LUX A501 (370Hz – 5.4KHz), LUX A501 (5.4KHz -)

Main Speaker System : JBL 2215A (- 560Hz), JBL LE85 + Coral AH500 (370Hz – 5.4kHz), Foster T925 (5.4kHz -)

Sub Speaker System Main amplifier : Handmade (90W), Onkyo A907X

Sub Speaker System : ParcAudio DCU-171PP (- 650Hz), Onkyo HM500A-MK2 (650Hz - 8KHz), Matsushita 5HH10 (8KHz -)

3D Speaker System Channel divider : Handmade (2way 18dB/oct)

3D Speaker System : Foster FW-208N (- 100Hz), ParcAudio DCU-F081PP (100Hz - 5KHz), Foster FT96H (5KHz -)

Surround Speaker System Main amplifier : Handmade ( 6 channel 80W )

Surround Speaker System Sub Main amplifier : Handmade ( 6 channel 38W )

Surround Speaker System (front and rear) : WAVECOR WF118WA01 (- 2KHz), DAYTON ND20FB-4 (2KHz -)

Headphone : Sennheiser HD-414

Display : Panasonic TH-L17C10

HD Recoder : Panasonic DMR-XW30, Panasonic DMR-BR550, Panasonic DMR-XP11, Panasonic BW-695


The motor is synchronous type iUnlike the belt-type or a servo motor type, it is merit that it is not broken in semi-permanent).  Is playing in the DV-8300 Marantz mainly SACD / CD. Currently, reading error because the increase, it is being used in a combination with DPB-1611UD of DENON. (operability will degrade very)

Pre amplifier

Noise due to leakage flux of the power transformer (by layout miss) occurs to dead copy of the C22. Also occurred (that can not be avoided therefore Tube) also microphonic noise (Howling). As a result, S/N is poor and can not withstand practical use, so retired immediately after completion. Inside that upside and downside. The circuit.

Successor, now the bosom oak it is, (Initial single-ended type) Kaneda Type. The inside and circuit. Nearly 40 years it was active service. Recently, producing the operational amplifier type EQ amplifier, you saw, but the sound quality does not completely serve to the Kanada system of discrete system, active service of Kanada type may continue for a while.  (However, at the time Kaneda Type was simplified, consideration to disturbance such as power supply fluctuation was weak. For that reason, it became easier to be affected by the power supply, and became a design that sticks to the power supply. That is the characteristic of the Kaneda Type at the time and it is a drawback.)

Channel divider etc.

Channel divider (for 3-way multi-system)​​. The inside and circuit. Also put low boost function.

Channel divider (for 2-way 3D system)​​. The inside and circuit. Also put low boost function.

Bass distributor (for surround system)​​. The inside and circuit.

Low boost amplifier (for sealed sub​speaker). The inside and circuit.

Main amplifier

For the main speaker, initially tried several tube amplifier and DC amplifier. However, since the speaker does not have the merit of handmade, the main system consists of Kinsui A 501 kit, finished product and junk repair item. It was disappointing because the A501 (solder confirmed) finished product had the same price as the kit.

Although not described in detail, since the shield is weak and ham enters in A 501, it is necessary to drop the punch metal part to earth. Also, the input VR is also as high as 100k, so hum is entered, so change to 20k. Circuit of the LUX A501.

6-channel Main  amplifier for the sub speaker. But using the power op amp, the sound quality far exceeding expectations was obtained. The inside1 and inside2. The circuit.

Main amplifier for the sub speaker, is an internal. Circuit of this time, I was designed with discrete components. Felt a margin of power,  better or bad, got the sound quality I expected. The circuit.

6-channel Main amplifier for the sub speaker, is Rear,is an internal. This time designed it with IC, but can not deny the lack of some margin. Better or bad, got the sound quality I expected. The circuit.

Main amplifier for the sub speaker. But using the power op amp, the sound quality far exceeding expectations was obtained. The inside The circuit. The reason why good result was obtained is that the drift of the DC offset which is the cause of the sound quality deterioration due to the operational amplifier is small and the DC servo which is the cause of sound quality deterioration is unnecessary probably.

6-channel Main amplifier for the sub speaker. Also designed by the IC again this time, but do not deny some margin shortage, the sound quality far exceeding expectations was obtained. The inside. The circuit.

Main amplifier for sub-speaker, internal. For this time, I made the printed circuit board raised in a discrete configuration with reference to the power op amp circuit. The sound quality as expected was obtained. That is the circuit. (Simplified it omitting DC servo circuit. latest circuit and printed circuit )

Speaker System

As for the speaker history there is a variety.

Speaker system 1, coral beta-10, Onkyo HM500MK2 and dual Matsushita 5HH17G. It is 4.7m of back load length, but cannot revitalize a low level in comparison with the size of the box at all (Because an opening is small) resonance is big and because the tweeter is arranged into left and rightAif interference occurrence (you try thinking prosperously in left and right direction, natural). It became same retirement, there is no either storage space and became incineration. The gallant figure which is not now when the net is removed. And, the internal constitution. Appearance was involved , the red carpet is placed on top. (I remember, It was a sound quality there is no salvation like, but only the drums and piano and was the sound of a powerful fairly)

Speaker system 2, was configured with Matsushita 5HH17G and Onkyo HM500 and Pioneer PWA38. Box is 500 liters that is currently in use. Other, was too underpowered when compared to squawker of Onkyo. Resolution and efficiency of the tweeter is low. The division of vibration woofer, the sound of the mid-high range is emphasized in particular, it did not bear to listen. However, SP most of this trend is not a little. However, I remember the sound of the mid-range was a delicate sound than those of today. circuit. It is the frequency response on the axis 50cm. By the way, 5HH17 is called a horn, but the structure is a direct radiator (dome), so of course it is not the sound of a horn.

Speaker system 3, it becomes the present front speaker. It's a board-cutting. The JBL 2215B, LE85 + horn the Coral (threw away the shortcut horn and the acoustic lens of LE85 attachment, (The sale of this combination, I think I have great doubt)), with Foster T925iT925A was not installed to a baffle boardj. 400Hz, the 6kHz cross. frequency response (old bass reflex) which was measured with the 50 cm on the axis.

Recently, the urethane edge of the woofer rotted, being to start falling, repapered. (As much as 2 days depended on exchange) furthermore unhappiness to continue, the LE85 press of the diaphragm being not tight that tilted and became the way which the voice coil rubs.

You cannot correct only this.... Some days ago, it meaning that medieval times enter into the hand, when you exchange, improvement of the normal position. sound quality which becomes substantial was assured. The place was disconnected, after that 1 year, the woofer which exchanges the with special care edge.

(As for cause corrosion of voice coil). However, being fortunately, to be able to procure the changing cone of the JBL 2215A, it exchanged and it was possible to make revive. The cone to become original color, also sound, from the sound which dries, to return to the sound which has the moisture, because it could experience original sound, the happiness the in unhappiness? But the happiness did not continue, and an urethane edge rotted again and changed it. (At last the urethane gives up; and to an edge made by a nonwoven fabric)  The left frequency response, right frequency response (The edge material changed and some resonance increases occurred). Recently, creating a channel divider 24dB/oct, I was changed to three multi-channel system. Because the bandwidth of the 2215A is about 400Hz, the cut-off frequency of woofer side is 560Hz instead of 370Hz. As much as possible, missing middle reblogged so as not to occur. Latest, left frequency response, right frequency response.

I explain this speaker theoretically. Attaching the foot, it raised, escaped from the baffle effect. At the beginning, to a bass reflex, irregularity of the Doppler effect with the curvature of the Vinyl disk was prevented, because CD is unlike LP the warp of the board, it designated to close (So that low level was natural, and the resolving power was high, and it was improved large sound quality). However, because also the expensive speaker prevents resonance, it wants heavily and making use of the strong box while (you cannot avoid sound quality deterioration) as for having made bass reflex it is doubt truly. The woofer installed by way of the sub baffle, prevented resonance. You removed unit from the center, avoided corner interference. In order to put out the 30Hz with the 38cm, it made the 500 liters. In addition, the tweeter of a JBL system has muddiness of sound, and since the physical characteristic is not good, either, it has not been adopted.

However, the outline of a square close to the internal standing wave is not taken into account in theory is not good. (Non-prime Relations) In addition, room resonance disturbance of 80 Hz and 200 Hz is difficult to suppress. By the way, it is truly regrettable to be the tendency which recently does not place the frequency response and so on, physical quality of the speaker even in the specialized magazine.

@Speaker system 4, the going down of the front speaker of former times the rear speaker it installed the machine. Pioneer PWA38, Onkyo HM500MK2 With Matsushita 5HH10 650Hz and 6. 5kHz crosses. The frequency response.  Because other than sound, the HIFI it is inexpressible even in compliment, in regard to this you do not feature. In addition, this speaker is now retired.

@Speaker system 5, as for the machine being the old sub speaker (Ceiling speaker) for surround verification, in order all to make channel identical those which it produces in height. From frequency response, low range does not have the solution. As for the frequency characteristic of the upper range, a ratio is obedient, but the cloudiness of the sound by the division vibration is not avoided because it is cone. (unit is Foster FE83)

@Speaker system 6, as for the machine being the 17 liters sealed type new sub speaker for surround verification, in order all to make channel identical those which it produces in height. Using  WAVECOR WF118WA01 (- 2KHz), DAYTON ND20FB-4 (2KHz -). It's a shape,board-cutting. From frequency characteristics of the naked(upper fig)/the post-low boost(Lower fig), low-frequency correction at low boost. So that frequency response is relatively flat. The sound quality is straightforward. Alright well super bass, the subwoofer does not feel the need at all. However, because it is a direct radiator, even if the Frequency characteristics are flat, it cannot escape from the natural vibration, so the sound is not real, and because of its small diameter, a large volume cannot be produced. circuit. Will be able to prevent tipping (somewhat).

@Speaker system 7, new sub speaker (and set saran net). Manufactured in a the 38 liters sealed, but be possible to cope with the bass reflex type. Using  ParcAudio DCU-171PP (- 650Hz), Onkyo HM500A-MK2 (650Hz - 8KHz), Matsushita 5HH10 (8KHz -). It is a board-cutting. From the frequency characteristics, super bass can not be played, but the sound quality is real and delicate. circuit. For reference, the frequency characteristics at the time of the sealed type (blue), bass reflex type (black), sealed + low boost (red).

@Speaker system 8, new 3D sub speaker. Using  WAVECOR SW215WA01 (-100Hz), ParcAudio DCU-F081PP (100Hz-5KHz), Fostex FT96H (5KHz-), 25 / 44 liters bass and the 8.5 liters treble. It is a board-cutting (can change the volume). Bass-Reflex also sealed it is also available. circuit. For reference, the frequency characteristics at the time of the sealed type (blue), bass reflex type (black), sealed + low boost (red).  Usually, listen in a bass reflex type. (It is the final frequency characteristic) Currently, DCU-F081PP is exchanged for TangBand W3-881SJF.

@Speaker system 9, new Bass-Reflex sub speaker. Using SB Acoustics SB13PFC-4(-300Hz), ParcAudio DCU-F081PP(300Hz-5KHz), Dyton AMT mini-8(5KHz-), 22 liters. It is a board-cutting (Include spare baffle). available. circuit. For reference, the frequency characteristics, Currently, DCU-F081PP is exchanged for TangBand W3-881SJF. the frequency characteristics.

Because the horn speaker resonates, the thing to put in case without fail. It hang or without locking it, it is out of the question.

Actually, Speaker system 0, Matsushita EAS-20PX27 was used you removed from the machine and the back load, Coral beta-10 was used in bass reflex. Speaker system 1.5, it had the machine, but also the sound quality badly being either the data not to remain, you exclude.


Sennheiser HD-414 (the sponge rotting immediately). However, headphones and earphones are hardly used. The reason is that so disturbing, and very tired when used. However, the biggest reason is that it can not be used for sound quality evaluation. (It is well known that people can not listen to super bass, super treble, ambient sounds, etc. with only their ears)


Being also music appreciation and book-reading to be hobby.


Main in the book library is SF.

Main in the record library is VINYL disk.

Main in the game library is DOOM.

Something more

Story will turn, but it is chip of 4004 BUSICOM Japanese company has invented. Larger one 2k bit EPROM. Function of logic operation of 4004 is weak. Therefore, it is said that it is not in the world's first microcomputer strictly. However, the concept is unmistakably microcomputer. It is one of the great inventions of the 20th century that are not written in the History of Technology.