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
SACD/DVD player : MARANTZ DV-8300, DENON DBP-1611UD、OPPO
BDP-93
Cassette Recorder : Matsushita RS-275CU
FM/AM tuner : Matsushita ST-3600
HDMI decoder : Onkyo SA-205HDX (Modify 1, Modify 2)
PC audio interface: Aim AS372 (for USB), ASUS XONAR
D2 (for PCI)
Surround decoder : Handmade QS/SQ logic decoder,
Sansui QSD-1 (Evaluation
only), Sony SQA-2030 (Modify)
(Evaluation only)
Pre amplifier : Handmade (Kaneda Early 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
Source
The motor
is synchronous type (Unlike the belt-type or a servo motor type, it is merit
that it is not broken in semi-permanent).
SACD is a Marantz DV-8300, but because of increased reading errors, it
moved to DENON DPB-1611UD, but since the occurrence of mute has recently become
prominent, it is preparing to move to OPPO BDP-93.
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. I have
been using it for over 45 years, but for the time being, Kaneda-Type will
continue to work.. (However, the Kanada method is characterized by the fact
that it has been simplified and is vulnerable to external disturbances, and is
designed to be concerned with the power supply, etc. Also, the D-S voltage of
the first stage FET is high and the Gate impedance is low, resulting in poor DC
stability )
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 subspeaker). The inside and circuit.
Main
amplifier
At first, I made my own SEPP
OTL amplifier (at the time when the transistor was sensitive to heat), but it
failed because the power TR was broken during adjustment. Therefore, I could
not endure the fragile transistor, and I made 6BQ5 single etc. next, but I was
disappointed by the so-called vacuum tube sound (which is a low tone without
tightening) and immediately discarded it. Next, I was induced by the vivid sound
of Kaneda amplifier I heard at an acquaintance's house, and I made my own DC
power amplifier and used it for a while. (However, I remember that the
stability and sound quality were not the best because of the Kanada-style dead
copy, as well as some component changes and circuit changes.).
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
100kΩ, so hum is entered, so change to 20kΩ. 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.
Designed with top priority not being affected by disturbance.
This is the
latest version of the main
amplifier for the sub-speaker, which is the internal, latest circuit
and printed circuit
board. Again, this was
designed with the highest priority not being affected by disturbances, so the
operation was stable and it worked, and clearer sound quality was obtained.
(The DC offset is about 1mV and the DC servo circuit is omitted.)
4-channel main amplifier
for sub speaker, inside.
This time again, it was designed with IC (LM1875) again, but some power
shortage cannot be denied, but the sound quality as expected was obtained, good
or bad. The 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 right、if
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 size and 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 T925(T925A was not
installed to a baffle board). 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). Incidentally, it is a
frequency characteristic measured with an omni microphone from a distance
of 50 cm.
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.
Headphone
Sennheiser HD-414 (the
sponge rotting immediately). However, headphones and earphones are hardly used.
The reason is that it is very disturbing to use and very tired when listening.
The main reason, however, is that it is not possible to evaluate the sound
quality with the ear alone. (As is well known, ultra-low pitch, ultra-high
pitch, sound reverberation, musical instrument position, etc. can not be
recognized at all by the ear alone)
Being
also music appreciation and book-reading to be hobby.
Library
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.