Basal condition of chapter of Nagaoka [tetsuotoko] speaker attention
What is the chapter of the Nagaoka speaker attention?
I faithfully reproduce it as much as possible like 15 models of a popular speaker of the Nagaoka [tetsuotoko] teacher whom Oyama [mikioto] chose being written in Nagaoka [tetsuotoko] teacher's book. It doesn't remodel at the stage of the start at all, a data measurement and a personal review are written with a unit of the speaker enclosure and the Nagaoka master recommendation of a Nagaoka [tetsuotoko] original teacher, and it evaluates it. Various experiments are tried afterwards as the unit is changed to the latest one and an objective explanation is tried as much as possible centering on doing [supeanade-ta].
Purpose of attention report
The common denominator and disagreeing of wanting my clarification of the mechanism of the speaker of a very excellent Nagaoka [tetsuotoko] teacher (chiefly backing loading center), and popular Nagaoka [tetsuotoko] teacher's speakers wanted to arrange the research and the Nagaoka speaker of something FOSTEEX unit and to arrange knowledge systematically. Improving the level of audio of I must take delight in music more than now in good environments. Improve my woodwork technology and painting technology, and improve the speaker production technology. The desire said that a dissemination etc. useful for the person who has similar tastes even a little can be done, and it can do various exchanges is a prevailing purpose. It is a very welcome like the opinion and the criticism, etc.
Basic condition of attention
When what refusal doesn't put it, it becomes a measurement by original of the following conditions. When the influence on the sound (data) is large like the item written up, it thinks about Oyama though these conditions are the one changing even by one for it to have a big influence on the sound (measuring data).Room
The room used for the measurement is one room of the top floor of five stories in the reinforced concrete apartment house. I think that it is an average size of the one room in the apartment house in Japan though the size is considerably narrow judging from about seven mat [hode] and a general listening room. SN is not too bad because it is away from the Main Street. When the sound pressure is softly raised, the floor ringing is awful in the floor though the mat of the urethane is paved on the carpet. The sound considerably leaks to room next to mine by plasterboard one with one of.. ..wall.. reinforced concretes.
Method of setting up speaker
Two is set up in the direction of the short vicinity of the room of 6 - mat room. It puts it together for a full cooking stove and the multi way between centers of a central cap so that the distance at tweeter intervals' may become 1m30 centimeter. The angle is inclined by about 25 degrees aiming at the listening point because of the inside. It separates from the wall in the right and left and the back by 15 centimeters or more. The speaker will be put soon for the floor type speaker on the floor. The setting does height to the one of a small type and the book shelf type (BS-8, BS-10, and D-10, etc.) so that the tweeter may come to the height of the ear when blocks of several are piled, and it sits on the floor [betani].
Volume of amplifier
The volume is fixed position of the volume of a constant input and the amplifier it done. It is not so-called ratings 1w input. The volume position of the amplifier is adjusted as the volume when it thinks based on the Swan speaker (equipped with FE108S), the pink noise is originated from this speaker, and it picks it up from the mike becomes fit 75db. 1w or more is sure to enter though it differs from an actual volume because this 75db doesn't do the calibration accurately. Because it is a relative value that want to know, it is unquestionable in this. The efficiency of a speaker here in a word is it whether is higher ..what db.., and lower than super-Swan.Measuring method
The 49th PINKNOISE "AUDIOTEST CD" of the Sony Music entertainment is thrown from the CD player. 1m and height are exactly set from the axis to the position of the tweeter from the mike to the distance of the speaker for a full cooking stove and the center and the multi way of a central cap. This distance and the angle of the mike are done to make the position the same strictly by using the same majors every time so that it may give birth to the measuring data to a big difference by a little difference.
Measuring instrument machine list
| Use PC | Making PC by oneself |
| Mike | BEHRINGER ECM8000 |
| [Fantamu] power supply | EURORACK UB802 |
| Frequency measurement software | Electron positive Ltd. DSSF3 of good luck real-time analyzer |
| Source | AUDIO TEST CD-1 |
| [Purimein;anpu] | DENON PMA390�W |
| CD player | SONY DVP-NS730P |
| Cable | Original cable made of Egawa atelier |
