Simulation and design of the ATL-Speaker V2 [ATL-Speaker]
2012/05/2
Simulation and design of the ATL-Speaker V2
Fig.1
Simulation
It is almost the same as V1. However, I would make a natural sound or would like to pursue structure.
In the simulation of V1, bass sound that extends to 30Hz. In V2, the design and a flat frequency band from 50Hz to 100Hz a little changing the bandwidth.
The sound of the movies are very good in V1.
In music appreciation, the effect of the decline of around 80Hz that is too long to be a resonance tube.
The resonance tube was 130 cm shorter 40 cm than V1.
Cross section of the resonance tube was r1=9.5cm, r2=5.0cm thick and slightly more V1.
Simulation characteristics were obtained seems to be a result of the bass, and relatively good.
In addition, the matching is so good with several speakers.
Also considered other work close to the bass reflex, even when viewed from the shape, was carried out (2) its simulation.
Also this time "The design program for its original work speakers" was used.
Four units of Alpair7V3 (Mark Audio), W4-927SE (TANG BAND), W4-930SC (TANG BAND), and W4-1320SJ (TANG BAND) carried out the simulation.
(1) The simulation in a resonance tube with a taper
When it resonates at 130cm, lambda/4 are 65Hz.
L=130cm,r1=9.5cm,r2=5.0cm, when it came out and calculated, the result of the simulation became an abbreviation flat from 50Hz to100Hz
The amount of sound absorbing material in this program, that displays the results in the ordinary.
AlpairV3 w4-927se
w4-930sc w4-1320sj
(2) The simulation of bus reflex operation
A tube was assumed to be air chamber and B tube was assumed to be port of a bus reflex.
The air chamber is 21 liters and it is as average r=5.25 cm in radius of port. port length was inputted as L=35cm.
In manual calculation, since it is 65hz, a simulation has the difference in 10hz.
AlpairV3 w4-927se
w4-930sc w4-1320sj
The design of ATL-Speaker V2
The design method wrote L=130cm r1=9.5cm r2=5.0cm exponential curve calculated in the simulation, and wrote Fig.1 from the cross-sectional near it.
Value of folded portion d is taken greater than 5mm .
Fitting of numeric data
ATL-speaker Ver.2 cross section graph
Specifications of ATL-Speaker V2
Acoustic transmission line speaker specifications
Rendering type resonator was a tall boy speaker in Fig.1.
Board thickness：15mm
Size：17.0cm wide (lower plate: 27.0cm)
Depth：26.0cm (lower plate:: 32 cm)
Height：1.0m
Inside dimension：14.0cm width
a = 19.0cm , b = 16.0cm, c = 8.3cm, d = 8.0cm,
e = 6.8cm, f = 5.6cm, g=5.6cm
Tube length：1.3m
Folded time： Once
Target bass ： 55Hz
Speaker Unit Available
：W4-930SG, Alpair7v3, W4-1320SJ, W4-927SE, etc.
Impressions
If it makes with a slightly thick resonance tube even if it shortens 40 cm, the almost same bass effect as V1 can be given.
And prevention of interference is also aiming at the port by separating from a speaker.
There is no influence which depends on overtone peculiar to a resonance tube in an abbreviation flat to 50 Hz in the simulation of a bus reflex.
Then, why was not a pure bus reflex but ATL chosen?
Now, V1 in use is heard, ATL is the structure of being hard to be subject to the influence of the back pressure of a speaker, and its growth and all of minute signal & dynamic range & growth of bass sound are wonderful.
The structure of ATL is felt as the speaker which unified the resonance tube and the bus reflex.
These two structures are felt for the speaker which took both good things.
Reference WEB
Acoustic transmission line（Wikipedia）
http://en.wikipedia.org/wiki/Acoustic_transmission_line
The design program for its original work speakers
http://www.asahi-net.or.jp/~ab6s-med/NORTH/SP/index.htm
お久しぶりです！＾＾
結局、翻訳ソフトのお世話になりました。(恥)
by song4u (2012-06-20 20:42)
song4u様
恥ずかしながら、翻訳ソフトを使いました。
外国からのアクセスが10％ぐらい在りますので、一様分かればと書きました。日本人と、外国の方とでは感性が違いますので巧く翻訳はできていないと思われますが・・・
by Sasha (2012-06-21 08:42)
こんばんは。
なるほど、そういうわけだったんですね。
一瞬、何が起こったのかと思いました。(笑)
海外からのアクセス、凄いですねえ！
だけど、記事の内容は書籍にも負けないようなものですからね。
インターネットに国境なし！ いい時代になったモンですね！！
by song4u (2012-06-21 20:01)
こんばんは
以前から、新型設計は翻訳版を書いています。
インターネット上での隣人は、世界です！
Blogを書くことはネット上で裸に成ることです。
確かに良い時代ですが、隣人が多すぎて怖いのも事実です。
それでは、、
by Sasha (2012-06-21 21:58)