可近牆座地喇叭?

terryc

回復  terryc


    你對係超重型書架加半座地混合體
fuman0123 發表於 2012-2-15 06:14

    「書架加半座地混合體」都可以咁講啦 但佢要上腳架先會好聲，唔可以直接放在地面上

ckw3031

我前後牆十七呎，試來試去，喇叭面計起離前牆四呎半最好位置。

tomc

For all Ching reference:

Setting Up Speakers In A Rectangular Room
by George Cardas

Very precise speaker placement can open up a whole new dimension in listening, so I will outline the system that is becoming the standard of the industry. This standardized listening room is a Golden Cuboid and is the model for the math used in this system. This method will work with any box speaker, in any reasonably sized rectangular room. You may find that you have already positioned your speakers this way by ear.

Active nodes are the main concern when placing speakers in a rectangular room. A node, or the frequency where speakers and parallel walls interact, is proportional to the speaker to the wall distance.

The three most importance nodes, in order of importance, are proportional to the distance between the speaker and:

1. The side wall nearest the speaker
2. The rear wall
3. The side wall across from the speaker
A secondary factor is the speaker-to-speaker time constant.

When you use this Golden Ratio method to set your room up, the speakers are placed so the three nodes progress or differ from one another in Golden Ratio. This eliminates any unison or near unison resonance in the nodes.

Panel or dipole speakers such as Apogees and Magnepans cancel their side waves, so a formula of .618 x the ceiling height can be used for determining placement from the rear wall. Most box speakers radiate low frequencies in all directions thus a formula that places the speaker to rear wall distance at 1.618 the side wall distance should be used.

Speaker placement, simply stated  

The distance from the center of the woofer face to the side walls is:

Room Width times .276 (RW x .276)
The distance from the center of the woofer face to the wall behind the speaker is:

Room Width times .447 (RW x .447)
This is all you need to know to place speakers in a symmetrical, rectangular room!



--------------------------------------------------------------------------------

Diagram A Distance Percentage
Speaker to side wall: RW x .276
Speaker to rear wall: RW x .447
Speaker to opposite side wall: RW x .724
Speaker to speaker: RW x .447

avlam

For all Ching reference:

Setting Up Speakers In A Rectangular Room
by George Cardas

Very precise ...
tomc 發表於 2012-2-15 14:13

有冇中文版呀?

tomc

有冇中文版呀?
avlam 發表於 2012-2-15 14:16

矩形空間的喇叭調整/George Cardas
李建德編譯

本文為Cardas線材設計者George Cardas所撰寫的文章，原文題目為「Setting Up Speakers in a Rectangular Room」，闡述了George Cardas個人對喇叭擺位調整的經驗談。雖說本文談及的運算方式，是建立在「黃金立方體聆聽室」的基礎上，但是對於一般接近矩形空間的聆聽室，應該都可以從中獲得驗證。此外，George Cardas所提出的空間比例理念，也值得音響迷們深入瞭解。


非常精確的喇叭擺位，確實能夠開啟聆聽的新視野，所以我要告訴您一種目前正逐漸成為業界標準的喇叭擺位方式。在經由數學運算而得的黃金立方體（Golden Cuboid）標準空間裡，這種擺位方式能夠適用於任何平面或箱型喇叭，與任何合理範圍內的空間尺寸作搭配。或許，您最後會發現自己仰賴聽覺的喇叭擺設方式，與我所要談的方法不謀而合。\r
在長方形空間的喇叭擺位上，有三項重要關鍵值得特別注意。其中每一項關鍵都代表喇叭與平行牆面之間的相互影響頻率，也就是喇叭與牆面距離之間的比例關係。
這三項重要關鍵依重要順序為：
一、 喇叭與最接近之側牆的距離比例。
二、 喇叭與後牆的距離比例。
三、 喇叭與對面側牆的距離比例。
次等重要的關鍵，就是喇叭與喇叭之間的時間常數。
當您以下列的黃金比例完成聆聽空間擺設，喇叭的位置將會影響這三項重要關鍵，進而抵銷任何單一或接近單一的共振現象。


進程A
圖A：矩形對稱房間之喇叭擺設




喇叭擺位，可以從簡單的方向開始……

喇叭低音單體的中心線，到側牆的距離應為：
房間寬度乘以0.276（RW×0.276）

喇叭低音單體的中心線，到後牆的距離應為：
房間寬度乘以0.447（RW×0.447）

這就是您所需要知道的長方形對稱房間之喇叭擺位方式（見圖A）

距離                     比值
喇叭到側牆：RW×0.276
喇叭到後牆：RW×0.447
喇叭到對面側牆：RW×0.724
喇叭與喇叭之間：RW×0.447

tomc

for updated

avlam

for updated
tomc 發表於 2012-2-15 14:33

Thx !

tomc

Thx !
avlam 發表於 2012-2-15 14:46

總共有五款擺設，有無師兄有興趣睇埋呢？

avlam

總共有五款擺設，有無師兄有興趣睇埋呢？
tomc 發表於 2012-2-15 15:15

緊係好啦！

fuman0123

回復 85# tomc


    莫非此奶傳說中既黃金比例