烧音响弄不好就要烧房间的又一证实：小录音室的声学和赫姆霍兹共振

gtray520

烧不起啊这个

剧院之声

回复 20# 71sh
烧房间比烧器材省多了,也有效得多了.洋文讲的不就一层硬板,隔几厘米的空腔装墙上,腔里添加吸音棉吗,这就是低频陷阱的白话解说,能烧掉多少米.
喇叭为啥不能贴墙放呢?经过声学处理的房间就可以贴墙放.哈哈,通过房间的声学处理还能避免家庭矛盾,这个倒是没想到的

71sh

哈哈！受教了

meilei118

做一个烧友真累啊，烧到最后要烧自己了

蓝盔部队

驻波来了怕啥，房子里砌隔墙，还可以多出一个储物空间。

stillstone

找到了 试着改下

Slat-type Helmholtz absorbers are very easy to design. The formula for calculating the absorber's resonant frequency is:

f = 2160 * sqrt ( r / (( d * D ) + ( r + w )))
Where:
f = resonant frequency of the absorber in Hertz (Hz)
r = slot width in inches
w = slat width in inches
d = effective depth of slot in inches (1.2 x the actual thickness of the slat)
D = airspace depth (depth of box behind the slots) in inches

You can use a spread sheet such as Microsoft Excel to model various dimensions and tunings for slat-type Helmholtz absorbers. This can be very useful as you can easily see how changing any dimension changes the tuning of the absorber.
The formula for determining the fundamental frequency of a standing wave for a particular room dimension is:

fo = V / 2d
Where:
fo = Fundamental frequency of the standing wave
V = Velocity of sound (1130 feet per second)
d = Room dimension being considered in feet (length, width, or height)

Other standing waves occur at harmonics of the fundamental frequency - that is 2, 3, and 4 times the fundamental. Thus a room with an 8 foot ceiling has standing waves forming at 70 Hz (the fundamental frequency or first harmonic), 140 Hz (the second harmonic), 210 Hz (the third harmonic) and 280 Hz (the fourth harmonic). As mentioned earlier, rooms with smaller dimensions often have standing waves or resonance build ups that are very noticeable causing colouration at around 200 Hz or so.

For example, building a box with an airspace depth of 4 inches using wood slats 1/2 inch thick and 2-1/2 wide results in a box tuning of about 240 Hz. In practice it is not usually necessary to be extremely exact with the tuning frequency. Being in the ballpark will often work very well. In fact many slat-type bass traps are designed with slots of varying widths (perhaps plus or minus 1/16 to 1/8 inch of the design centre frequency) to cover a wider band of frequencies. Also loosely lining the inside of the box with materials such as fibreglass widens the bandwidth (lowers the Q) of the absorber.

Building and mounting multiple units perhaps with slight variations in tuning can also improve the control of colouration. Mounting multiple units throughout a room improves absorption effectiveness and promotes diffusion of higher frequencies.
沟槽型亥姆霍兹吸收器非常容易设计，吸收器的共振频率由下面公式计算：

f = 2160 * sqrt ( r / (( d * D ) + ( r + w )))

f = 亥姆霍兹吸收器共振频率 (Hz)
r =沟槽宽度（英寸）
w = 板条宽度（英寸）
d =板条宽度 (板条实际宽度的1.2 倍) （英寸）
D =空间深度 (板条后面的箱体深度)（英寸）

你可以使用扩展表比如excel来模拟不同尺寸及共振频率的沟槽型亥姆霍兹吸收器，你可以轻易看到尺寸变化对吸收器共振频率的影响

计算特定房间驻波基频的公式如下？
fo = V / 2d
fo 驻波基频
V  声速
d 房间尺寸（长，宽，高）（英尺）

其他驻波是基频的谐波，比如基频的2,3,4倍。 这样一个天花板高8英尺的房间中驻波有70HZ， 140HZ，210HZ及 280HZ。
如前所述， 小房间通常存在驻波或谐振造成200HZ左右很明显的染色。

例如 使用1/2英寸厚 2-1/2宽的木条制成空间深4英寸的盒子的谐振频率为240HZ， 实践中通常不需要精确设置谐振频率。（球场[s:47]，这句不会翻）。 其实很多槽型低频陷阱使用不同尺寸的板条来覆盖更宽的频率。 也可以在盒子内部稀疏的排列入玻纤类的材料来扩展吸收器的频宽。
制作并摆放多个在共振点略有不同的单元也可以提高对染色的控制， 在整个房间中摆放多个单元有助于提高吸收效率并有助于高一些频率的扩散。

stillstone

A        B        C        D        E
1         r= (Slot Width Inches)         0.0625         0.0625         0.0625         0.0625
2         w= (Slat Width Inches)         2.5         2         3         2.5
3         d= (Effective Depth of Slot Inches [1.2 X actual thickness of slat])         0.3         0.3         0.3         0.3
4         D= (Airspace Depth Inches)         3.75         3.75         3.75         4
5                                       
6          f= (Resonant Frequency Hz)         281.20805         302.46050         263.88600         278.39120
7

罗汉

真的需要人来重新翻译一下了我看不明

魔人啾啾

本来环境就是音响的基础。一直被忽略。

最爱麦景图

很多人连自己的器材都没烧好，还谈什么烧房子