- 积分
- 1245
- 在线时间
- 993 小时
- 最后登录
- 2024-5-5
- 阅读权限
- 70
- 精华
- 0
 
- UID
- 849380
- 帖子
- 1226
- 精华
- 0
- 经验
- 1245 点
- 金钱
- 1215 ￥
- 注册时间
- 2018-6-1
|
最近突然发现房间的声学处理是多么重要，为什么在商家那里听得美轮美奂的音响，捧回家之后就变成了黄脸婆，
关键是商家的听音环境是认真处理过的，我们自己家里各种不对称各种玻璃墙各种瓷砖地砖。。。
小房间不能听低频是一种误解，前提是房间要做合适的声学处理
http://ethanwiner.com/acoustics.html#sb3
另一个常见的误解是小房间不能 再现非常低的频率，所以它们根本不值得治疗。 一个受欢迎的（但 不正确）理论是非常低的频率需要一定的最小房间尺寸才能 “发展”，因此根本不可能出现在较小的房间里。 事实是 任何房间都可以再现非常低的频率，只要引起的反射 避免了声学抵消。 当您添加低音陷波时，您正在制作墙壁 低频反射较少，因此撞击墙壁或天花板的声音会被吸收 而不是反映。 最终结果与墙不存在时完全相同 全部 - 或者好像墙很远 - 任何回来的东西都会大大减弱 由于距离，因此声音不足以引起尽可能多的消除。 见 侧边栏 Big Waves，Small Rooms 对此进行详细说明 话题。
SIDEBAR: BIG WAVES, SMALL ROOMS
There is a common myth that small rooms cannot reproduce low frequencies because they are not large enough for the waves to "develop" properly. While it is true that low frequencies have very long wavelengths - for example, a 30 Hz wave is nearly 38 feet long - there is no physical reason such long waves cannot exist within a room that is much smaller than that. What defines the dimensions of a room are the wall spacing and floor-to-ceiling height. Sound waves generated within a room either pass through the room boundaries, bounce off them, or are absorbed. In fact, all three of these often apply. That is, when a sound wave strikes a wall some of its energy may be reflected, some may be absorbed, and some may pass through to the outside.
When low frequencies are attenuated in a room, the cause is always canceling reflections. All that is needed to allow low frequency waves to sound properly and with a uniform frequency response is to remove or at least reduce the reflections. A popular argument is that low frequencies need the presence of a room mode that's low enough to "support" a given frequency. However, modes are not necessary for a wave to exist. As proof, any low frequency can be produced outdoors - and of course there are no room modes outdoors! Top
Here's a good way to look at the issue: Imagine you set up a high quality loudspeaker outdoors, play some low frequency tones, and then measure the frequency response five feet in front of the speaker. In this case the measured frequency response outdoors will be exactly as flat as the loudspeaker. Now wall in a small area, say 10x10x10 feet, using very thin paper, and measure the response again. The low frequencies are still present in this "room" because the thin paper is transparent at low frequencies and they pass right through. Now, make the walls progressively heavier using thick paper, then thin wood, then thicker wood, then sheet rock, and finally brick or cement. With each increase in wall density, reflections will cause cancellations within the room at ever-lower frequencies as the walls become massive enough to reflect the waves.
Therefore, it is reflections that cause acoustic interference, standing waves, and resonances, and those are what reduce the level of low frequencies that are produced in a room. When the reflections are reduced by applying bass traps, the frequency response within the room improves. And if all reflections were able to be removed, the response would be exactly as flat as if the walls did not exist at all
边栏：大波浪，小房间
有一个普遍的误解是，小房间无法重现低频，因为它们不够大，无法正常“发展”波。 虽然低频确实具有很长的波长——例如，30 Hz 的波接近 38 英尺长——但没有物理原因不能在比这小得多的房间内存在这种长波。 定义房间尺寸的是墙壁间距和地板到天花板的高度。 房间内产生的声波要么穿过房间边界，从边界反弹，要么被吸收。 事实上，这三个通常都适用。 也就是说，当声波撞击墙壁时，它的一些能量可能会被反射，一些可能会被吸收，还有一些可能会通过到外面。
当房间中的低频衰减时，原因总是消除反射。 让低频波正常发声并具有均匀的频率响应所需要做的就是消除或至少减少反射。 一个流行的论点是，低频需要存在足够低以“支持”给定频率的房间模式。 然而，模式对于波的存在不是必需的。 作为证明，任何低频都可以在户外产生——当然户外没有房间模式！ 最佳
这是看待这个问题的一个好方法：想象你在户外安装了一个高质量的扬声器，播放一些低频音调，然后在扬声器前面五英尺处测量频率响应。 在这种情况下，室外测得的频率响应将与扬声器一样平坦。 现在用非常薄的纸在一个小区域（例如 10x10x10 英尺）上砌墙，然后再次测量响应。 低频仍然存在于这个“房间”中，因为薄纸在低频下是透明的，它们可以直接通过。 现在，用厚纸逐渐加重墙壁，然后是薄木头，然后是厚木头，然后是石板，最后是砖或水泥。 随着墙壁密度的每次增加，反射将导致房间内以越来越低的频率消除，因为墙壁变得足够大以反射波。
因此，反射会导致声学干扰、驻波和共振，而这些正是降低房间中产生的低频水平的原因。 当通过应用低音陷阱减少反射时，房间内的频率响应会得到改善。 如果能够消除所有反射，则响应将完全像墙壁根本不存在一样平坦 |
|
发表于 2022-5-6 10:45
楼主
![1K8S6CEHH]%IQ87W`X@DRBE.png](data/attachment/forum/202205/06/111617n0zf0itxgfzuaw6f.png "1K8S6CEHH]%IQ87W`X@DRBE.png")
![FZN[I48}]{GWN1@5}}ZUT$Y.png](data/attachment/forum/202205/06/193643s5wunu9uj5ht66o1.png "FZN[I48}]{GWN1@5}}ZUT$Y.png")
