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[音箱知识] 电子管功放电功率和音量对应表

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发表于 2011-3-1 16:32:31 | 显示全部楼层 |阅读模式
吉他中国微信公众号
买了电子管功放的玩家,可能一直苦于音量太大不能在家里玩,用VVR,powerscaling以及衰减器又不清楚调到什么功率音量达到什么程度。 这个问题实际也困扰我们,终于找到一个对应的数据。贴出来供大家参考。它以50瓦音箱作为一个对比。根据如下公式计算
X% louder = 2^log10(P2/P1) * 100%
如果懒得一个个算,可以看下面计算。
40 watts is 94% as loud as 50 watts.
30 watts is 86% as loud as 50 watts.
25 watts is 81% as loud as 50 watts.
22 watts is 78% as loud as 50 watts.
20 watts is 76% as loud as 50 watts.
18 watts is 74% as loud as 50 watts.
15 watts is 70% as loud as 50 watts.
12 watts is 65% as loud as 50 watts.
10 watts is 62% as loud as 50 watts.
9 watts is 60% as loud as 50 watts.
8 watts is 56% as loud as 50 watts.
7 watts is 55% as loud as 50 watts.
6 watts is 53% as loud as 50 watts.
5 watts is 50% as loud as 50 watts.
4 watts is 47% as loud as 50 watts.
3 watts is 43% as loud as 50 watts.
2 watts is 38% as loud as 50 watts.
1 watt is 31% as loud as 50 watts.
3/4 watt is 28% as loud as 50 watts.
1/2 watt is 25% as loud as 50 watts.
1/4 watt is 20% as loud as 50 watts.
1/10 watt is 15% as loud as 50 watts.
50mW is 13% as loud as 50 watts
20mW is 10% as loud as 50 watts.
10mW is 8% as loud as 50 watts.
5mW is 6% as loud as 50 watts.
1mW is 4% as loud as 50 watts.
0.5mW is 3% as loud as 50 watts.
0.1mW is 2% as loud as 50 watts.
50uW is 1.6% as loud as 50 watts.
10uW is 1% as loud as 50 watts.

其它瓦数之间的换算可以用相对值
如20瓦的功放,衰减到2瓦,那么音量是原来的50%。衰减到1瓦只有20瓦的40%。
发表于 2011-3-1 17:15:24 | 显示全部楼层
吉他中国抖音
公式好复杂,没有直接的感觉
发表于 2011-3-1 17:25:26 | 显示全部楼层
GC视频号
就是说不要以为30W的比15W的音量大一倍。150W的才比15W的音量大一倍。
以前看过一个帖子里面有人说过这个问题
发表于 2011-3-1 18:34:48 | 显示全部楼层
买琴买鼓,就找魔菇
这个知道  音量每大一倍 增大 3DB
 楼主| 发表于 2011-3-1 19:13:25 | 显示全部楼层

不用看公式

原帖由 斯巴达克 于 2011-3-1 17:15 发表
公式好复杂,没有直接的感觉

不用看公式。只要看对应表就可以了。
原文作者认为只有1/8w 的功放才能在家里用,这明显有点小了,同时各家的功放,用的喇叭不同,音量也会不同,但相对值是成立的。
发表于 2011-3-1 21:18:49 | 显示全部楼层
 楼主| 发表于 2016-5-26 17:58:15 | 显示全部楼层
 楼主| 发表于 2016-12-4 12:24:50 | 显示全部楼层
 楼主| 发表于 2017-2-26 22:53:32 | 显示全部楼层
 楼主| 发表于 2017-6-26 20:32:06 | 显示全部楼层
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