电子管功放电功率和音量对应表
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%。 公式好复杂，没有直接的感觉 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 这个知道音量每大一倍 增大 3DB
不用看公式
原帖由 斯巴达克 于 2011-3-1 17:15 发表 http://bbs.guitarschina.com/images/common/back.gif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。
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