作为爱好者应该买多大功率的音箱
Differentwith professional guitarists, hobbyist and advanced learner have a fewer chanceto play at bigger stage .Certainly ,they might play at a smaller venue, or practiceat home . So how many power of amp is good for them?1.
The relationship betweenpowerand loudness
Letus start from discussing relationship between power and loudness. The unit of measure loudness most common is the decibel
(dB), the dB is a unit of measure for sound intensity or level. It is alogarithmic scale developed to express wide ranging quantities on a simplescale. Because it is logarithmic, it can be a little bit confusing. As anexample, a doubling of volume is not equal to twice the number of dB. The chartbelow will help you to better understand the dB and how it relates to what youhear, and what is happening throughout your system as volume levels change. Butfirst, we need to look at the other end of the equation.
Power,
in this discussion, refers to watts. Power defined is the rate at whichenergy is converted or dissipated, as in the case of an amplifier driving aloudspeaker. It is important in our discussion in defining the generalrelationship.
A simple chart will help to understand therelationship of the terms we have introduced: dB ChangeVoltagePowerLoudness 31.4X2X1.23X 62.04.01.52 103.16102 20101004 4010010,00016 Looking at the chart, and starting at the left, wecan see than an increase of 3dB results in a
voltage increase1.4 times the original, a doubling of power, and yields only a subjectiveincrease in loudness only 1.23 times the original. To get a doubling ofloudness, it is important to note that an increase of 10dB is necessary. And toreproduce that volume through our loudspeakers, note that we require
ten times
more power from the amplifier!The chart below is relationship between power withloud 100 watts is 1.23 as loud as 50 watts.
80 watts is 1.1562 as loud as 50 watts.
60 watts is 1.0578 as loud as 50 watts.
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.
Sowe can know
[*]All other things being equal, a 100-watt amp will be just perceptibly louder than a 50-watt amp.It takes about a ten-fold increase in power to double perceived volume.That's right, you'd need a 500-watt amp to be "twice as loud" as your buddy's 50-watt amp.Even more thought-provoking is the fact that a 50-watt amp will only be perceived as a little bit louder than a 15-watt amp driving the same cabinet! [*]All other things are almost never equal.There are so many variables controlling sound pressure level (SPL) and perceived volume that it is quite common for a small amp to sound louder than a much more powerful amp. [*]The initial purchase price of a 100-watt amp will be significantly higher than a 30-watt amp with similar features. [*]It will cost you signficantly more to re-tube a 100-watt amp. [*]If you are driving a 30- or 50-watt amp hard enough to require frequent re-tubing, chances are very good that you will also drive the 100-watt amp hard enough to require frequent re tubing (at significantly higher cost).2.
Does hobbyist need 100w amp?
Below arerelationship between hearing and volume:
50dB-60dB volume ofelectric guitar without power.
70dB-80dB thevolume of watching TV and wood guitar
80-90dB Volume ofsolid guitar amp, this volume don't noise your neighbor on day.
90dB-100dB Thevolume of ROCK ,you can start feeling cool ,although it still need moreheadroom. It is only one fifth of full volume of 30w-50w amp damaging yourhearing. Not face to speaker.
100dB-110dB Thevolume is very cool. half of volume of 50w amp, good headroom, damaged hearingserious .
110dB-120dB It islimit of amp.
Within a few years hearing of player will be permanentlydamaged.
[*]There is absolutely
no
venue that
requires
a larger amp and cabinet than one suitable for use as a stage monitor – provided that the members of the band don't get into a juvenile competition to outdo each other.Need more feedback?Fine, move closer to the amp, for crying out loud!Typically, a really good 30-watt rig with a suitable cab is ample!Depending on the composition of your band and the variety of venues you play, an even smaller rig mic'ed to the PA and then pumped to stage monitors may be even better.
Note that while a good 30-watt rig has ample volume you may end up having to buy a more powerful rig to get other desired features. [*]At a small venue, a 15 to 30 watt amp can be placed behind the band in a traditional position and used without a mic.In this position the rig serves as a monitor for the guitarist and as the primary amplification for the guitar.[*]At a medium venue, the small rig can be placed in front of and facing the guitarist as a monitor, and be mic'ed and run through the band's PA.The band's PA speakers are placed along the front of the stage and facing out.This arrangement allows the sound to be balanced at the mixer and allows the band to flood a medium to large venue without damaging their hearing.[*]At a large to giant venue, that same small rig can be arranged much as described above but now the band's mixer feeds the house PA.This is the only way to reach the back of the room without dangerous SPLs near the stage at a large venue and
would be required no matter how powerful a rig the guitarist has. [*]Smaller equipment takes up less space on cramped stages. [*]The money you save by purchasing a smaller amp can fund a nice power conditioner to protect your equipment and clean up power line noise – the conditioner will cost less too since now you don't need one that will handle a billion watts. [*]If the band members will agree not to compete,
all
of them can recognize significant savings by not having to purchase unnecessary equipment. [*]Your band is far more likely to be called back for a repeat engagement if you provide a well-balanced, easily managed performance than if you are just obnoxiously and uncontrollably loud. [*]Many guitarists already have the monster amp – it isn't necessary to get rid of it.You can use an attenuator (see the attenuator myth) and perhaps a smaller cab.3.
How about amp which power is within 10w?
Itdepend on whatsound you want. If you like clean sound, No problem, one 5w combowhich has smaller speaker is good for you.But if you want distortion sound(manypeople want it). It is different.
Thereare fours components in total guitar amp syetem.
#1 preamp tube distortion( which let soundhard ,more metal), #2 power tube distortion( which let sound warm ) #3 speakerdistortion ( I like regard it as No-Line of speaker)#4 the physical movement ofair that your speakers produce at high volumes.
When the power of amp issmaller such as 5w.It is difficult to obtain more distortion from power tube. At same time, because the capacity of power tube issmaller, the distortion of preamp is limited . The power push coil of speakeris too smaller . The response of speaker will became bad.
4.
What is the best combination of amp for hobbyists ?
Wehave discussed 100w and 5w guitar amp , know disadvantages of two kind of amp.
What is good choice for hobbyist?
One amp, which power is within 50w , is good selection.At same time combination 50w amp with one attenuator will help you more. 我表示看不懂。
回复 1楼 kldguitar 的帖子
大致看了下，写的是吉他爱好者如何选择合适瓦数箱子首先陈述了一个观点，箱子的声音提高一倍，瓦数得增加10倍，5w箱子音量是50w的一半，30w的声音是50w箱子的86%，100w箱子音量是50w的1.23倍所以，你买30w的箱子跟50w的箱子音量差不多，音量不能按瓦数来评判。然后说50-60分贝是木琴的音量范围，70-80分贝是你看电视正常音量 80-90分贝应该指你电琴的清音，不扰民的情况下，90-100分贝你才能感觉什么是rock，30-50w箱子五分之一的音量，但是你需要更大的空间，不能把耳朵贴在音箱上，100以上就是50w箱子一半的音量，但长期处于这种环境有损听力
再下面是关于不同瓦数的箱子的表现及优缺点，小瓦数的可能要另加麦克风拾音进PA， 大瓦数直接开音量就可以，没仔细看，谁有兴趣可以详细翻译一下
最后就是重点了，关于如何选不同瓦数的箱子，文章认为如果你玩清音的话，那么10w以内的箱子挺不错的，但是你要玩重失真，那小瓦数箱子不适合，因为小瓦数箱子产生的失真不够。对于一般爱好者，50w以内的箱子是个不错选择，同时，50w，或50w以上的箱子加个衰减器也不错 我日。。headroom这个词理解错了。。谁具体再补充下，纠正下 有个国产效果器的视频里说了headroom，但是使用声音来体现的好像用语言比较难解释 金属党
仍然选起码50W的，无经济压力就100
回复 3楼 skyrangerlc 的帖子
很不错的理解，实际已经不用再翻译了，要言不繁。 HEADROOM是动态余量，指最大音量而不产生失真的动态范围。 LZ最近常发这样的帖子，可能的话尽量先翻译了吧，起码简单说一下，虽然本人基本还能看懂。回复 10楼 胜子 的帖子
原来是这样啊 我倒是觉得有必要买个分贝仪，弹琴的时候放在自己耳边检测下当时分贝是否超90回复 13楼 rocklover_2000 的帖子
超过90是随随便便的事。 原帖由 胜子 于 2012-10-30 12:38 发表超过90是随随便便的事。
好吧。。那末就接受现实，好在我不大有时间弹琴。。。。 实际上对大箱子的喜爱不能单从声音的角度来理解，比如presence 实际并不是调节可听声域的声音，更多的是来自于强烈震动引起的身体感受。 然而，声场受周围环境影响是比较大的，在一个空间有限的环境里，你不太可能得到真实的剧院的效果，但那时专业艺术家的事，作为爱好者又何比去追求呢。
回复 11楼 胜子 的帖子
国内有很多以讹传讹的东西，所以，最好还是介绍一些国外原版正确的东西给大家看，原滋原味，另外，目前，英语水平高的人很多，至少我们公司，我的英语就不如年青人，看看原文难度不大，也是提高。回复 17楼 kldguitar 的帖子
我想说presence我能听得到，LZ是已经年纪大到听不到这个频段的声音了？ 自己玩我选50W 听不到presence? .......即使你50岁也能听到12000hz的吉他的主要EQ区域中比较亮的音色也都是3-5khz（和人声打架的区域） 5-8khz (空气感）
9khz往上都是fizz而已
另外 没人说你非得在家把120瓦开到头 有个东西叫衰减器
除非是跟自己还是跟邻居过不去
比如某某被人拉电闸的版主
至于音色取向问题玩重的最好是能有多大瓦数就来多大瓦数
小瓦数箱子永远也搞不出120瓦150瓦箱头的low mid balls and punch
追求金属的话就别多想了 一步到位吧 120/150+212/412 预备一个衰减器的预算 https://s-media-cache-ak0.pinimg.com/564x/c2/61/f2/c261f22fe205ac1801aeebcbddfe79ca.jpg 15瓦玩过，金属疲软不刚正，中频偏多，但是弹清音比较好听，50瓦6L6后级管的比较适合干金属
另外15W的肯定不会小声，想小声还是买5瓦并且可以调成1瓦的吧
卧槽 上古老坟 不过没看过 还是学习一下
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