推荐回答（3个）
做个业余小音箱不是很难,只要有合适的木板,然后裁好,挖好洞,再把扬声器固定上去,把箱子粘好就行了.如果对音质有要求的话,就要稍微考虑箱体的类型,尺寸(长宽高的比例,容积)等问题了.
主要要解决的是功放的问题.
对于小功率扬声器,功放的阻抗匹配不是很严格的.一般的小功率功放,接4~16Ω的扬声器都能正常工作.
至于自制功放,我认为不是很难,也不会很贵,而且质量有保障.
到市场上配一个4Ω3W的功放却是很难的.
市场上卖的功放板少说都有10W.(不过10W的功放带那两个扬声器一般没问题)
如果你有电子制作基础,愿意自己做功放的话,可以给你一些参考资料.
带3W的扬声器就用TEA2025做功放.
它在12V供电的情况下,可以输出3W×2的功率.并且信噪比较高.
这个功放我做过,如果扬声器的口径够大的话(4英寸),声音还是不错的.
我是用4.5英寸的泡沫边全频扬声器做音箱的,用TEA2025功放带,效果还行,声音响亮,安静的环境下,100平米的房子可以听得清音乐声.(扬声器口径小的话,效果会差一些.)但是,这个功放还是有明显的缺点的.因为功率只有3W×2,所以低音的力度是出不来的.但是音质比一般的卡式收录机上了很多档次的.
这个功放的印刷电路板图见附图.元件参数都标好了,照做就不会错的.我就是按照这个图做的.
再给你介绍一个功放:TDA2003功放.
在14V供电下能有6~8W的功率,低音明显很好保真度和信噪比等参数都比TEA2025好.但是每一个TDA2003功放芯片只有一个声道的放大,要做双声道的话要两块TDA2003.电路板走线会麻烦些.
如果你的扬声器是纸折环的扬声器的话,就不要做这个功放了,因为小口径的纸折环的扬声器低音不会很好,用这个会浪费很多能量.TDA2003功放我也做过.
如果需要TDA2003的电路图,或者有疑问,可以通过Baidu Hi联系我.
这要看你的喇叭是不是定压式的，一般来说，教室广播喇叭应该是定压式的。
如果是，那么你找一台输出功率大于120瓦的定压功放，比如120瓦的、150瓦的、200瓦的。把所有的喇叭都并联接在功放的对应电压输出上就行了。
如果你的功放输出端写有120伏，就接在定压喇叭上的120伏端子上。如果功放输出电压是其他数值，一定要接喇叭的对应电压端子。
这样就行了。
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