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箱体材料对音箱质量的影响
目前音箱所用的材料主要有塑料箱体与木制箱体之分。材料厚度及质量与音箱成本有直接关系,同时还影响音箱的性能。音箱外壳的材料密度越大,发出声音时箱体所产生的振动就越小,特别是带大功率放大器的有源音箱更是如此,而板材厚度一定程度上是实现超低音效果的有力保障,因此,塑料音箱的低音效果不敢恭维。显然,低档的音响产品肯定是塑壳的。但中档音箱就肯定是木制的吗?回答是否定的。这个档次的音箱既有木制的,也有塑壳仿木制的,只是有些仿制品完全达到了以假乱真的水平。中高档的产品肯定是木制的,但是采用中密度板材,还是多层板材这也对音质有不同影响。即便选用的板材相同,输出功率也相同,不同的设计结构、不同箱体大小,其音质仍可能相差甚远。但是,有些音箱虽采用塑料箱体,也同样出类拔萃,比如CREATIVE的 Sound works音箱,不但采用了塑料外壳,而且体积也不大,第一眼印象没有什么特别之处,但是经过试听比较后,才感觉确实出手不凡,无论是音色,还是音质都已达到专业水平,低音也有很强的震撼力,当然价格也不便宜。
Speaker box material quality of the materials used in the current speaker
mainly plastic box and wooden box pided. Material thickness and quality
and cost are directly related to speakers, but also affect the speaker
performance. Speaker enclosure material density, the sound vibrations
generated when the box smaller, especially with high power amplifier Active
Speaker especially, the thickness to a certain extent to achieve a strong
effect of ultra-low noise protection Therefore, the plastic speaker bass boast. Clearly,
low-end audio products is certainly molded case of. But the mid-range speakers on a wooden sure it? The answer is no. The grade of the
existing wooden sound box, also plastic shell imitation wood, imitation is
fully achieved some level of real ones. Certainly in the high-end wood products, but medium density board, or multi-layer sheet which also have different effects on sound quality. Even if
the board used the same output power are the same, different design structures,
different box sizes, the sound quality may still be very different. However,
some speakers though plastic box, is also outstanding, such as the Sound works
CREATIVE speaker, not only by the plastic shell, and the volume is not large,
the impression at first glance there is nothing special, but after comparing
audition only feeling really extraordinary your opinion, whether sound or sound
quality are up to professional level, bass and that is very shocking, of course,
the price tag.
挑选音箱注意什么
第一,要注意音箱输出的音色是否均匀,由于多媒体音乐的声源主要是以游戏和一般音乐为主,所以其中高音占的比例较大,低音比例较小。
第二,要注意声场的定位能力。音箱定位能力的好坏直接关系到用户玩游戏、看DVD影片的临场效果。
第三,应注意音箱频域动态放大限度,即当用户将音箱的音量开大并超过一定限度时,音箱是否还能再在全音域内保持均匀清晰的声源信号放大能力。 第四,要特别注意音箱箱体是否有谐振。一般箱体较薄或塑料外壳的音箱在200Hz以下的低频段大音量输出时,会发生谐振现象。出现箱体谐振会严重影响输出的音质,所以用户在挑选音箱时应尽量选择木制外壳的音箱。
第五,要注意机箱是否具有防磁性。由于显示器对周围磁场十分敏感,如果音箱的磁场较大会使荧屏上的图像受到影响,甚至导致显示器的寿命下降,因此在挑选时要格外注意。
第六,要注意音箱箱体的密闭性。因为音箱的密闭性越好,输出音质就越好。密闭性检查方法很简单,用户可将手放在音箱的倒相孔外,如果感觉有明显的空气冲出或吸进现象,就说明音箱的密闭性能不错。
信噪比 放大器的输出信号电压与同时输出的噪声电压之比。即为放大器的信号噪声比,简称为信噪声比。通常用英文字符S/N来表示,它的计量单位为分贝(dB)。信噪比越大,则表示混在信号里的噪声越小,音质量就越高。反之,放音质量就越差。信噪比是多媒体音箱中的一个重要指标,只有信噪声高、声音的重放才可能清晰、干净和有层次,多媒体音箱中,放大器的信噪比要求至少大于70Db、最好大于80dB。一般高保真放大器的信噪比要求大于或等于90dB。
频响范围 音箱的频响范围是指该音箱在音频信号重放时,在额定功率状态下并在指定的幅度变化范围内,所能重放音频信号的频响宽度。从理论上讲,音箱的频响范围应该是越宽越好,至少应该是在18HZ-20KHZ的范围。![](http://i03.c.aliimg.com/img/ibank/2011/959/256/298652959_1065434953.jpg )
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