挑选音箱注意什么
，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。
Note what the first speaker selection, pay attention to whether the uniform sound
speaker output, as the main source of multimedia music and general music-based game is so large proportion of which treble, bass was small. Second,
we must pay attention to acoustic positioning capability. Speaker positioning
capabilities have a direct relationship to the user to play games, watch DVD
movie spot effect. Third, the speaker should be noted that the dynamic
amplification limit the frequency domain, that is when users open a large
volume of the speakers, and beyond a certain limit, the speaker is also another
area to maintain uniformity in the whole tone of the sound source, a clear
signal amplification capability. Fourth, we must pay special attention to
whether the speaker cabinet resonance. General box or plastic shell thin
speakers below the 200Hz low frequency output at high volume, resonance
phenomena occur. There will be serious impact on the output tank resonant
sound quality, so users should try to select in the selection of wooden
case speaker speaker. Fifth, we should pay attention to whether the anti-magnetic nature of the chassis. As the display is very sensitive to the
surrounding magnetic field, the magnetic field if the speaker larger image
on the screen will be affected, or even decline in life expectancy led to the
display, so extra care when selecting. Sixth, pay attention to an enclosed
speaker cabinet. Because of the better speakers in an enclosed, the output
quality, the better. Leak detection method is simple, the user can hand down
on the speakers with holes, if we feel there is clear or smoke into the air
out of the phenomenon, it shows good performance of speakers closed. SNR of
the amplifier output signal voltage while the output noise voltage ratio.
Namely the amplifier signal to noise ratio, referred to as letter-noise ratio. English characters are usually S / N to indicate that its
unit of measurement in decibels (dB). Higher signal to noise ratio, then
mixed with the noise signal in the smaller, higher quality sound. On the
contrary, the worse the playback quality. SNR is the multimedia speakers in
an important indicator, only the letter of the noise high, clear sound
reproduction is possible, clean and level, multimedia speakers, the amplifier
signal to noise ratio required at least more than 70Db, preferably greater
than 80dB . General Hi-Fi amplifier signal to noise ratio requirement is greater than or equal to 90dB.
Speaker frequency response range of the frequency response range is the speaker
in the audio signal playback, the rated power state changes in the context of
the specified range, the frequency response can replay the audio signal width.
In theory, the speaker's frequency response range should be as widely as possible,
at least in the range of 18HZ-20KHZ.
