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For those of us who like to listen to recorded music and movie soundtracks, high-performance speakers are a window into the immersive audio experience. People with normal hearing can perceive frequencies of up to 10 octaves from about 20Hz to 20kHz. But most so-called "full frequency" speakers can't actually reproduce the whole range. They perform well at intermediate and high frequencies and require less power and air flow to reproduce, but they usually perform poorly at lower frequencies, often referred to as "bass".

Why do speakers struggle at low frequencies

The lower the frequency, the larger the speaker driver must be, and the greater the amplifier power required to play at a reasonable level. Many larger floor speakers can reach about 30Hz, while smaller Bookshelf Speakers cannot be lower than 50Hz or even higher. At the bottom of their range, the output of these speakers begins to decline, depriving you of what the artist or director wants you to hear (or feel). Don't worry, we're talking about subwoofers.

Even if your speakers can reproduce sounds as low as 30Hz, there is usually a lot of sound information at frequencies below 30Hz, especially in movie soundtracks and many music types. For example, EDM synthesizer bass can easily reach 20Hz, while Saint Saens Symphony No. 3 includes organ timbres as low as 16Hz. Then there will be explosive and heart beating mood change effects in many films, which can easily reduce the depth to 20Hz and below.

In addition, due to the way the human auditory system works, these ultra-low frequencies need to be louder than the rest of the spectrum to balance the sound - we are less sensitive to low frequencies than intermediate and high frequencies. However, full frequency speakers begin to disappear at the very low end of their range.

Perhaps most importantly, effortless, accurate bass does increase the influence of music and movies. Who doesn't like the deafening bass line and the explosion that shocks your seat? Most speakers simply cannot provide the ultimate satisfaction from a large number of low-frequency outputs. So how do you get amazing depth and powerful audio experience? You get a subwoofer.

What is a subwoofer? It is a speaker specially designed to reproduce only low frequencies (also known as bass). In addition, most consumer subwoofers are active, which means they have their own internal power amplifier. This allows the main amplifier to focus on the main speaker, which requires less power than the subwoofer.

为什么扬声器会在低频下挣扎

添加一个（或两个）这些专业扬声器可能是您可以对家庭音频系统进行的最具变革性的升级。当您添加一个或多个低音炮时，它们会填补从主扬声器频率范围底部一直下降到 20Hz 甚至更低，低于人类听觉阈值的间隙。当你感觉像那样的低音时，它会让电影和音乐更加刺激和身临其境。

低频的感觉比听到的要多，它们传达了任何其他扬声器通道都无法复制的明显音频体验。也被称为“次声低音”，低于 20Hz 的低频有时会令人惊叹，有时会令人不安。购买低音炮时，您应该确保它可以达到接近或低于 20Hz（就像每个 SVS 型号一样），以充分利用您的音频体验。

低音炮和扬声器应该形成从最高的高音到最深的低音的无缝且有凝聚力的音频体验。低音炮范围的上部（50-130Hz）通常与主扬声器的低端重叠，增加其范围底部的输出，并使扬声器更多地集中在他们舒适的地方：中频和高频。