低音炮在济南音响系统中得到广泛的应用，其中的原因在于影片音频解码还原过程中获得了一个超重低音信号，不论在模拟杜比系统还是现今非常流行的数字环绕系统中，既然有超重低音信号，必然就需要专门的音箱来重放。
The subwoofer is widely used in sound system in Ji'nan, one of the reasons is the film's audio decoding obtained a bass signal reduction process, whether in the simulation system around the Dolby system is nowadays very popular figures, since there is a bass signal, necessarily requires special speakers to replay.
就低音炮电路构成来分析，一般由前级放大、低通滤波、相位调整、功率放大、保护以及电源等部分组成，就其作用来说，前级放大就是将AV功放输出的超重低音信号进一步放大到足以驱动功率放大部分满功率输出的幅度，因为各个牌号的AV功放提供的超重低音信号电压不一样，一般从0.3-1伏不等，所以前级放大还是必要的，前级电路还有一个重要的作用就是起隔离缓冲的意义，因为各个牌号的功放输出的超重低音信号存在差异，有的厂家在设计上偷料，致使其输出内阻很高，如果直接驱动低音炮的功率放大单元，有可能效果非常不好；低通滤波是低音炮内电路部分一个比较重要的单元，它的作用就是将混杂在功放输出的超重低音信号中的低频以上的信号进一步滤除，一般设计将80-180Hz(很多高档产品将滤波器低端截止频率设计成连续可调的)，如果属于固定频率的滤波器，一般取值大约在110-150Hz左右，过低音箱容易产生混降声，过高，容易混入人耳可辨的音乐信号;用于各个牌号的AV功放输出的超重低音信号是反相还是正相没有统一规定，因而，相位调整就是在低音炮摆放时根据系统连接的需要将低音炮正相或反相使用，视效果而定，一般也必不可少；功率放大单元就不用罗嗦了，是有源低音炮的核心所在了，同样，为保护济南音响安全工作并在异常时保护器材不被损坏贵重部件或将故障扩大化，保护电路一般也是必要的；电源是各个电路单元工作的动力，是基本组成部分。需要补充的是，近来一些低音炮还设计了电源自动控制功能，使低音炮在无信号时自动关闭低音炮的主电源。

Subwoofer circuit composition, generally by the former stage amplifier, a low-pass filter, phase adjustment, power amplifier, protection and power components, such as in terms of its role, former stage amplifier is the AV power amplifier output to mega bass signal amplified enough to drive the power amplifier part of the full range of power output, because each brand of AV amplifiers provide mega bass signal voltage is different, generally range from 0.3 to 1 v, so the former stage amplifier is necessary, the front-end circuit still has an important significance of the role of the isolation buffer, because each type of power amplifier output mega bass signal differences, some manufacturer in design steal material, causes the output resistance is very high, if direct drive subwoofer power amplifier unit, likely effect is very bad; Low pass filter is within the subwoofer circuit part of one of the more important element, its role is to blending in mega bass power amplifier output signal more than in the low frequency signal further filtering, general design will be 80-80 hz (a lot of high grade product to filter the low cutoff frequency design into continuous adjustable), if belong to the fixed frequency filter, generally value around 110-150 hz, low speakers easily produce mixed sound, too high, easily mixed with ear discernible music signal; Mega bass for each type of AV amplifier output signal is reversed phase or is not uniform, therefore, phase adjustment is the subwoofer placed according to the needs of system connection will subwoofer positive phase or reverse use, depending on the results, the general is essential; Power amplifier unit need not wordy, is the core of the active subwoofer, likewise, working for jinan sound safety and protect equipment from damage valuable parts when abnormal or fault, failure protection circuit general is necessary; Power is the power of each circuit unit work, is a basic component. Need to add that some recent subwoofer also designs the power automatic control function, the subwoofer automatically shut down when no signal subwoofer's main power supply.

本文提供一种设计比较完善的超重低音前级信号处理部分电路，其中第一级为信号放大，根据需要可调整本级放大倍数，第二级为50Hz以下超重低音的提升电路，这是一般低音炮电路所没有的，第三级为频率可调低通滤波器，调整范围为80Hz-200Hz，第四级为隔离缓冲级，第五级为0-180度相位连续调整电路.这也是一般低音炮所没有的功能单元，很有特色，最后一级也属于隔离缓冲级，最后面为音量调整电位器。制作方而、其三块双运放可采用一般4558即可，供电电源为稳压电源±12-18V，由于电流很小，可由功率放大级电源经电阻降压取得，以简化设计制作难度。对此电路感兴趣者，可以根据需要予以适当的删减。

This paper provides a design of bass sound level signal processing circuit, wherein the first stage is signal amplification, according to the need to adjust the magnification, improve the circuit second level is below 50Hz bass, this is not the general subwoofer circuit, the third level for the frequency tunable low pass filter, adjusting range for 80Hz-200Hz, fourth for grade fifth level isolation buffer, continuous adjustment circuit 0-180 degree phase. This is generally not the subwoofer function unit, very unique, the last stage also belongs to the isolation buffer, the back of the volume potentiometer. Third, the producers and the general block dual 4558, power supply for power supply + 12-18V, because the current is very small, can be obtained by the power from the power amplifying resistor step-down, to simplify the design difficulty. This circuit is interested in, can according to need to be properly cut.

至于功率放大以及保护、电源部分电路与一般功放没有什么区别，为节约篇幅略去，不过，用于低音炮工作与超低频段，就功放而言非常消耗功率，要求功率放大部分提供足够功率输出，根据音箱的效率，一般要求输出功率要大于80W,同样，电源功率储备足够也是必要的，否则，在大动态时功放输出的失真加大且输出功率受到制约，而影响低音炮的效果，至于分立元件还是用功率集成块，应该都是可以的、有一点是毫无疑问的，对于低音炮来说，变压器以及功率放大的输出功率越大越好。

As for the power amplifier and power circuit protection, not what the difference with the general power amplifier, in order to save space spent, however, for subwoofer work with ultra low frequency power amplifier, it is power consumption requirements, power amplifier provides sufficient power output efficiency, according to the general requirements of the sound boxes, the output power is greater than 80W, the same, reserve enough power is necessary, otherwise, in large dynamic distortion power output increase and output power is restricted, and affect the subwoofer effect, as discrete components or integrated power block, should all be possible, there is no doubt, for subwoofer, transformer and output power the bigger the better power amplifier.

需要补充说明的是，济南音响制作看似简单，但要做出效果、听感出色的音箱还真不是件容易的事。在业余条件下更是比较困难，如果厂家提供的单元参数比较规范且提供了参考箱体设计指南，那在业余条件下制作音箱相对容易些，低音炮更是如此。当然，这并不影响一些资深音响人士凭着一股精神，经过反复试验、调试以及惊人的听力制作出效果出众的音箱。

What's more, the Ji'nan sound making seemingly simple, but to make the effect, the sense of hearing good speakers really is not an easy thing. In the amateur conditions is more difficult, if the unit parameters provided by the manufacturer specification and provides a reference guide for the design of the box, in the condition of making amateur speakers relatively easy, subwoofer is even more so. Of course, this does not affect the number of senior audio people with a spirit, after repeated testing, debugging and amazing listening to produce the effect of outstanding speakers.

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