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倒相箱扬声器系统的低频特性与几个易于测量的系统参数直接相关。这一系统相当于四阶高通滤波器(每倍频程24dB截止),并可由调整参数值得到各种响应特性。箱损耗对系统特性具有不可忽视的影响。系统效率与频率响应、内损耗和箱子的大小有定量关系。功率能力与频率响应、扬声器单元能推动的最大空气体积V_D有定量关系。倒箱孔面积要足够大,防止出现气流噪声和过大的损耗,该面积与助声箱谐振频率f_B及V_D有定量关系。通过电学测量等简单手段可算出系统参数。倒相箱系统与封闭箱系统相比有两个优点。在系统分析的基础上,可进行为配合某一特定扬声器单元的助声箱的最佳设计,也可从系统指标出发进行包括单元和助声箱的整个系统的设计。在附录中介绍了四阶滤波器函数和倒相箱系统的频响函数以及助声箱损耗的测量方法。
The low frequency characteristics of the inverted box loudspeaker system are directly related to several system parameters that are easy to measure. This system is equivalent to a fourth-order high-pass filter (24dB cutoff per octave), and can be adjusted by a variety of parameters to get the response characteristics. Box loss has a non-negligible effect on system characteristics. System efficiency and frequency response, internal loss and the size of the box have a quantitative relationship. Power capacity and frequency response, the speaker unit can promote the maximum air volume V_D quantitative relationship. Orifice hole area should be large enough to prevent airflow noise and excessive loss, the area and the auxiliary resonator resonant frequency f_B and V_D have a quantitative relationship. System parameters can be calculated by simple means such as electrical measurement. Inverted box systems have two advantages over closed box systems. Based on the system analysis, the optimum design of the anacoustic box for a particular loudspeaker unit can be carried out. The entire system including the unit and the auxiliary sound box can also be designed from the system specifications. In the appendix, the frequency response function of the fourth-order filter function and the inverter box system and the method of measuring the auxiliary box loss are introduced.