A device that divides weak audio signals into different frequencies, located in front of a power amplifier. After the division, independent power amplifiers are used to amplify each audio frequency band signal and send it to the corresponding speaker unit. Easy to adjust, reducing power loss and interference between speaker units. This reduces signal loss and improves sound quality. But this method requires independent power amplifiers for each circuit, which is costly and has a complex circuit structure. Especially for systems with independent subwoofer, electronic frequency dividers must be used to separate the signal from the subwoofer and send it to the subwoofer amplifier.

DAP-3060III  3 in 6 out Digital Audio Processor

In addition, there is a device called a digital audio processor on the market, which can also perform functions such as equalizer, voltage limiter, frequency divider, and delayer. After the analog signal output by the analog mixer is input to the processor, it is converted into a digital signal by an A-D conversion device, processed and then converted into an analog signal by a D-A converter for transmission to a power amplifier. Due to the use of digital processing, the adjustment is more accurate and the noise figure is lower, In addition to the functions satisfied by independent equalizers, voltage limiters, frequency dividers, and delayers, digital input gain control, phase control, etc. have also been added, making the functions more powerful.