The flatness of a speaker's frequency response curve is one of the most important and direct indicators of accuracy. The function of an network is to balance the localized peaks in the mid- and high-frequency regions of a speaker's frequency response, maintaining a reasonable level of flatness and optimizing the sound quality. Specifically, this attenuates these mid- and high-frequency peaks, resulting in a more balanced overall sound. Adjustable Filter: The frequency and amount of cut can be adjusted, offering a wide range of applications and making it more convenient for DIY enthusiasts. It trims the mid- and high-frequency regions to achieve a flatter overall sound quality. This effectively addresses the issues of overly prominent, piercing, harsh, and unpleasant full-range speakers, resulting in a softer, more enjoyable sound with a prominent tone. Applicable Speakers: Full-range Speakers under 15 inches Impedance: 4 to 8 ohms Due to different batches, there may be differences in product appearance, color, and printed text, which not affect the use. Color: As Shown Material: PCB Package Contents: 1 x Filter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.