LCR filter: Many novice friends are not familiar with traps. Let me introduce it first: 1. Why use LCR correction network trap? The flatness of the frequency response curve is one of the most important and direct indicators affecting the correctness of the sound. The function of the trap LCR network is to balance the local of the mid-frequency or mid-high frequency of the speaker frequency response curve, maintain a reasonable flatness, and keep the sound at a better level. In terms of specific listening experience, it attenuates the of the mid-high frequency part, and the overall tone is more balanced. Special note that the trap is to fine-tune the tone. The higher the level of the matching equipment, the more the difference can be reflected. It may not be obvious on programs with ordinary sound quality and low-end amplifiers. Is the trap filter necessary? Not necessary. It attenuates the treble. Friends who like brighter treble do not need the trap filter. Friends who are not demanding can choose not to use the trap filter. In fact, based on cost and technical level considerations, traditional mid-to-low-end full-range speakers do not have this design. We have tested that good speakers with trap filters can improve the sound effect to a higher level. Is the trap correction network a crossover? Many friends think that the addition of a full-range speaker unit is a crossover. Rigorous manufacturers add an external network just to change the parameters in a good direction to obtain the correct sound. As for the crossover, its core is division. The LCR correction network is connected in series in the circuit, and there is no extra speaker. There is to divide, so it is not a crossover. Is this filter suitable for speakers? Strictly speaking, the filter should be determined after debugging based on the effectof the speaker after packaging. When we designed it, we took into account the situation of most friends. This filter is suitable for 3.5-5 liter bookshelf speakers. If you try to install floor-standing speakers, various components may be adjusted. Are there any examples of full-range speaker units of major using correction networks? A well-made full-range speaker have such a design. For SEAS full-range speaker units, For AURA, For full-range speakers, and For , For , For , For , For full-range speaker units, etc., DIY and other models all have officially designed wave traps, which can be searched for specific situations. There are also examples of friends designing wave traps for mid- and low-end Feilo and other full-range speakers. Can 's filter be used for other speakers? Basically, most of them can match the 6.5-inch full-range speakers on the market, but because the parameters of different speakers are different, it is impossible to answer your specific suitable speakers. Of course, experienced friends can adapt other speakers by adjusting the parameters and play different tricks. You are welcome to improve on our basis to better suit your taste. Capacitance:6.8uF+4.7uF (adjustable) Applicable impedance:4-8 Applicable speakers:full-range speakers below 6.5 inches Due to different batches,there may be differences in product appearance,color,and printed text,which not affect the use. Colour:Random Color(Color is random, no specification is accepted) Material:PCB Package Contents: 1 * Adjustable LCR 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.