Car active subwoofer

The section where the speakers are fixed . Its outer diameter must be consistent with the inner diameter of the paper tube to facilitate the fixation of the speaker.
Open a wiring trough on its outer circle, fix the speaker on the wood, brush the cavity on the wood, and fix it in the center of the conduit. The speakers
use two 8t 16.5-inch bass in anti-phase parallel connection. The power amplifier adopts TDA2005M and is connected in BTI-form, as shown in Figure 9-47. This
is a circuit form that can provide larger output audio power for car power supplies. Although its output power is somewhat insufficient for a subwoofer,
in actual use, the effect is quite satisfactory. 6 When
    using, place the subwoofer Under the back seat of the car, the bass signal can be picked up directly from the speaker . Be careful not to connect the wrong phase.
If this subwoofer can be equipped with a subwoofer amplifier of more than 50w and used in a home theater system, the effect will be better.