Fitting an underseat subwoofer, is generally the same process as fitting an regular subwoofer system with an standalone car amplifier. You have your constant 12 volt power, to ensure its getting its voltage, an remote wire, to turn it on and off with the ignition system of the vehicle and also an ground wire. RCA cables are used to feed the car subwoofer an music signal, you will need to use an rca converter if you are using an factory headunit. Some underseat car subwoofers come with an high to low plug that you can directly add speaker wires onto and tap into the rear speakers from your factory radio.
If you're not happy with how your underseat car subwoofers sounds, then they are few different options to make it sound louder. The first thing you want to consider is the gain control. As the gain control increases, so does the volume, but there is also distortion that comes into play. Turn this gain control, slowly turning it up with an bassy song and stop until you hear the speaker making mechanical noises.
The low pass filter is another important setting, but before you tune it, you need to understand what it does. The low pass filter blocks vocals or should we say voice going to the subwoofer, so the subwoofer speaker purely focuses on bass. This makes the car subwoofer play more efficient and louder. For an underseat subwoofer, it will have less potential to play low bass like an 12 or 15 inch car subwoofer, its more of an midbass speaker, So i would suggest, setting up the low pass filter to around 120 HZ. This will give you the most potential out of the underseat subwoofer, as setting it too low can hinder sound as it can only produce so much.
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