whats it called/advice

[nitroracer20]

hi,

Im looking to get a little extra bang in my mazda 3. I was looking into a bass tube, however, I have heard they are a thing of the past. Im not really gung ho about building up a box etc, as space in the trunk is limited as is. A friend recommended alpine seat drivers, however I cannot find them or anything similar. He stated they go under your seats and give a great effect. Anyone have advice or info?

Thanks,

DOn

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