Sorry folks, there are no subwoofers on the X3. There are "woofers" that with the logic 7 system that are capable of reproducing sound below 30Hz. In fact the lower frequency spectrum measures higher dB's than the middle and upper frequencies. It is an inverse curve, not a flat curve. "Sub" means; below, beneath, under. So a true subwoofer would play under 30Hz.
If you want better bass, try adding a speaker level converter inline with the woofer wires, add an amp for only the woofers with a bias setting. Make sure the amp is at least 150+ watts. If the speaker box is a sealed box add acoustic stuffing or even replace the woofers with some from Earthquake sound.
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