Subwoofers are designed to increase the bass frequencies, resulting in a deep, thumping sound. In most cases, they are paired with an amplifier to boost the sound. If you do not have the funds for both components, you can still hook up a subwoofer without an amplifier; it simply involves a little more know-how.
How do I install a subwoofer if I dont have a preamp subwoofer?
If your receiver doesnt have a preamp output, you can treat the subwoofer like another speaker and use speaker wire to connect it to the receivers speaker terminals designated for the front left and right speakers. You would then connect the front left and right speakers to the subwoofers speaker-level terminals.
How do I increase the bass on my speakers?
The larger the speaker box is in relation to the diameter of the speaker, the deeper the bass output will be. Put another way, the smaller the box is in relation to the driver, the less deep the bass output will be. So consider buying a larger box.