Do Woofers Need Crossover?

Every audio system, including the one in your car, needs a crossover to direct sound to the correct driver. Tweeters, woofers and subs should get high, mid and low frequencies respectively. Every full-range speaker has a crossover network inside.

Does a single speaker need a crossover?

The absence of a crossover will mean that the phase response of a single driver speaker is more linear than a (passive) multi-way speaker. The absence of a crossover will mean that a single-driver speaker will tend to have a smoother polar response than a multi-way (non-coaxial) speaker.

Can I use speaker without crossover?

A loudspeaker system without a properly designed crossover (or none at all) can cause too much frequency overlap between drivers which can increase distortion and degrade overall sound quality.