Basket

The metal frame that holds all the components of a subwoofer together. The basket's rigidity and resistance to resonance help determine the sub's sound quality.
The metal frame that holds all the components of a subwoofer together. The basket's rigidity and resistance to resonance help determine the sub's sound quality.

The speaker basket doesn’t fit .

Box Volume

Box volume
This measurement, listed with each component subwoofer, tells you the recommended interior volume in cubic feet that an enclosure should have to get the best performance from the sub. A variation of 10-20 percent is generally acceptable.

A variation of 10-20 percent is generally acceptable for subwoofer box volume

Damping Factor

Damping factor
The ability of an amplifier to control the movement of a subwoofer — the higher the damping factor, the greater the accuracy. Damping factor is calculated by dividing the subwoofer impedance by the output impedance of the amplifier. An amplifier's damping factor will decrease as the sub's impedance decreases — that's why an amp running at 4 ohms will provide tighter bass than at 2 ohms. This spec is not always given for all amplifiers.

An amplifier's damping factor will decrease as the sub's impedance decreases — that's why an amp running at 4 ohms will provide tighter bass than at 2 ohms. This spec is not always given for all amplifiers.