1W/1M - Refers to the sensitivity of the driver as measured in SPL measured 1 Meter away with 1 W of power going to the driver.

2.83V/1M - Refers to the sensitivity of the driver as measured in SPL measured 1 Meter away with 2.83 V of power going to the driver.

Basket - The main structure of the driver. Commonly made of metal or plastic.

Cas - Acoustic compliance of the driver.

Cab - Acoustic compliance of the enclosure.

F3 - Negative 3 half-power frequency.

Fb - The frequency that a ported box is tuned to.

Fc - Frequency a sealed enclosure is tuned to.

Fs - Resonance frequency of the driver.

Pe - Maximum amount of power you can give a driver before damaging it.

Q - When wired in parallel, Q is the ratio of resistance to reactance and when wired in seried, Q is the ratio of reactance to resistance.

Qes - Electrical Q.

Ql - The Q of an enclosure taking leaks into account.

Qms - The mechanical Q of a driver

Qtc - Sum of mechanical and electrical Q for a driver at Fc.

Qts - Sum of mechanical and electrical Q for a driver.

Sd - Total surface area of the driver cone.

Vas - Volume of air that has the same compliance as the driver.

Vab - Volume of air that has the same compliance as the enclosure.

Vb - Total internal volume of an enclosure.

Vd - Maximum displacement of the driver cone.