E

EQ (Equalization)
Frequency-dependent level adjustment. Parametric EQ: adjust center frequency, gain (±dB), and Q (bandwidth). Graphic EQ: fixed frequencies. Use to correct room/cabin resonances. Prefer cuts over boosts. → See also: Parametric EQ, Q Factor
Chapter 4.5

Excursion (Xmax)
Maximum linear cone travel (one direction) before distortion increases significantly. Measured in millimeters. Typical: 10-15 mm (music subs), 20-40 mm (competition). More Xmax = more output at low frequencies. → See also: Thiele-Small, SPL
Chapter 10.1