Sound Pressure Level (dB) - Sound pressure level, SPL, is the deviation from atmospheric pressure caused by the sound wave expressed in decibels.
Max Input (W) - Maximum power that can be used for a very short period of time without permanently damaging the speaker.
Nominal Input (W) - The nominal input wattage is the amount of power the speaker can safely handle during long-term use.
Impedance (Ohm) - Electrical impedance is the ratio of applied voltage to current. It is important to match the speaker impedance to the system impedance.
Resonant Frequency (Hz) - It is the frequency at which the cone begins to vibrate.
Size (mm) - Frequency range is determined but the size of the speaker. Smaller speakers will operate in higher frequencies, while larger speakers operate in lower frequency ranges. Low frequencies are used for deep bass sounds while mid-range frequencies are used for voice reproductions.