Ideal Power Amplifier Wattage Rating for Powering My Loudspeakers
As rules of thumb (applicable to all Class D, A, B, AB, AB+D, AB+H, G, T amplifiers in the market), the best answer is found using what is commonly called the loudspeaker’s RMS power rating. Use an amplifier that is twice the RMS rating. If you can’t find an amplifier with that exact rating, multiply this power rating by 0.8 and also by 1.25 to find a range of acceptable power (due to variables in efficiency, power factor, damping factor, and signal crest factor).
Example: A loudspeaker has a 1000W RMS rating. Twice of this is 2000W. Therefore the acceptable range for the power amplifier to use is from 1600W (0.8 x 2000W) to 2500W (1.25 x 2000W). Anything larger is potentially excessive power. Anything smaller can cause damage from the amplifier clipping. Remember that the power amplifier output you select must be rated for the nominal impedance of the loudspeaker (i.e., 16, 8, 4 or 2Ω).
Note: All GECKO® amplifiers come equipped with the extremely efficient C.R.I.S.T.A.L.® technologies, hence the rule-of-thumb mentioned above may not apply under most operating circumstances. Example: One could drive a pair of GECKO® REVELATION SR 615RF 15" loudspeakers rated at 700W RMS 8Ω using a unit of GECKO® EXODUS ATOM MXR 1208A active C.R.I.S.T.A.L.® Audiophile Class-H mixing console with built-in power amplifier rating of 250W at 8Ω per channel. Suppose we follow the rule of thumb, the conventional power amplifier rating required to drive a single 700W RMS 8Ω speaker should range between 1120W (0.8 x 1400W) to 1750W (1.25 x 1400W) at 8Ω.