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Message: <blockquote data-quote="Shamanraj" data-source="post: 1500857" data-attributes="member: 28579">Well we just wanted the amp for rear. Front speakers can be driven by the 22W*4 (continuous power output) as the "RMS" of the speaker is lower than this. Now a lesson on "RMS".Power is energy per time. It is measured in watts. Power delivered by an amplifier to a load (speaker) is normally determined by dividing the voltage (V) squared by the impedance (Z) :V² Power = ----- Z The resulting type of power will depend on what voltage we use. If peak voltages are used, then the result is peak power. If RMS voltages is used, then average power (often wrongly referred to as "RMS") is obtained. RMS (root-mean-square), is only a mathematical method to extract the mean value of an alternating signal (one with negative as well as positive values).Power is only positive (goes from the amplifier to the speaker, not the other way round), so does not need the "root" and the "square" of the RMS process (which just extract the sign out of a number), just the "mean" (average). Average power is therefore that which uses RMS voltage for its calculation.A 150-watt lightbulb presents a constant 150-watt load to an electrical power source when it is on. By contrast, a 150-watt audio amplifier will only rarely be called upon to deliver its full output to a loudspeaker. Same goes for the HU where it will rarely be called upon to blast out 50W from each channel. Thats instantaneous power capability.So for normal conditions, we would want the HU to deliver a continuous power output of less than 22W per channel for the front (cause audio settings been tuned) and the amp to supply to the rear with a stable output. This was we get quality well balanced sound instead of BOOM....BOOM....BOOM....ching...ching...ching....Though this might help guys.</blockquote>