Ohm’s Law is a set of mathematical formulas used to calculate the power delivered to a load. The load resistance must decrease or the voltage must increase to get more power. To help better understand this, we can look at Ohm’s law which states that power is related to the resistance of a load (speaker impedance) and the supply voltage. Extra convenience functions (ex.: speaker-level input stages or bass boost)Ĭar audio presents a really tough challenge: using only a +12V supply, we can’t directly create a large power output to use for both factory speakers or upgraded speakers.Noise prevention (“ground loop”) circuitry.A DC-DC (direct current) step up switching power supply.
Nearly all aftermarket car audio power amps have the following: Due to the large amps drawn, thick gauge power wire and ground wire connections are made to the vehicle battery and metal chassis directly in most cases.Ī car stereo sends an audio signal via an RCA cable or other connection where the boosted electrical signal is delivered to speaker terminals for use with wire. How does a car amp work?Īn internal power supply, supplied by the battery positive and negative power wiring, generates a higher output voltage – and more power – than is otherwise possible from a 12 volt power source. Products sold that list the CEA-2006 specifications have demonstrated they’ll deliver what the manufacturer advertises. To help buyers get more accurate information the Consumer Electronics Association (CEA) 2006 standard was created to encourage providing accurate specifications. As AC voltage is different than direct current (DC), the math is a bit different. RMS power refers to the root mean square measurement used in electrical engineering to describe alternating current (AC) signals like those used in sound electronics. Although it sounds impressive, the “peak” or “maximum” power specification is more of a technicality and not what you’ll get during normal use. The continuous or RMS watt rating describes the power output an amp can realistically deliver reliably. Car stereos often use a more basic design and cheaper components that limit what you can hear.
This is also a problem when you’d like to use 4 ohm or even 2Ω aftermarket speakers that need more power for maximum performance when upgrading your sound system.Īn external amp provides higher sound quality as it can offer lower noise and distortion due to more advanced electronics included for that purpose. Most car audio in-dash stereos have only about 15 to 18 watts available and begin to distort very badly at their maximum output.Īn external amplifier not only solves this problem but also can greatly improve the reproduction fidelity of the music you enjoy.įor powerful bass, subwoofers need lots of power which is impossible to get from a car stereo alone. It can drive loudspeakers connected with speaker wire with more power, volume, and sound clarity.
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