Class AB audio amplifiers are commonly used but the efficiency is 50%. While the efficiency of class D audio amplifiers is 90% but are rarely used. The purpose of this research is to know how much the power efficiency of field sound system between 1000 watts class AB amplifier and 900 watts class D amplifier. This study is a comparative study that compares different variables with the same sample. The results of power efficiency are obtained from the percentage comparison between the output power and the input power of each audio amplifier. The power efficiency of class D audio amplifiers with IRS D900 type larger than class AB audio amplifiers with Apex B500 type. The efficiency value of class D audio amplifiers at the highest output power reaches 87% while class AB audio amplifiers are only 73%.Abstrak-Audio amplifier kelas AB umum digunakan namun memiliki efisiensi 50%. Sedangkan audio amplifier kelas D memiliki efisiensi 90% akan tetapi masih jarang digunakan. Tujuan dari penelitian ini adalah untuk mengetahui besar efisiensi daya amplifier kelas AB 1000 watt dan kelas D 900 watt pada sound system lapangan. Penelitian ini merupakan penelitian komparatif yaitu membandingkan variabel yang berbeda dengan sampel yang sama. Pada penelitian ini hasil efesiensi daya diperoleh dari persentase perbandingan antara daya keluaran dengan daya masukan masing-masing audio amplifier. Perbandingan efisiensi daya pada audio amplifier kelas AB dengan tipe Apex B500 dan audio amplifier kelas D dengan tipe IRS D900 lebih besar kelas D dibanding kelas AB. Nilai efisiensi tertinggi dari audio amplifier kelas D pada daya output tertinggi mencapai 87% sedangkan audio amplifier kelas AB hanya sebesar 73%. Kata kunci-efisiensi daya, audio amplifier, kelas D, kelas AB
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