Choosing a decent amplifier for your loudspeakers is not a trivial task. I will describe some simple amplifier vocabulary and give some advice to assist you select the right amplifier. They use different technologies and have numerous technical specs. The most apparent criterion is the size of the amplifier. Harmonic distortion of tube amps is often as large as 10%. Solid-state amps will have less audio distortion. The left over part is wasted as heat. An amp with low power efficiency will radiate the majority of its power as heat. "Class-D" amplifiers, though, which are also called "digital amplifiers" have a power efficiency of at the least 80% and are smaller and have a smaller power supply than comparable analog amplifiers. The disadvantage is that many digital amps have larger audio distortion than analog amplifiers though several of the latest types make use of a feedback mechanism to minimize distortion to levels of 0.05% and below. When picking an amp, make sure that the output power is enough to drive your loudspeakers. The needed power will be determined by how much power your loudspeakers can handle as well as the size of your room where you will be listening. Loudspeaker power handling capability is given as peak power and average power. Speakers however differ in their impedance and sensitivity. As a rule of thumb loudspeakers with low impedance offer higher sensitivity.
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