Speaker Selection and Amplifier Power Ratings Speaker selection and amplifier power ratings. Too often we receive speakers for warranty repair in which the woofer voice. The. voice coil that drives the cone has overheated and burnt. Unfortunately, in practically all of these cases. Cause #1: Excessive power to speakers. That is, an amplifier rated at 1.
What's the difference between RMS and Program? Discussion in 'Amps and Cabs . The continuous power in watts. RMS, Continuous, Program, Peak, volume vs. Best practice is to provide an amplifier that will be at least 2 times the speakers continuous power. First, a definition: POWER is the rate at which energy is converted from. The basic international unit of energy is called a JOULE. NEWTON) through a distance of one meter. The number of. Joules of energy converted each second defines the amount of Power in WATTS. Watt = 1 Joule/second; 5 watts = 5 Joules/second, etc. From your AC power outlet the electrical energy is controlled by. The more energy. (per second) is converted into sound, the louder the sound will be. So volume depends on the. POWER used to create the sound by the speaker. There are a number of methods used to describe the power of an electrical. These methods are given names such as . The power. being used at any instant during the process is called . In a speaker, the peak power would occur at. In an. amplifier, the maximum peak power output to a speaker is limited by the. If the level controls are increased beyond the point. As an analogy, think of tying a weight to. If the string is. This is like an amplifier delivering a low volume. If you lengthen the string, the circle gets bigger. An. amplifier would be delivering more power to the speaker, and the sound would be. If you lengthen the string too much, the weight will hit the ceiling. The size of the. circle (and the amount of sound) is limited by the ceiling and the floor (the. In an amplifier, the peak power rating is useful. The. method of comparison was based on the amount of heat each form of power would. So the values of voltage and. AC electricity would have the same average power. The Average Power (often called . Most audio. power amplifiers are rated for their Maximum Continuous Average (. They are explained by the manufacturers by saying that. No exact formula. A detailed, rather technical explanation is given by Jon M. Risch. of Peavey Electronics in. Herein lies the problem. How can you match a speaker system to an amplifier when. Ultimately. there must be some method of comparing apples to apples when it comes to the. Remember that average power was defined in terms of the . When audio power is applied to a speaker, much. However, a. significant portion of it gets converted to heat in the wire of the voice coil. This causes a buzz or rattle from the speaker. If the wire gets even. Since it is heat that causes the speaker failure, you can see that it. Now let's consider the amplifier power rating. If you examine a specification. Average (. This is like swinging your weighted string so. But keep in mind that you can. When this happens the power amplifier can. TWICE AS MUCH power to the speakers as it is rated for. For example, an amplifier. Be sure you are comparing amp and speaker ratings for the same. We will assume you are only using one speaker per channel in. Now, if you want to keep from smoking your speakers, you should consider the. The first thing to do is find out what form the speaker power rating. If the speaker rating is clearly stated in RMS WATTS or AVERAGE POWER, you. If you are buying an amplifier. RMS is usually adequate. If you. are buying an amp rated at 1. RMS Average Power rating of 1. Program. power rating should be 2. In practice, for an application where the program material contains high average. Program Power rating should be MORE than two times. RMS power rating. For maximum protection, select speakers with. Program Power ratings of four times the amplifier power rating. Keep in mind. that these rules are based on approximations and some assumptions, so no guarantee can be made that you still won't. The speaker in the photo above was rated at 2. IEC for a duration of 8. IEC for a duration of 1. Case #2: Excessive distortion. The amplifier goes into clipping (described above). The result is a. burnt tweeter voice coil. It is NOT a. safe practice for systems where high continuous average volume is required, such. If you go back and examine. To avoid damage due to excessive distortion, be sure your system's amplifier. Using an amplifier with twice the power. More information about speakers and impedance can be found here.(*1). I disagree with this recommendation.)(*2) JBL has an article on. Speaker Power Requirements which includes three different descriptions of. A full explanation of power is well beyond the scope of this article. If you are really interested, be prepared. Copyright . Preston, Preston. Electronics LLC. All rights.
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