Answering your question can get rather involved and requires knowing the space, the goals for the system, how it will be used, your budget for the speakers, etc. After reading your posts on this project I really have to be honest and state that I think you would be best served to get a local professional to help determine what it is you really need and how it all goes together. Forums are great for addressing specific questions or general discussions but it is simply not practical or appropriate to try to design a system via a forum like this.
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Originally Posted by headcrab
If you can afford it get a larger amp than you think you need. You can always turn down the gain, and if you decide to expand later, you have the capability.
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A common misconception. The 'gain' controls on an amplifier do not adjust or limit the output, they instead attenuate the signal between the amp inputs and the amplification circuit, which in most professional amplifiers is a fixed gain circuit. So an amplifier is always capable of full output regardless of the level control setting, the level control simply varies the input signal level required to get that output. This is important to understand as something like someone dropping a mic could still result in not only full rated output, but full output of a severely clipped and distorted signal.
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Originally Posted by NickJones
So make sure you buy an amp that matches the wattage of your speakers.
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Another common misunderstanding caused by applying band/PA sound concepts to installed audio systems. For permanent installs a more effective approach is to determine the levels and headroom that you want the system to provide at the listeners and then work back through the room to the speaker sensitivity and from that to the power required. The speaker power rating is then merely a verification that the speakers can handle the power required and not actally part of determining the power required. That is quite different than portable systems where the goal is not a specific result in a defined application but rather the most flexibility to support any variety of applications.
Maybe you start to see now why forums are not always a good way to try to design a system.