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In Windows 7, you can go to Sound configuration, select your speakers and click Configure. You will then get a dialog called Speaker Setup. You start with a question about Audio channels (Stereo, Quadraphonic, ...) and in the next step it asks you which of your speakers are full-range speakers.
What exactly are full-range speakers, how do I know if I have them? And what exactly is the difference between checking and not checking that checkbox?
1Saying that, a high-end home cinema system could well have full range main speakers as well as a very low-frequency subwoofer, but if you had such a system, you'd probably know about this stuff in order to want to buy it. – paradroid – 2010-09-12T18:23:01.887