I'm not a stereo buff by any means, but...
Listed on somewhere on every electronic device is it's Thevenin-Norton resistance, current, and voltage, along with the maximum power it's rated for. (What that means is someone simplified whatever circuitry is inside the unit down to the voltage at the terminals, a single resistor, and the current that would flow through that resistor at the aforementioned voltage.) You can find these on the underside of your laptop, on a sticker on the power supply in your computer, inside the door of your microwave, stamped on the top of your car battery, etc. It's usually someplace fairly easy to find, but also out of view for common usage (i.e. not smack on the front of your monitor). On speakers and amplifiers, they're on the back near all the jacks. So long as your speakers are rated for a greater power than what your amp is putting out, you're fine. If your speakers are rated lower, then you need some intermediary device to control the amount of power being delivered to the speakers. Alternatively, you could use the information on the stickers to draw up a circuit diagram for your stereo system and figure out what the power draw is going to be.
Some (I would think most) amplifiers have different jacks on them that are rated for various different speaker sizes. If your amp is rated higher than your speakers, you may be able to circumvent that by locating the appropriate jacks on the back of your amp.
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