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I don't know how "Techman" got a "Guru" rating but his answer is completely stupid.
The manufacturer rates the speaker outputs for 8 ohms. Plenty of people have reported running 6 ohm speakers just fine. What few people realize is that this impedance rating is not fixed like a resistor, it changes based on frequency.
Anyway, all the rating means is that you have to keep the individual total speaker output rating near 8 ohms to avoid over or underloading the amplifier channel. You could put two 4 ohm speakers in series (some dual voicecoil subwoofers are manufactured this way on purpose), or two 16 ohm speakers in parallel. You could put four 2-ohm speakers in series, four 32 ohm speakers in parallel, two 2-ohm speakers in series with two 16 ohm speakers in parallel, etc etc etc. As long as the equivalent resistance presented to the speaker output is around 8 ohms.
Also if you underload (present more than 8 ohms) you won't "burn up" anything, you just won't develop the maximum volume potential of the amplifier out of the speakers.