In this age of 500 and 1000 Watt stereo amplifiers it's easy to forget that there are still plenty of uses for a small 40 watt per channel amplifier like the Pyle Pro PCAU22 Mini 40 Watt x 2 Stereo Power Amplifier w/ USB Input.
You can use it to fill your kitchen, den, bedroom or computer desk with music from your Walkman or MP3 player via its front-panel USB input to a pair of desktop speakers.
And it works just as well to amplify the weak audio your netbook or notebook's speakers put out. Again, just feed the audio into the PCAU22 via the USB input or use a mini jack to RCA L/R pair cable (available separately) to connect you computer to the PCAU22.
In both scenarios, just add a modest pair of speakers and hook them up to the back wire-capture terminals and you've got audio loud enough to dance to.