This is power adapter specs for HK206 found elsewhere
Made by: HON-KWANG Plug in class 2 transformer Model No: D12-10-1000 P/N: 66-000-118-01 INPUT: 120V 60Hz 25W OUTPUT: 12VDC 1000mA The polarity is negative (-) on the outside and positive (+) on the inside.
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Do you get sound out of the computer speaker (inside computer)? If not, go to device Manager and see if the sound drivers are loaded. If not, you will have to find the drivers and load them. If you sound from the computer speaker, then I would try the speakers on another computer that you know works with external speakers to ensure the speakers are good.
If you are unable to get sound from speakers, chances are it's your computer and not the speakers. Speakers do not require a driver to work, the computer has to have the audio driver to make speakers work. To test this theory, simply turn speakers on and plug them into an mp3 player or cell phone (anything with 3.5 mm jack) and turn volume up - should have sound. What you will need to do is find model computer and look for audio driver for that computer.
it comes with ur desktop speaker harman kardon hk 206. it is a 12v 1A dc power supply. u can use it in any equipment which needs that power rating. only thing to remember is, check the polarity of both before connecting.
You need a AC to DC power supply capable of supplying 120VAC in, 12VDC out @ 1 amp (1000 mA). The center of the plug must be + and the outside -. I believe Dell supports these speakers and may have the power supply available. Radio Shack might have a substitute PS as well, you just have to match the plug size. Be careful what you pay for it, a new pair of these speakers can be purchased for around $20.
have you plugged anything else in to make sure the usb port is working? does the computer recognize the usb speakers when you plug the usb plug into the computer? do the speakers work on another computer? if you wiggle the usb wires around does it make a sound through the speakers? eliminate these questions so that we can move on to isolating the issue.