Perhaps your ac adapter has failed or the built in amplifier, if it was bought new or not make sure that u have the correct power supply and if your not sure you do find an adequet replacement w/ matching output specs and polarity. They are not expensive or hard to come by. If that doesnt do it than it is more than likely the built in amp located in the sub. Another way to test the speakers is to unplug them from your computer and plug the same jack into a i-pod or any portable audio devices line out or headphone jack if the speakers make sound with volume there may be a problem w/ your computer or config.
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if the receiver does not power on from standby there is a problem like bad power supply or even bad macroprocessor. You need to bring it to a service center for diagnosing. 10-years old receiver, maybe better to buy new one.
CD's and FM radio are created in 2 stereo channels. To listen to them in Surround, artificial processing has to take place in your receiver, so artifacts and fading are quite common when you do this. When you turn the surround off, your stereo is processing the information properly and it will sound right.
Sounds like you have it hooked up properly. Be aware that if there is not a digitally encoded signal for surround sound [they don't always do that] you simply won't have surround sound. Usually there is a mode in your receiver/amplifier that will allow you to simulate surround sound. An example of that would be "theater" or "hall" sound. Try it with a DVD known to have surround sound encoding [most of them do] and see if it works that way. If it doesn't then check your owners manual for information about how to make sure that feature is actually turned "on".
make sure that all input cables are in the correct positon also make sure that any inputs you are using don't have a macrovision in them that will also kill your sound due to copyright laws and stuff but main thing check all wires coming in to receiver and if you need more inputs go to walmart and get a rca splitter basicaly its a 1 in two out connection to add more cables in the input
well as long as all signals are routed through the Denon your on the right track, now what else you have to do is connect all devices to the reciever do not loop one device through another. Also you have to try the different surround fields to hear the one you like the best for music I use 5Ch stereo for movies the surround field varies based on the type of movie
It sounds like you don't have your surround sound source set up properly (your DVD player is not set up for PCM sound).
the best quality audio will be to set up either digital or optical audio between the DVD and the receiver.
Once you have connected the optical or digital audio cable between the DVD and receiver, you have to go into the DVD player audio setup and change it to PCM digital audio or you will not get surround sound. DVD players are not set up by default to output surround sound.