If you feed analog signals to the receiver, only the front channels will operate (as if you played sound through your stereo PC speakers). When it receives compressed audio data (e.g., AC3 or DVD audio) from a sound card’s digital output, it decodes the audio and drives the proper speakers to produce " surround sound.” However, coaxial connectors will not handle multichannel audio already in analog form from the sound card. Home theater receivers typically use coaxial connections. ( )-to isolate the PC speaker output from the stereo’s auxiliary input and decouple the electrical connection between the two devices. Use a ground loop isolator-such as the $29.95 unit from Xitel Pty., Ltd. When you connect two separate systems in this way, a ground loop sometimes occurs because of the different voltages at both ends of the “ground” wire.
Turn off any high-energy devices in the house, or power the speakers from a different circuit in the house.Īnother common hum problem occurs when you attempt to wire your PC speaker output to your home stereo’s auxiliary input. For example, high-energy devices such as air conditioners, motors, coffee makers, and even a low-quality computer power supply can sometimes place noise on the AC circuit. Of course, there may be damage to the speaker’s amplifier circuit, so try another set of powered speakers.Īlso, check for low-frequency noise on the AC power line. This minor adjustment often goes a long way toward cleaning up a noisy signal. Remember that high volumes on your amplified speakers can really bring out any unwanted noise in your audio, so turn up the mixer signals in the Windows Volume Control, and turn down the speaker volume to the lowest acceptable level (see " Eliminating Audio Distortion" earlier in this chapter). Symptoms like hum and buzz indicate a power grounding issue, but start with the basics (e.g., checking for tight speaker connections).
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