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Someone knows how to fix this problem, please When I disconect the speakers rund LX 3000 perfectly. I bought a USB Microsoft LifeChat LX 3000 headset, and when it is plugged into my USB port, no sound is heard from the speakers. Microsoft LifeChat LX 3000 stops the sound from the speakers when connected Go to control panel, sounds, reading devices, your audio device properties list there, tab improvements and then check the "disable all enhancements." Set to zero if necessary and I hope that your whistle no longer exist, mine is not at least. Some computers radiate RF frequencies that may cause a headphone amplifier humming, then try to select one with a good RF shielding. To enhance the sound quality or for more volume, consider adding a line to the outputs headphone amplifier. If necessary, compare the soundcard Headphone amplifiers with good audio specifications. Unfortunately, the line output will probably be of insufficient current drive for all except the most effective helmet (look for models with sensitivity of 100dB sides or more). In general, if a sound card has both speaker and output line, the speaker output is likely to be noisier than the output line (any hiss and hum will be more noticeable in headphones). Most of the cards her consumer have a separate audio input (often used to amplify the audio output of the CD-ROM) which is a good way to test the audio amplifier. The output signal is connected to a headphone amplifier, or external device using standard interconnects, such as a TRS connector or an RCA connector. Sound cards usually feature a digital-to-analog converter (DAC), which converts recorded or generated digital data into an analog format. Switch off the speakers and try again headset. Microsoft lifechat lx-3000 - whistling distortion from the microphone