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Posted on Jan 02, 2017
"Noise", as used in this document, is a general term referring to
any sound a speaker system makes that is not part of the original
source material. There are many different types and sources of noise,
each with its own solution. Below is an explanation of the common types
of noise, what causes them, and how to minimize their occurrence.
Hum or Buzz
There are four common causes of humming and buzzing:
Z-540 / Z-560 (2 channel sound card): Depress the M3D button.
Z-640 (4 channel sound card): Depress the Matrix button.
Z-680 (2 or 4 channel sound card): Disconnect the unused input cables from the control pod
There are three main causes of pops and clicks:
A stuttering sound track is an indication of either insufficient or conflicting computer resources. Check to make sure that your computer has sufficient processor power and memory to handle the applications you are running, especially if you are using a software DVD player. Defragmenting your hard drive may also help. If you are sure you have sufficient resources, check to make sure that you don't have any conflicting IRQ or DMA channels.
We have also seen some software DVD player/sound card combinations that cannot properly output a Dolby Digital or DTS signal through the sound card's S/PDIF digital connector. (S/PDIF is a generic term for either coax or optical digital connections.) The result, when using a Z-680 hooked up to a S/PDIF connector, is a stuttering soundtrack. As mentioned, this stuttering is caused by the computer, not the Z-680 speakers. Switching the software DVD player's sound output to the 5.1 analog outputs will generally solve this problem.
All high-powered amplification devices - everything from multimedia systems to home theater systems to movie theater sound systems -- generate some level of background noise, or hiss. In addition, low quality sound cards with poor signal-to-noise ratios can generate a significant amount of steady hiss that is reproduced on the speakers. Under normal conditions at a normal listening distance, the hiss coming from the sound system should not be noticeable. In a very quiet room, or if you place your ear very close to the speaker, you may hear a very low level hiss. This is normal, but should be completely masked by normal music and game sounds.
If you find that hiss is noticeable, it is likely that the speakers are too close to your listening position. If the speakers are too close, you will not obtain the best imaging of the sound and you risk damage to your hearing when the system is playing at full power levels. Try moving the speakers further away from your normal listening position. We recommend at least 18" for the moderately-powered systems (such as Z-340, Z-540, and Z-640) and at least 30" for higher-powered systems (such as the Z-560 and Z-680).
Also, note that the satellites in most Logitech speaker products are designed to be wall-mounted. Wall mounting the speakers provides two benefits: 1) it moves the of the satellites further away from your listening position, making any hiss less noticeable and 2) it moves all of the satellites further away from each other, providing better channel separation and surround sound spatialization.
Posted on Feb 29, 2008
how to install a A4 tech PK 635 M web cam without using cd installer?
i have no cd installer of a4 tech pk635 m webcam
Posted on May 20, 2009
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