[leungalv]

Hi, I'm new to the forums here, though I have been reading quite a bit of the posts, I've never actually posted. I was wondering if anyone could shed some light on this issue. I just installed a new sound card, and every time I open up an AVI file or mkv file that uses ffdshow audio decoder, I get a high pitched siren noise emitting from the speakers. If I close the file and reopen it, the high pitched siren noise is gone.


Also, if I go into ffdshow audio configuration panel and disable the mixer, the siren sound goes away ... but then so does the surround sound for AVI files and such. As I cycle through the speaker configurations (i.e. 1/0/0; 2/0/1; 2/0/2 etc etc), the siren noise either goes away or changes pitch frequency.


Old sound card: Creative Soundblaster Audigy 2 ZS ... all drivers uninstalled and cleaned with driver sweeper and ccleaner.


New sound card: HT Omega Claro with drivers from HT Omega site ...


Speakers: Analog output to Logitech Z-560 4.1


Thanks.

 

[leungalv]

Update: the high pitched siren noise is only present when I have LFE checked under speaker setup for ffdshow audio. When it is unchecked, everything plays fine ...

Do I really need to check LFE with a 4.1 system? Some say yes because it transmits the low frequency to the subwoofer ... Others say no because the sub is not a discreet channel? ...


There is no high pitched noise when playing the same files with VLC player.