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Old 21st February 2010, 10:10 PM   #11
hates ground loops
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Flatlander,

Why not a different approach? I have a wireless music bridge (Linksys WMB54G) and an external DAC. The Linksys, the C-Media Wi-Sonic and the Sondigo Sirocco Wireless Audio Bridge are the same product in a different package, you can find these cheap off ebay. They work with a LAN of WiFi connection.
They're upsampling it seems (A new wireless source: Linksys WMB54G - Head-Fi: Covering Headphones, Earphones and Portable Audio) but still, I love the sound very much. You can stream whatever audio from your PC (or any other computer that has the appropriate software installed) to the bridge and use the PC's volume control.

Or you look for a soundcard with an optical digital output and use an external DAC (there are nice DACs with the PCM1793 on ebay). No groudloops, no hum, no cables or wires across the room.

Edit: typo
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Last edited by Rodeodave; 21st February 2010 at 10:19 PM.
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Old 22nd February 2010, 11:51 AM   #12
1543 is offline 1543  Germany
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Quote:
Originally Posted by phofman View Post
How can adding harmonics turn square wave to sine shape? I can imagine that by removing harmonics which is what proper fs/2 output filter is supposed to do. I know nothing about VLSC, do not have the card physically, but I assumed it has a regular analog output filter.
Have a look here. It is in chinese language but you can see in the picture at the middle of the page where the VLSCircuitry is located on the soundcard.

●新製品情報 HDサウンド対応 PCI デジタル・オーディオ・ボード 「SE-200PCI」
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Old 22nd February 2010, 01:02 PM   #13
phofman is offline phofman  Czech Republic
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Details of the patent mentioned on the japanese page

Google Translation

are here:

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It is some kind of a low pass filter.
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Old 22nd February 2010, 03:17 PM   #14
1543 is offline 1543  Germany
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Quote:
Originally Posted by phofman View Post
Details of the patent mentioned on the japanese page

Google Translation

are here:

Search Result

It is some kind of a low pass filter.
Perhaps it is a low pass filter too, but the circuit causes a lot of harmonics. I had this card several month. You can hear the VLSC effect and harmonics, you can measure it. After you have measured it you wont listen to the card anymore. It does not make sense spent so much money for a soundcard which degrades the sound. Pioneer had a technology a few years ago named Legato Link to create harmonic contenct for enhancing the CD spectrum. Some like it. I like it not, because in most situations it make the sound worse.
Had have such a player with Legato Link a few years ago.
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