QUOTE(SpikeTwo @ Dec 8 2008, 03:34 AM)
hm...but the AC3filter icon popped out, if i uncheck the AC3 passthru, no sound will come out from my speakers as i am using analogue output.
how to know i am 100% using the soundcard decoder? as i did something in the media player classic options, the ac3filter no longer pops out...but there's still 5.1 sound from movies. i checked "transform AC3/DTS" in Options -> internal filters -> transform filters. so this is hardware decoding? done by soundcard? i think z5500 can't decode analogue signals...can it? i heard only with optical we can have DTS/DD sounds.
anyway, tested DTS music sounds like crap using this setting. AC3 files sounds fine tho. Turned AC3filter back on, it sounds perfect again. LOL...wonder why AC3 ok, DTS sounded like shit. but if using software decoding by AC3filter, both DTS and DD sounds great. hmmmm....any help? me kinda noob. tried google but it is hard to understand.
First of all, go
HERE to check whether your card is equipped with DD/DTS decoder or not...So far only XtremeMusic and X-Fi Fatality can ensure 100% got built-in decoder.
AC3filter is a decoding software, means if you use it to decode ('use SPDIF' is uncheck), the software will decode the DD/DTS stream and send the decoded sound to the separate channel of the sound card, so it won't use the onboard DD/DTS hardware decoder at all.
Hence we need a player that can feed the X-FI with the raw stream for the sound card itself to decode it, i guess you meant this, rite? But so far i can't find any kind of this player that can do this, but we can use some 'trick' in the AC3filter to get the job done.
Open your AC3Filter, tick the 'use SPDIF' option, at the Creative Console Launcher(Entertainment Mode), click on the DD/DTS icon, and select the option as shown.
One way to confirm the signal is hardware decoded, try change the 'Dynamic Range' option from Full to Night when playback DD/DTS movie, it will give you huge difference. (no effect observed if Software decoding, because 'bypass' this onboard decoder adi).
EDIT: Why it works? Now the DD/DTS playback got 3 part in the chain. (1). DD/DTS raw data Input from DVD/files -> (2). then to the software to extract the raw data from DVD/files -> (3). and finally output from sound card.
AC3Filter is at the intermediate part of the chain and onboard decoder is at (3). In (2) if we let the software to decode, the software will process the raw data and send to the multichannel of the sound card, the sound card only playback the signal they receive, the card won't recognize it is DD/DTS signal at all.
Hence, to bypass the decode action in (2), we use SPDIF passthrough, now the raw data will bypass the AC3Filter decoding chain and send directly to another 'gate' in (3). In (3) if we select 'on(external decoder) option, the raw data will further bypass the onboard decoder and send to the external decoder (your Z-5500) through Optical/coaxial connection; otherwise if we choose 'off(Built-in decoder)', the DD/DTS flag in the raw data will activate the onboard decoder and all the decoding job will done by the sound card itself.
Maybe my explaination not so good, but i hope you understand.
This post has been edited by coolkwc: Dec 8 2008, 12:49 PM 
Nov 18 2008, 04:07 PM
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