the couple things I've noticed about creatives big hitting lineup (audigy platinum, platinum ex, and extigy) are
a) Creative is trying to push their sb1394 standard (basically it's firewire with creative giving it a stupid name. They can be so lame, sometimes.) as an extra port on their audigy cards. They want people to view their cards as cound cards with firewire functionality to go with their jukebox 3. They won't encourage people owning OTHER firewire cards until they find out how this ridiculous strategy goes, I think. Hence, they won't make firewire sound cards, only OTHER devices that can be plugged into the port on the audigy breakout box.
b) the extigy has pitiful ins and outs (except for the optical, but then you'd need to plug it into hardware that would replace its function if you had a real sound card, read below.) such as having no rca jacks. wtf?! if you're going to have a heavy duty sound card, why force people to use computer speakers? If they had rca jacks (as the gtxp, and both breakout audigies do) then you could plug them into most halfway decent stereo systems for outstanding sound, and into a digital reciever of a component system for insanely nice sound. For instance, I currently plug my soundblaster live! value into my stereo by converting the 1/8th inch jack into rca (greatly decreasing sound quality in the process) into the rca ins on my stereo. I have no comptuer speaker system. At some point my stereo (which is old) will be turned in for a component system. This will happen regardless of my computer's sound, for my cd's, my ps2, my tv, my dvd player, everything will be plugged into this. It makes no sense for me to get a computer speaker system for a sound card with 1/8th inch jacks if (to get the kind of sound I'd get out of the component system or even my stereo) I'd have to spend as much money on a good computer speaker system as I would on a far superior gtxp which has the rca to connect to my component system.
But the extigy DOES have the opticals, which WOULD plug into the reciever. but then, you're wasing the dolby digital decoding of the extigy (since the reciever will do the same thing) and it doesn't make any sense to me. except for notebooks. That thing is a godsend to notebook users. Anyway, my point comes down to, I'm buying a new sound card soon, and I feel like, as a desktop owner, I'd much rather have a gtxp for the reasons cited above.
Sorry this was so long, I seem to do that a lot.
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