durtt a écrit :
Bonjour :::: Cette carte http://www.midiman.net/products/co [...] _page1.php
Manuel ... http://www.midiman.net/support/man [...] manual.pdf
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Les possibilités des Dtt2500 ::: article en cache Google qui explique bien toutes les possibilités en fonction du mode de connection et du type de signal envoyé http://www.google.fr/search?q=cach [...] r&ie=UTF-8
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The DTT2500 comes with a box that has the amplifier and the Dolby Digital decoder that features a 24 bit Digital to Analog Converter (DAC). This DAC is also used when connecting the box to a Sound Blaster Live card with Creative?s proprietary DIN connector. The box offers options for setting the volume of the subwoofer, rear and center speakers in addition to the master volume control. This allows you to have significantly louder or weaker sound from the rear and/or center than from the front or even make the rear and/or center speaker completely silent. However, it's not possible to make the front speakers silent without also making the rear and center speaker silent. The box is also used to select one of the several modes these speakers can be in. The modes that are possible when using the analog connections are Dolby Prologic, Music, Movie, FourPoint, stereo, left or right channel. The option of only hearing the left or right channel is intended for Video CD discs where the two channels are used as an easy way of having two languages on the same CD. The FourPoint mode makes the speaker work just like Cambridge SoundWorks' FPS2000 system. That is, the two front speakers get the input from the soundcards first line out and the two rear speakers from the soundcards second line-out (or whatever you connected to the line-in and rear-in on the Decoder Amplifier box) while the center speaker is silent. If you only have connection to the Line-in you'll only hear sound from the two front satellites in this mode (I've seen other reviews saying it will copy the front sound to the rear channels but that's not true). If you choose stereo mode you will only hear sound from your 2 front speakers even if you have some input to the rear in. The Music and Movie mode uses Creative Multi Speaker Surround (CMSS), a feature that creates a 5.1 speaker surround effect from a stereo signal. When watching movies, CMSS will place most of the dialog (and all action in the center) in the more powerful center channel. The Movie setting seemed to be slightly better at placing the dialog in the center channel but there is not much of a difference between these modes when playing music, games (stereo ones) or movies. The DIN connection works just like the analog ones with the difference you will use the DAC of the decoder box instead of the Live soundcard. In theory this results in cleaner sound as the signal is kept digital until outside the electrically noisy environment inside the PC case but in reality we don?t hear much if any difference in terms of noise but the volume is louder by a couple dB. If you feed sound to both the DIN and the analog in the DIN will take priority if you have selected input to be auto (via a switch on the back of the decoder), if you have the switch set to analog the DIN will not work. The SDPIF will still work when in analog mode and will play regardless of other settings. For example, if you set the decoder box to 4.1 mode you can get 4 speaker playback for games and also have 5.1 support via the COAX in at the same time.
When using the S/PDIF digital input you have the choice of Dolby Digital (AC-3), Digital Pro-Logic mode and plain stereo. The speaker system will automatically detect if the input is Dolby Digital or Digital Pro-Logic. If you only have digital input none of the CMSS options will work. You'll only get sound from the two front satellites unless you force use of Digital Prologic in which case the center speaker also will be used and some sound will leak to the rear channels, just like it will if you force Pro Logic in analog mode. It's possible to hear both analog sound and digital sound at the same time by switching to FourPoint and use the digital signal for the front and the analog for the rear.
When it comes to Dolby Digital the decoder only has one mode, which is small for all satellites, that is low frequencies are filtered from the satellites and sent to the subwoofer. The reason is of course that the DTT2500 satellites are not full frequency speakers and wouldn't be able to produce good bass without the subwoofer. In case you don't know, Dolby Digital decoders usually have a small and large mode. In the large mode the satellites get all frequencies which can cover the entire audible range (20 Hz ? 20,000 Hz), both for front and surround satellites. In addition to that they have a LFE (low frequency channel) but it doesn't mean they use it for all low frequencies, in fact many movies doesn't use the LFE channel much. However the LFE track (the ".1" ) makes it possible to reproduce low bass effects with stunning impact (twice as loud as the other channels) so when it's used your subwoofer will really rumble.
The box also includes a speaker-test button that you can use to make sure you placed the speakers properly and connected them correctly to the box. What the test cannot do is determine if you connected the box correctly to the computer. Finally we have a mute button and of course a power off switch. The only thing I found missing was any sort of balance option or headphone output. _________________________________________________________________
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