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[porto_citropolis]

anyone please?

[zetski210]

You are correct, Pro Logic 1 (PL1) used L & R (stereo) to extract 4ch (Fr Left, Fr Right, Cntr & Rear) to "simulate" surround sound.  Note that the rear speakers produce the same channel, they're just delayed by a few milli-seconds from the front to give the listener a feeling of depth.

Pro Logic 2 (PL2) uses a more sophisticated algorithm to produce 5 discreet channels from a stereo source. In other words, the rear channels are now seperated.  The bass from the source is extracted and sent to the sub creating the ".1" channel.  Note that PL2 only works from a stereo source and any 5.1 source must be downmixed to stereo first (this kind of defeats the purpose   )

Dolby Digital 5.1 (DD) and DTS 5.1 are algorithms that are used when the soundtrack is encoded and require a lisenced receiver to decode them.  The difference between DD/DTS and PL2 is that DD/DTS are discretely decoded exactly as they were encoded, whereas PL2 is really just a simulation of 5.1 surround from a stereo source.

If you want to upgrade to PL2 (which sounds HEAPS better than PL1) you may find that it is pretty much impossible to get a receiver that does PL2 and not Dolby Digital and/or DTS.  You can pick up an "el-cheapo" AV receiver for pretty cheap and these days you can pick up a package of a reciver with speakers for a couple of hundred bucks.

I have Yamaha AV decoder that decodes everything, but when a stereo source is present I always use PL2 (actually I use DTS NEO - similar thing, but it sounds better than Dolby     ).

[porto_citropolis]

thanks a lot for the answers.

So, do you think it worth to upgrade to prologic II?

http://www.worten.pt...D=1163030105189

i can buy that set with decoder and speakers(the speakers aren't the best but i can connect my grundig speaker from my prologic I wich have 50W RMS(front and center) and 25W RMS(rear))

that costs +/- 65 American Dollars

or the 200$ DD 5.1 Decoders or a set of speakers like logitech or creative digital it's much much better than prologic II?

and how about this? http://sevel-pc.de/p...8dcc520702143b5

is that a good solution for my xbox to play and watch movies?

regards

[zetski210]

Upgrading is certainly worth it, but it depends on how much time you spend watching movies/playing games to decide how much to invest.  

I'm currently fixing aLogitech Z5450: http://www.logitech....CONTENTID=10928
I got it for free as it's busted.  I'll use that when it's fixed, but for now, I've got an old Yamaha that does the job.  I do, however, spend more time watching movies than playing games, but even so, most of my time is spent studying.

[timdog82001]

yep, that will give you Dolby Digital 5.1.  However, you might not be able to use your other speakers with it if they aren't they right ohms, and also, it may simply not be powerful enough to drive your other speakers, and even if it is, they certainly won't sound their best.

[porto_citropolis]

ohh.. i didn't know that  

anyway, that DD 5.1 speakers aren't the best but surely it's best than prologic I..

[porto_citropolis]

good news.. the DD 5.1 kit from teac, uses 8ohm's in the 5 speakers and it's exactly 8ohm's that my front and center speaker also uses from my prologic I..

This is good if i can use that 3 speakers with the DD Decoder, they sound very very well.

My two rear speakers from the prologic I are 16ohm's...

If i can at least use that 2 front speakers plus the center speaker and if they perform as well as they do with the prologic I decoder, it's fantastic

BTW, my 2 rear speakers from the prologic I are 16ohm's and the rear speakers from the DD 5.1 kit are 8ohm, can i try to connect that speakers or there are riscs of damage due the different impedance?