![]() The technology uses a built-in decoder to decode the signal and separate individual sounds in to one of 5 (front left and right, rear left and right, center channel) independent speakers. Dolby DigitalÄolby Digital is the successor to Pro Logic, and came about when 5.1 surround started to become commonplace in households around the world. This allowed you to place additional speakers above the front left and right channels in order to create more realistic-sounding effects such as rustling tree branches, or rain. Pro Logic IIz added a new dimension, height. Pro Logic IIx added the ability to process sound amongst 6 or 7 (6.1 and 7.1) channels depending on your speaker setup. Just to touch on it briefly, Dolby Pro Logic IIx and IIz are essentially the same as the original Dolby Pro Logic. If you're listening to Spotify, for example the audio is in stereo anyway, so it really is a no harm, no foul situation when you're simply adding more speakers to the mix. Where it is useful is in a strictly audio setting. ![]() While this isn't completely useless, it's certainly not the format I'd choose if I were gaming or watching a movie (although there are typically settings in the audio menu for both). ![]() The only variation is amid the sounds coming from the left and the right channels. It still isn't actual surround, as you aren't getting different sounds from each speaker. The technology was fundamentally the same, but with the addition of multi-channel support. ![]() Pro Logic II came along later, and added the ability to split this signal amongst 5 speakers and a separate subwoofer. Pro Logic decoded the audio from a record, cassette tape or VHS movie and played it back over the two channels with the only variation in sound being left and right. Think 70s-style woodgrain cabinet-type speakers. Typically, the subwoofer was actually built in to the speakers it was designed for. The original format was designed to utilize two channels and sometimes a subwoofer. ![]()
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