The specifications have been established and the format has been adopted by virtually all audio and video manufacturers. The television industry has also agreed to broadcast in Dolby Digital when they change over to the new digital transmission standards that are slated to be phased in over the next few years. New software titles are being released almost daily, also at very reasonable prices. Current equipment costs are now equal to standard Dolby Pro Logic products. All Dolby Digital receivers are backwards compatible with Dolby Pro logic.
Smaller speakers are at a disadvantage from the beginning.
They can't move as much air as their larger counterparts, so their task is much harder. You will be amazed at the difference you hear. Don't forget about adding a subwoofer to your system as well. The center channel speaker is arguably the most important speaker in your surround sound system. Originally thought of as a voice channel only, it has evolved to the level where all of the sound actually starts.