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5.1 to 7.1 confusion

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I have a 5.1 system with 5 floor standing speakers. I have the 2 surround speakers near the rear corners of the room. I have 2 smaller matching speakers that I will use as the rear center channel. When I set up the rear center channel, my current larger surrounds will be labeled side left and right accordng to the processor. Will I need to move them from their locations? A guy at the local AV store said that I need to buy small dipole wall speakers for the side channels and not use the large surrounds. Doesn't that defeat the purpose of having full range speakers? Will a 7.1 processor realize the difference between 7.1 movie mode with dipole side speakers and a 5.1 music mode with large direct radiators? Thanks in advance for your responses, pete.
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Will a 7.1 processor realize the difference between 7.1 movie mode with dipole side speakers and a 5.1 music mode with large direct radiators? Thanks in advance for your responses, pete.
The processor just plays the music; it doesn't care what kind of speaker you use. The sound you get out obviously does depend on whether you're using a dipole or monopole, full-range or small.


As you probably know, THx recommends the dipole speaker for Dolby ProLogic recordings. This fills the room better with the sound.

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Will I need to move them from their locations?
The rear/side speakers should be placed on an arc. If you use monopole speakers, locate the side speakers 110 degrees from directly ahead and the rears 135 degrees.

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Doesn't that defeat the purpose of having full range speakers?
The new DD and DTS soundtracks are full range. Thus full range speakers are best. Many processors though allow you to set speakers as "small" and redirect the bass information to a subwoofer.
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