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Iš DOLBY dokumento apie kolonėlių išdėstymą:
"
3.2.2 Surround Speakers
Whenever possible, use the same speakers all around to achieve uniformity. 
If this is
not feasible, the surround speakers may be smaller than the front speakers 
but should
maintain the same character; i.e. they might be smaller speakers from the 
same
manufacturer.

The front and surround speakers should be equidistant from the listener, 
with their
acoustic centers in the horizontal plane that is on-axis to the ear. Refer 
to Figure 3-5.
The surround speakers should achieve coincident arrival with the front 
speakers either
as a result of equal path lengths or through alignment with signal delays. 
Please refer
to Section 3.4, Level Calibration.

The Surround speakers must exhibit the same acoustic polarity as the front 
speakers.
It is highly recommended that electronic signal polarity be maintained 
throughout the
entire monitoring system."

Šaltinis (3 skyrius): 
http://www.dolby.com/uploadedFiles/zz-_Shared_Assets/English_PDFs/Professional/L.mn.0002.5.1guide.pdf