Acoustics can vary from location to location. The covering (or lack of covering) on floors, ceilings, windows and the type and amount of furniture or bodies in a room can alter sound quality.
A cheap or poorly constructed instrument will not produce the quality of sound a better constructed one. Some guitars are designed for fuller lower notes. See [http://books.google.com/books?id=oejZDX3iigsC&pg=PA38&lpg=PA38&dq=guitar+design,+treble&source=bl&ots=rDRFc67IUR&sig=B6weUTsdw08ibGW__8VHdWtXiRo&hl=en&sa=X&ei=_lRIVK_ODNGhyATZgIKoDw&ved=0CEMQ6AEwCA#v=onepage&q=guitar%20design%2C%20treble&f=false|this article].
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