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A good reference material from Linkwitz
The best rooms ...
The best rooms are at least 15 feet wide, 20 feet long and have a ceiling height of 8 feet or more. This allows the two loudspeakers of a stereo system to be placed symmetrically and with their tweeters at least 3 feet from side and rear walls. With the loudspeaker tweeters 8 feet apart the sweet spot is located on the room symmetry line and at 8 feet from left and right loudspeakers. This leaves more than 9 feet behind the listeners for the sound to travel before it is reflected back. It is very important for balanced phantom image creation that the immediate vicinity around the two loudspeakers is symmetrical.
Rooms can, of course, be much larger than 15 x 20 x 8 feet and with the loudspeakers much further than 3 feet from the walls, but the optimum listening distance for phantom imaging remains equal to the loudspeaker left-right separation or up to 1.5 times that value.
Room construction can vary widely, which tends to affect low frequency reproduction and sound transmission to and from the neighbors. You take what you get and try to correct one or two frequencies if necessary. But, if the room is pleasing to live in, to have a conversation or to relax, is neither a dungeon nor a stuffed pillow, then it is also suited for accurate sound playback. The room should be furnished, have irregular hard surfaces, books and shelves for sound diffusion, rugs, pillows and soft surfaces for sound absorption at higher frequencies. Just keep it lively. The best loudspeakers will make you forget the room, if the room talks back from all directions in the same familiar voice.
Actually, the loudspeaker is the problem
The room is usually considered to be the problem when a loudspeaker does not sound right. Actually, the loudspeaker is the problem, because it illuminates the room unevenly with sound at different frequencies. The room merely talks back and the listener's brain cannot withdraw attention from it. Room correction will make the loudspeaker sound different but it cannot fix its off-axis frequency response, which is heard via the room.
Below you will find a lot of theory that you can safely ignore, because your room is most likely not one of those ideal cases that can be described mathematically. No one can tell you the right room proportions, though many have and are trying. Listening rooms in the home are much more difficult to understand and describe than concert halls, because their acoustic size varies from being small compared to a 56 foot wavelength at 20 Hz, to being very large at 10 kHz with 1.3 inch wavelength. Concert halls are acoustically large even at the lowest frequencies and thus easier to analyze and they have been studied extensively. Even so, concert hall design is still a blend of art and science. For your listening/living room design and layout follow the simple guidelines above and forget what you read about 1/3rd rules, costly room treatment products, magic wood blocks, etc. and use appropriate loudspeakers. |
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發表於 2011-11-26 16:02:58
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