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Recent research into the behavior of rooms as a function of speaker placement has
concluded that – if you have the freedom to do so – there are significant
advantages to placing several smaller subwoofers around the room, rather than
relying on a single large woofer. Moreover, the optimum placement is usually
centered on each of the four walls, or deep in the corners of the room. If you have
the luxury of doing so, this simple placement strategy can reduce the size of the
room’s response irregularities from 20 decibels down to perhaps as little as 6-8
decibels – a tremendous improvement.
Room Treatment
Rectangular rooms have six reflecting surfaces (four walls, ceiling, and floor)
that reflect sound to the listener, after various delays introduced by the indirect
routes the sound take on their way to the listener. These first reflections are
particularly damaging to sound quality. Looking at the simplest case of stereo
reproduction, you have a minimum of
twelve first reflection points in your room
that deserve some attention.
Unfortunately, it is often difficult to do much about the ceiling and floor reflections,
even though they are arguably the most destructive. (The minimization of these
reflections is one of the strongest arguments for the tall, line source loudspeakers
that Wisdom Audio builds.) This leaves you with eight “first reflections” that you
should consider minimizing somehow. These points are easily found by having an
assistant slide a small mirror along the four walls of the room, while you sit at the
listening position. Any place on the wall where you can see a re- flection of
any
speaker is a first reflection point. Concentrate on the first reflections for the Left and
Right speakers first.
If you can, arrange to apply either absorption or diffusion at these eight points
(don’t forget the wall behind you). Absorption can be as simple as heavy, insulated
drapes; diffusion can be provided by a well-stocked bookcase with books of varied
sizes. Alternatively, you can buy purpose-designed room treatments (some sources
listed under References, below).
The important things to remember are these: a good room should have a balance of
absorption and diffusion; and if you are going to treat only a few areas of the room,
the first reflection points are the most important ones to treat.