Loudspeaker Stereo Setup
According
to IEC, the 2 loudspeakers should form a symmetric triangle with the listener,
with equidistant distance from the listener to either loudspeaker. The distance
between the loudspeaker and the listener should be at least 2.5m and the
distance between the loudspeakers should be at least 2m. The two
statements below can be used as guidelines for fine tuning the location of the
loudspeakers
The room
will contribute with additional coloration to the sound image other than the
recording studio. In order to minimize the amount of this coloration it is
advisable to consider the use of absorbing elements inside the room, such as
carpets, pictures on on the wall, furniture and windows.
Regarding the absorptive characteristics of common living room interior it should be
mentioned that windows act as low frequency membrane absorbers. Carpets, furniture etc.
are absorb mid and primarily high frequency components. Consider the fact that the absorption
area determines the reverberation rather than the amount of absorptive surfaces.
This effectively means that you only to a small degree benefit from carpets mounted on
the walls (instead of on the floor). Couches and other soft furnitures generally absorb more than
thin carpets!
According to IEC, the standard reverberation time inside the average european living room is 0.4 - 0.7
seconds and this is ofcourse considered by the sound
engineers during mixing of the recordings. Therefore, you should aim for this
reverberation time aswell. 0.5 seconds
of reverberation, means that the sound pressure of a white noise signal is
decreased to 1/1000 (corresponding to a sound pressure level decrease of 60dB
SPL) after 0.5 seconds.
That is a quite "dead" room in my opinion. The setup
that I use is illustrated beneath. |
The
loudspeakers are illustrated by the two square pyramids in the top of the
drawing right in front of the listener. It is often quite easy to perform an intuitive estimation of the reverberation time of a room if you are acquainted with how different reverberation times sound. I have constructed a small set of test sounds that you can playback via headphones and thereby familiarize yourself with how specific reverberation times sound. |