Bowers & Wilkins PM1 Manual De Instrucciones página 7

4. Fine Tuning
Before fine tuning, double check that all the connections in the
installation are correct and secure.
Moving the speakers further from the walls will reduce the general
level of bass. Space behind the speakers also helps to create an
impression of depth. Conversely, moving the speakers closer to
the walls will increase the level of bass and potentially reduce the
impression of depth.
If you want to reduce the volume of bass without moving the
speakers further from the wall, fit the foam plugs or, for less
severe bass reduction, the foam rings in the port tubes (above).
If the bass is uneven with frequency, it is usually due to the
excitation of resonance modes in the room. Even small changes
in the position of the speakers or the listeners can have a
profound effect on how these resonances affect the sound. Try
positioning the speakers along a different wall. Even moving large
items of furniture can have an effect.
If the sound is too harsh, increase the amount of soft furnishing
in the room (for example, use heavier curtains), or reduce it if the
sound is dull and lifeless.
Stand in the middle of the room and clap your hands to check
for rapid 'flutter' echoes that bounce between parallel walls. They
can colour the sound, but may be dispersed by using irregular
shaped items such as bookshelves and pictures on the walls, or
absorbed by adding carpets or rugs to hard floors.
For the most discerning listening, remove the bass/midrange
grilles by gripping around their edges and gently pulling them
away from the cabinet.
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