Revel F12 - Manual (Page 11)

11 REVEL Concerta F12
Owner’s Manual
Listening Room Acoustics
(continued)
1. Surfaces and other boundaries often
cause large peaks and dips in low-
frequency extension. These peaks and
dips often range 12dB or more.
2. Standing waves (also known as room
modes or resonances) interact with
both the loudspeaker and the listener,
resulting in large frequency response
errors.
Unfortunately, there is no simple solution
that considers both factors. Even computer
software programs that examine one or
both factors may not calculate proper
primary listening position or loudspeaker
placement values.
In most cases, proper selection of the
primary listening position combined with
proper placement of the loudspeaker can
still result in superior performance at lower
frequencies. The difference between superior
and inferior results is often just a small
adjustment of the primary listening position
or loudspeaker placement. If you have
questions, contact an authorized Revel
dealer for assistance.
Acoustic Treatment Materials
The F12 features high-order filters at 575Hz
and 3.0kHz that optimize loudspeaker on-
axis and off-axis response, minimizing
degradations that occur in overly “live”
rooms. Placing minimal acoustic treatment
materials at primary reflection points will
reduce these distortions even further.
Ideally, acoustic absorbers should be
placed at the first reflection points on the
front and side walls and either acoustic
absorbers or diffusers should be placed at
the first reflection points on the rear wall.
Because the listener’s eyes and ears are on
the same plane, the “mirror method” is an
accurate determinant of critical reflection
points. This method can be used to determine
reflection points for side walls, rear walls,
front walls, and even the ceiling. Applying
acoustic treatment materials to the side
walls is most important, followed by the
front wall, rear wall, and ceiling.
To determine reflection points using the
mirror method:
1. Once the F12s have been placed, sit in
the primary listening position.
2. Ask another person to slide a mirror
along the listening room walls.
3. Note the locations at which the person
sitting in the primary listening position
can see either F12. Be sure to look for
both F12s in the reflection on each
room boundary. These are reflection
points that require acoustic treatment
materials.
If acoustic treatment materials are not
available, hanging a rug over the reflection
points will help to reduce degradation in
overly “live” rooms. Carpeting the floor
between the loudspeakers and the primary
listening position and placing irregular
surfaces such as bookcases at first reflection
points will also help minimize strong
reflections.
FEET AND OPTIONAL SPIKES
When shipped, rubber feet are attached to
the bottom of the cabinet for optimal
stability, accommodating installations on
tile and hardwood floors. The F12 is shipped
as shown on the left side of Figure 7 (next
page).
Note
When moving the F12, avoid dragging it
across the floor, as this will damage the
feet, the spikes, and/or the wood cabinet
itself. Always lift the F12 and carry it to its
new location
Four metal spikes are included for use
when the loudspeaker is placed on carpet-
ed floors.
Insert the spikes into the threaded inserts
at the bottom of the feet as shown on the
right side of Figure 7 (next page), so that
the spikes protrude from the cabinet.