AAD 7001 Owner's Manual - page 7
1-6
To illustrate this concept, think of the room as a small box. If the box is made of cardboard,
the walls vibrate easily. The same box made of concrete would exhibit little movement.
Diaphragmatic action dissipates low frequencies, robbing the bass of both impact and
extension.
Therefore, the more rigid/massive walls, floor and ceilings are in your listening room, the
less diaphragmatic action and the tighter, more defined and powerful the bass will be.
Comb filtering
This is another form of unwanted reflection. This condition is created when a speaker is
placed near a reflective surface (wall, floor, furniture etc.). The result is image smear and/or
frequency response anomalies. The comb filter effect occurs when the direct sound and the
reflected sounds arrive at the listeners' ears out of phase, thus canceling each other. This
problem can be avoided by placing your speakers well away from reflective surfaces, or by
treating nearby problem areas with absorptive and/or diffusive materials. For best results
keep the 7001 speakers at least 3 feet away from side walls.
The Listening Position
For best results the listening position should be about 1/3 of the length of the room from the
back wall and should be equidistant from the side walls. It may be necessary to have some
form of acoustic control in the proximity of the listening position. For example if you have a
wood floor, it may be beneficial to have a thick rug placed in front between you and the
speakers. This can control some of the unwanted reflections from the floor causing
interference on the mid and high frequencies. Experimentation with moving your listening
position may be necessary to find the best location.
Playing your 7001 speakers
Running In
Like a new pair of shoes, high-performance speakers need a break in time. Out of the box
your 7001s will not be optimum. They will need a period of time for the sound to mature to a
full bodied, smooth, sweet sound. The speaker's acoustic tuning is based on a fully run in
unit. It would not make sense for the speaker to sound its best out of the box and then go
downhill from there.
In fact the 7001s will not only improve over a short break in time but will continue to
improve on a daily basis and this will go on and on for as long as you own these speakers.
There is simply nothing to fail or wear out in them. Given care they deserve, these speakers
will last a lifetime.