Room acoustics, Multichannel – Verity Audio Rocco User Manual

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February, 1


, 2004



the 12-inch woofer drivers should be near a boundary. Stiff
walls may allow closer proximity. Make sure the spikes are
properly installed. For home-theater systems, complete your
preamplifier/processors setup.

Once your system has been properly installed and adjusted,
should the bass sound muddy or boomy, try to move the
subwoofer twelve inches toward the room center. Readjust
your setup and repeat until you get a good performance.

While keeping the same distance with the rear or front wall,
you can also move the subwoofer step-by-step away from the
side wall. It should change the bass tonal balance without
lowering the bass strength.

Your Rocco subwoofer is a refine audio product that will
highly benefit from the care and attention invested in the setup.
We recommend starting with the above recommendations. The
more familiar you will get with your Rocco and its integration
with your system, the more you will develop the knowledge
and skills to better optimize your system. Your efforts will be
rewarded in creating an awe-inspiring performance.

Room Acoustics

A listening room should always be considered as an inherent
and inclusive part of any performing sound system. It is a
complex and high-order variable that has significant influence
in the overall sonic performance. The acoustic behaving of a
listening room is even more critical for low frequencies.

A room dimension sustains and reinforces a fundamental
frequency or harmonics that correspond to wavelength
multiples. Because of its length, width and height, a listening
room will exhibit several modes related to multiple dimension
combinations. It is a good practice to select room dimensions
that scatters apart the room modes. As an example, a cubic
room would create the worst conditions, as all dimensions are
equal. Acoustically, the role of a room would be to neither
cancel nor reinforce any frequency. However, most rooms will
do it in some degree. The idea is to properly control your room
by using different treatment tools.

The following definitions may be useful to identify some room
acoustic behaving:

A flutter echo is a rapid (usually regular) succession of
reflected pulses resulting from a single pulse. They can be
easily identified by tapping your hands while walking in the
room. They are frequently located at the ceiling corners or at
the center of the ceiling-wall intersections.

The room reverberation is a tendency for room sound level to
persist after direct sound ceases. The optimum reverberation
time for a room depends upon room volume, sound frequency,
and the type of sound or reproduced music.

Standing waves are reflections from opposing parallel surfaces
resulting in serious peaks in the reverberation-time / frequency
curve. In properly proportioned rooms, resonances can be
effectively reduced and standing waves practically eliminated
by introducing numerous sound treatment devices. The object
is to prevent sound reflection back to the point of origin until
after several reflections and/or after being considerably

Early reflections are the first sound reflections heard at the
listening position. They are usually intense and annoying. In
order of importance, they usually come from the floor, the side
walls and the ceiling. They can either be controlled by placing
diffusors or absorbers at their image location.

If one of the above phenomenons is prominent, please consult
your dealer to get proper assistance.


It has long been a practice for audio enthusiasts to connect a
stereo system with a television to get a better sonic
performance. From the late 70's to the early 80's two new
home-movie formats became widely available: VCR and
laserdisc. Meanwhile, TV sets got better definition and larger
screens. By 1985, both formats were improved by the
introduction of higher quality audio-video sources. But the real
surround sound as found in large theaters was not yet
available. The format density was not high enough to encode
the surround information until the DVD format was released.

Lately, SACD and DVD-A formats were lunched to offer high-
resolution stereo and multi-channel audio. A multi-channel
system designed for high-resolution audio will be excellent for
music as well as movies.

A surround sound system is dependant on complex room and
acoustic parameters. We recommend that you consult your
Verity Audio dealer to get proper recommendations and
assistance. Verity Audio dealers were carefully selected to give
you the best support.

Your Rocco subwoofer was designed to perfectly match with
the Verity Audio Tamino loudspeaker line. You will also get
outstanding results combining it with Fidelio and Parsifal. Each
piece of a multi-channel system can be purchase separately.
Take your time and buy quality components.

Following, is a brief nomenclature that outlines important
points and specifications to be considered for each of the
surround system loudspeakers.

Mains: The mains are the front left and right speakers. For
home-theater, they mostly reproduce music and surround
information. If you plan to use them also for stereo or multi-
cannel music playback, they should be high-quality. A good
practice is to use mains that go below 80Hz and reach 105 dB