No single piece of your sound system will outperform well-engineered
room acoustics. JSX specializes in small and professional room acoustic
design with passive and electronic devices. Jerry Steckling, the Chief
Technology Officer of JSX, has pioneered methods for active absorption
and the taming of natural eigenmodes.Many researchers have found eigenmode
analysis to be a useful tool because of its ability to reveal correlations
and patterns in the spatio-temporal distribution of events. Small rooms
usually don’t provide the real estate to completely attain full
passive control over basic modes, even if even distribution is attained.
The nature of recording rooms, critical listening areas, and home theaters
is complex – even when considerable care is taken to treat these
sound environments, the eigenmodes can no longer be predicted with standard
These events are oftentimes comprised of a series of underlying events
that overlap one another, and cant’ be tracked with a tape measure
and calculus functions. Each wall, floor, ceiling surface, and membrane
exhibits its own “transfer function,” and each of these objects
are not complete reflectors.
If each surface now has its own resonances, the complex nature of each
one is an overlay on the total response of the room. If each surface was
made of basic sheetrock and stud construction, you would conclude that
each would exhibit a certain value of resonance or absorption. However,
in most cases, the user has installed diffusing and absorbing devices
on those surfaces, which changes the predictable transfer function.
Most complex room cavities need to be measured. Tracking mode effects
and their locations can reveal the activity of certain architectural details
with respect to the mode patterns. Only then can mode control be applied.
The mode patterns of a typical listening facility can be categorized from
most to least dominant; these pattern specifications can’t be predicted
by the linear eigenmode equations.
When approaching eigenmodes problems (and some are not problems) Typical
off the shelf acoustic devices are only effective down to the mid 100s
of Hertz. The dominant mode effects below this will often be the wall
rigidity, mass, dimension and thus resonances.
An even distribution of mode effects is only part of the desired overall
response. The dampening time, the and the centering of the various mode
frequencies will also play a large roll in the musicality of the system.
In difference the spatial response in rooms is dominated by room dimensions,
speaker placement, the placement of acoustic features and devices and
listener placement. Much of this science is not completely subjective.
The rules that govern the spatial purity of a room are often psycho-acoustic
in nature. The localization of sources are often mapped from previous
experiences. Key spatial cues can be masked or revealed by the treatment
of especially near surfaces.
Near and far surface treatment techniques should follow basic time domain
psycho-acoustic conventions.Jerry Steckling has been working in the area
of electro-mechanical control of room mode response as a passion for over
18 years. He has been professionally effective in small room acoustics
for high-end listening environments and is an expert in sound field management.