BC: Primacoustic Razorblade Diffusor.
RazorBlade Quadratic Diffuser
BC Canada - Primacoustic, (The acoustical division of J.P. CableTek
Electronics Ltd) is pleased to introduce the RazorBlade broadband quadratic
is designed to control primary reflections and reduce standing waves
by scattering acoustic energy while retaining a more natural ambient
sound over absorptive panels. The result is a sense of greater space
and openness, while expanding the 'sweet-spot' in the control room.
to company president, Peter Janis: "Our goal in developing the
RazorBlade was to provide full bandwidth diffusion yet be affordable.
Unfortunately, there is no shortcut to this dichotomy: To diffuse bass,
because of the longer more powerful wavelengths, you need depth for
¼ wavelength calculations and one must introduce sufficient mass
and stiffness so that the energy does not pass right through or set
the diffuser into vibration. Lightweight polystyrene or plastic diffusers
are only effective in the upper strata but do nothing in the bass. This
is why speaker cabinets are built out of high-density wood and we employ
multiple layers of sheetrock when building studio walls. Furthermore,
to achieve smooth high-frequency diffusion, the design must integrate
many slats in order to properly address the smaller wavelengths."
"Bigger, deeper, with more slats unfortunately equates to a higher
cost from the outset. This meant that we had to find a way to shave
manufacturing costs in order to hit our desired price target. We figured
that if we could automate the process by using numerically controlled
routers and saws, and build enough of them to take advantage of the
volume savings, we could produce a high performance product that was
not only better than anything on the market, but was also sufficiently
affordable that this type of diffusion technology could gain general
appeal. The response has been nothing less than overwhelming!"
is a true quadratic diffuser whereby a precise series of different wells
are spread across a wall plane and mathematically calculated to break-up
and scatter acoustic energy at all frequencies within a given bandwidth.
Effective from 350Hz to 10kHz, the RazorBlade features sixteen wells
of solid MDF construction for maximum density and deflection at all
frequencies. All slats feature 'dado, dowel and glue' construction for
maximum stiffness, while eliminating any chance for rattle or self-noise.
primarily intended for studio control rooms, the RazorBlade may be used
in all construction including soft-seat theaters, auditoriums, home-theater,
in fact any room that requires acoustical control of the ambiance.
the RazorBlade is mounted at the 'receive' end of a room, behind the
engineer whereby direct energy from the speakers is scattered in a random
fashion. Space permitting, the RazorBlade may also be used on the ceiling
or on sidewalls for greater control. Used in conjunction with Primacoustic
foam, The RazorBlade provides a complete acoustical solution for any
measures 24" wide, 48" high, and is 8" deep, and is available
in choice of black or primer coat for painting. For more information
contact Primacoustic, #114\-1585 Broadway, Port Coquitlam, BC V3C 2M7
Tel; (604) 942-1001 Fax; (604) 942-1010 or visit www.primacoustic.com
the RazorBlade 8" deep?
All frequencies have a given wavelength and these all have a given size.
Using quarter wavelength calculations, 8" of depth will diffuse
a 32" wavelength or 410Hz. Due to the angle of incidence, and acoustic
by-products such as 'lensing', we can often achieve a further doubling
of the low frequency performance and reach down to 205Hz. To be safe,
we specify the RazorBlade to be effective to approximately 350Hz.
only high frequencies were directional?
The higher the frequency, the shorter the wavelength, the more directional
they become. This is why in PA systems we use wave-guides or horns to
direct high frequencies. Conversely, bass is omni-directional and is
why sub woofers can be placed just about anywhere in a room. The lower
the frequency, the more difficult it is for the ear to localize. Diffusers
like the RazorBlade are designed to help us manage directional frequencies,
which generally begin in the 300Hz region.
the RazorBlade so heavy?
To absorb energy, you need a soft, porous substance like acoustical
foam or fiberglass. To reflect energy, you need a hard and extremely
rigid material like wood or concrete. To stop sound, you need mass like
sand or lead so that the energy does not pass through. To reflect energy,
the device must hard, dense and heavy or it will have not appreciable
the RazorBlade made with different well depths?
A sound entering the wells will enter at a given moment in time. The
different well depths are calculated and spread in such a way as to
delay the energy as the sound is reflected back into the room. Deeper
depths allow lower frequencies with longer wavelengths to be broken
up while more separations or slats are needed to affect the higher frequencies.
RazorBlade be painted?
The RazorBlade is available in two finishes: Black for those that simply
want to buy the unit and put it on a wall and off-white primed for painting.
This allows the studio designer to match a color for room décor.
Can I order
a custom color or finish or maybe a special wood?
No, not at this time. In order to get the cost down, we have to mass-produce
the RazorBlade. This unfortunately limits the selection.
RazorBlade be mounted on its side?
Yes. The RazorBlade is designed for the wells to be positioned in either
the horizontal or vertical plane. Most studio control rooms are wider
than they are high. This advantages the placement with the slots in
a vertical position whereby the energy will be scattered across the
room as opposed to up and down.
RazorBlades do you need in a given room?
Using vector calculations, one normally will extend at least the width
of the console at above the 32" mark. On a typical 8ft wall, this
leaves 16" to the ceiling, which is often coated with absorptive
materials. In larger, wider rooms, one will try to treat about 75% of
the width with diffusion, centered behind the engineer.
most project studios only use acoustical foam for treatment?
Price. Up until now, the only viable option available was either very
expensive or simply was ineffective. RazorBlade is in fact arguable
better than any other commercially available diffuser and is extremely
affordable. At $250US, one can easily afford to invest $750 to $1000
into a room to get real diffusion.
RazorBlade available at any music store?
No. RazorBlade is only available at authorized Primacoustic shops. These
tend to be the high-end professional stores where the staff is educated
and can assist the client in making the right decision.
information, please contact Primacoustic #114-1585 Broadway, Port Coquitlam,
BC V3C 2M7. Tel: 604-942-1001 Fax 604-942-1010
for press releases and downloadable image sets.