RX5-HF Recoil Stabilizer - Flat Monitor Isolation Pad (Single), RX5,
Primacoustic RX5 Recoil Stabilizer Monitor Isolation Pad Details
Primacoustic Recoil Stabilizer is a unique speaker mounting device that
at once eliminates disruptive resonant coupling from the loudspeaker to
the stand, while providing a stable base that reduces the recoil caused
by the forward energy of the loudspeaker motion.
from three basic components, the Recoil Stabilizer is essentially a
platform for the loudspeaker that features a high-density urethane base
that isolates the speaker from the shelf, monitor-bridge or stand. This
effectively decouples the loudspeaker to eliminate vibration-borne
resonance to the substructure. A heavy laser-cut steel plate is added
and sandwiched between the isolation layer and a no-slip neoprene top.
The steel plate introduces significant mass to the structure and serves
to stabilize the speaker.
reducing the backward 'recoil' energy as the speaker coil pushes energy
forward, initial waveform transients no longer suffer lag and the
sharpness of the resulting pulse is more defined. The result is
significantly greater detail at all frequencies, with tighter bottom
end and improved depth of field.
Recoil Stabilizer is available in various sizes and weights to address
different speaker designs and may be ordered in both standard and
custom angles to precisely aim the loudspeakers for critical listening
How It WorksBefore
we get into how the 'Recoil' works, it is worth understanding some of
the scientific principles involved and what problems are actually being
Sound travels through air and other mediums in waves.
These waves compress at various frequencies called the wavelength.
Longer wavelengths tend to travel further while shorter ones travel in
a more direct line. Longer wavelengths require more energy to generate
and once in motion, are very difficult to contain. With sufficient
energy, long wavelengths will cause walls and floors to vibrate.
Thunder shaking your house is a very good example of lots of energy
applied to a low frequency.
Ok, so what does this mean in human
speak? Simply put, bass travels through just about anything while high
frequencies are fairly simple to control. And has all of this got to do
with near field monitors or reference loudspeakers? Those speakers
produce bass and bass will transmit through the speaker stand to the
floor, the walls and whatever is connected. This is called acoustic
coupling. When sound vibrates in the speaker stands, they resonate and
produce unwanted sound. To sum up, coupling causes a frequency bump at
the resonant frequency which in turn changes the speaker's performance.
solve the problem, engineers often employ urethane foam pads or other
insulating materials under their nearfield reference monitors as a
means to eliminate the resonance that occurs when the speaker and the
speaker stand, (shelf or monitor bridge) couple. Good news: this does
in fact effectively decouple the two devices. Bad news: it introduces a new problem that is best described as recoil.
of a riffle firing a bullet. The hammer strikes the firing pin which in
turn causes the shell to explode, propelling the bullet forward. As the
bullet pushes forward the rifle recoils backwards to absorb the energy.
This is exactly what is happening when you place your speakers on a
soft, spongy material; during a transient such as a sharp kick drum
thump, the forward momentum of the speaker is dulled by foam as the
soft malleable substance allows the speaker to tilt backwards and
recoil. This 'recoil' may be desirable when firing a rifle, but with a
loudspeaker, the movement dulls the initial transient at the start of
the wave, and the result is predictable: you lose clarity and detail.
What we really need is to both decouple the source and provide a stable platform.
Recoil Stabilizer solves the problem by introducing a heavy mass on top
of a high-density urethane isolation pad. By significantly increasing
the mass of the base platform, the loudspeaker's forward momentum is no
longer sufficient to move the platform backwards. It is stabilized and
the recoil is significantly reduced.
If you think about it, this
is exactly how a gyroscope works. Gyros are used in airplanes,
torpedoes and missiles to stabilize the navigational system so that the
device stays on course. By rotating a heavy mass very quickly (like the
earth around itself - around the sun!) the centrafugical force retains
the gyro's position relative to all axes. Since we need only control
the effect from the speaker excursion in a single axis (front to back)
we do not need a centrafugical force to steady the device, we can do
the job with a simple, heavy steel platform that acts as the
This heavy platform is in turn, sandwiched
between the isolation pad and a non-slip neoprene layer. This works
double duty by providing the speaker with a comfortable resting place
on which to sit while also working in symphony the bottom urethane foam
and mass of the speaker to dampen the steel plate. To further reduce
self-resonance, a curved front panel aids in the process by varying the
impedance thus eliminating internal standing waves. This also adds more
mass without increasing the footprint.
A wide range of Recoil
Stabilizers is offered to adapt to various loudspeaker manufacturer
offerings. This includes smaller recoils for compact monitors like
Auratones and larger recoils for midfield monitors and sub-woofers.
After many listening tests, we have found that a 4:1 ratio appears to
work well whereby the mass of the Recoil should equal 25% or more of
the loudspeaker being used
Recoil Stabilizer Specifications
The Recoil Stabilizer is a nearfield
monitor platform that incorporates
four different elements to create the
whole. This includes:
- Isolation foam
High density open cell acoustic foam provides acoustic isolation to eliminate coupling between loudspeaker and shelf.
- Steel platform
Laser cut ¼” (6mm) steel platform adds the necessary stabilizing mass to rigidly hold the nearfield monitor in place.
- Curved front panel
Curved front panel eliminates standing
waves and adds mass to the platform
without increasing the footprint.
- Retention pad
Thin no-slip neoprene surface ecures
the nearfield monitor to the top surface
for maximum signal transfer.
Recoil Stabilizers are available in a variety of sizes and
weights to coincide with various monitors being produced today. We have
produced a cross reference chart to help you select the right Recoil Stabilizer for your monitors.