neodymium magnets. It also employs
a unique suspension to maintain
linear response by holding the voice
coil in linear regions of the gap.
However, even this exceptionally
powerful woofer could not realize the
ambitious goals of the X-10 without
the highly evolved technology of
PSAC (Pressure Sensing Active
Control) . PSAC was developed by
Meyer Sound based on sophisticated
feedback technology that was
originally implemented in hydraulic
control systems for Stealth fighter
aircraft. PSAC employs a pressure
sensing device, placed one inch
in front of the woofer, to track
momentary driver output pressure.
This data feeds into the PSAC
"black box" which compares it to
the input signal. Using computer-
modeled, high-order correction
circuits unavailable a decade ago,
PSAC adjusts the feedback circuit
output–microsecond by microsecond–
and brings the two signals into
virtually perfect alignment. The result
is unprecedented linearity and
precise resolution of low-mid detail
that is usually muddied by
conventional woofers when heavy
bass transients move the voice coil
into non-linear regions of the gap.
The product of over two years
of development in Meyer Sound's
anechoic chamber, the X-10 high
frequency system marks a significant
achievement in the coordinated
design of extremely low distortion
driver and waveguide – both
patented. (The X-10 system
measured significantly lower
distortion than all other units tested
in an extensive analysis of horn/
driver combinations from dozens of
manufactureres.) The X-10 also lacks
the characteristic "horn signature"
of previous similar designs; many
listeners find that the exceptionally
smooth, open response compares
favorably to HF systems employing
soft dome tweeters. The compression
driver, Meyer Sound's own 2010,
features a 4-inch aluminum alloy
diaphragm with optimized dome
topology for higher output levels
1 Maxwells are the product of gauss times area.
X-10s near-perfect impulse response2
Amplitude
Time Window (miliseconds)
0.6
0.4
0.2
0.0
-0.2
-0.4
-0.6
-7 -6 -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +6+5 +7
A typical electrostatic loudspeaker’s impulse response
Amplitude
Time Window (miliseconds)
0.6
0.4
0.2
0.0
-0.2
-0.4
-0.6
-7 -6 -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +6+5 +7