Hafler VRM 10S User Manual - Introduction
– 1 –
The VRM10s/VRM12s/VRM15s monitors utilize a specially designed amplifier featuring our innova-
tive Trans•ana circuitry. This topology, with its unique input-to-output configuration (derived from
our patented Trans•nova circuit), employs power gain in the MOSFET output stage that result in
superior sound quality.
The amplifier features an auto turn-on/off circuit that eliminates the need for a conventional power
switch. Input signals can be fed into the amplifier via Un-Balanced RCA jacks or Speaker level input
jacks. Each pair of inputs is combined into a mono-summed signal before being fed into a 4th order
Linkwitz-Riley low-pass crossover, adjustable from 40Hz~140Hz. If selected, the signal is then fed
into the Phase Control that allows the phase of the signal to be adjusted at 90˚, 180˚, or 270˚ incre-
ments.
The VRM10s is a 10” (254mm) low frequency transducer that features a 2” (51mm) voice coil and is
driven by a 30 oz. magnet. The VRM12s is a 12” (305mm) low frequency transducer that features a
2.5” (63.5mm) voice coil and is driven by a 102 oz. magnet. The VRM15s is a 15” (381mm) low fre-
quency transducer that features a 2.5” (63.5mm) voice coil and is driven by a 153 oz. magnet. All
VRM transducers feature Cellulose Fiber cones for accurate sound reproduction and Santoprene
Rubber Surrounds that are immune to temperature fluctuations. This specialized rubber surround
controls woofer damping and reduces 2nd harmonic distortions for a very wide and flat frequency
response. The VRM series voice coils are 4-layers of copper wound on aluminum formers.
Aluminum voice coil formers provide excellent heat dissipation that provides higher power handling
versus plastic or Kapton type formers used by other manufacturers.
Introduction
Technical Design Features
T
hank you and congratulations on your purchase of the HAFLER series of Subwoofer, the world's
finest brand in professional audio equipment.
The VRM series is comprised of three modules; the VRM10s, VRM12s, and VRM15s. The VRM10s
is an amplified 10" subwoofer. The VRM12s is an amplified 12" subwoofer and the VRM15s is an
amplified 15" subwoofer. All VRM series are designed and engineered for Home Theater Systems.
For ease of use, this manual is organized into two main sections: Installation and Operation.
"Installation" covers the set-up of your new HAFLER equipment in the system. "Operation" covers
the controls and how to use them for optimum performance.