Von Schweikert Audio
World Class Reference Speaker Systems for Music and Film
VR-4SR Mk II
generation IV
he VR-4 SR Mark II is the fourth generation of the
VR-4 series. It is a two-piece stacking speaker
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system utilizing the world’s finest cabinet design: a timealigned, decoupled sat/sub for incredible tweeter,
midrange, and woofer transparency, as well as
unparalleled soundstage reproduction. Clarity is
enhanced with Low-Distortion drivers with the best
available Transparency Factor. The engineering target
was to design a highly accurate, laboratory-grade system
with the ability to be used as a professional reference
monitor. Studios using VR-series include Sheffield
Labs, Musical Fidelity Sound Labs, A&M Records (Herb
Alpert), and Walt Disney Studios (Alan Menken, winner
of 7 academy awards). Many recording engineers
brought these speakers home, including Robert Harley,
now editor of TAS, and Herb Alpert, creating an
audiophile demand. A reference monitor must have wide
bandwidth, low distortion/coloration, with convincing
three dimensional depth and realistic sound staging. The
VR-4SR is highly optimized for this use and is highly
musical as well. Imaging and depth are state-of-the-art
due to our proprietary Ambience Retrieval System
Global Axis Integration Network.
Virtual Reality design emphasizing four dimensions of
sound reproduction:
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“VR-4 ” indicates a
and
1. Amplitude: A speaker system used for reference
monitoring must meet a +/- 1dB tolerance level;
2. Phase: Consistent phase between drive units
and slow rotation is desired; no out-of-phase
drivers;
3. Time: The drive units must be time coherent in
the ear’s sensitive 3ms range;
4. Space: The speaker design must replicate a
palpable three-dimensional sound stage with
The elegant book-matched wood veneer two-piece
stacked cabinetry is built to the highest level of
professional build quality and includes a new
bracing/damping system that enables incredible
transparency and the total elimination of coloration. The
baffle is 2” thick and all cabinet walls are 1” thick and
internally lined with thick acoustic felt and foam. Twin
8.5” aluminum woofers reproduce the bottom octaves
with authority and clarity, using a modified triplechambered transmission-line to achieve response flat to
20Hz. Our hybrid bass loading system utilizes a 7” wide
flared vent, front-mounted to allow close placement to a
wall in small rooms without boom or coloration.
Unquestionably the most impressive and dynamic 20Hz
bass system available!
We have utilized a 7" composite cone midrange driver
with incredibly flat frequency response and low
distortion, the same driver that is also used in our
flagship VR-11SE. The cone is fabricated from carbon
and Kevlar impregnated cellulose acetate pulp, using a
ceramic liquid binder, with a surface coating developed
in the aerospace industry called Aerogel to damp the
stored energy waves. This high tech composite cone has
a remarkable Young’s Modulus (ratio of stiffness to
weight), allowing incredible transient speeds up to 6,000
cycles per second without distortion of timbre or phase.
This new midrange driver has greater clarity and
dynamic range than our reference electrostatic speakers!
Our tweeter is possibly one of the world’s finest drivers,
with the highest level of clarity and detail combined with
a very smooth, lush sound quality due to the Low
Distortion Motor design. The diaphragm is composed of
silk and arranged in a dual concentric ring configuration
with a clamping phase plug. This enables the tweeter to
reproduce stunning detail without added harshness or
distortion that typical dome tweeters exhibit.
In order to duplicate the depth and air space of the
concert hall, we have developed a dipolar rear
mid/tweeter and ambience derivation circuit complete
with Dimension Control for effects level. This completes
a 360-degree spatial image with virtual realism!
depth.
Von Schweikert Audio
World Class Reference Speaker Systems for Music and Film
Specifications
System Type: Dynamic-driver four-way system
using a triple-chambered transmission line and twopiece stacking enclosure system to eliminate
resonance and ensure image focus.
Woofer Tuning: The triple-chambered
transmission line is a hybrid design composed of
three separate chambers coupled to the room by a
tuned vent at 23 Hz. The chamber filling is
acoustic foam and Dacron. The 4"-wide vent tube
with 7” flare extends bass response without the
"one note bass" problem found in other ported
systems. Dynamic range is incredible due to the
large amount of low frequency air movement.
Cabinet and Bracing: A two-inch thick front
baffle provides exceptional vibration control and
image solidity, while one-inch MDF fiberboard
interlocking braces provide exceptional rigidity and
freedom from boxy colorations. The internal
damping consists of thick acoustic felt and foam
lining with Dacron stuffing to eliminate cavity
resonances. Large carpet spikes are provided.
Size: Midrange/Tweeter (14"h x 11”w x 24"d).
Woofer (29"h x 11"w x 24"d). System (44"h x
11"w x 24"d).
Weight: Woofer module: 97 lbs. M/T module: 53
lbs. System: 150 lbs. each.
Driver Complement: 2-8.5" aluminum woofers
from Norway, 1-7” carbon Kevlar-cellulose
Aerogel midrange driver from France, 1-1.5” silk
dual concentric ring tweeter from Denmark, 1-1”
rear firing ambience mid/tweeter with fabric dome
and transmission-line loading from Denmark. All
drivers use our proprietary Advanced Motor System
with low distortion design.
Crossover: Acoustic fourth order, at 190 Hz and
1.9 kHz, optimized for flat off-axis response and
phase consistency over a wide Global Axis. Very
high quality parts are used from France, Germany,
and the U.S., including Hovland film and foil
capacitors, Solen film-foil capacitors, Solen perfect
lay inductors, film-foil resistors, and Analysis Plus
internal wiring.
Binding Posts: Double sets of five-way rhodium
posts enabling bi-wiring. Single wire can be used
with optional Data Link connector.
Ambience Driver: 1” treated fabric dome with
Wave Guide and transmission-line rear wave
loading. Ambience circuit uses Dimensional
Control (effects level) to compensate for room
acoustics and soundstage depth. Provides a Global
Axis polar response pattern to simulate live musical
reproduction.
Frequency Response: 20Hz-25 kHz, +/- 3 dB, 18
Hz-40 kHz –6 dB, (+/- 1dB at midband).
Impedance: 6 ohms avg. (4 ohms 20 Hz-150 Hz; 8
ohms 150 Hz-20 kHz).
Recommended Power: 20 watts up to 500 watts
music power.
Sensitivity: 92 dB @ 1w/1m using 2.83V.
Warranty: Ten years Parts and Labor, excluding
burned voice coils due to amp clipping. Warranty
is transferable to second owner.
Finishes: Available in four book-matched wood
veneer finishes including African Hazelwood, Dark
Red Cherry, Sycamore, and Ebony wood. A satingloss polyester resin clear-coat protects the fine
wood surfaces.
Made in the U.S.A
.
Von Schweikert Audio
930 Armorlite Drive
San Marcos, CA 92069 USA
(760) 410-1650 Fax 410-1655
Website:
www.vonschweikert.com
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