Von Schweikert VR-7-SE Owners manual

Von Schweikert Audio

World Class Reference Speaker Systems for Music and Film

VR-7SE

~ INSTRUCTION MANUAL ~

SHIPPING DAMAGE PAGE 2
BREAK-IN PAGE 3
INITIAL SETUP PAGE 3
ROOM CONFIGURATION PAGE 4
WIRING PAGE 6
BI-AMPING PAGE 7
PLACEMENT PAGE 7
PINK NOISE TEST FOR FOCUS PAGE 8
REAR AMBIENCE DRIVER PAGE 9
RIBBON SUPER TWEETER ADJUSTMENT PAGE 10
WOOFER TUNING/BASS RESPONSE ADJUSTMENTS PAGE 10
STANDING WAVES and “BOOM” PAGE 11
TUNING WOOFERS FOR TUBE AMPS PAGE 13
LACK OF BASS PAGE 13
CHOOSING ELECTRONICS PAGE 13
TROUBLE SHOOTING PAGE 14
ROOM PROBLEMS AND TREATMENT PAGE 15
CARE FOR THE FINISH PAGE 16
SPECIFICATIONS PAGE 17

hank you for investing in a Virtual Reality speaker system designed by Von
Schweikert Audio. The Virtual Reality design was perfected over a 24- year

T

Integration Network. Please visit our website at www.vonschweikert.com for further
technical information.

When set up correctly, the VR-7SE system can reproduce the sound of a live musical
event to an uncanny degree. However, since this model is extremely transparent, it
should be used only with electronics and cables that are transparent and neutral in tone
quality. Any coloration heard in your system is not generated by the speaker system, as
the VR-7SE is nearly a laboratory instrument. In fact, the VR-7SE is far more
transparent and neutral than most commercial recordings, although even average
recordings will allow you to hear the “magic” of the Virtual Reality Design!

period after several years of research at California Institute of Technology and
consists of Acoustic Inverse Replication and is driven by the Global Axis

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Since sound quality was our primary target, we used live musical instruments fed into
the speaker to assess its design target during the final stages of “voicing” the system.
When correctly installed, the VR Series will give you many wonderful years of exciting
musical reproduction, closer to the emotional truth of the composer, performer, and
producer’s intent. In order to fully benefit from the VR-7's powerful magic, please read
the following instructions thoroughly. Although the VR series may appear to be
conventional speakers, they have been designed to work with the listening room. Being a
Room Interactive design, there are certain setup procedures that must be followed. The
VR series are engineered to replicate the recording microphone’s signal in reverse,
allowing the original sound field to be recreated in your home. This technology is
proprietary and will allow the full emotional content of the original performance to be
heard by listeners anywhere in the room. Please see our White Paper for more technical
information on the design. As with all high tech designs, there must be a commitment
from the user to fully utilize this product. The following instructions will enable you to
achieve world-class sound.

IMPORTANT NOTE: Please read the following instructions regarding setup, as
imaging and bass response must be optimized to your particular room. Since there exists
no standard listening room dimensions or reflective/absorptive standards, each setup
will be different. A thorough break-in (250 hours) must be conducted in order to realize
the full benefits of the VR’s transparency and imaging accuracy, and several
experiments with placement must be undertaken. In situations where these instructions
are not followed, you may not achieve the ultimate sound the VR-4 can offer. Although
the VR series retail at very reasonable price points, they are capable of world- class
performance, far exceeding conventional designs. However, optimum performance is
only attainable by using the following instructions!

SHIPPING DAMAGE

Please note that the spikes are wrapped up in a cardboard box. Do not install spikes at
this time since you will be moving the speakers around extensively while determining the
correct place in the room for final installation.

After unpacking the VRs, please note any hidden shipping damage. If you find damage,
please notify the freight company who will then send an inspector. Do not discard the
boxes or otherwise alter the contents, as the inspector will want to see the damage as
you found it. Since Von Schweikert Audio has no control over the shipping companies
or their damage claim policies, it is imperative that you follow the instructions from the
freight company agent explicitly. Additionally, please retain all packing materials for
later use in the event of a move.

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BREAK-IN

The VRs use premium European drivers throughout the system. Raw drivers are broken
in for roughly 200 hours at considerable volume to reach suspension behavior’s “steady
state” prior to actual loudspeaker development. By contrast, production units receive 12
to 24 hours of break-in. Since the fluidity and dynamic range of the speaker depends on
free movement, you may notice a slight “brightness” or mechanical “heaviness” to the
sound for the first 20 hours. The sound engineered into the VRs will take approximately
300-400 hours to achieve, so we recommend that you not make critical judgment of their
sound until break-in is accomplished. Break-in is best done by playing loud music or a
break-in disc for several days straight. If noise is a problem, place the speakers face to
face, with one speaker system wired out of phase. Quilts may be placed over the
speakers to reduce the radiated sound. This trick will cancel a lot of the sound that may
disturb others. However, please make sure that you are not driving the amplifier

into clipping or distorting the speaker— it is difficult to hear distortion when quilts
are used. Adjust the volume in advance!

Note that it may take several months or longer to break the speakers in if only

quiet music is played at background levels.

Classical music played quietly does not contain enough bass or dynamics (in most cases)
to do a proper job, so we suggest using a CD player on repeat, using a loud rock album
or break-in CD as the source. Please make sure that the amplifier does not go into
clipping, though, as the heat generated may damage the drivers over a period of time.
(Clipping sounds like buzzing or harshness). If the sound is “clean”, however, you can
put 200 watts of music power into the VR-4's over a long period of time without any
damage.

INITIAL SETUP

Please do not install the spikes until the proper placement has been determined. You will
be moving the speakers several times in order to listen to different aspects of the
optimization, and the spikes will only make the movement more difficult. Since the
spikes tighten the bass dramatically, and also increase the image focus, do not worry
unduly about these two parameters until later in the setup process. Without the spikes,
the bass may be too “thick” and the image will not be as tightly focused, but these
effects will be eliminated after break-in, correct placement, and use of the spikes.

Also, turn off the rear ambience drivers by rotating their volume controls counter­clockwise until the setup is complete. Please refer to the section regarding the REAR
AMBIENCE DRIVER.

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Starting Location:

There are a number of considerations regarding initial placement, particularly involving
bass response and basic imaging. In general, bass response is strengthened when the
speakers are placed close to the rear or side walls, while imaging is enhanced by pulling
the speakers further into the room, away from walls. With your VR loudspeakers and the
following suggestions you will be able to achieve both deep and powerful bass and an
open sound stage.

ROOM CONFIGURATIONS: If you have a room with fairly rectangular dimensions,
you can place the speakers on either the long or short wall. If your room is cubic, you
will have far better results placing the speakers diagonally. See next section.

ON LONG WALL: Placing the speakers on the long wall enables you to achieve a very
large and wide sound stage. In fact, using an equilateral triangle as your starting point,
you can space the speakers as far apart as the listening distance, even if this is 15 feet.
Since the VR's have very wide dispersion, there will be no hole in the middle effect.
Place the speakers about 2-5ft from the rear wall, with this distance being the bass
optimizer. If you wish to achieve more depth, move them further into the room. If you
wish more bass, place them either closer to the rear wall or closer to the side walls.

*Note: Do not use the same distance from the rear wall and side wall, as this
distance will result in too much boost at this wavelength. Stagger this distance
by 40-70%.

Do not toe the speakers in at first, place them parallel to the side walls. In general, the
sound stage will be constrained to the distance between the speakers, so if you have the
VRs only six feet apart, you will hear a small sound stage. Since there will be a lot of
overlap between the left and right channels, the center image will be very dense and
monophonic. To correct for this, separate the speakers further; 8 feet to 12 feet apart is
not too much in a large room, but remember, the spread depends on the listening
distance. If you have to spread the speakers well apart but can’t sit far enough back due
to furniture and cosmetic considerations, you may have to toe the speakers in, with the
tweeters aimed directly at your ears.

ON SHORT WALL: Placing the speakers on the short wall and sitting far back in the
long end of the room may give you a concert hall experience if your room is large. Long
reverberation times due to long distances from boundaries can impart a ‘grand’ sense of
scale with classical music, although smaller rooms might curtail this effect somewhat.
Also, too much boundary reflection will result in echoes that may interfere with the
direct sound and blur imaging somewhat. If you suspect this condition, clap your hands
while standing at the speaker position. If you hear distinct echoes, you may have to treat
the room with specialized tuning products from Michael Green, RPG, or the like.

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If decorating is a consideration, try using rugs hanging on the side- walls at the first
reflection point, and behind the speakers, directly in the center. Your dealer can
recommend tuning products he/she carries and may be able to install them. If your
dealer does not offer this service, call the abovementioned tuning companies for further
information.

CUBIC ROOM DIAGONAL LOCATION: Rooms with mathematically repeating
dimensions (like 16 x 16 x 8', for instance) will have a mid-bass/lower midrange
‘loading’ effect due to the similar ratios of boundary distances. In this case, it will help
to locate one speaker on each side of a corner and fire the speakers diagonally into the
room. Note that you will also need to place your listening chair at a diagonal position as
well, at an equilateral triangulated distance.

Diagonal placement is an extreme measure but may be necessary if you wish to achieve
the ultimate in accurate frequency response. Diagonal placement will prevent a portion
of the standing wave energy from boosting certain frequencies, since the reflection
patterns are broken up in this configuration. The distance to each side-wall is critical,
and experimentation will be required with placement of not only the speakers
themselves, but also your seating position and wall treatment. It may be necessary to use
absorptive or dispersive devices on the wall to ameliorate the wall reflections that may
cause tonal imbalances or imaging confusion. See your dealer.

FLOORING: If you have a hardwood floor, (especially without carpeting), there is the
possibility that vibration and resonance will be transferred to the floor, which will then
act as a passive radiator. The floor resonance will sound like extra mid-bass is being
added to the sound, and will smear the bass notes as well, since the floor will vibrate
long after the woofers stop moving. On bare hardwood floors, it will be necessary to
decouple the speakers with the spikes placed on the discs or rubber decoupling feet
supplied or products such as Sorbothane by Audioquest. The use of spikes is best

suited for carpeted floors and will result in some transmission to wood floors.

In two story homes with wood floors on the second floor, we have noticed a tendency
for the floor to absorb deep bass due to sympathetic resonance. In this case, the speaker
will sound like it does not have bass, so the cure would be to either move the speakers
closer to a boundary where the floor is not flexing as much or to decouple the speaker
completely from the floor. That can be accomplished by making a platform from wood
filled with sand, or using a granite base several inches thick. In addition to the induced
resonance, there will be upper frequency reflections that will affect the midrange/tweeter
balance, usually boosting the treble/upper midrange and destroying the image solidity.
If you have hardwood floors, installing a thick rug in between the speakers and the
listening chair will normally correct this problem.

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CARPETED FLOORS: Using the spikes after break-in and correct placement will
tighten up the bass and lock in the soundstage. Make sure that you level the speakers so
they do not rock, and use the locking nuts to make sure the spikes won’t vibrate loose.

WIRING

The best sound staging and transparency from the VR-7 series results from bi-wiring the
speakers, but if a bi-wire set is not initially available, connect the main speaker wire to
the upper midrange/tweeter inputs then connect a 36" jumper wire to the woofer posts.
However, we recommend using this only as a temporary solution, since we designed the
speakers expressly to be bi-wired. When bi-wiring you have two options. The first,
when using shotgun bi-wire is to directly connect to the upper Midrange/Tweeter posts
on the upper unit and woofer posts on the lower woofer cabinet. The second is to
connect two sets of speaker cables to each set of posts and join them together at the
amplifier end.

*If you connect the main cable to the woofer and then use a jumper upwards to
the M/T you will be able to hear a slight loss of clarity, since there will now be
two connections in the signal path instead of just one to the high resolution

tweeter.
Also, make sure that you make a very tight connection between the binding post and the
spade lugs on the cables. A loose connection will be apparent as a loss of depth and
sweetness. Use a contact enhancing fluid once a month on all RCA plugs and binding
posts for best results. There will be attendant increases in sweetness, air, soundstage
depth, and smoothness equal to an upgrade in cables, but at far less cost.

Although we have tried almost ten different brands and types of speaker cables, we can
only give general recommendations due to the fact that the driving amplifier has as
much to do with the type of desired wire as the speakers. Since there are hundreds, if not
thousands of available amp/wire combinations, we are not in the position of having
heard these combinations.

However, in general, stranded wire usually has a softer, fuller sound, while solid
core wire has tighter bass. You can use these traits to “tune” the overall sound of
your system.

Please use your VR dealer’s expertise when selecting wires and cables, as he has the
experience with both the speakers and different amplifiers and can help you make an
intelligent selection.

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BI-AMPING THE VR-7 SERIES: If the tightest bass is desired, use a solid state amplifier
on the woofer modules. If you value “image float” and liquid-sounding midrange/treble
response, use a tube amplifier on the M/T’s. You will not need an outboard crossover,
since the crossovers in the speakers will still continue to work. Although it is true that
louder output can be obtained by high-pass filtering the tube amp, the loss of
transparency is usually not worth it, and the clean volume obtainable without a high­pass crossover will be usually satisfying for anyone but a metal head. (Note: if you are a
metal head, welcome to high-end audio!) You will need a preamp that has twin outputs,
but if you have only one set, use high quality Y-jacks available from your high-end
dealer.

Balancing of the volume levels when using amps with different input sensitivities can be
accomplished by outboard level controls available from your dealer at very modest cost.
If the amplifiers have input sensitivities which are fairly close, even if they are different
brands, there will be no need for level controls.

VERTICAL BI-AMPING: If two stereo amplifiers of the same brand and model are
available, try using this method of wiring. One channel will drive the woofer module,
while the other channel of the same amplifier will drive the upper M/T’s. This wiring
may sound much better than simply switching the amp to the mono-block “bridged”
mode.

HORIZONTAL BI-AMPING: If two different stereo amps are available, one amp can
drive the woofers and the other amp, perhaps of lower power, can drive the M/T’s. This
works well with large solid state amps driving the woofers, with a smaller tube amp
driving the upper end. We have heard of systems with 200 watts per channel on the
woofers, with 20-30 watts per channel of tube power driving the M/T sections. This may
seem like an imbalance, but since the most power is needed to drive the woofers, it may
work very well!

PLACEMENT

The VR-7s are Room Interactive, meaning that the VRs were designed to work in an
average listening room, not an anechoic chamber. Speakers that measure very good in an
anechoic chamber will usually sound too bass heavy and directional when placed in a
room due to boundary effects and room gain in the bass region. The bass response of the
room (boundary gain) has been factored into the VRs, along with the reflective nature of
boundary surfaces such as wood, plaster, glass, and so forth. Since the VRs are quasi­omni directional transducers, designed to be the inverse of the recording microphone,
their sound output will react with the listening room in a positive manner only if
properly placed. There are two components of sound that reach the listener’s ears:

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1. The direct arrival, or initial wave launch of the speaker itself;

2. The secondary waves, which are reflected from the room’s boundary surfaces.

The reflected sound is delayed according to the distances involved from the speaker to
the boundaries, then back to the listener. It is important for the reflected sound-field to
integrate properly with the initial wave launch, since out-of-phase reflections will
interfere with both frequency response and image focus. It is not difficult to determine
where the best placement will be in any given room, since you will be using a pink noise
listening test discussed later. See Pink Noise Test.

In every room, there will usually be more than one magic spot for the VRs to sound their
best. However, finding those spots is not intuitive, due to the nature of reverberation
characteristics and room dimensions, which vary enormously from room to room. The
VRs, being Virtual Reality simulators, are designed to load the room very similarly to
the way a live instrument would load the room. Only in this way can your ear/brain
hearing mechanism be lulled into believing that you could be listening to an actual
performance, and not simply ‘canned’ sound. If you had a grand piano at the end of the
room where the speakers are playing, it would involve the entire room with semi-omni
directional sound, and your ear/brain hearing mechanism will clearly know this. The VR
Virtual Reality design will simulate this huge sound field, with its involving depth and
dimension. However, correct placement is required to achieve the best possible sound
quality. Amazingly, moving the speaker only a few inches can make the difference
between good sound and great sound due to the reflective properties of your room! Note
that this fact is true with any speaker system.

PINK NOISE TEST TO FIND FOCAL POINT OF ARRAY: Since the VR-7 Series is
Quasi-Time Aligned by use of the specialized Global Axis Integration Network
crossover circuit and thus results in a focused phase-array driver complement, there is an
optimum seating distance. If you must situate the speakers close together, with a close
listening position for near field applications, such as in a recording studio, you may have
to toe the speakers out slightly if you find that the image is “bunched” together towards
the center. In order to find the focus point of the array, use the following technique:

PINK NOISE LISTENING TEST FOR FOCUS: Play a pink noise source such as a CD
with test tones or an FM tuner set between stations (with muting turned off). You will
notice one of two sonic effects when listening to pink noise:

1. If you are in the focal point of the array, you will hear a “ball” of noise that appears
to float between the speakers. Although noise will appear to emanate from the speakers
themselves, the center image will be stronger, with a slightly different tone quality to the
phantom center image. The sound from the speakers themselves will seem slightly
detached from the pink noise ball, and slightly softer in volume level.

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The center “ball” of sound will be very strong, and you will be able to detect that the
“ball” of sound is round, with depth to the image. This is a ‘locked in’ image with
correct focus.

2. If you are not sitting in the focal point, the noise will be diffuse, without a center
image. Although you will hear noise coming from the center, it will sound as diffuse as
the sound coming from the speakers themselves. Even though the speakers will image
music when set up like this, the imaging will be diffuse and non-localized. There won’t
be enough ‘body’ to the images, and it will be hard to hear space between the
instruments. There is a distinct lack of image focus in this situation.

To find the focal point of the VR system, move forwards and backwards slowly while
listening to the pink noise ‘ball’. You can either rock in your listening seat, or move
back and forth by several feet if you are way out of the equilateral triangle (using a
director’s chair for this works great). If you have a fixed seating position that can not be
moved due to furniture considerations, you will have to move the speakers either closer
together, or further apart, depending on the strength of the pink noise ‘ball’. If the
speakers are closer together than 8 feet, try spreading them further apart.

*Note: if the speakers cannot be separated more than a few feet due to room

considerations, as in a video application, it may be necessary to toe the speakers

outwards.

If you are placing the speakers further apart than 8 feet, try toeing them in towards you,
listening for the ‘ball’ to lock in. It really helps to have two people moving the speakers
while you sit in the listening position, giving orders. Toe-in is often critical, with only 1"
movements being very apparent. When you have found the correct spacing and listening
distance, you will immediately know it, since the image lock-in is very obvious. The
pink noise will become a very strong ‘ball’ of sound, just floating in between the
speakers. Keep moving the speakers until you hear this ball of sound. As you move the
speakers either closer together or further apart, and experiment with toe-in, you will hear
changes that enable you to know if you are headed in the right direction. It is not really
difficult, it’s fun. Of course, experimenting with several types of placement schemes is
valuable, for it will teach you how the speakers interact with your particular room. Only
by careful experimentation will you find that ‘magic’ spot for your new VR-7 speaker
system.

REAR AMBIENCE DRIVER ADJUSTMENT: The VR design has a rear-firing ambience
driver which adds depth enhancement and 360 degree timbre fill-in. When breaking in
the speakers, leave the Spatial Dimension Control all the way up in order to break-in the
driver fully. However, when optimizing the imaging using the pink noise test from
above, turn the ambience driver off by rotating the control fully counterclockwise.

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Once the speaker location has been determined, it is time to add some rear ambience.
While listening to a variety of naturally recorded music, dial in successively more
ambience, listening carefully to the change. If your rear wall behind the speakers is
highly reflective, only a little ambience will be necessary if the speakers are fairly close
to the wall. (Set control between 6:00 and 9:00 as referenced to a clock face). In some
situations, where the rear wall is highly reflective and the driving amp/cables are
somewhat overly detailed, it may be possible that no rear fill is necessary nor desirable.
If you hear ‘brightness’ creep into the overall balance, then it may be time to back off on
the Spatial Dimension Control. In a room that’s fairly dead, with soft sounding gear, it
may be necessary to use the Spatial Dimension control fully on.

RIBBON SUPER TWEETER ADJUSTMENT

The VR-7 comes with a fully adjustable aluminum pure ribbon super tweeter in order to
recreate “air” in recording playback. The factory “flat” setting is on position 5 on the
dial located at the rear of the midrange/tweeter module. The amount of volume coming
from the ribbon can be completely turned off or boosted to suit the needs of the listener
and/or associated equipment.

Do not be alarmed if you can not hear any sound coming from the ribbon

tweeter. Since this tweeter is reproducing frequencies above 19kHz all the way

up to 100kHz, most people will not be able to hear frequencies in this range.

By adding these frequencies to the balance of the speaker it opens the sound and creates
more “air” around all of the notes. In combination with the dual concentric ring tweeter,
the adjustment also allows for fine tuning treble response of the speaker to accommodate
for varying characteristics of associated equipment.

BASS RESPONSE TUNING

BACKGROUND INFORMATION: Since enclosed rooms will affect the bass response
due to standing wave formation, a woofer-tuning feature has been designed into the VR
series of speakers. Deep bass in the 20-30Hz range is highly desirable in a reference
speaker design, since hall reverberation at low frequencies is a sonic clue to both depth
and hall size. Classical music simply sounds anemic and artificial without deep bass. In
addition, the wide dynamic range found in pop and jazz recordings depends on bass
‘slam’ and efficiency at low frequencies in order to sound like a live bass instrument
such as bass guitar, synthesizer, bass drums, and upright string bass. For this reason, a
hybrid triple-chambered transmission line/bass reflex system was engineered which
exhibits both deep bass and fast transient response, with a strong emphasis on tight
bass.

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Although it is true that the measured transient response of a sealed woofer system has
less ringing than hollow cavity type bass reflex cabinets (but not the VR design), the
trapped rear wave of sealed enclosures results in low efficiency, while the compressed
air load results in sluggish transient attack. For this reason, transmission line loading has
much appeal, and makes more engineering sense, since both deep bass and fast transient
response (resulting in “tight” sound) are optimized at the same time. Bass reflex
systems, however, which are hollow (lacking 100% stuffing fill), have very unpleasant
‘hangover’ due to cavity resonance. This problem has been eliminated in the VR design
by the utilization of a high stuffing density. This technique does not work with standard
reflex woofers, or conventional Theile/Small tuning alignments, however. The resistive
damping in the form of acoustic foam and Dacron fill must be compensated in both the
driver design and the cabinet tuning ‘alignment’. All VR Series use custom designed
drivers with very high magnetic damping (low Qes) and stiff suspensions (high Qms).
The tuning ratio is derived from a proprietary over damped Theile/Small alignment with
a total Q of less than 0.6, while the woofers themselves have a total Q below 0.3.

By using an over damped alignment, maximum tightness is assured due to oversized
magnets, stiff suspensions, over-sized enclosures, and a low tuning frequency. In
addition, the mid bass rise normally associated with dual woofer formats has been
eliminated by the use of Zobel conjugate networks in the VR-4 Series woofer crossover.
The inductor coils used at extremely low frequencies have to be massive to avoid
saturation and hence are quite expensive and difficult to design. However, the extremely
clean bass response of the VR series is the direct result of engineering taken to the
extreme.

GENERAL TUNING INFORMATION: Both the volume level of the bass and the
frequency response of the woofer system can be altered easily by several methods in
order to equalize the room’s influence on the bass response. Although the VR bass
systems measure ruler flat in larger rooms that have good dimensional ratios, (using
both gated sine wave and maximum length sequence FFT signals), smaller rooms tend to
have bass anomalies and overloading problems with low frequencies due to the long
wavelengths involved.

STANDING WAVE PHENOMENA: Standing waves are dips and peaks in the bass
response caused by the room boundaries. Although many people have heard the term,
many don’t actually know what causes standing waves and what to do about them. Since
all speaker systems radiate bass almost omni-directionally, there are many path lengths
that the waves take before arriving at the listening position. Although the first arriving
bass wave will have flat frequency response, fractions of a second later the same waves
have bounced off of the front wall, rear wall, side-walls, and the floor. These
reflections both reinforce and cancel the original direct wave, depending on the wave­length vs. the path length.

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If the path length is an even multiple of the direct wave at any one given frequency, the
reflection will reinforce the first wave since it will be mathematically additive and will
cause a peak in the response at this frequency. However, if the path length is such that
the reflected wave is out of phase with the main wave, there will be a cancellation in the
frequency response. Researchers have found that the dips and peaks in the response can
be very powerful, with 18dB variances across the bass range! Note that this effect occurs
with ANY speaker design: no speaker system can overcome the law of physics.

When playing a recording with plenty of deep bass, a listener can walk around the room,
finding that every foot or two, there is flat response, a peak, or a dip. By walking around
the room, you can ‘map’ the response, finding the places where the pressure alternates
from high to low. These alternating pressure zones are a natural part of room acoustics
and must be dealt with by correct speaker placement.

THEORY OF RECIPROCITY REGARDING BASS RESPONSE: Since standing waves
are not easily amenable to correction by equalizing the speaker passively, it is necessary
to place both the speakers and listener/s in neutral zones. According to the mathematics
of the pressure zones, the flattest response occurs when both the speakers and listener
are at opposing ends of the room, directly against the wall surfaces. Since against-the­wall placement is not a prime location for soundstage ‘openness’ and imaging focus,
we recommend placing the speakers out into the room, at least 12" from the back wall to
start. Then, playing a repeating bass line, walk around the room in the general vicinity of
the intended listening position. If you find that the smoothest bass response does not
occur where you would like to place the listening seat, you can use the Law of
Reciprocity to find the optimum spot.

The physics of bass response are the same for the listener or the speaker when
interchanged. That means that you can place one speaker where you wish to sit, play the
repeating bass line, and then walk around on the other side of the room where you want
to place the speakers. When you find a neutral zone, where the bass is not too loud or
too soft, that’s where you place that particular speaker. Next, do the other side in the
same manner. Make sure you use a variety of recordings, since it is possible to optimize
the placement accidentally for only one frequency range!

TOO MUCH BASS OVERALL: If you have optimized the placement, yet find that the
bass is too powerful due to a very small room and/or mandatory corner placement due to
the nature of the furniture arrangement, you can “tune” the bass balance. If the entire
bass range is too loud, purchase Dacron Polyfill from the local five and dime store or
sewing shop. It is synthetic cotton in appearance and is used for pillow stuffing. Simply
place a handful of the Dacron in each vent tube; this will lower the efficiency of the vent
tuning. If the bass is still too loud overall, place another handful in each vent. If the low
frequency range has come into proper balance, stop there.

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BASS RESPONSE TUNING FOR TUBE AMPLIFIERS: Since tube amplifiers have “air
and liquidity” in the mid and treble ranges, many audiophiles use them. However, the
saturation, back EMF, and transient response delays of all output transformers will cause
sluggish bass response which can be heard when using any speaker that has response
below 50Hz. The deep bass can be tightened considerably by the addition of several
handfuls of Dacron in each vent, which is then pushed into the enclosure with a
broomstick. The stuffing can be done gradually, but if the bass become ‘too’ tight, it is a
simple matter to remove the excess Dacron by reaching in and pulling some of the
Dacron back out. (It takes a small hand to fit into the vent tube).

It is entirely possible to tighten the VR-7s bass response to a degree not heard with other
speaker systems, comparing directly with very small sealed woofers.

Try using solid core wire on the woofer modules when using tube amplifiers if

you are trying to tighten up the bass, since stranded wire will emphasize the

bass fullness you are trying to equalize. However, using silver cables will also

tighten the bass.

The best possible bass response is obtained from high current solid-state amplifiers,
making bi-amping the ideal choice for the critical audiophile who wishes to have the
best sound in every part of the frequency range. See the section above regarding bi­amping.

LACK OF APPARENT BASS: In some rooms, especially those with ‘soft’ walls such as
wallboard over studs, and open floor plans, it is possible to ‘lose’ bass response. Also,
when sitting in a ‘null’, it is possible to perceive, incorrectly, that there is a loss of bass
power. In these cases, it will be necessary to move either the speaker position or the
listening position in order to optimize the response. By playing a recording with a
repeating bass line, try walking around the room until you find the places where there is
apparent bass. It will be necessary, in some cases, to reposition the speakers in order to
allow the room to boost the bass by using the natural ‘gain’ of the boundary reflections.
Simply move the speakers closer to the rear wall or side-wall in small increments until
the bass sounds right.

ANCILLARY EQUIPMENT

The VR Series is far more transparent than any other competing design, including
electrostatics. (If you don’t believe this, put any electrostatic next to a VR and use a
transparent switching device such as a copper knife switch to directly compare the sound
of the VR to the electrostatic. Make sure that you use the same channel, since the
electronics may have a large difference in sound between the channels, and the same
brand of cable. It may be necessary to use a metal film resistor to equalize the sensitivity
of the louder speaker in order to make a fair test.)

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Since the VR design is quite transparent, lacking audible coloration and distortion, it is
necessary to use only the finest sounding equipment available to drive the VR-7's. This
does not mean you must purchase the most expensive gear, just good sounding
electronics, especially in the front end. Many digital products have limited depth and
excess treble brightness caused by overemphasis of harmonic structure. The VRs will
enable you to easily hear the differences even between digital cables, which
theoretically, should have no sound at all. Any sonic qualities you attribute to the VRs
are actually coming from the chain preceding the speakers.

When using neutral driving equipment, the VRs will be found to have virtually no sound
of their own! Since there are thousands of different combinations of components, we
cannot give any specific recommendations. Your VR dealer, however, is experienced
with many types of components and should be consulted for best results. We have made
an effort to seek out dealers who are experienced in the art of component matching and
have full trust in their abilities, so please use their expertise when building a system
around the VR series of loudspeakers.

TROUBLE SHOOTING

investigate any problems you may experience when setting up a world-class reference
system. However, if you find that you need specialized help, either in acoustical or
electronic interactions, please don’t hesitate to contact the factory. Call [phone]
and ask for Customer Service. A qualified engineer will be there to assist you with any
problems you are experiencing.

Bright Sound:

A very common problem is brightness, and is wrongly attributed to the speakers since
they are the apparent source of all sound. Some of the causes of brightness are:

1. Power line Noise. Can be ameliorated with a proper line conditioner.

2. Cable Resonance. Too many brands of different cables, which interact improperly.
Switch interconnects, including the digital cable, to a different brand.

3. Digital Noise. Use a power line filter on DAC
created by digital noise bleeding into the preamp, so don’t put the preamp on the same
filter as the DAC.

4. Lack of Proper Break-in. Please break speakers in 100-300 hours with

5. Source Material. Unfortunately, most commercial CDs are bright! Try using the
Green Felt Pen and the Bedini Clarifier. Make sure you clean the CDs and do not allow
them to get scratched.

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: Your VR dealer should have the necessary resources to

only. Many times the harshness is

loud music.

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Von Schweikert Audio

World Class Reference Speaker Systems for Music and Film

6. Transistor Sound. Older transistor gear is bright and lacks depth. Invest in newer gear.

7. Dirty Connections. Proper maintenance of a system requires cleaning of all RCA
connectors once a month; do not forget to clean the AC plug prongs. Tube sockets and
pins need to be cleaned as well, and is a source of ‘tube glare’, along with tube
deterioration itself. See your dealer for cleaners.

8. Cold Equipment. The entire system must be left on (excluding tube amplifiers)
continuously for best sound quality. Cold equipment, especially transistor preamps and
DACs, sound thin, sterile, and lack depth or dimension. Cold transistor amplifiers sound
harsh, lacking depth. Most experts recommend leaving the equipment on to avoid the
damage associated with cold turn-on, since the most wear to the electronic components
in an amplifier results from the inrush of current from the wall into a cold part. Once the
unit is left on, the voltages and temperatures stabilize, resulting in better sound and
component life. If in doubt, check with the electronics manufacturer or dealer.

9. Bloated Image or Poor Focus. Slap echo from hard walls, or too much rear
Ambience.

10. Room Effects: Boomy Bass, Harsh Highs. Not many audiophiles realize how
important their room acoustics are to the overall sound field. No matter how good the
speaker system and driving electronics, the room will have great influence over the final
sound, whether for better or worse! Harsh highs can be created by echoes reflected from
large wall surfaces with unbroken surfaces. If you can hear any echo when clapping
your hands, you will need to use some room treatment products.

11. Lack of Bass. Check the wiring to the woofer modules and make sure they are in
phase. Rooms can add or subtract bass response, but correct tuning and placement can
ameliorate these problems. If your electronics or cables are really bright, you may feel
that there is more treble than bass. Try substituting different electronics or cables and
recheck your room placement.

ROOM ACOUSTICS

Many books have been written about room acoustics, and there is not enough space in
this manual to give detailed information on how to do it right. However, the general rule
is to use 50% absorptive/50% reflective ratios when covering the room’s surfaces, such
as carpeting, drapes, stuffed furniture, bookshelves filled with books, records, etc. It is
helpful to damp the first reflection points, which are the boundary surfaces halfway
between the listener and the speaker cabinets. This includes the ceiling, walls, and floor.
Hard plaster ceilings will reflect treble energy back down towards the listener, and
should be treated with acoustic tiles (the soft and porous type) or damping pads made
from foam or fiberglass.

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The walls can have a decorator rug, drapes, or diffusers at the first reflection point and
the floor can use carpeting. We have used plants and trees to diffuse the echo in our very
large sound room, and found that this works better than simply absorbing the high
frequency reverberation. Some of these diffusion devices are made by Acoustic Sciences
Corporation, Echo Busters and RPG, along with others.

Tube Traps by ASC are placed in room corners and will absorb bass boom and flutter
echo in the mid/treble region. Michael Green offers Corner Tunes, which are placed in
the upper corner joints of the wall/ceiling junction. Call your dealer for more info.

One last thing: if your VR speaker system does not elicit goose bumps, your set-up
is not optimized!

CARE FOR THE FINISH: Only Windex and a soft cloth should be used to remove
fingerprints from the wood finish. A deeper shine can be obtained through the use of
wax-based cleaners such as Pledge.

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SPECIFICATIONS

Woofer System: Twin 10.5" Extreme-duty drivers with Magnesium cones and long-throw

copper-clad Low Distortion Motors.

Midrange: Single 7" midrange with Aerogel composite cone and Low Distortion Motor.
Tweeter: Single 1.5" Scan Speak dual concentric ring radiator diaphragm, silk laminated with

two polymer resin coats: long-throw design using Low Distortion Motor, Ferro fluid liquid
cooled.

Super Tweeter: Single 3” aluminum pure ribbon.
Cabinet Design: Isolated, dual stacking cabinetry, utilizing triple-chambered transmission line

loading with twin rear vents on bass module and sealed for the midrange/tweeter module.
Crossover Type: Global Axis Integration Network for accurate off-axis frequency response and

consistent phase.

Ambience Retrieval System: 1" soft dome mid/tweeter with rear-firing wave-guide, Dimension
Control for setting effects level.

Input Terminals: Two sets of WBT rhodium-plated five-way binding posts.
Crossover Points: 190 Hz, 1.9 kHz, 19kHz..
Frequency Response: 15 Hz to 40 kHz (-2dB).
Impedance: 8 ohms nominal (Midrange/Tweeter), 4 ohms nominal (Woofers), 6 ohms average.
Sensitivity: 94 dB @ 1w/1m using 2.83V.
Power Rating: 20 watts up to 500 watts music power.
Dimensions: 56”H x 18”W x 30”D.
Weight: Midrange/Tweeter 105 lbs each. Woofer 275 lbs each. System 380 lbs each.
Warranty: Ten Years excluding abuse or burnt voice coils due to amplifier clipping.

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