Wisdom Audio SAS User Manual

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Owner’s Manual
Wisdom Audio SAS
Subwoofer
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Important Safety Instructions
Please read all instructions and precautions carefully and completely before op­erating your Wisdom Audio equipment.
1. Read these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this equipment near water.
6. Clean only with a dry cloth.
7. Do not block any ventilation openings. Install in accordance with the manu­facturer’s instructions.
8. Do not install near any heat sources such as radiators, heat registers, stoves,
or other apparatus (including ampliers) that produce heat.
9. Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades with one wider than the other. A grounding type plug has two blades and a third grounding prong. The wide blade of the third prong are provided for your safety. If the provided plug does not
t into your socket, consult an electrician for replacement of the obsolete
outlet.
10. Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the point where they exit from the ap­paratus.
11. Only use attachments/accessories specied by the manufacturer.
12. Unplug this apparatus during lightning storms or when unused for long peri­ods of time.
13. Refer all servicing to qualied personnel. Servicing is required when the ap- paratus has been damaged in any way, such as a power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the appara­tus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.
14. ALWAYS disconnect your entire system from the AC mains before connect- ing or disconnecting any cables, or when cleaning any component.
15. NEVER operate this product with any covers removed.
16. NEVER wet the inside of this product with any liquid.
17. NEVER pour or spill liquids directly onto this unit.
18. NEVER bypass any fuse.
19. NEVER replace any fuse with a value or type other than those specied.
20. NEVER operate this product in an explosive atmosphere.
21. ALWAYS keep electrical equipment out of the reach of children.
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Table of Contents
Important Safety Instructions .........................................................................3
Introduction .................................................................................................... 6
About this manual ..................................................................................................6
Description .....................................................................................................7
Regenerative
Transmission Line™ ...............................................................................................7
Unpacking the SAS ..........................................................................................8
Room Acoustics & Placement ..........................................................................9
Start With the Room ..............................................................................................9
Rigid Walls ......................................................................................................9
Speaker Placement ...............................................................................................10
Left & Right Speakers ....................................................................................10
Center Channel .............................................................................................10
Remote Setup via Modem .................................................................................... 10
Surround Speakers ........................................................................................11
Subwoofer Placement ..........................................................................................11
Room Treatment ..................................................................................................12
Professional Acoustic Design ...............................................................................12
References ........................................................................................................... 13
Connections .................................................................................................. 14
Setting Up the SAS ........................................................................................ 15
North American Warranty ............................................................................16
Five Year Warranty............................................................................................... 16
Obtaining Service ......................................................................................... 17
Specications ................................................................................................18
SAS Dimensions ............................................................................................19
Notes ............................................................................................................. 20
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Introduction
Congratulations on purchasing your Wisdom Audio SAS subwoofer. The Regen­erative Transmission Line™ technology used in the SAS delivers tremendous bass performance in terms of depth, dynamics, and low distortion resulting in articu­late bass that integrates seamlessly with high-resolution main speakers.
About this manual This manual focuses on the SAS subwoofer itself. While we expect your local
Wisdom Audio dealer to take care of the setup and calibration of the system,
we still recommend that you at least briey review this and the other Wisdom
Audio manuals relevant to your system to understand the system’s full capabili­ties.
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Description
Your Wisdom Audio SAS subwoofer uses a modern implementation of an old
idea for high quality, low distortion bass reproduction. While the roots of the Regenerative Transmission Line™ go back to the 1950’s, it is the combination of modern computer modeling and the vastly more powerful motors of contempo­rary driver design that make the RTL™ so special.
Regenerative
Transmission Line™
There is a class of bass enclosures that has been around since the 1950’s, which can be described generically as “low frequency tapped waveguides” or “tapped pipes.” It was an idea that was a bit ahead of its time then, since fully optimiz­ing its use required both powerful drivers and computer modeling. But if you
are into such things, check out US Patent 2,765,864 (led in 1955), and an AES
paper published in 1959, “Analysis of a Low Frequency Loudspeaker System.” We have published both on our website for your convenience, at
http://www.wisdomaudio.com/support_documents.php
We have utilized sophisticated modeling software in order to fully optimize our
enclosures, and have developed drivers that are specically optimized for this
application. We call our unique implementation of this relatively old idea a “Re­generative Transmission Line™” subwoofer, or “RTL™” sub for short.
All dynamic drivers develop energy on both sides of the diaphragm, with the rear energy being 180° out of phase with the front energy. If you allow the
driver to operate in free space (no enclosure), the front and rear energies largely
cancel each other out — especially at low frequencies.
In our Regenerative Transmission Line™ subwoofer, the energy from the back side of the driver is sent along a long, folded path in such a way that its lowest frequencies arrive back at the front side of the driver in phase, effectively sum­ming to an increase of 6 dB in output. Thus, the energy from both sides of the woofer cone is used in a productive way, resulting in a substantial reduction in distortion and an effective surface area that is twice what you would otherwise expect.
The results are quite stunning. Low frequencies are strikingly dynamic and responsive, and integrate quite seamlessly with the fast and detailed Wisdom Audio planar magnetic hybrids.
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Unpacking the SAS
The Wisdom Audio SAS subwoofer is a substantial piece of equipment. Please exercise caution when unpacking your SAS to ensure that you do not strain yourself from its (perhaps unexpected) weight.
Caution! Do not attempt to lift your SAS while bending or twisting from the
waist. Use your legs for lifting, not your back. Always stand as straight as possible and keep the SAS close to your body to reduce strain on your back.
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Room Acoustics & Placement
Wisdom Audio believes in equalization. Assume for a moment that you had a “perfect” loudspeaker: as soon as you place it in your room, its perfection is gone. In fact, even good rooms can introduce deviations of 20 dB to the re­sponse of the system. This is particularly true in the bottom two octaves, where a subwoofer operates.
It seems strange to us to worry about tenths-of-a-decibel differences between one component and another when there are 10-20 dB problems right there in the room with you.
At the same time, room equalization is not a panacea. It does not solve all prob­lems. In fact, and somewhat paradoxically, EQ works best when it has the least to do. It is best used as the “nishing touch” on an otherwise good system. Un­fortunately, most people do not understand that the most important component in their system is their listening room.
This manual does not have the space for a full description of everything that goes into creating excellent room acoustics; doing so would require a textbook of several hundred pages. Instead, we will give you some ideas, and some refer­ences to pursue should you want to learn more.
Start With the Room There are many myths oating around pertaining to what a “good room” should
be like. One of the most common is that it should have non-parallel walls. With­out going into the details, we recommend staying with rectangular rooms whose dimensions do not share common divisors.
Thus a room with dimensions of 8’ by 16’ by 20’ would be quite poor (since the
dimensions are all divisible by a length of 4’, and 16 is also a multiple of 8). By
contrast, a room whose dimensions are 9’ by 16’ by 29’ would be much better, since none of the dimensions are mathematically related to one another.
There are innite variations on this idea. If you have the exibility to choose (or modify) your room dimensions to avoid such problems, do so. Either way, ca-
pable room optimization will be a big help making the most of what you have.
Rigid Walls Another myth that should be dispelled is the notion that the walls (and ceiling
and oor) of the room should be extremely rigid in order to reproduce good bass. Rigid, inexible walls reect energy extremely well; thus you will keep
more of the bass energy in the room. This much is true. However, those rigid walls will only increase the amplitude of the standing waves that your room naturally supports. In simple terms, you will have more bass, but it will also be more irregular, with larger peaks and valleys in the response.
Walls that ex a bit (but do not rattle) are much better. Coincidentally, tradition­al American residential construction standards (sheet rock on wooden studs) are
not a bad place to start. You can do better still with professional help, but studs and sheet rock are better than poured concrete. (If your listening room is in the basement, a false wall can easily be built in front of the concrete. You probably
need something like this for insulation and aesthetics anyway.)
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The ultimate in dedicated listening room construction involves the design and
construction of oating walls, ceiling and oor. This approach yields the added benet (when done properly) of providing outstanding acoustic isolation from
adjacent spaces as well as superb bass reproduction. This approach goes well beyond the scope of an owner’s manual; if you are interested, you should con­tact a professional acoustician who has specialized in this sort of domestic room design.
Speaker Placement Within the room itself, placement of the speakers and the listener will have a
profound effect on the performance of the system, particularly below 300 Hz
or so. There is no “perfect” position that will solve all problems, but nding the
best compromise will make it easier to solve the remaining problems with good
room optimization such as in the Wisdom Audio SC-1.
Your Wisdom Audio dealer can help you with optimizing your speaker place­ment, which is never quite as simple as it seems it should be. The characteristics you should listen for are several:
Left & Right Speakers Goal #1: Stable, 3-dimensional stereo imaging
This usually requires reasonable symmetry within the room. Mono (correlated)
pink noise can help here, though it does not replace listening to music. With
pink noise playing in both speakers, you should hear a tightly-dened little “ball” of pink noise oating in space exactly halfway between the speakers.
Goal #2: Smooth, consistent bass
Oft-cited rules of thumb for smoother bass reproduction include both “placing the speakers at different distances from the side walls vs. the wall behind them,” and “placing them at ‘odd fractions’ of the room’s dimensions” (e.g., fractions in which the denominator is an odd number, like 1⁄3, 2⁄5, 2⁄7, etc.). But nothing replaces your experience in your room, combined with your dealer’s experi­ence in a variety of rooms. Playing pink noise through the woofer sections of your Wisdom Audio speakers (with the microphone at the listening position, and
prior to doing any equalization) and watching the results on a Real Time Ana­lyzer (RTA) will let you see the results of your labors.
Center Channel Center channel height
Once you have a solid stereo image up front (when listening only to the Left and the Right speakers), you need a center channel speaker for multichannel repro­duction. It should be centered between the Left and Right, and centered on the screen’s location, preferably at the same height as the Left and Right speakers. This presents an obvious problem: you cannot place a speaker in front of your television screen.
Ideally, a center channel speaker would be behind an acoustically transparent front projection screen and would match the Left and Right speakers. Doing so would ensure the best possible consistency of tonal balance, image height, and dynamic capabilities for the critical center channel. This is how it is done in all good commercial theaters.
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Another possibility that works well in certain instances is to use the “phantom center channel” feature of your surround processor. This works best when the room is reasonably symmetrical and the listeners are more-or-less directly in front of the TV. It uses the natural stereo imaging ability of the speakers to create
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a center image where it belongs. f course, if people are sitting well off to one
LR
side in the room, the image tends to fall into the nearest speaker.
Failing an acoustically transparent screen or a phantom center channel ap­proach, the important thing is to match the tonal and dynamic capabilities of the Left and Right speakers while minimizing the change in image height as a sound is panned across the front stage. Wisdom Audio has designed horizontally-ori-
ented planar magnetic hybrid speakers that will match your Sage loudspeakers
superbly; place them as close to the edge of the screen as is practical.
Surround Speakers Surround channel geometry
In a 5.x channel system, the surround should be placed either directly to the sides of or slightly behind the listening area (90°–110° from the center channel,
as seen from above). In a 7.x system, the surround speakers should be closer to
90° from the center speaker, and the surround back speakers should be at ap­proximately 135°–150° from the center speaker. This conforms to industry stan­dards, and ensures that you hear what was intended from a spatial placement point of view. (Too often, the surround speakers are all behind the listeners, cre-
ating a big “hole” in the soundeld between the front and the back.)
Sub 1
C
22°
30°
One possible exception to these guidelines: if you have a THX®-certied pro-
cessor and are using the THX Advanced Speaker Array™ circuitry, you should
follow the guidelines in your owner’s manual for the processor. Using this technology, it can actually be more effective to have the rear speakers in a 7.x system directly behind you and immediately adjacent to each other.
Subwoofer Placement Subwoofers offer somewhat greater exibility in placement, since the frequen-
cies they reproduce are not readily localizable by the human ear. This is due to
the fact that the wavelengths they reproduce are more than ten feet (3 meters) long, but our ears are located only about 6-7 inches (17 cm) apart. Thus these
extremely long waves do not contribute meaningfully to the imaging that the main speakers create.
Sub 2
90°
110°
R
R
s
b
L
s
135°
L
b
a 7.2 channel system layout
150°
However, this fact does not mean that the placement of the subwoofers has no effect on the sound quality in the room. Far from it. The subwoofers are the
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most likely to suffer from the response irregularities introduced by the room itself, operating as they do below approximately 80 Hz in most systems.
Recent research into the behavior of rooms as a function of speaker placement
has concluded that — if you have the freedom to do so — there are signicant
advantages to placing several smaller subwoofers around the room, rather than
relying on a single large woofer. Moreover, the optimum placement is usually
at 25% and 75% of the room width, or deep in the corners of the room. If you have the luxury of doing so, this simple placement strategy can reduce the size of the room’s response irregularities from 20 decibels down to perhaps as little as 6-8 decibels—a tremendous improvement.
Reducing the room’s inherent problems to this degree provides a huge advan­tage. It allows products like our own SC-1 System Controller to put their con­siderable abilities to work on perfecting your system’s response, rather than on trying to perform major corrective surgery.
Room Treatment Rectangular rooms have six reecting surfaces (four walls, ceiling and oor)
that reect sound to the listener, after various delays introduced by the indirect routes the sound take on their way. These rst reections are particularly dam-
aging to sound quality. Looking at the simplest case of stereo reproduction, you have a minimum of twelve rst reection points in your room that deserve some attention.
Unfortunately, it is often difcult to do much about the ceiling and oor reec­tions, even though they are arguably the most destructive. (The minimization of
these reections is one of the strongest arguments for the tall, line source loud­speakers that Wisdom Audio builds.) This leaves you with eight “rst reections”
that you should consider minimizing somehow. These points are easily found by having an assistant slide a small mirror along the four walls of the room, while you sit at the listening position. Any place on the wall where you can see a re-
ection of any speaker is a rst reection point. Concentrate on the rst reec­tions for the Left and Right speakers rst.
If you can, arrange to apply either absorption or diffusion at these eight points (don’t forget the wall behind you). Absorption can be as simple as heavy, insu­lated drapes; diffusion can be provided by a well-stocked bookcase with books of varied sizes. Alternatively, you can buy purpose-designed room treatments
(some sources listed under References, below).
The important things to remember are these: a good room should have a bal­ance of absorption and diffusion; and if you are going to treat only a few areas
of the room, the rst reection points are the most important ones to treat.
Professional Acoustic Design Does this all sound too complicated? For good reason: it is complicated.
The difference between the average listening room and one that is professionally designed and implemented is huge. A great listening room will disappear to an astonishing degree, letting the experiences captured in your recordings speak to you directly. A well-designed room is also quieter and more comfortable. It can easily become a favorite retreat for peace and rejuvenation.
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If you decide to investigate the possibility of improving your room with the help
of a professional, it is important to nd someone who focuses on residential spaces. Most acousticians are trained to deal with large spaces — airports, au-
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ditoriums, lobbies in commercial buildings, etc. The problems seen in “small”
rooms (residential spaces) are quite different, and outside the experience of most
acousticians. Find someone who specializes in and has a great deal of experi­ence designing home studios, home theaters, and the like. Your Wisdom Audio dealer may be such a person; failing that, he/she can help you nd such a pro­fessional.
References Books on Acoustics:
The Master Handbook of Acoustics, F. Alton Everest, TAB Books Sound Reproduction: The Acoustics and Psychoacoustics of Loudspeakers and Rooms by Dr. Floyd Toole, Focal Press
Suppliers of Acoustic Treatments:
Acoustic Innovations, http://www.acousticinnovations.com/ Acoustic Sciences Corporation, http://www.acousticsciences.com/ Echo Busters, http://www.echobusters.com
MSR Acoustics, http://www.msr-inc.com/home_theater/hometheater.html RPG Diffusor Systems, http://www.rpginc.com/
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Connections
1. Speaker Terminals
Connect the + and – terminals of the power amplier that is driving the SAS to the corresponding + and – terminals of the SAS, located in the re-
cessed input cup.
Note that while Wisdom Audio ampliers are all non-inverting, some other brands of power ampliers do invert polarity. It is always best to
check the polarity of all your speakers with a polarity checker such as can be found in the AudioTools suite from Studio Six Digital, or with dedicated hardware such as the Galaxy Cricket Test Set.
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Setting Up the SAS
The unusual form factor of the SAS allows it to be used effectively in many situ­ations where a more conventional “bass cube” would be either cumbersome or impossible. Examples include locating it behind a couch, in the small space
between the couch and the wall, or laying at under a set of risers in a home
theater with multiple rows of seating.
The SAS also includes two locations for the exit of the Regenerative Transmis­sion Line™. As shipped from the factory, the vent is located on the end of the
SAS enclosure. However, if your location would be better served by the vent
being on the side, your dealer can easily swap the grille for the solid aluminum plate that covers that location. There is no difference in performance, but often
a great difference in application exibility.
As with most subwoofers, the SAS requires equalization for fully optimizing its
performance. This EQ may be provided by any of the following the Wisdom Audio products:
• SC-1 System Controller (if one exists in the system)
• SW-1 Subwoofer Ampler (which includes on-board DSP-based EQ)
• MiniDSP-1 Signal Processor
When properly adjusted and listening to music, you should not be aware that
the SAS is active in the system (until you turn it off and realize how much it has been contributing). The proper level setting will allow the SAS to integrate quite
seamlessly into a high quality system.
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North American Warranty
Five Year Warranty When purchased from and installed by an authorized Wisdom Audio dealer,
Wisdom Audio® loudspeakers are warranted to be free from defects in material
and workmanship under normal use for a period of ve years from the original
date of purchase.
During the warranty period, any Wisdom Audio loudspeaker exhibiting defects in materials and/or workmanship will be repaired or replaced, at our option, without charge for either parts or labor, at our factory. The warranty will not apply to any Wisdom Audio loudspeaker that has been misused, abused, al­tered, or installed and calibrated by anyone other than an authorized Wisdom Audio dealer.
Any Wisdom Audio loudspeaker not performing satisfactorily may be returned
to the factory for evaluation. Return authorization must rst be obtained by
either calling or writing the factory prior to shipping the component. The fac­tory will pay for return shipping charges only in the event that the loudspeaker is found to be defective as mentioned above. There are other stipulations that may apply to shipping charges.
There is no other express warranty on this loudspeaker. Neither this warranty nor any other warranty, express or implied, including any implied warranties of
merchantability or tness, shall extend beyond the warranty period. No respon­sibility is assumed for any incidental or consequential damages. Some states do
not allow limitations on how long an implied warranty lasts and other states do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you.
This warranty gives you specic legal rights, and you may also have other rights
which vary from state to state. This warranty is applicable in North America only. Outside of North America, please contact your local, authorized Wisdom Audio distributor for warranty and service information.
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Obtaining Service
We take great pride in our dealers. Experience, dedication, and integrity make these professionals ideally suited to assist with our customers’ service needs.
If you develop a problem with your Wisdom Audio subwoofer, please contact your dealer. Your dealer will then decide whether the problem can be remedied locally, or whether to contact Wisdom Audio for further service information or
parts. The Wisdom Audio Service Department works closely with your dealer to
solve your service needs expediently.
Important! Return authorization must be obtained from Wisdom Audio’s Service
Department BEFORE a unit is shipped for service.
It is extremely important that information about a problem be explicit and com-
plete. A specic, comprehensive description of the problem helps your dealer and the Wisdom Audio Service Department locate and repair the difculty as
quickly as possible.
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Specications
All specications are subject to change at any time, in order to improve the
product.
Frequency Response 30 – 80 Hz ± 3dB relative to the target curve
Impedance
Sensitivity 90 dB SPL/2.83V/1m
Maximum Output (at one meter in
Power Handling, Peak 450W
Dimensions see dimensional drawing on next page
Shipping weight 45 lbs. (20.5 kg)
For more information, see your Wisdom Audio dealer, or contact:
Wisdom Audio 1572 College Parkway, Suite 164 Carson City, NV 89706 www.wisdomaudio.com information@wisdomaudio.com Ph: 775.887.8850 Fax: 775.887.8820
1
4 space) 115 dB @ 30 Hz
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SAS Dimensions
7.000
[177.8 mm]
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Notes
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WISDOM and the stylized W are registered trademarks of Wisdom Audio.
1572 College Parkway, Suite 164
Carson City, Nevada 89706 USA
Wisdom Audio
Telephone: 775.887.8850
Fax: 775.887.8820
www.wisdomaudio.com
SASOM-1.0 © 3/2014 Wisdom Audio, Inc. All rights reserved. Printed in U.S.A.
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