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.
2. Keep 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 ampliers) 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 specied by the manufacturer.
12. Unplug this apparatus during lightning storms or when unused for long periods of time.
13. Refer all servicing to qualied 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 specied.
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
Specications ................................................................................................18
SAS Dimensions ............................................................................................19
Notes ............................................................................................................. 20
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 briey 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 specically 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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