Emotiva Airmotiv S8 User manual

Important Safety Precautions and Explanation of Symbols
The exclamation point within an equilateral triangle is intended to alert the user to the presence of
important installation, operation, and service instructions in this manual.
The lightning ash with arrowhead symbol within an equilateral triangle is intended to alert the user to the
presence of uninsulated dangerous voltages within the enclosure that may be of sucient magnitude to
constitute a risk of electrical shock to the user.
Please read this manual thoroughly before attempting to install, congure, or operate the Emotiva Airmotiv
S8 Flex Subwoofer. After successful installation and conguration of the Flex Sub, be sure to retain this
manual in a safe place for future reference.
Safety is a key component to a long lasting and trouble free installation. Please read and follow all
instructions and heed all warnings on the Flex Sub and in this manual. The vast majority of the subsequent
safety precautions are common sense. If you are not comfortable with the installation of audio/video
entertainment equipment, you should seek the services of a qualied installation professional or call us for
help.
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT USE THE FLEX SUB NEAR
WATER OR IN WET LOCATIONS, DO NOT EXPOSE IT TO RAIN OR MOISTURE, DO NOT EXPOSE IT TO
DRIPPING OR SPLASHING FROM OTHER SOURCES, AND ENSURE THAT NO OBJECTS FILLED WITH
LIQUIDS SUCH AS VASES ARE PLACED ON IT. DOING SO MAY RESULT IN DAMAGE TO THE UNIT AND
THE RISK OF ELECTRIC SHOCK, WHICH MAY RESULT IN BODILY INJURY OR DEATH.
WARNING: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE THE AMPLIFIER PLATE OR
DRIVERS FROM THE FLEX SUB. THERE ARE NO USERSERVICEABLE PARTS INSIDE THE UNIT. REFER ALL
SERVICE TO QUALIFIED SERVICE PERSONNEL.
Do not install the Flex Sub near or above any heat sources such as radiators, heating vents, or other
apparatus’ that produce heat. Do not block any ventilation openings or heat sinks. Avoid installing the
unit directly above other heat-producing equipment unless sucient ventilation or forced-air cooling is
provided.
Do not install the Flex Sub in locations without proper ventilation. The Flex Sub should not be operated
on a bed, sofa, rug, or similar surface that may block vents. The unit should not be installed in an enclosed
location such as a bookcase, cabinet, or closed equipment rack unless sucient forced-air ventilation is
provided, and clearance should be maintained between the rear-mounted heat sinks and objects like
drapes that may reduce ventilation.
Always install your Flex Sub according to the manufacturer’s instructions and only use attachments or
accessories specied by the manufacturer.
Do not install the Flex Sub on any stand, shelf, or other piece of furniture that is unable to support its
weight. If a cart is used to move the unit, use caution to avoid injury from tip-over.
Connect the Flex Sub only to power sources of the correct voltage (as shown in this manual and on the Flex
Sub unit).
Protect power supply cables from being pinched, walked on, or otherwise damaged. Be especially careful
where the power cable enters the power outlet and the unit.
Only connect the Flex Sub to an electrical outlet or extension cord of appropriate type and rating.
!
!

DO NOT defeat the safety purpose of a grounding or polarized plug by removing ground pins or using
unsafe adapters. A polarized plug has two blades - one wider than the other. A grounding plug has a
third ground prong in addition to the two main conductors. The wide blade or third groundling prong is
provided for your safety. If the provided plug does not t your outlet, consult an electrician to replace your
obsolete outlet. If you replace the power cord, only use one of similar type and equal or greater current
rating.
The power cable for the Flex Sub should be unplugged from the outlet during severe electrical storms, or
when unused for a long period of time.
Only replace the fuse(s) in the Flex Sub with fuse(s) of proper value and voltage rating.
The Flex Sub should only be cleaned as directed in the manual. Avoid spraying liquids directly onto the unit
or drivers.
You should seek service for your Flex Sub by qualied service personnel if any of the following occur:
1. The power-supply cord or the plug has been damaged.
2. Objects or liquid have fallen or spilled into the unit.
3. The unit has been exposed to rain.
4. The unit exhibits a marked change in performance.
5. The unit has been dropped, or its enclosure or drivers are damaged.
NOTE: TO COMPLETELY DISCONNECT THE FLEX SUB FROM THE AC POWER MAINS, DISCONNECT THE AC
POWER CORD FROM THE AC RECEPTACLE.
NOTE: THE POWER CORD ON THE FLEX SUB MUST REMAIN READILY ACCESSIBLE AT ALL TIMES.
!
CAUTION
CAUTION: TO REDUCE THE RISK
OF ELECTRICAL SHOCK, DO
NOT REMOVE COVER. NO USER
SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED
SERVICE PERSONNEL.

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AIRMOTIV S8 Flex SubwOOFeR
Contents
Important Safety Precautions and Explanation of Symbols
Introduction ......................................................................................................................3
About This Manual..........................................................................................................4
Features ..............................................................................................................................5
Unpacking..........................................................................................................................6
Quick Start .........................................................................................................................7
Setting The AC Line Voltage ........................................................................................7
Airmotiv S8 Flex Subwoofer ........................................................................................8
Airmotiv S8 Flex Subwoofer Controls ......................................................................9
Subwoofer Placement and Conguration........................................................... 12
System Congurations ............................................................................................... 13
Care and Maintenance ............................................................................................... 19
Emotiva Audio Corporation Five-Year Limited Warranty ............................... 20
Notes................................................................................................................................. 23
Airmotiv™ S8
Flex SubwooFer
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AIRMOTIV S8 Flex SubwOOFeR

Page 3
AIRMOTIV S8 Flex SubwOOFeR
Introduction
Thank you for purchasing the new Emotiva Airmotiv™ S8 Flex Subwoofer.
Emotiva Airmotiv™ Subwoofers are designed to reproduce the lowest frequencies in the audio
spectrum accurately and with exceptionally low distortion - even at the high listening levels found in
modern movies. All of our Airmotiv Subwoofers deliver the dynamics and raw power you need to make
a modern movie sound track rattle the walls... with the precision and superb musicality you need to
get the most from well recorded music. With our Airmotiv Subwoofers, you don’t have to compromise;
you really can have it all.
The Airmotiv S8 Flex Subwoofer was specically designed from the ground up to fulll a wide variety
of needs. The heavy duty long throw downward ring 8 inch powered driver, 8 inch passive radiator,
and ecient 200 watt Class-D amplier, deliver more than enough low bass to ll a room, and its small
footprint enables the Flex Sub to easily t in a wide variety of locations. If you have a large room, or
like your bass a little more extreme, the Flex Sub’s small size and aordable price tag will simplify your
decision to use two or three Flex Subs, positioned at strategic locations in your room.
As you might expect, the Airmotiv S8 Flex Sub has the standard complement of Level, Crossover
Frequency, and Phase adjustments, and includes both manual and automatic turn-on options.
However, where the Airmotiv S8 really earns the title of Flex Subwoofer is with its exible connection
options, which enable you to integrate the Flex Sub into virtually any home theater or stereo music
system. Use the LFE input to connect the Flex Sub directly to the subwoofer output on any home
theater AVR or preamp/processor that has its own bass management. Or, if your source has a line level
subwoofer output, but doesn’t have internal bass management, simply use the controls on the Flex
Sub to adjust it to work perfectly with the rest of your system. If the only outputs you have on your
AVR or amp are speaker outputs, you can connect them to the High Level Inputs on the Flex Sub, and
use the controls on the Flex Sub to congure a perfect match to the rest of your system. And, if you’ve
got a preamp or DAC that has line level outputs, but no bass management, you can connect it to the
line level inputs on the Flex Sub, connect the line level outputs on the Flex Sub to your power amp,
then use the full 2.1 channel active bass management that’s built into the Flex Sub.
And, of course, we’ve made sure that the Airmotiv S8 Flex Sub looks good, with or without its
removable sculpted grill, and sounds great with both music and movies.
Happy listening!
The Emotiva Team

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AIRMOTIV S8 Flex SubwOOFeR
About This Manual
This manual will provide you with all the information you need to achieve great performance,
accurate sound, and many years of reliable service from your Airmotiv S8 Flex Subwoofer.
We suggest that you read through the entire manual; we kept things as short and direct as
possible. Even if you’re an expert user, you will probably nd some interesting information and
useful suggestions.
If you’re really in a hurry to get started, please read the Quick Start section (on page 7); you may
then read the remainder of the manual at your leisure.
You may wish to record serial numbers or other purchase information on the Notes page at the
back of this manual.

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AIRMOTIV S8 Flex SubwOOFeR
Features
The Emotiva Airmotiv™ S8 Flex Subwoofer was designed to combine good looks, great
performance and sound quality, in a small footprint that enables it to t easily into almost any
room. Flexible connection options integrate perfectly with almost any home theater or stereo
music systems.
The following are a few of the feature highlights of our Airmotiv S8 Flex Subwoofer:
• High performance, compact size, and great sound - The Airmotiv S8 Flex Subwoofer is
a exible, compact, high-performance 8”powered subwoofer that sounds great with both
music and home theater content.
• Downward ring driver and forward ring passive radiator - The 8” long excursion active
driver and 8” heavy duty passive radiator deliver clean, powerful, musical low bass, with no
distracting port noise.
• Powerful Class-D amplier - The ecient, audiophile quality, Class-D amplier provides 200
watts RMS of clean power to drive the Flex Sub to satisfying listening levels.
• Transparent limiter circuitry - ensures that the Flex Sub always sounds good, but is almost
impossible to overdrive.
• Flexible power options - The Flex Sub can be congured to automatically switch itself on
when it senses music at its inputs, to be turned on manually, or to remain on continually.
• Flexible input options - The Flex Sub includes both speaker level and line level inputs for
maximum exibility and compatibility with a wide variety of dierent systems.
• Flexible controls and adjustments - allow you to congure the Level, Crossover Frequency,
and Phase of the Flex Sub for a perfect match with the rest of your system.
• Internal 2.1 channel line level active crossover - for use with preamps, DACs, and other
audio sources that don’t otherwise support a subwoofer. This allows you to add fully active
bass management to systems that don’t already include it by simply connecting the output
of your preamp or DAC to the Flex Sub, and then connecting the line level outputs of the Flex
Sub to the inputs of your power amp. Low frequency content is routed directly to the internal
amp on the Flex Sub, while the remainder of the audio spectrum is routed to your main power
amp, and both are controlled by the fully active bass management in the Flex Sub.
• Heavy acoustically inert MDF cabinet - keeps distracting cabinet noises and vibration to an
absolute minimum. Integral feet, with non-slip decoupling pads, protect delicate oors and
ensure that your Flex Sub will stay exactly where you want it.
• Tough textured exterior and removable sculpted fabric grill - The cabinet on the Flex Sub
is covered in tough yet attractive textured black vinyl, and a removable sculpted black fabric
grille, supportd by a heavy, vibration resistant frame, is included.
• Full ve year warranty - ensures that you’ll enjoy your Flex Sub for years to come.
You can nd more information about the Airmotiv S8 Flex Subwoofer on our website at
www.emotiva.com.

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AIRMOTIV S8 Flex SubwOOFeR
Unpacking
Your Airmotiv S8 Flex Subwoofer was carefully packed and should reach you in perfect condition.
If you notice any shipping damage or other issues when you unpack it, please contact Emotiva
immediately.
Gently remove your Flex Sub from the packing carton and remove all wrappings and shipping
material.
It is important to save the box and all packing materials in case your Flex Sub subwoofer ever
needs to be moved or shipped back to the factory for service.
Please keep your sales receipt in a safe place. It is the easiest way to verify your purchase date for
warranty purposes, and may also be required if you ever have to le an insurance claim.
We truly value customer feedback and would like to hear from you.
WARNING: The Airmotiv S8 Flex Subwoofer has speaker drivers installed on both the front and
BOTTOM surfaces of its cabinet. USE CARE TO AVOID PRESSING ON THE CONE OF THE DRIVER
ON THE BOTTOM OF THE CABINET WHEN LIFTING OR HANDLING THE FLEX SUB. DO NOT set the
Flex Sub on soft surfaces that may touch or press against the driver on the bottom or impair its
motion.

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AIRMOTIV S8 Flex SubwOOFeR
Quick Start
To get the most from your Airmotiv S8 Flex Subwoofer, we urge you to read the entire manual. If
you just can’t wait to hear how great your Flex Sub sounds, this section will cover the basics you
need to get started.
• Find a secure location for your Flex Sub.
• Make sure your Flex Sub is set for the proper line voltage for your area.
• Connect your Flex Sub to the LFE or subwoofer output on your AVR or pre/pro.
• Congure your AVR or pre/pro to work with a subwoofer.
• Find some music you really like to listen to.
• Enjoy!
While you’re enjoying your Airmotiv S8 Flex Sub, it would be a great time to read the rest of the
manual to learn more about them.
Setting The AC Line Voltage
Before plugging in your Airmotiv S8 Flex Subwoofer for the rst time, conrm that it is congured
to operate at the correct line voltage for your area. If you move to a dierent country, or a dierent
region, with a dierent line voltage, you MUST change the Line Voltage setting on your Flex Sub
to the correct line voltage.
Note: Attempting to operate your Flex Subwoofer with the Line Voltage Selector Switch set to
the wrong voltage for your area may result in damage to your Flex Sub.
To congure the AC Line Voltage for your Flex Sub, use a small screwdriver to slide the Line
Voltage Selector Switch to the proper position.
Note:
See pages 9 through 11 for the location of the Line Voltage Selector Switch. The currently
congured line voltage is displayed through the window on the top of the switch protector
cover.

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AIRMOTIV S8 Flex SubwOOFeR
Airmotiv S8 Flex Subwoofer
The Airmotiv S8 Flex Subwoofer is the ideal way to extend the bass
response of your audio system to cover the last octave of bass with
authority and nesse. The Airmotiv S8 Flex Sub can deliver the solid
low bass response you need to add that nal touch of realism to
a movie, while still oering the low distortion and precise control
necessary for superb sounding music reproduction.
Driver Complement
Active driver: 8” downward ring heavy duty long throw subwoofer with
a vented steel frame, rubber surround, and treated paper cone.
Passive radiator: 8”front ring passive radiator with a steel frame, rubber
surround, and treated paper cone.
Cabinet
Heavy, acoustically inert MDF cabinet, covered on all sides with tough
attractive textured vinyl. Includes a removable sculpted fabric grill with
heavy vibration resistant MDF support frame.
Electronics
Amplier: 200 Watt RMS, cool running, audiophile quality, high eciency
Class D amplier.
Protection: Acoustically transparent limiter.
Frequency response: 33 Hz - 200 Hz (+/- 3 dB).
Inputs: Stereo left and right unbalanced RCA inputs; LFE unbalanced RCA
input; high level left and right inputs for connection to speaker outputs.
Outputs: Stereo left and right unbalanced RCA stereo inputs
(with user-congurable 60/80/100 Hz high-pass bass management
crossover).
Controls: Volume, X-Over Frequency, Phase, and Power mode; separate
switch to control high-pass crossover frequency.
AC power: User selectable line voltage;
115 VAC/60 Hz (6.3A Fuse); 230 VAC/50 Hz (3A Fuse).
Mechanical
Permanently attached feet with anti-slip rubber pads.
Dimensions: 11-3/4” high x 11-3/4” wide x 11-3/4” deep.
(add 3/4” for grill; add 1-1/2” for feet).
Weight: 19.2 pounds.
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AIRMOTIV S8 Flex SubwOOFeR
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STATUS
Airmotiv S8 Flex Subwoofer Controls
All of the controls and input connections on the Airmtiv S8 Flex Subwoofer are on the rear panel.
1. High-Pass Crossover Frequency
This switch selects the crossover frequency for the high-pass lter portion of the internal bass
management on the Flex Sub. This switch controls ONLY the crossover frequency for the high-pass
lter that is applied to the Line Level Outputs on the Flex Sub.
2. Line Level Outputs
Connect the Line Level Outputs to the input on your power amp if the Flex Sub is providing bass
management for your system. These outputs provide an audio signal that has been processed by
the user congurable high-pass lter portion of the internal bass management on the Flex Sub.
3. Stereo Line Level Inputs
Use the Stereo Line Level Inputs to connect the Flex Sub to a line level source that has stereo full
range outputs.

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AIRMOTIV S8 Flex SubwOOFeR
4. LFE Line Level Input
Use the LFE Line Level Input to connect the Flex Sub to the Subwoofer Output on a home theater
AVR or pre/pro. Also use this Input to connect the Flex Sub to the Subwoofer Output from a device
like the Emotiva PT-100, which provides a summed mono output for a subwoofer, but doesn’t
include internal bass management capabilities.
5. High Level Inputs
Use the High Level Inputs to connect the the Flex Sub directly to the Speaker Outputs on an AVR
or amplier that doesn’t have line level outputs.
WARNING: Because this connection uses a common ground, it should NOT be used with
ampliers that have fully balanced outputs, like our XPA-DR2 or PA-1.
Note: When you use this connection, your main speakers continue to receive a full-range
audio signal. At the same time, the bass management feature in the Flex Sub extracts the low
frequency content and routes it to the internal amplier in the Flex Sub.
Note: Some people nd that they get a more seamless integration between their subwoofer and
their main speakers when they use this type of connection. However, a line level connection
will usually deliver a cleaner signal, with slightly less distortion and noise, and so is usually
recommended.
Note: This connection only draws a tiny amount of current from the speaker drive signal, so it
has virtually no eect on the speaker load impedance seen by your amplier.
6. Volume Control
This control sets the relative gain of your Flex Sub. Use this control to match the amount of
bass delivered by your Flex Sub to the output of your main speakers. If your system has bass
managament, or you’re not sure, just start with this at its center position - with the index mark at
the top. You may then adjust it later to ne tune the sound of your system.
7. X-Over (Crossover) Control
The Airmotiv S8 Flex Sub includes a built-in active crossover. This control allows you to adjust
the crossover frequency of the internal low pass lter for the best match with your main
speakers. If you are using the Flex Sub with a home theater pre/pro or AVR that has its own bass
management, you should set this control to highest frequency setting (fully clockwise - 150 Hz).
If not, then the proper setting will depend on your main speakers, but 80 Hz (about 10 o’clock) is
a good starting point, and is generally considered to be the industry standard crossover point for
subwoofers.
8. Phase Switch
The phase control is used to adjust the phase on the Flex Sub to match the phase of your main
speakers. The best setting here will depend on your main speakers and where your sub is located
in relation to them. Try both switch positions, and then set the switch in the position where you
hear the most low bass at your listening position.

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AIRMOTIV S8 Flex SubwOOFeR
9. Power Mode Switch (and Status LED)
Note: Your Flex Sub will only operate if the AC POWER Switch is turned ON. If the AC POWER
Switch is OFF, your Flex Sub will NOT operate.
When the Power Mode Switch is set to On, the Flex Sub will remain On continuously.
When the Power Mode Switch is set to Auto, the Flex Sub will turn On automatically when
incoming audio is detected. Once the Flex Sub is On, it will remain On for several minutes; if no
audio is detected after several minutes, the Flex Sub will return to Standby Mode.
The Status LED is located between the Volume Control and X-Over Control and shows the current
status of the Flex Sub. The Status LED illuminates Red when the Flex Sub is in Standby, and is
waiting for an audio signal, and Green when it is fully On. (The Status LED will always remain
Green when the Power Mode Switch is set to On and the AC Power Switch is set to On.)
10. Line Voltage Selector
This switch is used to select the appropriate line voltage for your area.
Note: Be sure to set this switch to the correct line voltage for your area. Failure to do so may
result in damage to your Flex Sub.
11. AC Power Switch
Use this switch to turn the main AC Power to your Flex Sub On and O.
Note: Your Flex Sub will only operate if the AC POWER Switch is turned ON. If the AC POWER
Switch is OFF, your Flex Sub will NOT operate, and the Power Mode Switch will have no eect.
12. Fuse Holder
To change the fuse in your Flex Sub, remove the power cable, then gently pry the fuse
compartment open. (The fuse holder opens like a drawer.) Replace the fuse with one of the
correct value, replace the fuse drawer, and reinsert the power cable.
Note: If the fuse in your Flex Sub blows repeatedly without apparent reason, then you might
have an electrical fault in your Flex Sub, and you should call Emotiva Technical Support for
assistance.
13. IEC Power Cable Receptacle
The IEC Power Cable receptacle accepts any standard IEC power cable. A high quality commercial
power cable is provided with your Flex Sub.

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AIRMOTIV S8 Flex SubwOOFeR
Subwoofer Placement and Conguration
The best location for your subwoofer will depend on a lot of things - including the acoustics of
your room, the characteristics of your main speakers, and practical considerations like where
you have room for it. Whole books have been written about the subject - and even experts often
disagree. The compact footprint of the Flex Sub simplies the task of nd a location that delivers
the sound you want but doens’t intrude on your room decor.
Some frequently chosen locations include: in the front between your main front speakers,
in a front or rear corner, or in the center of a side wall or rear wall. Each has advantages and
disadvantages, and each may or may not work well in your particular system.
One way of choosing a good location is sometimes humorously referred to as the “subwoofer
crawl”. To use this method, you connect your subwoofer temporarily to your audio system, place
the sub in your normal listening position, where you would normally sit, and play music through
it with plenty of bass. You then crawl around on the oor, stopping and listening at each location
where you’re considering putting your sub. Once you nd the spot where the bass sounds the
best and cleanest, you switch places with the subwoofer, placing it in the location where the bass
sounded the best. This often turns out to be a good location for your sub.
Note: Your Flex Sub contains a powerful yet ecient Class D amplier. While the back plate of
the Flex Sub will get slightly warm in normal use, no special ventilation or clearance is required.
The Airmotiv S8 Flex Subwoofer may be used with a wide variety of dierent systems. How
you congure your Flex Sub will depend on the type of system you have. The following section
provides several typical examples of how the Flex Sub may be connected and congured. Please
feel free to call us at Emotiva Technical Support if you have any questions about how to connect
or congure your Flex Sub.
A properly congured subwoofer should add depth and a solid foundation to your listening
experience, but should not be audible as a separate sound source, and you should not be able
to detect its physical location in the room by listening to it. The visceral low bass delivered by a
subwoofer should simply ll the listening area.
Note: The way your main speakers and sub blend together will sound slightly dierent at
dierent locations in the room. These adjustments should be made by listening at your normal
listening location. If your equipment is located across the room, walk back to your favorite
chair and listen to the results from there each time you make an adjustment.
Note: After you’ve congured everything on your pre/pro, or used your automatic room
correction to do so, you should AVOID changing the Crossover and Phase Control settings on
your Flex Sub, as this will change the way it sounds. However, you may use the Volume Control
to increase or reduce the overall amount of bass to suit your tastes.
WARNING: The Airmotiv S8 Flex Subwoofer has speaker drivers installed on both the front and
BOTTOM surfaces of its cabinet. USE CARE TO AVOID PRESSING ON THE CONE OF THE DRIVER
ON THE BOTTOM OF THE CABINET WHEN LIFTING OR HANDLING THE FLEX SUB. DO NOT set the
Flex Sub on soft surfaces that may touch or press against the driver on the bottom side.

Page 13
AIRMOTIV S8 Flex SubwOOFeR
System Conguration #1
System: A surround sound preamp/processor, A/V receiver, or stereo preamp, with
built-in bass management and a subwoofer output.
Connections:
• Connect the subwoofer output of your AVR, processor, or preamp to the LFE Input on
the Flex Subwoofer. If your source component has stereo subwoofer outputs, you may use
the separate Left Input and Right Input on the Flex Sub. If your source component only
has a balanced subwoofer output or outputs you may need to purchase a low cost passive
balanced-to-unbalanced adapter or adapter cable.
Conguration:
• Set the Power switch to Auto so your Flex Sub will turn on automatically when the music
starts.
• Set the Volume control to its center position.
• With the Phase switch, try both settings, and leave it set in the direction where you hear the
most low bass at your listening position.
• Set the X-Over control to its highest setting (fully clockwise, 150 Hz).
• The setting on the High-Pass Crossover Frequency switch doesn’t matter.
Notes:
• Connect your main power amp and speakers as you normally would.
• Follow the instructions on your AVR or processor for adjusting the bass management, or for
using their built-in room correction software.
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OUTPUTS
SUBWOOFER
OUTPUT

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AIRMOTIV S8 Flex SubwOOFeR
System Conguration #2
System: A surround sound preamp/processor, A/V receiver, or stereo preamp, with a
subwoofer output, but with no built-in bass management.
Connections:
• Connect the subwoofer outputs of your AVR, processor, or preamp, to the Left Input and
Right Input on the Flex Subwoofer. If your source component has a single subwoofer output,
you may simply connect it to the Left Input on the Flex Sub. If your source component only
has a balanced subwoofer output or outputs you may need to purchase a low cost passive
balanced-to-unbalanced adapter or adapter cable.
Conguration:
• Set the Power switch to Auto so your Flex Sub will turn on automatically when the music
starts.
• With the Phase switch, try both settings, and leave it set in the direction where you hear the
most low bass (at your listening position).
• Adjust the X-Over control so you get the smoothest transition between the Flex Sub and your
main speakers. The correct setting will depend on your room and your other speakers.
• Adjust the Volume control so that the level of the Flex Sub matches the level of your other
speakers. The output of the sub should blend smoothly with your other speakers and you
should not hear the sub as a separate source of sound.
• The setting on the High-Pass Crossover Frequency switch doesn’t matter.
Notes:
• Connect your main power amp and speakers as you normally would.
• Once you set the Volume and X-Over controls on the Flex Sub, leave them alone, and use the
controls on your processor or preamp to control the level of your entire system.
• You may wish to consider System Conguration #3.
It requires more cables, but has the benet of a true crossover, with an active high-pass lter.
The high pass lter limits the low frequency content being sent to your main speakers,
reducing the power requirements on the amplier powering them, and reducing the
demands on the speakers themselves.
A
+
-
60 HZ
80 HZ
100 HZ
OUT IN
L
R
LFE
L
R
HIGH LEVEL IN
POWER AMPLIFIER PREAMP / PROCESSOR
INPUT MAIN
OUTPUTS
SUBWOOFER
OUTPUT

Page 15
AIRMOTIV S8 Flex SubwOOFeR
System Conguration #3
System: A stereo preamp or processor that has line-level connections to a separate
power amp but lacks a separate subwoofer output.
Connections:
• Disconnect the outputs of your preamp or processor from the inputs of your power amp and
connect them to the Left Input and Right Input on the Flex Sub.
• Connect the Left Output and Right Output of your Flex Sub to the left and right inputs on
your power amp.
Conguration:
• Set the Power switch to Auto so your Flex Sub will turn on automatically when the music
starts.
• With the Phase switch, try both settings, and leave it set in the direction where you hear the
most low bass (at your listening position).
• Set the High-Pass Crossover Frequency switch to select the bass management crossover point
for your system. The industry standard setting is 80 Hz, which is a good starting point, but you
may nd that one of the other settings provides for a smoother transition with your particular
speakers.
• Start with the X-Over control set to the same frequency as you’ve chosen for the High-Pass
Frequency setting. However, you may need to adjust it so you get the smoothest transition
between the Flex Sub and your main speakers. The correct setting will depend on your room
and your other speakers.
• Adjust the Volume control so that the level of the Flex Sub matches the level of your other
speakers. The output of the sub should blend smoothly with your other speakers and you
should not hear the sub as a separate source of sound.
Notes:
• For best noise performance, try to keep the cable lengths between your source, your amplier,
and your Flex Sub as short as possible.
A
+
-
60 HZ
80 HZ
100 HZ
OUT IN
L
R
LFE
L
R
HIGH LEVEL IN
PREAMP / PROCESSOR
MAIN
OUTPUTS
POWER AMPLIFIER
INPUT

Page 16
AIRMOTIV S8 Flex SubwOOFeR
System Conguration #4
System: An AVR or integrated amplier that has no line level outputs or internal bass
management.
Connections:
• Connect an extra set of speaker cables from the output of your amplier to the High Level
Inputs on the Flex Sub.
Conguration:
• Set the Power switch to Auto so your Flex Sub will turn on automatically when the music
starts.
• With the Phase switch, try both settings, and leave it set in the direction where you hear the
most low bass (at your listening position).
• Adjust the X-Over control so you get the smoothest transition between the Flex Sub and your
main speakers. The correct setting will depend on your room and your other speakers.
• Adjust the Volume control so that the level of the Flex Sub matches the level of your other
speakers. The output of the sub should blend smoothly with your other speakers and you
should not hear the sub as a separate source of sound.
Notes:
• You may connect the Flex Sub to the speaker terminals on your amplier or the terminals on
your speakers. You should use actual speaker wire for this connection. However, because very
little current ows through this connection, using thin gauge speaker cables for this will not
compromise performance.
WARNING:
DO NOT connect an amplier with a balanced output to the High-Level Inputs on the Flex Sub.
This input uses a common ground, which is incompatible with most ampliers that have fully
balanced outputs, and may cause distortion, or damage to the amplier, if connected to them.
(Please call us if you have any doubts.)
A
+
-
60 HZ
80 HZ
100 HZ
OUT IN
L
R
LFE
L
R
HIGH LEVEL IN
A/V RECEIVER or
INTEGRATED AMP
R
SPEAKER
OUTPUTS
L