Infinity BU-2 User manual

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POWEREDSUBWOOFER
iF
Owner'sManual
Notice13'Emploi

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triangle, is intended to alert the user to the presenceof uninsulated
"dangerous voltage" within the product's enclosure that may be of
sufficient magnitudeto constitute a risk of electricshock to persons.
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the user to the presence of important operating and maintenance
(servicing) instructions in the literature accompanyingthe product.
CAUTION:TOPREVENTELECTRICSHOCK,MATCHWIDEBLADEOF
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BU-2POWEREDSUBWOOFER.
il ATTENTION!
PLEASE READ THESE INSTRUCTIONS THOROUGHLY BEFORE ATTEMPTING TO OPERATE YOUR INFINITY
SUBWOOFEI_ BE SURE TO SAVE THIS MANUAL FOR FUTURE REFERENCE. ALSO SAVE YOUR BILL OF SALE, °
AS IT IS REQUIRED FOR WARRANTY SERVICE.
f
UNPACKING
Check your subwoofer carefully. If it has been damaged in
transit, report the damage immediately by calling your dealer
and/or the trucking firm that delivered it.
To prevent fire or shock hazard, DO NOT EXPOSE
THIS SUBWOOFER SYSTEM TO RAIN OR EXCESSIVE
MOISTURE. To avoid electrical shock, DO NOT OPEN
THE SUBWOOFER! There are no user serviceable parts
inside. Observe all warnings and cautions.
A FEWSUGGESTIONS
We recommend that you not operate your speakers or
subwoofer with the bass, treble and loudness controls set to
full boost. This will place undue strain on your electronics and
speakers and could damage them.
The volume control setting on your preamplifier or stereo
receiver is not aspecific indication of the overall loudness level
of the speakers. The only important consideration is the
loudness level at which the system can be played regardless of
where the volume control is set.
Always turn down the volume control setting on your
preamplifier or stereo when changing a cassette or CD, or
switching inputs to AM or FM operation. Excessively loud
transients (clicks or popping sounds) can damage the satellite
speakers and possibly the subwoofer.
Whenever changing cables, pulling plugs, etc., ALWAYS
TURN OFF ALL EQUIPMENT including the Subwoofer.
This prevents transients from entering the speakers and
prevents electrical energy from reaching you. Keep all
connections out of the reach of children.
ABOUTTHIS PRODUCT
The Infinity BU-2 Powered Subwoofer has been designed to
enhance the bass frequencies of any audio system. This
subwoofer may be used with speakers of any size. Obviously,
the greatest bass enhancement will be achieved when the
subwoofer is connected with speakers which do not have the
capability to create deep bass. This subwoofer may be used
individually, or combined with another BU-2 for even more
impressive reproduction of bass frequencies (i.e., one subwoofer
near the satellite speakers and asecond subwoofer behind the
primary listening area or both subwoofers up front).
The BU-2 is a self-powered system utilizing a solid state,
low frequency monophonic amplifier driving aspecially
designed woofer mounted within astructurally rigid, tuned
port enclosure.
SPECIFICATIONS
FREQUENCY RESPONSE .................... 30 to 150 Hz, + 3dB
CROSSOVER FREQUENCY ........................... 50 to 200 Hz,
.............................................................. Continuously Variable
INPUT SENSITIVITY ............................... Low Level: 70 mV
..................................................................... High Level: 1.7 V
INPUT IMPEDANCE ................................ Low Level: 12 kfl
.................... _ .............................................. High Level: 5kfl
OUTPUT ............................................................... 100 Wrms
DRIVER ............................................................... 12" Woofer
CABINET FINISH ................................................ Ebony Pica
DIMENSIONS ..................... 141/2" Wx 14%" H*x 141/2.. D
.................................. (36.8 cm W x 36.8 cm H* x 36.8 cm D)
.................................. *Does nor include 1314'(4.5 cm) for feet

POSITIONING
Since the installation of a subwoofer is somewhat more
complicated than installing full range speakers, kis essential
you .read this section very carefully prior to connecting the
subwoofer to your system. Should you have questions relating
to your installation, it is advisable to call either your dealer or
Infinity's Customer Service Department for advice.
The performance of the subwoofer is directly related to its
placement in the listening room and how you align the
subwoofer with.its satellite speakers. Setting the volume of the
subw0ofer in relationship to the left and right speakers is also
of critical importance because it is essential that the subwoofer
integrates smoothly with the entire system. Setting the
subwoofer's volume level too high will result in an
overpowering, boomy bass. Setting the volume level too low
will negate the effect of the subwoofer.
The metal plate acts as the heat sink for the subwoofer's
internal amplifier. Do not place pillows or other objects
against it.
We recommend placing the BU-2 at least. 2 to 3 feet away
from a television or a computer's disc drive system to prevent
smearing the colors of the TV picture or erasure of the
magnetic drive.
Here are several additional facts on installation which may
prove useful. It is generally believed by most audio authorities
that low frequencies (below 125 Hz) are non-directional and,
therefore, placement of a subwoofer within any listening room
is not critical. While in theory it is true that extremely low
frequencies because of their larger wave lengths are basically
non-directional, the fact is when installing a subwoofer within
the limited confines of a room, reflections, standing waves and
absorptions generated within the room will strongly influence
the performance of any subwoofer system. As a result, specific
location of the subwogfer becomes important, and we strongly
recommend that you experiment with room placement before
choosing a finallocation.
Placement will depend upon your room and the amount
and quality of bass required. For example, if your room
permits placement of the subwoofer near either satellite.
Never place the port too close to awall or piece of furniture, as
this will prevent the port from operating properly. Since the
port is an integral part of the subwoofer's design, it should
always be permitted free access to the listening room without
obstruction to the pressure emerging from it. Careful
experimentation will enable you to determine the best position
for the subwoofer.
Here are some useful hints:
1. Experimentation with the port direction may be useful. Ax-'-
times directing the port away from the listening area (to the
side) may be advantageous because this may create a better
blend of basswithin the listening room.
2. If bass response seems inadequate, move it closer to a wall
or corner. If bass becomes too heavy, try turning the"
subwoofer with the port facing away from the wall. This will
tend to diminish bass output.
It will take time and patience to find the most pleasing
acoustic location for your subwoofer. Testing for sonic balance
and blending should always be made for your normal listening
position using a wide range of source material. As a starting
point, initially place the subwoofer behind your right channel
satellite speaker, about 3 or 4 inches from the wall (We
suggest trying this location first because in an orchestra, the
bass instruments are usually located in the back and to the
right.) R_er to Figure 1.
BU-2SUB
RIGHT
CHANNEL
SATELLITE
PRIMARY
LISTENING
AREA'
Figure 1

IDENTIFICATIONOFCONTROLSANDCONNECTINGACPOWER
@
@
@
lnfin
NOT8t.NTABLE FOR tN-WALI.MO_JNTING (_
@ @ @
Figure 2
Refer to Figure 2to identify the controls of you'/-
subwoofer's internal amplifier:
O Auto Power: on/off switch for auto-sensing of audio signal
O-High Level Input and Output terminal strips
@Low Level Input jacks: connect to preamplifier outputs "
@ Volume Control: controls volume of subwoofer
Phase: reverse/normal switch to flip audio signal polarity
Frequency: controls upper comer roll-off point
@ AC Power:.on/off switch for ac power to amplifler
Turn offyour entire audio system prior to connecting your
subwooi_er. Make sure the subwoofer's ON/OFF switch is in
the "OFF" position. If using an unswitched ac outlet on your
receiver or amplifier is not possible, connect your subwoofer to
an unswitched ac wall ot_tlet.
When the Auto Power switch is set to ON (and AC Power
is also ON), the BU-2's auto-sensing circuit will automatically
turn the subwoofer on when music or voice signals are
detected. When audio is absent, the BU-2 will stay in the "on"
mode (as indicated by a green LED) for approximately
8 minutes before the auto-sensing circuit shuts down the
system (as indicated by ared LED). To defeat this feature, set
Auto Power to OFF and use the AC Power switch to turn
on/off the BU-2.
CONNECTINGYOURSUBWOOFER
OUTPUTS (Preampwithtwo I
L.(_)_)R setsofoutputs) I
" ". ............. ... TOSATELLITE
.......... "....... "" SPEAKERAMPLIFIER
L(_)(_ R I
_. o_o
i•LEFT
RIGHT
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.=. 5r.,e •
• [] ,e. -t ÷
lib k,=_ =rp= I_i
I!l!j;iLl!J!l!l!l!!Ll!jn,rr
Figure 3a
•There are several ways to connect your BU-2 subwoofer.
Read this section carefully to determine which method is best
suited for your installation.
The BU-2 may be fed directly with alow-level signal taken
from your preamplifier's output by using the second set of
output jacks on the rear of your preamplifier (see Figure3a). If
your preamplifier has only one set of outputs you may u_e two
(2) =Y" connectors (see Figure 3b) to connect your subwoofer.
Use standard shielded leads terminated at each end with male
RCA connectors. Connect one end of each stereo pair of leads
to your preamplifier's left and right outputs and connect the
other end to the corresponding left and right LOW LE'_EL
INPUTS (1) on the subwoofer.
NOTE: If you are using atube preamplifier and •the
connecting leads will be longer than 10 feet (3 meters), we
recommend not using the above connection method. A tube
preamplifier may not be able to handle the capacitance
introduced by leads over 10 feet in length. Instead, try using.
the high-level connection methods listed on page 5.
3

OUTPUTS (Preampwithone I
L_) _) R setofoutputs) I
...'-- "...
_ =Y"Connector
_...._oSAT_',T_
__. _ :':'"_P_"_,_,,_,_
:y ii ..
•.i_.-::::::::-_" .| .... i_
RIGHT
Figure 3b
When using a single subwoofer, you MUST use a pair qf
stereo low-level leads fromyour preamplifier's outputs. When
using two subwoofers, one for the left and another for the
right channel, connect the left preamplifier output to BOTH---_
the left and right LOW LEVEL INPUTS of the subwoofer
used for the left channel by using a Female-to-Male "Y"
connector at the subwoofer's input and the right channel
preamplifier output to both jacks of the right channel
subwoofer in the same manner (see Figure 4). If the"
preamplifier has a mono subwoofer output, you'll also need a
Male-to-Female ,yo connector to split the mono signal to the
subwoofer pair (seeFigure 4).
(Preampwithmono SUB,rUT I LOUTPUTSR(PreampwithOne
subwooferoutput) OR _) (_) setofoutputs)
Male-to-Female
=Y"Connector
i"••..... •••To Right
"-..... ..---.-. To Left
@@
_) _ • • "* mim ••
• ...... _'" • _:lm_o\ 'in
ILl .,.,m,=,,,i_i \
LEFTBU-2SUBWOOFER
Figure 4
.D
RIGHT
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u O •
m. "_r" i
0[] ÷,. -,.
ta ----,,, : -.
IIIIIIllllllllilllllllUi'i
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RIGHTBU-2SUBWOOFER
4

The BU-2 subwoofer may be connected to your system
using the HIGH LEVEL INPUTS (4) on the plate located on
the rear panel of the subwoofer. Use ordinary lamp cord
maintaining proper polarity (+ to + and - to -). Attach the
lamp cord to the left and right HIGH LEVEL INPUTS on
the subwoofer and the other ends to the proper left and right
OUTPUTS on your amplifier or receiver (see Figure 5).
If you plan to use two subwoofers (one for the left and _e
other for the right channel) connect wires from the left and
right OUTPUT on your power amplifler or receiver and- ....
attach the other ends to the corresponding HIGH LEVEL
INPUTS on each subwoofer. Observe polarity (see Figure 6).
AMPLIFIER
"" OUTPUTS
"RIGHT LEFT
r+ -r-<+7
.:,e_e
@
BU-2SUBWOOFER
Figure 5
AMPLIFIER
OUTPUTS
RIGHT LEFT
r+ -IF-< +l
Figure 6
@
m0
0 IR .m- °,.
IIIIIIIIIIIIIIIiIIIIIIIIII
LEFTBU-2SUBWOOFER
AMPLIFIER
OUTPUTS
RIGHT LEFT
f+ -IF-< +l
Depending on whether you are using one or two BU-2
subwoofers, connecting your satellites can be accomplished in
one of two ways. If you are using asingle BU-2 with a pair of
satellites, connect them as shown in Figure Z
@
n
.'-.o
_ lr
°13
BU-2
SUBWOOFER
@
RIGHTSATELLITE
Figure 7
LEFTSATELLITE

AMPLIFIER
OUTPUTS
RIGHT LEFT
[, _1--',l
@
RIGHTBU-2
SUBWOOFER
RIGHTSATELLITE
@
LEFTBU-2
SUBWOOFER
LEFTSATELLITE
If you are using two BU-2 subwoofers as a stereo pair wi_.
a pair ofsateUites, connect them as shown in Figure 8.
NOTE: The BU-2 subwoofer does not have a built-in
passive crossover which would roll off your satellites' lower-- .....
frequencies. However, the BU-2 does have a variable
frequency control that can be used to block unwanted
frequencies (between 50 "-200 Hz) from being reproduced by
the subwoofer. Where you set this control depends on the low
frequency capabilities of your satellite speakers. Adjust this °
knob to the lowest frequency that your satellite speakers were
designed to reproduce (refer to Operation, step 8).
Figure 8
OPERATION
1. Initially set the BU-2's Volume control E) (Fig. 2) to
12 o'clock.
2. Initially set the BU-2's Frequency control O (Fig. 2) to 12
o'clock.
3. Slide the BU-2's Phase switch O (Fig. 2) to the =NOM"
position (for normal polarity).
4. (Optional) Slide the BU-2's Auto Power switch O (Fig. 2)
to the =ON" position (otherwise "OFF" defeats auto-sensing).
5. Turn on your entire audio system.
6. Turn the Volume control O (Fig. 2) to its mid position. If
no sound emanates from the subwoofer after the auto-sensing
system turns it on (i.e., LED goes from red to green), check
the ac line cord and input cables. Are the connectors on the
cables making proper contact? Is the ac plug connected to a
"live" receptacle? Once you have confirmed that the subwoofer
is active, proceed by playing aCD, record, or cassette. Use a
selection that has ample bass information.
7. Set the overall volume control of the preamplifier orstereo
to a comfortable level. Adjust the subwoofer's Volume control
O(Fig. 27-until you obtain a pleasing blend of bass. Bass
response should not overpower the room, but rather be
adjusted so there is aharmonious blend across the entire
musical range. Many users have atendency to set the
subwoofer volume too loud following the belief that a
subwoofer is there to produce lots of bass. This is not entirely
true. A subwoofer is there to enhance bass, extending the
response of the entire system so the bass can be felt as well as
heard. However, overall balance must be maintained;
otherwise, the music will not sound natural. An experienced
listener will set the volume of the subwoofer so its irfipact on
bass response is always there but is never obtrusive.
8. The Frequency control (_ (Fig. 2) sets the high frequency
roll-off, adjustable from 50 to 200 Hz. Where you set this
control depends on the low frequency capabilities of your
satellite speakers, system placement, and other factors affecting
the mid-bass region. Turn the control UP (clockwise) until
you feel there is too much" mid-bass information (around
100Hz) then back the control down a bit until that area
sounds more natural. To hear more low bass, turn the
Frequency control DOWN a bit and the Volume control UP
by about the same amount. This will increase low bass while
leaving the mid-bass sounding the same as it did before the
adjustment. To reduce low bass without changing mid-bass,
turn the Frequency control UP and the Volume control
DOWN. Alternately slide the Phase switch between "NOM'
and "REV" positions while listening to music. The selection
that sounds the best is the correct adjustment for your system.

9. Room placement of the subwoofer is the most critical
aspect of its installation. It will be necessary for you to try
various locations in your listening room before you choose the
final location. Some possible starting points include: behind
the right channel satellite speaker, along the back wall
between the satellites, along aside wall (but not too close to a
corner), or behind acouch or a chair.
In general, the closer the subwoofer is to walls anti-
corners, the greater the effect of low frequency enhancement.
Experiment with the Frequency and Volume controls in--
different locations until you are pleased with the result you
obtain from your particular application.
A WORDO.EADVICE
The lo_ Frequency rolloff and Volume controls may be set
anywhere within their rotation. However, it will be amost
unusual circumstance if you have to set the Volume control
completely clockwise. This may indicate an unbalanced
condition in your system (too much bass) or an especially large
room, or room placement may not be correct. Try several
other locations before concluding that the Volume control
must be set at maximum.
If the subwoofer is located so far from the listening area that
its effect is not as prominent as desired, try reversing the audio
signal polarity by sliding the Phase switch from NOM to REV.
OVERDRIVEPROTECTION
Automatic limiting circuitry helps prevent overdriving a
connected subwoofer by softly clipping the input signal if it
exceeds apredetermined threshold. Depending on the level,
you may or may not hear slight distortion on musical peaks.
This protection is completely automatic, with no user
adjustments. However, if you do hear distortion continuously
while playing music, the input signal level (feeding the BU-2)
may be too high and should be lowered. If this doesn't solve
the problem, verifi/the connections and check for proper
operation of other components in the audio chain.
AWORD ABOUTTONECONTROLS
The tone controls on your electronic components
(preamplifier, receiver, etc.) should be used with the utmost
discretion. Excessive boost can create severe power demands
on your power amplifier. Maximum bass boost can create a
demand for literally hundreds of watts in the bass region,
whereas, in the *flat" position, or with the tone controls
switched out of the system, your average listening level may be
impressively and realistically loud at less than 10 watts. The
remaining power capacity required is on reserve for power
peaks on sharp transients and powerful crescendos.
i
CAREOFYOURSUBWOOFER
Your Infinity subwoofer cabinet is finished with aheavy
duty, high quality vinyl which requires very little maintenance.
Keep the cabinet clean by dusting it occasionally with adamp
cloth or use agood quality furniture polish to maintain its
original luster. (When using aerosol products, always spray the
cloth, not the speaker, to prevent any of the product from'
drifting onto the electronics of the unit.)
FEEDBACK
If the bass seems boomy, or you notice a rumbling sound
when listening to record albums, the cause may be acoustic
feedback. This means that low frequency vibrations from your
speakers are regching the turntable. To help isolate the
turntable from these vibrations, place the turntable on a
heavy, solid support, as far away as possible from the
subwoofer. If you continue to experience difficulties after"
experimenting with placement, consult your Infinity dealer.
NOTE: CD players are also susceptible to acoustic
feedback and should be placed on solid supports to isolate
them acoustically. Another method to isolate the CD player is
to place it on four isolation feet available at your local dealer.
7

INCASEOFTROUBLEWITHYOURSUBWOOFER"
If the subwoofer sound is distorted, stops playing, or
otherwise seems to be malfunctioning, first determine if the
problem is in the subwoofer or the wiring and/or other audio
components. If the problem also affects the satellite speakers,
the cause is most likely in your electronics. If it is only noticed
in the subwoofer, make sure that all connecting cables are
correct and in proper working condition. Make sure the
subwoofer is plugged in and turned on.
If everything seems to be in good working order and the
subwoofer still malfunctions, DO NOT ATTEMPT ANY
REPAIRS! Contact your Infinity dealer and get the name of
the authorized Infinity service center near you. If there is no_
facility near you, contact Infinity's Customer Service
Department at [phone], or write:
Infinity Systems, Inc. - CUSTOMER SERVICE
•20630 Nordhoff St., Chatsworth, CA 91311 U.S.A.
NOTE: Do not ship your subwoofer for service without prior
approval (RETURN AUTHORIZATION), and do not ship
without enclosing a copy of your original bill-of-sale.
LIMITED WARRANTY
Who is protected by the warranty?.
Your Infinity warranty protects the original retail purchaser
and all subsequent owners, during the stated warranty period,
from any failure as aresult of an original manufacturing defect
so long as: (1) your Infinity product was purchased within the
fifty United States, or purchased by military personnel from an
authorized military outlet, and (2) the original dated bill of
sale is presented whenever service is required during the
warranty period. This warranty does not apply to products
purchased elsewhere; other purchasers should contact their
local Infinity distributor for warranty information.
How long is the warranty period?
Speaker components are covered for parts and labor for a
period of five (5) years. Electronic assemblies are covered for
parts and labor for a period of one (1) year.
What does the Infinity warranty cover?
Except as specified below, this warranty covers all defects in
original materials and workmanship. The following are not
covered: damage caused by accident, misuse, abuse, neglect,
product modification; damage occurring during shipment;
damage caused by failure to follow instructions in the owner's
manual, including failure to perform recommended periodic
or routine maintenance; damage resulting from repairs by
someone not authorized by Infinity; claims based upon any
misrepresentations by the seller; and any Infinity product on
which the serial number has been altered, defaced or removed.
Who pays for what?
During the period that both parts and labor are covered by
this warranty, Infinity will pay all of the labor and material
expenses to repair a warrantable defect; during the period that
parts ONLY are covered by this warranty, Infinity will pay for
all materials to correct warranted defect, but you must pay for
the labor charges.
How can warranty service be obtained?
In the event that your Infinity product requires service,
you should first contact the Infinity dealer from whom the
product was purchased or if this is not practical, contact
Infinity directly (ATTN: Customer Service) at 20630
Nordhoff St., Chatsworth, CA 91311 U.S.A.; (818) 407-
0228. We may direct you to an authorized service center for
Infinity products or askyou to send them to us for repair. In
either case, you must present your original dated bill-of-sale to
establish warranty coverage. Do not send your product to us
without prior authorization from our Customer Service
Department.
You are responsible for transportingyour product for
repair and for payment of all shipping charges; however,
Infinity will pay the return shipping charges (in the event you
return the product to us) if the repairs are covered by
warranty. If you experience difficulty in transporting your
product or are in need of packing materials, please advise us
and we may be able to suggest alternative procedures and/or
provide adequate packing materials.
Limitation of Implied Warranties:
All implied warranties, including fitness for aparticular
purpose and merchantability are limited in duration and
length to the warranty period for your product.
Limitation of Incidental or Consequential Damages:
Infinity is not responsible for any incidental or
consequential damage of any kind. Our liability is limited to
the repair or replacement,'at our option, of a defective
product. Some states do not allow limitations on how a.n
implied warranty lasts and/or do not allow the exclusion of
incidental or consequential damage, so the above limitations
or exclusions may not apply to you. This warranty gives you
specific legal rights and you may also have other rights which
vary from state to state.
NOTE: In the event that there is adifference between this
warranty and the provisions in any advertisements, product
biochures or packaging cartons, the terms of this warranty
will prevail.

IMPORTANTSAFETYINSTRUCTIONS
1) Read Instructions- All the safety and operatinginstructions should be
readbeforethe product is operated.
2) Retain Instructions -The safety and operatinginstructions should be
retainedforfuturereference.
3) Heed Warnings - All warnings on the product and in the operating
instructionsshould be adhered to.
4) FollowInstructions-Alloperatinganduse instructionsshould be
followed.
5) Cleanin_ - Ud_'ugthis product from the walloudetbeforedenning.Do
not useliquidcleanersoraerosolcleaners.Use adampcloth for cleaning.
Exception:A product that is meant for uninterrupted serviceand that-for
some specific reason,such as the possibilityof the loss of an authorization
code for a CATVConverter, is not intended to be unpluggedby the user for
dexning orany otherpurpose, mayexcludethe referenceto unplugging the
product in the product in the cleaning descriptionotherwiserequired in
above5).
6) Attachments - Do not useattachments not recommendedbythe product
manufacturerastheymaycausehazards.
7) Water and Moisture-Do not usethis product nearwater- forexample,
near abath tub, washbowl,kitchen sink, or laundrytub; in a wet basement;
ornear a swimmingpool; and the like.
8) Accessories - Do not place this product on an
unstable cart, stand, tripod, bracket,ortable. The
product may fall,causingserious injury to a child
oradult, and seriousdamageto the product. Use
onlywith a cart, stand, tripod, bracket,ortable
recommended by the manufacturer, or sold
with the product. Artymounting of the product
should follow the manufacturer'sinstructions,
and should use a mounting accessory
recommendedby the manufacturer.
9) A product and cart combination should be
moved with care. Quick stop, excessive force, and
unevensurfacesmaycausethe product and cartcombination to overturn.
10) Ventilation - Slots and openings in the cabinet are provided for
vendhtion and to ensurereliableoperationof the product and to protect it
from overheating,and these openingsmust not be blocked or covered. The
openingsshouldneverbe blockedbyplacing the product on a bed, sofa, rug,
or other similar surface. This product should not be placed in a built-in
installationsuch asa bookcaseor rackunlessproperventilationisprovided or
the manufacturer'sinstructionshave beenadhered to.
11) PowerSources- Thisproduct should be operatedonly fromthe type of
powersource indicated on the marking label.If you are not sure of the type
of power supply to your home, consult your product dealeror localpower
company. For products intended to operatefrom battery power, or other
sources,referto the operatinginstructions.
12) Grounding or Polarization - This product may be equipped with a
polarizedalternating-current line plug (aplug havingone blade widerthan
the other).This plug will fit into the power outletonly one way. This is a
safetyfeature. If you are unable to insert the plug fully inro the oudet, try
reversingtheplug. If the plug shouldstill fail to fit, contactyour dectricianto
replaceyourobsoleteoudet. Do not defeatthe safetypurpose ofthe polarized
plug.
13) Power-CordProtection-Power-supplycords should be routed so that
they are not likely to be walked on or pinched by items placed upon or
against them, paying particular attention to cords at plugs, convenience
receptacles,and the pointwhere theyexit from theproduct.
14) Outdoor Antenna Grounding - If an outside antenna or cable system is
connected to the product, be sure the antenna or cable system is grounded so
as to provide some protection against voltage surges and built-up static
charges. Article 810 of the National Electrical Code, ANSIINFPA 70,
provides information with regard to proper grounding of the mast and
supportingstructur__e,grounding of the lead-in wire to an antenna discharge
unit, size for grou'nding conductors, location of antenna-discharge unit,
connection to grounding electrodes, and requirements for the grounding
dectrode. See Figure A.
Figure A_mr_aA
n
// J-_ _DISCHARGE UNIT
ELECT.,C__I - IT°R
_ EDCLAMPS
•POWER SERVICE GROUNDING
ELECTRODE SYSTEM
(NEC SECTION 810-21)
15) Lightning- For added protectionfor this product duringalightning
storm, or when it is left unattended and unused for long periods of time,
unplug it from the walloutlet and disconnectthe antenna or cablesystem.
This will prevent damageto the product due to lightningand power-line
surges.
16) Power Lines- An outsideantenna systemshould not be locatedin the
vicinityof overheadpower linesor other electriclight or power circuits, or
whereit canfall into such powerlinesorcircuits.When installingan outside
antenna system,extreme care should be taken to keep from touching such
powerlinesorcircuitsas contactwith them mightbe fatal.
17) Overloading- Do not overloadwalloutlets,extension cords, orintegral
conveniencereceptaclesasthiscan resultin a riskoffireor electricshock.
18) Object and Liquid Entry- Never push objectsof any kind into this
product through openingsas they may touch dangerousvoltagepoints or
shott-out parts that could resultin a fireor electricshock. Never spill liquid
ofany kind on theproduct.
19) Servicing- Do not attempt to servicethis product yourselfas openingor
removingcoversmayexposeyou to dangerousvoltageorotherhazards.Refer
allservicingto qualifiedservicepersonnel.
20) DamageRequiringService- Unplug this product from the walloudet
and refer servicing to qualified service personnel under the following
conditions:
a) When the power-supplycord orplugis damaged.
b) If liquidhasbeenspilled,orobjectshavefalleninto the product.
€)If the product hasbeenexposedto rain or water.
d) If the product does not operatednormally by following the opdrating
instructions. Adjust only those controls that arecovered by the operating
instructions as an improper adjustment of other controls may result in
damageand will often require extensivework by a qualified technician to
restorethe product to its normaloperation.
e) ffthe product has beendroppedordamagedin anyway.
t3 When tlie product exhibits adistinct change in l_erformance- thii
indicated a needfor service.
21) RephcementParts -When replacementparks are required,be surethe
servicetechnicianhasused replacement'partsspecifiedby the manufactureror
have the same characteristicsas the originalpart. Unauthorizedsubstitutions
mayresultin fire,dectricshock, or otherhazards.
22) Safety Check - Upon completion of any service or repairs to this
product, ask the servicetechnicianto performsafetychecksto determinethat
the product is in properoperatingcondition.
23) Wall or CeilingMounting - The product should be mounted to a wall
orceilingonlyasrecommendedby the manufacturer.
24) Heat -The product should be situated awayfrom heat sourcessuch as
radiators, heat registers,stoves,or otherproducts (induding amplifiers)that
produceheat.