Infinity BU-80 Speaker

Infinity BU-80 Speaker
BU Series
Powered Subwoofers
Models BU-80, BU-120, BU-150
Owner’s Manual
Part # 200230
®
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
WARNING: SHOCK HAZARD – DO NOT OPEN.
AVIS: RISQUE DE CHOC ELECTRIQUE – NE PAS OUVRIR.
CUIDADO: PELIGRO DE CHOQUE ELECTRICO – NO ABRIR.
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK
DO NOT REMOVE COVER (0R BACK)
NO USER SERVICEABLE PARTS INSIDE
REFER SERVICING TO QUALIFIED PERSONNEL
The lightning flash with arrowhead
symbol, within an equilateral
triangle, is intended to alert the
user to the presence of uninsulated
“dangerous voltage” within the
product’s enclosure that may be of
sufficient magnitude to constitute a
risk of electric shock to persons.
The exclamation point within
an equilateral triangle is
intended to alert the user
to the presence of important
operating and maintenance
(servicing) instructions in the
literature accompanying the
product.
THIS INFINITY PRODUCT IS DESIGNED FOR 120-VOLT USE ONLY! FOR DETAILED SAFETY PRECAUTIONS,
PLEASE SEE FOLLOWING PAGE IN THIS OWNER'S MANUAL FOR “IMPORTANT SAFETY INSTRUCTIONS.”
L’éclair avec le symbole de la flèche, placé dans les limites dun triangel équilatéral est
prévu pour avertir l’utilisateur de la présence de “tension dangereuse” non isolée dans
l’enceinte du produit qui pourrait être d’une importance suffisante pour présenter un
resque d’électrocution aux personnes.
!
Le point d’exclamation dans un triangel équilateral est prévu pour avertir l’utilisateur
de la présence d’instructions importantes pour les opérations et l’entretien (service)
dans les manuels fournis avec l’appareli.
ATTENTION: POUR EVITER LES CHOCS ELECTRIQUES, INTRODUIRE
LA LAME LA PLUS LARGE DE LA FICHE DANS LA BORNE
CORRESPONDANTE DE LA PRISE ET POUSSER JUSQUAU FOND.
Este destello luminoso con un símbolo de punta de flecha dentro de un triángulo
equilátero tiene el objectivo de alertar al usuario sobre la presencia de “voltaje
peligroso” no aislado dentro de la caja del producto que puede ser de magnitud lo
suficientemente grande para constituir un riesgo de choque eléctrico para las personas.
!
Este punto de exclamación dentro de un triángulo equilátero tiene el objectivo de
alertar al usuario sobre la existencia de instrucciones operativas y de mantenimiento
(servicio) importantes en la literatura que acomaña el aparato.
CUIDADO: PARA REDUCIR EL RIESGO DE CHOQUE ELÉCTRICO, NO
RETIRE LA CUBIERTA (O RESPALDO). DENTRO NO HAY PIEZAS A
LAS QUE EL USUARIO PUEDA DAR SERVICIO. REMITA EL SERVICIO
AL PERSONAL DE SERVICIO CALIFICADO.
IMPORTANT SAFETY INSTRUCTIONS
1) Read Instructions – All the safety and operating instructions should be
read before the product is operated.
2) Retain Instructions – The safety and operating instructions should be
retained for future reference.
3) Heed Warnings – All warnings on the product and in the operating
instructions should be adhered to.
4) Follow Instructions – All operating and use instructions should be
followed.
5) Cleaning – Unplug this product from the wall outlet before cleaning. Do
not use liquid cleaners or aerosol cleaners. Use a damp cloth for cleaning.
Exception: A product that is meant for uninterrupted service and that for
some specific reason, such as the possibility of the loss of an authorization
code for a CATV Converter, is not intended to be unplugged by the user for
cleaning or any other purpose, may exclude the reference to unplugging the
product in the cleaning description otherwise required in number 5.
6) Attachments – Do not use attachments not recommended by the product
manufacturer as they may cause hazards.
7) Water and Moisture – Do not use this product near water – for example,
near a bathtub, washbowl, kitchen sink, or laundry tub; in a wet basement;
or near a swimming pool; and the like.
8) Accessories – Do not place this product on an unstable cart, stand, tripod,
bracket, or table. The product may fall, causing serious
injury to a child or adult, and serious damage to the
product. Use only with a cart, stand, tripod,
bracket, or table recommended by the
manufacturer, or sold with the product. Any
mounting of the product should follow the
manufacturer’s instructions, and should use a
mounting accessory recommended by the
manufacturer.
9) A product and cart combination should be
moved with care. Quick stop, excessive force, and
uneven surfaces may cause the product and cart
combination to overturn.
10) Ventilation – Slots and openings in the cabinet are provided for
ventilation and to ensure reliable operation of the product and to protect it
from overheating, and these openings must not be blocked or covered. The
openings should never be blocked by placing the product on a bed, sofa, rug,
or other similar surface. This product should not be placed in a built-in
installation such as a bookcase or rack unless proper ventilation is provided or
the manufacturer’s instructions have been adhered to.
11) Power Sources – This product should be operated only from the type of
power source indicated on the marking label. If you are not sure of the type
of power supply to your home, consult your product dealer or local power
company. For products intended to operate from battery power, or other
sources, refer to the operating instructions.
12) Grounding or Polarization – This product may be equipped with a
polarized alternating-current line plug (a plug having one blade wider than
the other). This plug will fit into the power outlet only one way. This is a
safety feature. If you are unable to insert the plug fully into the outlet, try
reversing the plug. If the plug should still fail to fit, contact your electrician to
replace your obsolete outlet. Do not defeat the safety purpose of the polarized
plug.
13) Power-Cord Protection – Power-supply cords 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 point where they exit from the product.
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, ANSI/NFPA 70,
provides information with regard to proper grounding of the mast and
supporting structure, grounding of the lead-in wire to an antenna discharge
unit, size for grounding conductors, location of antenna-discharge unit,
connection to grounding electrodes, and requirements for the grounding
electrode. See Figure A.
Figure A
ANTENNA
LEAD-IN
WIRE
GROUND
CLAMP
ANTENNA
DISCHARGE UNIT
(NEC SECTION 810-21)
ELECTRIC
SERVICE
EQUIPMENT
GROUNDING CONDUCTORS
(NEC SECTION 810-21)
GROUND CLAMPS
POWER SERVICE GROUNDING
ELECTRODE SYSTEM
(NEC SECTION 810-21)
15) Lightning – For added protection for this product during a lightning
storm, or when it is left unattended and unused for long periods of time,
unplug it from the wall outlet and disconnect the antenna or cable system.
This will prevent damage to the product due to lightning and power-line
surges.
16) Power Lines – An outside antenna system should not be located in the
vicinity of overhead power lines or other electric light or power circuits, or
where it can fall into such power lines or circuits. When installing an outside
antenna system, extreme care should be taken to keep from touching such
power lines or circuits as contact with them might be fatal.
17) Overloading – Do not overload wall outlets, extension cords, or integral
convenience receptacles as this can result in a risk of fire or electric shock.
18) Object and Liquid Entry – Never push objects of any kind into this
product through openings as they may touch dangerous voltage points or
short-out parts that could result in a fire or electric shock. Never spill liquid
of any kind on the product.
19) Servicing – Do not attempt to service this product yourself as opening or
removing covers may expose you to dangerous voltage or other hazards. Refer
all servicing to qualified service personnel.
20) Damage Requiring Service – Unplug this product from the wall outlet
and refer servicing to qualified service personnel under the following
conditions:
a) When the power-supply cord or plug is damaged.
b) If liquid has been spilled, or objects have fallen into the product.
c) If the product has been exposed to rain or water.
d) If the product does not operate normally by following the operating
instructions. Adjust only those controls that are covered by the operating
instructions as an improper adjustment of other controls may result in
damage and will often require extensive work by a qualified technician to
restore the product to its normal operation.
e) If the product has been dropped or damaged in any way.
f) When the product exhibits a distinct change in performance – this
indicates a need for service.
21) Replacement Parts – When replacement parts are required, be sure the
service technician has used replacement parts specified by the manufacturer or
that have the same characteristics as the original part. Unauthorized
substitutions may result in fire, electric shock, or other hazards.
22) Safety Check – Upon completion of any service or repairs to this
product, ask the service technician to perform safety checks to determine that
the product is in proper operating condition.
23) Wall or Ceiling Mounting – The product should be mounted to a wall
or ceiling only as recommended by the manufacturer.
24) Heat – The product should be situated away from heat sources such as
radiators, heat registers, stoves, or other products (including amplifiers) that
produce heat.
INTRODUCTION
ABOUT THIS PRODUCT...
The Infinity BU Series Powered Subwoofers have 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 that
do not have the capability to create deep bass. This subwoofer may be used individually, or
combined with another BU Series subwoofer for even more impressive reproduction of bass
frequencies (i.e., one subwoofer near the satellite speakers and a second subwoofer behind the
primary listening area, or both subwoofers up front).
The BU Series subwoofers are self-powered systems utilizing a solid-state, low-frequency
amplifier driving a specially designed woofer mounted within a structurally rigid, tuned-port
enclosure.
UNPACKING THE SUBWOOFER
IMPORTANT!
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 electric shock, DO NOT OPEN THE SUBWOOFER!
There are no user serviceable parts inside. Observe all warnings and cautions.
A FEW SUGGESTIONS
VOLUME CONTROL...
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 a specific 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.
IMPORTANT!
4 ◆ BU Series Powered Subwoofers – Owner’s Manual
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.
POSITIONING
POSITION WITHIN
A ROOM WILL
STRONGLY INFLUENCE
PERFORMANCE...
Since the installation of a subwoofer is somewhat more complicated than installing full-range
speakers, it is 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 subwoofer 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 subwoofer 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 erasing of the magnetic
drive.
Here are several additional facts on installation that may prove useful. It is generally believed by
most audio authorities that low frequencies (below 125Hz) are nondirectional and, therefore,
placement of a subwoofer within any listening room is not critical. While in theory it is true that
the larger wavelengths of extremely low frequencies are basically non-directional, the fact is that
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 subwoofer becomes important, and we
strongly recommend that you experiment with placement before choosing a final location.
Placement will depend upon your room and the amount and quality of bass required (for
example, whether or not your room permits placement of the subwoofer near either satellite).
Never place the port too close to a wall 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 (see useful hints, next page).
BU Series Powered Subwoofers– Owner’s Manual ◆ 5
Figure 1. This view shows the
subwoofer positioned behind the
right-channel satellite speaker to
re-create the actual location of
bass instruments in an orchestra.
BU SUBWOOFER
RIGHTCHANNEL
SATELLITE
PRIMARY
LISTENING
AREA
Here are some useful hints:
1. Experimentation with the port direction may be useful. At times directing the port away
from the listening area (to the side) may be advantageous because this may create a better
blend of bass within 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 (see Figure 1).
6 ◆ BU Series Powered Subwoofers – Owner’s Manual
IDENTIFICATION OF CONTROLS AND
CONNECTING AC POWER
CONTROLS...
Refer to Figure 2 to identify the controls of your subwoofer’s internal amplifier:
❶ High-Level Input and Output terminals
❷ Low-Level Input jacks: connect to preamplifier outputs
❸ Crossover Frequency: controls upper-corner roll-off point
❹ Power-On Indicator
❺ Phase: reverse/normal switch to flip audio-signal polarity (except BU-80)
❻ Volume Control: controls volume of subwoofer
BEFORE CONNECTING
YOUR SUBWOOFER...
Turn off your entire audio system prior to connecting your subwoofer.
Connect your subwoofer to an unswitched AC wall outlet.
Figure 2.
❹
– R +
+ L –
Low-Level In
SPKR
In
Crossover
Frequency
Power
Volume
L
Phase
SPKR
Out
R
50
❷
❶
150
❸
Min
❺
Max
❻
Digital Technology
120V
60Hz
160W
CAUTION
®
RISK OF ELECTRIC SHOCK
DO NOT OPEN
WARNING: SHOCK HAZARD – DO NOT OPEN.
AVIS: RISQUE DE CHOC ELECTRIQUE – NE PAS OUVRIR.
CUIDADO: PELIGRO DE CHOQUE ELECTRICO – NO ABRIR.
BU Series Powered Subwoofers – Owner’s Manual ◆ 7
CONNECTING YOUR SUBWOOFER
TURN OFF ALL POWER...
There are several ways to connect your subwoofer. Read this section carefully to determine
which method is best suited for your installation.
The subwoofer may be fed directly with a low-level signal taken from your preamplifier’s output
by using the second set of output jacks on the rear of your preamplifier (see Figure 3a). If your
preamplifier has only one set of outputs you may use 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-LEVEL INPUTS (1)
on the subwoofer.
IMPORTANT!
Figure 3a. Low-level signal
can be used from your preamp's
output by connecting second
set of output jacks to the
rear of your amplifier.
If you are using a tube 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 10.
OUTPUTS
L
R
L
(Preamp with two
sets of outputs)
TO SATELLITE
SPEAKER AMPLIFIER
R
LEFT
+ L –
SPKR
In
SPKR
Out
RIGHT
8 ◆ BU Series Powered Subwoofers – Owner’s Manual
SUBWOOFER
PLATE
– R +
Low-Level In
L
R
CONNECTING YOUR SUBWOOFER (CONT.)
Figure 3b. You can use this method
(2 “Y”connectors) if your preamp
has only one set of outputs.
OUTPUTS
L
(Preamp with one
set of outputs)
R
“Y” Connector
TO SATELLITE
SPEAKER AMPLIFIER
LEFT
+ L –
– R +
Low-Level In
SPKR
In
L
SPKR
Out
R
SUBWOOFER
PLATE
RIGHT
When using a single subwoofer, you MUST use a pair of stereo low-level leads from your
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 “Y” connector to split the mono signal to the subwoofer pair
(see Figure 4).
Figure 4. Method when using single
subwoofer or two subwoofers.
SUB OUT
(Preamp with mono
subwoofer output)
OUTPUTS
OR
L
R
(Preamp with one
set of outputs)
Male-to-Female
“Y” Connector
To Left
To Right
+ L –
+ L –
– R +
Low-Level In
SPKR
In
SPKR
Out
LEFT
SUBWOOFER
PLATE
L
SPKR
In
SPKR
Out
R
Female-to-Male
“Y” Connector
– R +
Low-Level In
LEFT
RIGHT
L
R
RIGHT
SUBWOOFER
PLATE
BU Series Powered Subwoofers – Owner’s Manual ◆ 9
CONNECTING YOUR SUBWOOFER (CONT.)
The 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 speaker wire, maintaining proper polarity
(+ to + and – to –). Attach the speaker wire 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 the other for the right channel) connect
wires from the left and right OUTPUT on your power amplifier or receiver and attach the other
ends to the corresponding HIGH-LEVEL INPUTS on each subwoofer. Observe polarity
(see Figure 6).
AMPLIFIER
OUTPUTS
Figure 5. Method when
using single subwoofer.
LEFT
+
+
–
L
–
RIGHT
+
–
–
R
+
Low-Level In
SPKR
In
Crossover
Frequency
Power
L
Phase
SPKR
Out
R
50
150
SUBWOOFER
PLATE
Figure 6. Method when
using two subwoofers.
AMPLIFIER
OUTPUTS
LEFT
+
+
–
L
–
+
–
R
+
+
SPKR
In
SPKR
In
SPKR
Out
SPKR
Out
RIGHT
SUBWOOFER
PLATE
10 ◆ BU Series Powered Subwoofers – Owner’s Manual
RIGHT
–
L
LEFT
SUBWOOFER
PLATE
–
–
R
+
CONNECTING YOUR SUBWOOFER (CONT.)
AMPLIFIER
OUTPUTS
Figure 7. Method when connecting
one subwoofer to satellites.
LEFT
+
+
RIGHT
–
L
+
–
–
–
R
+
Low-Level In
SPKR
In
Crossover
Frequency
Power
Volume
L
Phase
SPKR
Out
R
50
150
Min
Max
SUBWOOFER
PLATE
+
+ –
–
Rear View
Rear View
L. SATELLITE
R. SATELLITE
Depending on whether you are using one or two subwoofers, connecting your satellites can be
accomplished in one of two ways. If you are using a single subwoofer with a pair of satellites,
connect them as shown in Figure 7.
If you are using two subwoofers as a stereo pair with a pair of satellites, connect them as shown
in Figure 8.
AMPLIFIER
OUTPUTS
LEFT
+
Figure 8. Method when connecting
two subwoofers to satellites.
+
LEFT
SUBWOOFER
PLATE
–
L
–
RIGHT
–
R
+
+
SPKR
In
SPKR
In
SPKR
Out
SPKR
Out
+
–
Rear View
L. SATELLITE
IMPORTANT!
+
–
L
RIGHT
SUBWOOFER
PLATE
–
–
R
+
+
–
Rear View
R. SATELLITE
The subwoofer has a variable frequency control that can be used to block unwanted
frequencies (between 50 – 150Hz) 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).
BU Series Powered Subwoofers – Owner’s Manual ◆ 11
OPERATION
SET CONTROLS...
1. Initially set the subwoofer’s Volume control ❻ (Fig. 2) to the minimum position.
2. Initially set the subwoofer’s Crossover Frequency control ❸ (Fig. 2) to 12 o’clock.
3. Set the subwoofer’s Phase switch ❺ (Fig. 2) to the “NOM” position (for normal polarity)
(except BU-80).
POWER ON...
4. Turn on your entire audio system and play any music source.
5. Turn the Volume control ❻ (Fig. 2) to its mid position. If no sound emanates from the
subwoofer, 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?
ADJUST VOLUME...
CROSSOVER FREQUENCY
CONTROL...
ROOM PLACEMENT...
6. Set the overall volume control of the preamplifier or stereo to a comfortable level. Adjust the
subwoofer’s Volume control ❻ (Fig. 2) until you obtain a pleasing blend of bass. Bass
response should not overpower the room but rather be adjusted so there is a harmonious
blend across the entire musical range. Many users have a tendency 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 impact on bass response is always there but is never
obtrusive.
7. The Crossover Frequency control ❸ (Fig. 2) sets the high-frequency roll-off, adjustable
from 50 to 150Hz. 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 Crossover Frequency control DOWN a bit and the Volume
control UP by about the same amount. This will increase low bass while leaving the midbass sounding the same as it did before the adjustment. To reduce low bass without
changing mid-bass, turn the Crossover Frequency control UP and the Volume control
DOWN. Switch 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.
8. 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 a side wall (but not too close to a corner),
or behind a couch or a chair.
In general, the closer the subwoofer is to walls and corners, the greater the effect of lowfrequency enhancement. Experiment with the Crossover Frequency and Volume controls in
different locations until you are pleased with the result you obtain from your particular
application.
12 ◆ BU Series Powered Subwoofers – Owner’s Manual
A WORD OF ADVICE
The Low-Frequency Roll-off and Volume controls may be set anywhere within their rotation.
However, it will be a most 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.
A WORD ABOUT TONE CONTROLS
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.
BU Series Powered Subwoofers – Owner’s Manual ◆ 13
CARE OF YOUR SUBWOOFER
Your Infinity subwoofer cabinet is finished with a heavy-duty, high-quality vinyl which requires
very little maintenance. Keep the cabinet clean by dusting it occasionally with a damp cloth or
use a good 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 reaching 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.
IMPORTANT!
CD players are also susceptible to vibrations 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.
IN CASE OF TROUBLE WITH
YOUR SUBWOOFER
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.
IMPORTANT!
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 (800) 553-3332, or write:
Infinity Systems, Inc. – CUSTOMER SERVICE
250 Crossways Park Drive, Woodbury, NY 11797 USA
14 ◆ BU Series Powered Subwoofers – Owner’s Manual
SPECIFICATIONS – BU SERIES
PERFORMANCE DATA
DRIVE UNITS
FINISH
DIMENSIONS
BU-80
Frequency
Response (±3dB): 45Hz ~ 150Hz
BU-120
BU-150
30Hz ~ 150Hz
28Hz ~ 150Hz
Output (RMS):
75W
150W
200W
Driver:
8"
12"
15"
Crossover
Frequency:
50Hz ~ 150Hz
50Hz ~ 150Hz
(continuously variable) (continuously variable)
50Hz ~ 150Hz
(continuously variable)
Cabinet Finish:
Ebony Pica
Ebony Pica
Ebony Pica
Height:*
11-1/2" (29.2cm)
14-1/2" (36.8cm)
17-3/4" (45.1cm)
Width:
11-1/2" (29.2cm)
14-1/2" (36.8cm)
17-3/4" (45.1cm)
Depth:
11-1/2" (29.2cm)
14-1/2" (36.8cm)
17-3/4" (45.1cm)
43 lbs/19.5 kg
55 lbs/25 kg
* Add 1-3/4" (4.5cm) for feet.
WEIGHT
26 lbs/11.8 kg
BU Series Powered Subwoofers – Owner’s Manual ◆ 15
®
Infinity Systems, Inc.
250 Crossways Park Drive
Woodbury, NY 11797 USA
(516) 496-3400 • FAX (516) 682-3523
P/N: 200230
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