MTX Audio Speaker SW1 User Manual

SW1  
Powered Home Subwoofer  
Owner’s Manual  
1 Mitek Plaza  
Winslow, IL 61089  
815-367-3000  
800-225-5689  
21A6278  
 
SAFETY SYMBOLS AND STATEMENTS  
SPECIFICATION  
Amplifier Type:  
Frequency response:  
Lo-pass xover  
Inputs:  
Class A/B  
40 Hz - 160 Hz  
60 Hz - 160 Hz at 18 dB per octave  
Line level and speaker level full range  
Line level  
Outputs:  
Hi-pass subsonic filter:  
Polarity switch:  
18 dB per octave below 30 Hz  
Normal (0 degrees)/reverse (180 degrees)  
Amplifier  
Power: (continuous)  
Driver  
100 watts  
Size:  
10”  
Voice coil diameter:  
Dimensions  
Height:  
1-1/2”  
15-1/2”  
15”  
Width:  
Depth:  
17”  
Weight  
System:  
34.5 lbs  
41.5 lbs  
Shipping:  
Specifications subject to change without notice.  
14  
 
IMPORTANT SAFETY INSTRUCTIONS  
IN CASE OF TROUBLE  
1. Read Instructions – All the safety and operating  
instructions should be read before the product is  
opened.  
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.  
of the polarized plug.  
Your new subwoofer, once set-up and adjusted, should give you years of listening  
enjoyment with your favorite movies and music. However, if you should experience  
a problem with your unit, the following chart should help you locate the trouble:  
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.  
15. Outdoor Antenna Grounding – If cable system is  
connected to the product, be sure the cable system  
is grounded so as to provide some protection against  
voltage surges and built-up static charges.  
16. 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.  
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.  
4. Follow Instructions – All operating and use  
Problem  
Diagnosis  
A) Muting circuit is defective.  
Return unit for repair.  
instructions should be followed.  
1) Subwoofer makes loud noise at turn-on.  
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  
product in the cleaning description otherwise required  
in above 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 bath tub, wash bowl,  
kitchen sink, or laundry tub; in a wet basement; or  
near a swimming pool; and the like.  
2) Subwoofer has no output.  
a) Status LED off  
A) Line cord is not plugged in.  
B) Line fuse is blown. Unplug line cord  
from wall outlet,then check fuse.  
C) Internal fuse is blown. Return unit for  
repair.  
A) No signal is reaching the unit.  
Check connections from receiver or  
preamplifier.  
B) Power switch is turned off. Place switch  
to “stand by” or “on” mode.  
A) Signal is present, but input level control  
is set at minimum.  
b) Red light on  
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.  
c) Green light on  
8. Accessories – Do not place this product on an  
unstable cart, stand, tripod, bracket, or table. The  
product may fall, causing  
20. a) When the power-supply cord or plug is  
3) Subwoofer has little output.  
A) Input level control is set too low.  
B) If using high level inputs, right and left  
channels are connected out of phase.  
Check wiring.  
serious injury to a child  
damaged.  
or adult, and serious  
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.  
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  
4) Subwoofer output is distorted at high  
volume.  
A) Volume of subwoofer is too high,  
causing amplifier to be over driven.  
Reduce setting of input level control.  
B) Signal from receiver, amplifier, or  
preamplifier is distorted from being over  
driven. Reduce main system volume or  
bass tone control.  
follow the manufacturer’s  
instructions, and should  
use a mounting accessory recommended by the  
manufacturer.  
e) If the product has been dropped or damaged in  
any way.  
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.  
21. Replacement Parts – When replacement parts  
are required, be sure the service technician has used  
replacement parts specified by the manufacturer or  
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.  
C) Subwoofer electronics are defective.  
Return unit for repair.  
5) Subwoofer output is distorted at low  
volume.  
A) Signal from receiver, amplifier, or  
preamplifier is distorted from defective  
electronics.  
B) Signal connecting wires to subwoofer  
are shorted. Check wiring.  
C) Subwoofer electronics are defective.  
Return unit for repair.  
6) Subwoofer makes hum or buzzing  
noises.  
A) Grounding problem or ground loop  
condition. Check wiring.  
B) Isolate problem by removing all  
connecting cables and turning up  
subwoofer input level control. If noise is  
still present, subwoofer electronics are  
defective. Return unit for repair.  
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  
13  
 
OPERATION  
After you have connected your subwoofer, adjusted it for proper operation with the  
rest of your system, and experimented to find the best location for it, it’s time to sit  
back and enjoy it. As you do, here are some hints for getting the most out of your  
subwoofer.  
POWERED HOME SUBWOOFER  
OWNER’S MANUAL  
A) The subwoofer’s level control is designed to adjust the balance between your  
subwoofer and main stereo speakers and should not be used as a substitute  
for the bass or loudness controls on your amplifier or receiver. If more bass is  
desired, advance the bass or loudness controls on your main amplifier or receiver.  
Table of Contents  
B) Your subwoofer’s auto turn-on-turn-off feature allows “set it and forget it”  
operation by keeping the electronics in a standby mode until a signal is detected,  
which turns the amplifier on instantly. When there is no signal present after a  
few minutes, the electronics will again shut down to the standby mode. We do  
suggest that you turn the subwoofer off by its power switch if it is to be unused  
for an extended period of time. For additional protection against damage from  
lightning, we recommend unplugging the line cord.  
Introduction........................................................................2  
Unpacking/pre-installation instructions ..............................3  
Glossary.............................................................................3  
Explanation of features and controls.................................4  
Placement or positioning ...................................................6  
Wiring and connections .....................................................7  
Set-up and adjustment ....................................................11  
Operation.........................................................................12  
Care and cleaning ...........................................................12  
In case of trouble.............................................................13  
Specifications...................................................................14  
C) The tone controls on your preamplifier, receiver, or amplifier should be  
used with caution and care. Excessive boost in certain frequency ranges can  
cause heavy demands on amplifier and loudspeaker components resulting in  
overheating, distortion, mechanical overload, and premature failure.  
CARE AND CLEANING  
Your subwoofer is finished in a durable vinyl and may be wiped clean with a damp  
cloth as needed when the power switch is turned off.  
12  
 
CONGRATULATIONS...  
SET-UP AND ADJUSTMENT  
... on your purchase of a MTX powered home subwoofer system. Your new  
subwoofer is one of the most exciting home entertainment electronic products  
available, adding impact and realism to recorded music and the wide variety of  
movies to be found on videotape, laser disc, DVD and off-the-air broadcasts.  
After you have selected an initial location for your subwoofer and have connected  
it into your system, have a seat in your normal listening position and have  
someone help you with the following adjustments:  
A) If you are using the line level inputs and your main speakers are receiving  
a full range signal, set the subwoofer crossover frequency control to its full  
counterclockwise position of 60 Hz.  
Once set-up and properly adjusted, it should give you many years of  
entertainment pleasure.  
Your subwoofer is a high value product built in America using the latest materials,  
technology, and equipment by MTX, a vertically integrated company.  
Thank you for selecting MTX in making your audio equipment purchase.  
B) Set the polarity switch to the “normal” position and the level control to the full  
counterclockwise position at “minimum”.  
C) Turn off the loudness control and set the bass tone control on your main  
amplifier to the flat position.  
INTRODUCTION  
Your new subwoofer has many features which help to deliver its great bass  
performance and make it a remarkable value in home theater products.  
D) Use familiar program material that has substantial bass content and play your  
main system at a moderate volume level.  
* High efficiency amplifier:  
E) Slowly rotate the subwoofer level control clockwise until a good balance is  
achieved between the low frequency output of your subwoofer and the mid bass  
and upper frequencies from your main speakers.  
Your home subwoofer utilizes a modern class A/B amplifier circuit to produce  
high power with a minimum of heat.  
* Versatile hook-up and operation:  
Your new subwoofer has a variety of input and output connections that make it  
easy to set-up and use in almost any stereo or home theatre system.  
F) Change the polarity switch from “normal” to “reverse” to determine which  
position results in the most overall bass output. Leave the switch in the position  
that gives the highest output level.  
* Low distortion woofers:  
Each woofer uses an overhung voice coil and large excursion suspension to  
produce higher sound pressure levels with lower distortion.  
G Slowly rotate the subwoofer crossover frequency control clockwise to attain  
the best blend between the level of the subwoofer and the main speakers in the  
midbass crossover region. Advancing the control too far will cause a “boominess”  
in the overall sound and will add an unnatural “chesty” quality to male voices.  
* Optimal enclosures:  
Each enclosure is designed to match the parameters of its woofer to maximize  
performance. Special low noise vents are used for less distortion at the  
bottom of the frequency range.  
2
11  
 
B) For use with A/V preamps and receivers that have 5.1 channel line level  
outputs.  
UNPACKING/PRE-INSTALLATION INSTRUCTION  
If your preamplifier or receiver has a single “subwoofer” output or “LFE” output,  
connect a shielded cable from the preamplifier output to either one of the  
subwoofer line level inputs. Refer to Figure E.  
Unpack your new subwoofer carefully, keeping the carton and packing material for  
future use. Also, write the serial number in your home records for later reference.  
Check the condition of your unit, reporting any damage which may have occurred  
in transit to your dealer or shipping company.  
GLOSSARY  
The following list of terms with their definitions is offered as a help in  
understanding the set-up and operation of your subwoofer.  
Crossover (xover) - an electrical filter with lo-pass or hi-pass characteristics  
that divides the frequency range into bands of low, middle, or high frequencies to  
match the capabilities of specialized loudspeakers like subwoofers that are only  
effective at reproducing limited frequency ranges. The crossover frequency is the  
frequency where the filter begins to attenuate or reduce the level of the signal.  
Preamplifier  
OUTPUTS  
Full range - refers to signals which cover the entire audio frequency span from 20  
Hz to 20 kHz.  
SUB  
Hi-pass - a type of filter circuit that allows high frequencies to pass, while  
reducing the level of low frequencies with the transition from high to low occurring  
at the crossover frequency. The rate of reduction of the signal is called the  
attenuation rate or slope and is measured in decibels (dB) over a change in  
frequency of one octave which is a doubling or halving of frequency.  
Impedance - the resistance to the flow of current in an alternating current circuit  
(such as with music). Line level circuits are typically a high impedance of several  
thousand ohms, while speaker level circuits are usually a low impedance of a few  
ohms.  
Line level - the type of signal produced at the outputs of preamplifiers, tape  
decks, CD players, etc., with a typical value of a volt or less in a high impedance  
circuit. Sometimes called low level signals, they are routed using shielded cables  
which are usually terminated with RCA phono connectors.  
Lo-pass - a type of filter circuit that allows low frequencies to pass, while reducing  
the level of high frequencies with the transition from low to high occurring at the  
crossover frequency. The rate of reduction is called the attenuation rate or slope  
and is measured in decibels (dB) over a change in frequency of one octave which  
is a doubling or halving of frequency.  
FIGURE E  
Speaker level - the type of signal produced at the outputs of power amplifiers  
that may be many volts in a low impedance circuit. Sometimes called high level  
signals, they are routed using two conductor unshielded wire of 18 gauge or  
larger. Connections are usually made with stripped ends of wire gripped in spring  
loaded terminals.  
10  
3
 
Installation using line level inputs  
EXPLANATION OF FEATURES AND CONTROLS  
A) Using a preamp or receiver with line level outputs.  
Refer to figure A.  
If a preamplifier output is available on your receiver, or you have a preamplifier,  
connect it to the stereo line level RCA type input jacks on your subwoofer. Use  
quality shielded cables and connectors. Connect one set of shielded cables from  
the preamplifier output to the subwoofer input. Connect a second set of cables  
from the subwoofer outputs to the input of the power amplifier for your main stereo  
speakers.  
1) Polarity switch: This two position switch allows the best match of acoustic  
output between the subwoofer and the main stereo speakers in the region of the  
crossover frequency between them. The “normal” position maintains phase from  
input to output, the “reverse” position changes polarity or phase by 180 degrees.  
2) Power switch: This three position switch controls the power status of the  
subwoofer.  
Note: Do not use the tape monitor output from your receiver or preamplifier  
because its signal level will not vary with the setting of the preamp volume control.  
Off: Turns the unit off.  
Auto: Places the unit in the standby mode, in this mode the subwoofer will  
automatically turn on when an audio signal is applied to either the high or low  
level inputs.  
On: Turns the unit on regardless of whether a signal is present or not.  
3) Subwoofer crossover : This rotary control adjusts a variable low pass filter to  
set the upper frequency at which the output of the subwoofer begins to roll-off.  
Continuously variable from 60 Hz to 160 Hz, it matches the upper frequency  
characteristics of the subwoofer to the low frequency response of the main stereo  
speakers.  
Preamplifier  
OUTPUT  
4) Line level output: These RCA phono jacks provide a line level, stereo output  
that tracks the level of the full range signal at the line level or speaker level  
input. This output is provided for those wishing to “bi-amplify” their main stereo  
speakers.  
L
R
5) Line level input: These RCA phono jacks accept a line level full range signal  
from the preamplifier output of a receiver or preamplifier. This full range signal is  
processed and amplified to power the subwoofer.  
6) Speaker level input: These spring loaded terminals for speaker wire accept a  
stereo, speaker level, full range signal from a receiver or power amplifier. This  
signal is processed and amplified to power the subwoofer.  
Power Amplifier  
7) Fuse: For continued protection replace fuse with same type and size listed.  
INPUT  
8) Level control: This rotary control adjusts the level of the subwoofer and is used  
to balance its volume with that of the main stereo speakers.  
L
-
R
-
+
+
9) Status LED: This two color light emitting diode shows the status of the  
subwoofer electronics. “Red” indicates that the amplifier is plugged in and  
the power switch is either off or in standby mode with no input signal present.  
“Green” indicates that the amplifier is operating with signal present at the input  
from the preamplifier, receiver, or power amplifier.  
-
+
+ -  
Right  
Speaker  
Left  
Speaker  
FIGURE D  
9
4
 
B) For amplifiers with two sets of speaker connections.  
An alternate method of connecting your subwoofer and main speakers is possible  
if you have a receiver or amplifier that can accommodate two sets of speakers  
that can be switched on at the same time and be connected in parallel. (Note that  
some receivers and amplifiers connect “A” and “B” sets of speakers in series, not  
parallel. A series wiring will not allow this alternate connection method for your  
subwoofer. Consult the owner’s manual for your receiver or amplifier to find out  
which type of connection is used for “A” and “B” sets of speakers.)  
3
9
8
2
Make one set of connections from the “A” speaker outputs of your receiver  
or amplifier to the speaker level inputs of your subwoofer and another set of  
connections from the “B” speaker outputs of your receiver or amplifier to your  
main stereo speakers. Switch both “A” and “B” speakers to the “on” position. Refer  
to figure C.  
Left  
Speaker  
Right  
Speaker  
1
-
+
+
-
L
L
R
R
+
-
+
-
-
+
-
+
5
4
Receiver  
or  
Power Amplifier  
6
7
FIGURE C  
FIGURE A  
8
5
 
WIRING AND CONNECTIONS  
PLACEMENT OR POSITIONING  
Turn off all power to your subwoofer and other equipment before making  
any connections.  
Your new subwoofer will work well in a variety of locations. However, placement  
in your listening room will affect its performance. Since the wavelengths of sound  
reproduced by your subwoofer are large compared to its size, those sounds are  
omni-directional in nature. This means that locating your subwoofer in relation  
to your left and right main speakers will not affect the directional cues which they  
provide.  
Installation using speaker level inputs  
A) For amplifiers with one set of speaker connections.  
If a preamplifier output connection is not available on your amplifier or receiver,  
your subwoofer can be connected using your equipment’s speaker outputs.  
These connections are made using commonly available 18 or 16 gauge lamp cord  
or speaker hook-up wire. Observe correct polarity by connecting red(+) to red(+)  
and black(-) to black(-) for both left and right channels. Connect your amplifiers  
speaker output terminals to the subwoofer’s speaker level input terminals as well  
as to your main stereo speakers according to figure B.  
Because the sounds you hear are a combination of direct sound from the speaker  
and reflected sound from the walls, ceiling, and floor of your listening room,  
placement of the subwoofer in relation to room boundaries changes the balance  
of what you hear at low frequencies. In that low frequency range, the dimensions  
of most rooms are comparable to the wavelengths of those sounds. As sound  
propagates and reflects in the room, “standing waves” are created at frequencies  
where the wavelength of sound or multiples of the wavelength are equal to one  
of the dimensions of the room. At your listening position, these standing wave  
patterns of reflected sound add together in and out of phase causing large  
variations in the response that you hear.  
Right  
Speaker  
Left  
Speaker  
As a general rule, locating your subwoofer near the corner of the room will  
increase its overall output, but will excite more standing waves in the room and  
may result in a more uneven response. Locating your subwoofer along a wall  
will usually mean less acoustic output but a somewhat smoother response. A  
middle of the room location would suggest the smoothest response with the least  
output capability. Of course, any location will be a compromise between acoustic  
performance and the aesthetic blend of the subwoofer enclosure with the decor  
and furnishings of your room. Don’t be afraid to experiment with the location of  
your subwoofer in your room for the best results at your listening position. As with  
any other listening test, use program material that you are familiar with that has  
substantial bass content.  
-
+
+
-
L
R
+
-
-
+
Receiver  
or  
Power Amplifier  
FIGURE B  
7
6
 

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