Dual L8SW User Manual

L6SW/L8SW  
INSTALLATION/OWNERS MANUAL  
Powered Subwoofer  
SUBWOOFER SERIES PLACEMENT  
Placement  
Your DUAL subwoofer can be placed in many convenient  
locations in your home, but must be placed on the floor. Do  
not attempt an installation that would elevate the subwoofer  
above floor level. You should experiment with various place-  
ments. Room Acoustics can produce large apparent differ-  
ences in the sound for small changes in the placement  
location and adjustments to subwoofer controls. For  
Example, directing the woofer of a forward firing sub toward  
one’s typical listening position and adjusting the low pass  
filter to 150 Hz can make the sub very directional. This  
means you perceive exactly where the sub is located within  
the room. This is not a desirable result for the most realistic  
audio experience.  
Indoor Placement  
The common thinking regarding subwoofer placement and  
performance is to position and adjust the subwoofer in such  
a way that the subwoofers low frequencies encompasses  
the entire room with deep powerful bass and provides the  
most realistic imaging experience. The amount of bass per-  
ceived increases as you move the subwoofer closer to an  
intersecting wall surface and the highest level of bass  
results are realized from placement in a corner, but should  
be no closer than 3" from the wall surface. The floor and  
corner placement (loading) are actually an important part of  
the Subwoofer’s design. Attempt to place the subwoofer in  
or near the corner closest to your system's receiver to  
ensure the shortest possible wire or cable runs, which will  
result in superior performance.  
3
SUBWOOFER SERIES INSTALLATION  
Connecting Speakers  
IMPORTANT - When you make connections, make sure that the  
power switches of all components, including subwoofer, are OFF.  
Connecting & Adjusting  
Your Subwoofer  
The attached power cord is to be used with a standard AC wall  
outlet (110 volt AC outlet capable of supplying at least 250 Watts)  
Power Cord  
This LED is unlit when the AC power switch is OFF. It glows RED  
when the subwoofer is in standby mode and GREEN when the  
subwoofer is on or recieving an audio signal in Auto On mode.  
Power Indicator LED  
The three position swith turns the AC supply On or Off and also  
sets the Subwoofers' AUTO ON feature. This feature is for your  
convience. When the subwoofer is set in the Auto-On mode it is  
not nessary to power your subwoofer completely off when not in  
use. In AUTO ON, the subwoofer stands by until it detects an  
audio signal input, then the Subwoofer turns on automatically. A  
few minutes after audio input signals cease, the Subwoofer  
automatically returns to standby mode and the LED returns to  
RED. The subwoofer has been designed in a way that you can  
leave the Auto-On feature active without causing any harm to  
your subwoofer.  
Power Switch  
This fuse protects against minor internal and external faults. The  
fuse value is indicated on the rear amplifier plate near the fuse  
itself. If the POWER switch is ON and the power indicator LED is  
unlit, unplug the power cord from the AC outlet and check the  
fuse by unscrewing the center piece from the holder. IMPOR-  
TANT: If the fuse malfunctions, replace it with another fuse of the  
same type, value and current rating. This information can be  
found on the fuse.  
Fuse  
Option 1. These terminals are for making connections using  
speaker wire.  
Speaker-In Terminals  
Option 2. LINE IN Jacks This jack is for input connection using  
an audio cable. (see options 1 & 2 on the following page)  
This feature adjusts the frequency limit for low audio signals  
from 50 Hz to 150 Hz. This control helps you adjust the system's  
low frequency balance to blend your subwoofer with the other  
speakers within your system. An example: If you adjust the control  
to the subwoofers low 50 Hz setting, the filter limits frequencies  
above that from being reproduced or heard from the subwoofer.  
Low Pass Frequency  
(Crossover) Control  
4
SUBWOOFER SERIES INSTALLATION  
Connecting Speakers  
This can be a desired setting if you are using the sub in combina-  
tion with tower or floor-standing speakers. If you are using satellites  
speakers with 5.25" cones sizes or under, you will want to move the  
frequency up to slightly overlap the lowest frequency the satellites  
can produce. If your satellite frequency response is rated at 80 Hz to  
18 kHz then you may choose to move the Crossover control higher  
to blend the highest frequency of the subwoofer slightly past the  
lowest frequency of the satellites. In this example you may wish to  
set your sub's Crossover control to 90 Hz creating a mid bass cou-  
pling between your sub and the rest of your speaker system.  
Low Pass Frequency  
(Crossover) Control  
(cont’d)  
Balances the loudness of the Subwoofer relative to the Front  
speakers and compensates for room effects on the Subwoofer’s  
output. It should not be necessary to set the level control to maxi-  
mum volume to achieve a well balanced installation, but you may  
need to adjust when changing between music CD's and DVDs.  
Level Control  
Important: Use Option1 or Option 2, but not both.  
OPTION 1. Connection with speaker wire - Connect speaker wires  
from the Receiver’s front left and right speaker outputs to the  
Subwoofer’s Speaker Level-In connections. Connect left channel to  
left input and right channel to right input. You have the option of  
connecting your main speakers to the speaker B outputs on your  
receiver if it is so equipped; otherwise, you have the option of con-  
necting your main speakers using the connections on the  
Subwoofer. This will send the audio signal to the main speakers  
while funneling the low bass frequencies to the subwoofer. To take  
advantage of this option, connect your main speakers to the right  
and left outputs on the Subwoofer. Be sure you take care to main-  
tain proper signal polarity by connecting the red wire to the red  
terminal, and black wire to the black terminal.  
Note: Dual recommends you  
use 16-gauge speaker wire for  
Opinion 1 when hooking your  
Receiver speaker outputs in  
making an audio connection to  
your Subwoofer.  
OPTION 2. Connection with audio cable - Connection with audio  
cable - This connection employs a left/right audio cable. To use this  
option, your receiver should include a subwoofer Out jack, which is  
typical of receivers equipped with Dolby Digital and DTS 5.1 decoding.  
Locate the subwoofer output jack on the back of your receiver.Using a  
standard audio cable, connect the subwoofer output on the back of  
your receiver to the line-In on the back of the subwoofer.  
5
SUBWOOFER SERIES TROUBLESHOOTING  
Troubleshooting  
If you believe you hear obvious distortion or knocking  
Distortion/Knocking  
sounds, immediately lower the volume level of your receiv-  
er. Those sounds often indicate that either the receiver or  
the subwoofer is being over driven and damage can result  
in playing CD's and DVD's at high volumes.  
You should avoid turning the bass or treble to maximum  
levels, and refrain from using the Loudness button when  
the volume level is high. This can lead to costly loudspeaker  
failure. Distorted or unnatural sound can also indicate poor  
connections. Check the connections. If the sound remains  
poor or distorted, the subwoofer may have a problem.  
Please call Dual service number for assistance.  
6
SUBWOOFER SERIES SPECIFICATIONS  
Specifications  
L6SW FEATURES  
• Gain control for volume adjustment  
• High level inputs  
• Low Level Inputs  
• Sleep mode feature integrated into the power switch for  
signal sensing Off/Auto/On  
•Led Indicator  
SPECIFICATIONS  
Woofer: 6.5" PVA treated rigid cone with ridge-edge  
surround for faster driver action  
Crossover: Internal cross over  
Amplifier: Class A/B amplifier - 100 Watts Peak Power/  
50 Watts RMS @ 10%  
Frequency Response: 50 Hz +/-3dB  
Dimensions H/W/D: 10.5”x 8.65” x 8.65”  
Weight: 10 lbs.  
Cabinet Design: Active Vented (2.25” Port) Enclosure of  
Acoustically Neutral MDF finished in ”Black Pica” Vinyl  
L8SW FEATURES  
• Gain control for volume adjustment  
• High level inputs  
• Low Level Inputs and Outputs  
• Adjustable low pass 50 Hz to 150 Hz  
• Sleep mode feature integrated into the power switch for  
signal sensing Off/Auto/On  
• Led Indicator  
SPECIFICATIONS  
Woofer: 8" Polypropylene cone with rubber surround.  
Crossover: Internal cross over  
Amplifier: Class A/B amplifier - 120 Watts Peak Power/  
60 Watts RMS @ 5%  
Frequency Response: 40 Hz +/-3dB  
Dimensions H/W/D: 15.75”x 10.85” x 14.95”  
Weight: 23 lbs.  
Cabinet Design: Active Vented (2” Port) Enclosure of Acoustically  
Neutral MDF finished in ”Black Pica” Vinyl.  
* Power handling is based on amplifier volume never being set above the  
point of audible distortion.  
All Rights Reserved. All specifications subject to change without notice.  
7
Limited Warranty  
This warranty gives you specific legal rights. You  
may also have other rights which vary from  
state to state.  
not covered: installation/ removal costs, dam-  
age resulting from accident, misuse, abuse,  
neglect, product modification, improper installa-  
tion, incorrect line voltage, unauthorized repair  
or failure to follow instructions supplied with  
the product, or damage occurring during return  
shipment of the product.  
Namsung America Inc. warrants this product to  
the original purchaser to be free from defects in  
material and workmanship, under normal con-  
ditions, for a period of five years for loudspeak-  
ers and one year for electronics and subwoofer  
amplifiers from the date of the original pur-  
chase. Namsung America agrees, at our option,  
during the warranty period, to repair any defect  
in material or workmanship or to furnish an  
equal new or renewed product in exchange  
without charges, subject to verification of the  
defect or malfunction and proof of the date  
of purchase.  
What to do?  
If the product requires warranty service, you  
must prepay the initial shipping charges. DUAL  
will pay the return shipping  
charges if the product is returned to an address  
within the USA.  
Namsung America Inc.  
Attn: Returns Center  
21318 64th Ave. South  
Kent, WA 98032 U.S.A.  
Toll Free: 1-866-626-7863  
During the Warranty Period  
During the Warranty Period From the date of  
purchase and through your stated warranty  
period, your product will be replaced with a  
new, renewed or comparable product (whichev-  
er is deemed necessary) if it becomes defective  
or inoperative. This is done without charge to  
you. Replacement products are warranted for  
the balance of the original warranty period.  
Exclusion of Certain Damages  
This warranty is exclusive and in lieu of any and  
all other warranties, expressed or implied,  
including without limitation the implied war-  
ranties of merchantability and fitness for a par-  
ticular purpose and any obligation, liability,  
right, claim or remedy in contract or tort,  
whether or not arising from the company’s neg-  
ligence, actual or imputed. No person or repre-  
sentative is authorized to assume for the com-  
pany any other liability in connection with the  
sale of this product. In no event shall the com-  
pany be liable for indirect, incidental or conse-  
quential damages.  
Who is covered?  
This warranty is extended to the original retail  
purchaser for products purchased and used in  
the U.S.A., in the 48 contiguous states ONLY.  
What is covered?  
This warranty covers all defects in material and  
workmanship in this product. The following are  
Namsung America Inc.  
21318 64th Ave. South  
Kent, WA 98032 U.S.A.  
Toll Free: 1-866-626-7863  
©2003 Namsung America, Inc.  
EVOK0703-V01  

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