db Subwoofer Manual

db Subwoofer Manual
ATTACH YOUR RECEIPT
HERE AND FILE FOR
FUTURE REFERENCE
X
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Contact Polk Customer Service: 800-377-7655 polkcs@polkaudio.com
BRING ON THE NOIZE!
Please inspect each loudspeaker carefully. Notify your Polk Audio dealer if you notice any damage
or missing items. Keep the carton and packing material. They will do the best job of protecting your
speakers if they need to be transported.
BUILDING A HOME FOR YOUR SUBWOOFER—DB SUB ENCLOSURE 101
To get the best performance from your db Subwoofers, you must use a Subwoofer Enclosure. Don’t
bother using them in “free air,” with no sub box, just popped into the back deck of your car. You will
not get very good performance from your subwoofers if you do this.
You can build your own box, buy a pre-built box or a box kit, or have your Polk Audio dealer design
and build a custom sub enclosure for you. Your db Subwoofers were designed to work well in a wide
variety of enclosure sizes and configurations.
For more information about enclosures
and configurations, log on to
http://www.polkaudio.com/car/toolbox/subboxplans/
or call Polk Audio’s Customer Service Department
for a FAXback Sub Enclosure info sheet.
☞
☞
If you choose to build your own enclosure, be sure to build it well. Make certain it’s properly sealed
and airtight for maximum bass performance.
Polk Audio Customer Service is available from 9am–6pm, EST, Monday through
Friday, at 800-377-7655 (US & Can only, outside the US please call 410-358-3600)
or email us at polkcs@polkaudio.com. Please do not hesitate to call us if you
have questions about your speaker system. We love this stuff.
RECOMMENDED SEALED ENCLOSURES
db804 & 804DVC .35cu ft3 (9.9L)
db104 & 104DVC .66cu ft3 (18.7L)
db124 & 124DVC .88cu ft3 (24.9L)
For more info and accessories, visit www.polkaudio.com
3
WIRING DIAGRAMS FOR DB804, DB104,
DB124 (Single Voice Coil Hookup)
Please make certain that your amplifier is rated to carry the specified load.
+
+
+
-
-
AMP
-
+
AMP
-
+
With speakers wired in parallel:
Two 4Ω speakers will present a 2Ω load.
DUAL VOICE COIL WIRING DIAGRAMS FOR DB804DVC,
DB104DVC, & DB124DVC
Please make certain that your amplifier is rated to carry the specified load.
+
+
+
-
-
-
AMP
With coils in parallel, a dual 4Ω speaker
will present a 2Ω load.
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+
+
-
-
-
+
AMP
With coils wired in series, a dual 4Ω
speaker will present an 8Ω load.
Contact Polk Customer Service: 800-377-7655 polkcs@polkaudio.com
DUAL VOICE COIL WIRING DIAGRAMS FOR DB804DVC,
DB104DVC, & DB124DVC
+
AMP
-
+
+
-
-
+
+
-
-
+
+
-
-
+
AMP
-
+
+
-
-
With coils and speakers wired in parallel,
2 dual 4Ω speakers will present a 1Ω load.
(Not recommendedd unless amplifier is
rated for 1Ω operation.)
With the coils wired in series and the
speakers wired in parallel, 2 dual 4Ω
speakers will present a 4Ω load.
+
-
-
+
+
+
-
-
-
+
+
-
-
+
AMP
With the coils wired in series and the
speakers wired in parallel, 3 dual 4Ω
speakers will present a 2.7Ω load.
For more info and accessories, visit www.polkaudio.com
5
BREAK IT IN.
db Subwoofers will achieve even greater performance once they are thoroughly broken-in.
To break in your new db Subs, play 20 to 30 hours of music at moderate levels.
GET MORE INFORMATION ONLINE AT POLK UNIVERSITY:
http://www.polkaudio.com/car/faqad/index.php
AMPLIFIER POWER REQUIREMENTS FOR DB SUBWOOFERS
Your Subwoofers will work well with a variety of electronic components. As little as 50 watts per channel
will deliver adequate listening levels in most cars. If you have a noisy car or intend to play your system
at loud listening levels, more power is necessary to achieve the best performance. More power is always
better. Consult your Polk Audio dealer for specific recommendations.
OPTIMAL CROSSOVER SETTING
We recommend using an active crossover with a 12 to 18dB per octave low pass filter slope, and
setting it to an initial setting of 80 to 90Hz as a good starting point. This is an optimal crossover
setting on most vehicles.
INVERTING PHASE
Depending on the placement of your subwoofer enclosure and associated components, it may be
necessary to invert the phase of one or another of your system’s connections in order to gain better
subwoofer/mid-range blending. Inverting the phase simply means switching the positive connections
with the negative connections at the amplifier. If you choose to do this, invert the phase of only one
set of speakers (either your mains, or your subs, never both).
SAFE LIMITS OF OPERATION
Your Polk db Subwoofers are made with the highest quality materials for years of trouble-free
performance. However, damage to loudspeakers can occur when an amplifier, regardless of its
wattage, is made to play at higher listening levels than its power can clearly produce (usually
beyond the “1 to 2 o’clock” position on the volume control). This results in very high levels of
audible distortion, originating in the amplifier, which adds a harsh, gritty sound to the music.
Contrary to popular belief, a speaker is more likely to be damaged by trying to get too much
volume from a low-powered amp than from a high-powered one. Hear distortion? Turn it down.
Contact Polk Customer Service 800-377-7655 (9am–6pm, EST, Monday through Friday).
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Contact Polk Customer Service: 800-377-7655 polkcs@polkaudio.com
LOW FREQUENCY CUT-OFF FOR MID-RANGE SPEAKERS
IN SYSTEMS WITH SUBWOOFERS
Now that you have a subwoofer in your system, you may want to decrease the amount of bass
going to your mid-range speakers. This will get you better mid-range sound and increase the power
handling. There are two ways to roll off the bass before it gets to your mid-range speakers. One way is
to use a “bass blocker,” a capacitor placed in series with the speaker input. Bass blockers are installed
in series, one end connected with the positive lead from your amplifier and the other end connected
to the positive lead of each of your speakers. Bass blocker capacitors (200 microfarad @ 100volts,
non-polarized) are available at any RadioShack or parts supply house. The other route is to use
an electronic crossover device that allows filtering below 100Hz or so. Find these devices at your
authorized Polk Audio dealer.
+
Bass blocker
or capacitor
+
Radio/Amp
Speaker
–
–
TECHNICAL ASSISTANCE OR SERVICE
If, after following these hookup and installation directions, you experience difficulty, please
double-check all wire connections.
Make certain your electronic equipment is operating correctly by hooking up another speaker to the
speaker output. For example, if you are not getting sound from the left channel speaker, connect the
right channel speaker to the left output. If you still get no sound from that side, the problem is in your
amp or source electronics. Should you isolate the problem to the speaker, contact the authorized Polk
Audio dealer where you bought your speakers. Authorized Polk Audio dealers are the best source for
advice and assistance.
Polk Audio’s Customer Service Department is available from 9am–6pm, EST, Monday through Friday,
at 800-377-7655 (US & Can only, outside the US call 410-358-3600). Please do not hesitate to call us if
you have questions about your speaker system.
You will find additional information, informative articles, manual updates and cool
stuff to buy that has “Polk Audio” all over it by visiting www.polkaudio.com.
For more info and accessories, visit www.polkaudio.com
7
SUBWOOFER SPECIFICATIONS
db804
db104
db124
Thiele/Small Parameters
Type
subwoofer
subwoofer
subwoofer
Driver Complement
8”
10”
12”
Nominal Impedance
4Ω
4Ω
4Ω
Frequency Response
30-200Hz
28-200Hz
27-200Hz
Fs (Hz)
47Hz
37Hz
31Hz
Re
3.25Ω
3.25Ω
3.25Ω
Le
1.11mH
1.85mH
1.80mH
Qms
7.5
7.0
6.1
Qes
0.67
0.62
0.47
Qts
0.61
0.57
0.44
Vas
0.42ft3
(11.95L)
0.85ft3
(24.0L)
2.22ft3
(62.78L)
SD
35.65in2
(230cm2)
54.25in2
(350cm2)
80.6in2
(520cm2)
Power Handling (watts continuous)
180watts
270watts
360watts
Power Handling (watts peak)
360watts
540watts
720watts
Sensitivity (SPL at 1 watt / 1 meter)
85dB
86dB
88dB
Xmax (Linear)
0.24"
(6.1mm)
0.3"
(7.5mm)
0.3"
(7.5mm)
Voicecoil Diameter
1.5"
(38.1mm)
2.0"
(50.8mm)
2.0"
(50.8mm)
Mounting Depth Top Mount
4"
(100mm)
5 1/2"
(138.9mm)
6"
(152.4mm)
Mounting Depth Bottom Mount
4 9/16"
(115.8mm)
6 1/4"
(158.2mm)
6 3/4"
(171.4mm)
Mounting Diameter
7 1/16"
(179.4mm)
9 1/16"
(230.2mm)
11"
(279.4mm)
8
Contact Polk Customer Service: 800-377-7655 polkcs@polkaudio.com
SUBWOOFER SPECIFICATIONS
db804DVC
db104DVC
db124DVC
Thiele/Small Parameters
Type
subwoofer
subwoofer
subwoofer
Driver Complement
8”
10”
12”
Nominal Impedance
dual 4Ω
dual 4Ω
dual 4Ω
Frequency Response
30-200Hz
28-200Hz
27-200Hz
Fs (Hz)
47Hz
37Hz
32Hz
Re
3.25 Ω/coil
3.25 Ω/coil
3.25 Ω/coil
Le
2.47mH
2.75mH
2.75mH
Qms
12.11
6.07
5.60
Qes
0.64
0.57
0.55
Qts
0.61
0.52
0.50
Vas
0.45ft3
12.68L
0.85ft3
24.0L
2.22ft3
62.78L
SD
35.65in2
(230cm2)
54.25in2
(350cm2)
80.6in2
(520cm2)
Power Handling (watts continuous)
180watts
270watts
360watts
Power Handling (watts peak)
360watts
540watts
720watts
Sensitivity (SPL at 1 watt / 1 meter)
85dB/series
86dB/series
88dB/series
Xmax (Linear)
0.24"
(6.1mm)
0.35"
(9.0mm)
0.35"
(9.0mm)
Voicecoil Diameter
1.5"
(38.1mm)
2.0"
(50.8mm)
2.0"
(50.8mm)
Mounting Depth Top Mount
4"
(100mm)
5 1/2"
(138.9mm)
6"
(152.4mm)
Mounting Depth Bottom Mount
4 9/16"
(115.8mm)
6 1/4"
(158.2mm)
6 3/4"
(171.4mm)
Mounting Diameter
7 1/16"
(179.4mm)
9 1/16"
(230.2mm)
11"
(279.4mm)
For more info and accessories, visit www.polkaudio.com
9
10
Contact Polk Customer Service: 800-377-7655 polkcs@polkaudio.com
1 YEAR WARRANTY
Polk Audio, Inc. warrants the original purchaser only that this Polk Audio db Subwoofers Product
(the Product) will be free from defects in materials and workmanship for a period of (1) one year
from the date of original retail purchase from a Polk Audio Authorized Dealer. However, this warranty
will automatically terminate prior to the expiration of the (1) one year period if the original retail
purchaser sells or otherwise transfers the Product to any other party. The original retail purchaser
shall herein after be referred to as “you.” To allow Polk Audio to offer the best possible warranty service,
please fill out the Product Registration Card(s) and send them to the Factory at the address provided
in the Registration Card within (10) ten days of the date of purchase.
Defective Products must be shipped, together with a proof of purchase, prepaid insured to the
Authorized Polk Audio Dealer from whom you purchased the Product, or to 2550 Brittania Blvd.,
Suite A, San Diego, CA 92154. Products must be shipped in the original shipping container or its
equivalent; in any case the risk of loss or damage in transit is to be borne by you. If, upon examination
at the Factory or Polk Audio Authorized Dealer it is determined that the unit was defective in materials
or workmanship at any time during the Warranty period, Polk Audio or the Polk Audio Dealer will, at
its option, repair or replace this Product at no additional charge, except as set forth below. All replaced
parts and Products become property of Polk Audio. Products replaced or repaired under this Warranty
will be returned to you, within a reasonable time, freight prepaid.
This Warranty does not include service or parts to repair damage caused by accident, disaster, misuse,
abuse, negligence, inadequate packing or shipping procedures, commercial use, voltage inputs in
excess of the rated maximum of the unit, cosmetic appearance of the cabinetry not directly attributable
to defects in materials or workmanship, or service, repair, or modifications of the Product which has
not been authorized or approved by Polk Audio.
This Warranty is in lieu of all other expressed Warranties. If this Product is defective in materials and
workmanship as warranted above, your sole remedy shall be repair or replacement as provided above.
In no event will Polk Audio, Inc. be liable to you for any incidental or consequential damages arising
out of the use or inability to use the Product, even if Polk Audio, Inc. or a Polk Audio Dealer has been
advised of the possibility of such damages, or any other claim by any other party. Some states do not
allow the exclusion or limitation of consequential damages, so the above limitation and exclusion
may not apply to you. This Warranty gives you specific legal rights which may vary from state to state.
This warranty applies only to Products purchased in the United States of America, its possessions, and
U.S. and NATO armed forces exchanges and audio clubs. The Warranty terms and conditions applicable
to Products purchased in other countries are available from the Polk Audio Authorized Distributors in
such countries.
For more info and accessories, visit www.polkaudio.com
11
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