3
2
PRODUCT SPECIFICATIONS
Introduction
Congratulations on your purchase of a DB Drive state-of-the-art subwoofer. Your selection of a
DB Drive car audio product indicates a true appreciation of fine musical reproduction. Whether
adding to an existing system or including your DB Drive subwoofer in a new system, you are
certain to notice immediate performance benefits.
Keep Your Sales Receipt
Take this time to attach your sales receipt to the manual and put in a safe place. In case of any
unforeseen reason this product may need warranty service, your receipt will be necessary to
establish purchase date.
Recommendation
A power subwoofer’s performance is only as good as its installation. Proper installation will max-
imize the system’s overall performance. It is recommended that you have our product installed
by an authorized DB Drive retailer. However, if you decide to install it yourself, please carefully
read through this manual and take your time to do a quality installation.
IMPORTANT!
Before making any connections, disconnect the car’s battery until the installation is
completed to avoid possible damage to the electrical system.
WARNING
!
Exposure to high power sound system can cause hearling loss or damange. Listening
to your system at loud levels while driving will impair your ability to hear traffic sounds
and emergency vehicles. Use common sense when listening to your system.
Serial #___ ___ ___ ___ ___ ___ ___ ___ ___ ___ _ ___ __
_
Model #___ ___ ___ ___ ___ ___ ___ ___ ___ _ _ ___ ___
EW7 12D2
EW7 12D4
EW7 15D4
Sensitivity 1W/1m)
SPL
86.402 dB
89 dB
87.93 dB
DC Resistance
Re
1.99 Ω x 2
3.20 Ω x 2
3.20 Ω x 2
Inductance
Le
1.128mH
1.272 mH
1.75 mH
Free Air Resonance
Fo
28.356 Hz
31.747 Hz
27.64 Hz
Equivalent Stiffeness
Vas
71.162 Ltr
68.802 Ltr
146.177 Ltr
Mechanical
Q
Qms
6.673
6.119
4.94
Electrical
Q Qes
0.572
0.498
0.765
Total
Q
Qts
0.527
0.46
0.663
Moving Mass
Mms
166.543 g
137.428 g
235.54 g
Motor Force
BL
14.389 TM
18.788 TM
18.56 TM
Cone Surface Area
Sd
51.472m sqM
51.472 mM
85.530 mM
Linear Excursion (1-way)
Xmax
10.5mm
11mm
11mm
Mechanical
Excursion
Xmech 28mm
28mm
28mm
Driver Displacement
Disp
0.126 cuft
0.126 cuft
0.216 cuft
TS Specs
EW7 8D4
EW7 10D2
EW7 10D4
Sensitivity 1W/1m)
SPL
84.31 dB
85.106 dB
86.48 dB
DC Resistance
Re
3.20 Ω x 2
2.00 Ω x 2
3.20 Ω x 2
Inductance
Le
1.113 mH
1.129mH
1.79 mH
Free Air Resonance
Fo
9.24 Hz
32.20 Hz
38.19 Hz
Equivalent Stiffeness
Vas
3.44 Ltr
31.805 Ltr
26.90 Ltr
Mechanical
Q
Qms
4.04
6.249
5.13
Electrical
Q Qes
0.903
0.504
0.51
Total
Q
Qts
0.738
0.467
0.47
Moving Mass
Mms
51.67 g
130.854 g
109.94 g
Motor Force
BL
10.96 TM
14.508 TM
18.02 TM
Cone Surface Area
Sd
21.64 mM
34.63m sqM
34.63 mM
Linear Excursion (1-way)
Xmax
7mm
10.5mm
11mm
Mechanical
Excursion
Xmech
19.5mm
28mm
28mm
Driver Displacement
Disp
0.044 cuft
0.086 cuft
0.086 cuft
