Car Subwoofers
db840
8-inch single voice coil 4 Ohm subwoofer
8" woofer
20.32cm woofer
$7995each
db840
If you’re new to the thumpin’ world of big bad bass, you won’t find a better introduction than the db840, It’s a compact 8-inch subwoofer that really packs a punch. Keepin’ your install simple is good, too. So the db840 single voice coil is ideal when install space is limited. But you can also wire up several for the impact of multiple chassis shakin’ bass..
Incredible Sound, Affordable Price
It’s all here. All the Polk goodness and technology that makes our subwoofers a kickin’ addition to any vehicle’s audio system, as only Polk can deliver.
db840 Features:
“Dished” polypropylene cone supported by a vented cone/coil coupler stiffens the cone for greater mechanical stability and lower distortion.
Marine Certified Polk db Series speakers are built tough to withstand the toughest environments so they are perfect for use in boats of all types. That’s why Correct Craft offers Polk speakers in their award-winning Nautiques ski and wakeboarding boats.
Santoprene surround is impervious to extremes in temperature, humidity and exposure to sunlight for excellent long term reliability.
Fire-retardant flat NOMEX® spider allows extended linear motion while providing highly reliable mechanical and thermal stability.
Triple venting of the 4-layer Kapton voice coil former, cone/coil coupler and pole piece contribute to the high power handling and reliability of the db Series subs.
As with all Polk subwoofers, the voice coil alignment, motor and suspension were optimized using a state-of-the-art Klippel laser analyzer. The result is superior cone travel linearity for flatter response and lower distortion.
Dual voice coil version also available - db840DVC
Optional db8G grille is available.
All Polk products are made using the best materials and the most advanced manufacturing techniques. They pass the industry’s most exhaustive quality tests, including drop testing, extreme signal response and UV & salt exposure testing. Polk loudspeakers are built to perform for a lifetime.
Driver Complement | |
|---|---|
| Subwoofer | |
| Quantity | 1 |
| Diameter | 8" (20.32cm) |
| Type | Dynamic Balance woofer polymer composite cone |
Electrical | |
|---|---|
| Total Frequency Response | 30-200 Hz |
| Nominal Impedance | 4 ohms |
| Efficiency | 85 dB |
| Power Handling | |
| Continuous | 180 watts |
| Peak | 360 watts |
| Voice Coil | |
| Driver Diameter | 1 1/2" (3.81cm) |
Thiele / Small Parameters | |
|---|---|
| Resonant Frequency | 49 Hz |
| Xmax | |
| Xmax Linear | .51 inch/13 mm (peak to peak) |
| MMS | 67g |
| BL | 10.3 Tesla Meters |
| CMS | 157.6 Micro Meters |
| Recommended Enclosure | Sealed/Ported/Bandpass |
| SD | 35.65 sq inch/ 230 sq cm |
| VAS | .42 cubic feet/11.9 L |
| QTS | .6 |
| QES | .6 |
| QMS | 14.1 |
Dimensions | |
|---|---|
| Cut-Out Diameter | 7 1/8" (18.10cm) |
| Driver Mounting Depth | |
| Top Mount | 4 1/16" (10.32cm) |
| Bottom Mount | 4 1/2" (11.43cm) |
Shipping | |
|---|---|
| Unit of Measure | each |
Warranty | |
|---|---|
| Speaker Warranty | 1 year parts and labor (original purchaser) |
Specifications, dimensions and features subject to change without notice. For more information call us at 1-800-377-7655 (USA and Canada). Outside of North America call +1 (410) 358-3600.
Customer Reviews
1 reviews with an average of 5
Write your own reviewby Mark, August 2, 2008
105 out of 195 people found this review helpful.Strengths:
Very tight, big sound
Weaknesses:
No terminal connectors
Review:
For how small this thing is it puts out some very strong, clean sound. Don't spend $200 on a subwoofer unless you have money falling out of your pockets. I paid $70 for this one after that you're just buying prestige. One little bit of advice. If your putting this in a sealed enclosure, you'll need at least 185 RMS this thing is rated at. I'm using 200 RMS and that seems just about right.
db840 Media
db840 Literature
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Frequently Asked Questions
- What does Marine Certified mean?
- How do I wire my amp to a sub?
- Why isn’t my subwoofer loud enough?
- Where can I safely install my amp for best performance?
- What size wire should I use?
- How do I safely route my wires from the front of my car to the back?
- How do I build a box for a sub?
- How long is the warranty on Polk loudspeakers?