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Polk Audio DB 842 SVC DB+ Series shallow-mount 8" 4-ohm subwoofer

Item # 107DB842S

Polk Audio's DB+ Series subwoofers combine high-tech materials and advanced design to give you smooth, powerful,...

Polk Audio's DB+ Series subwoofers combine high-tech materials and advanced design to give you smooth, powerful,...

9 questions - 21 answers

Item # 107DB842S

In stock
$89.00 each

About the Polk Audio DB 842 SVC

Bob Bihlmayer

Hard-hitting bass

Polk Audio's DB+ Series subwoofers combine high-tech materials and advanced design to give you smooth, powerful, hard-hitting bass without stressing your wallet. The DB 842 SVC 8" subwoofer boasts a rigid polypropylene cone and durable Santoprene™ surround built to handle big power over the long run. Its low-profile design means you get serious performance from a sub that takes up less space.

Hard-hitting bass

Polk Audio's DB+ Series subwoofers combine high-tech materials and advanced design to give you smooth, powerful, hard-hitting bass without stressing your wallet. The DB 842 SVC 8" subwoofer boasts a rigid polypropylene cone and durable Santoprene™ surround built to handle big power over the long run. Its low-profile design means you get serious performance from a sub that takes up less space.

Certified for marine use

Match a DB+ sub to a suitable enclosure, and enjoy impressive bass punch rarely found in this price range. Polk Audio tests this sub rigorously for environmental effects caused by sun, moisture, and extreme temperature changes. They even certify this sub for marine applications, so they're a great choice for your boat too.

Subwoofer Wiring Diagrams

To see sample wiring diagrams for all common subwoofer/amplifier combinations, check out this informative article.

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Product highlights:

  • 8" 4-ohm subwoofer
  • polypropylene cone with Santoprene rubber surround
  • marine-certified for use in boats and convertibles
  • handles up to 250 watts RMS
  • peak power handling: 750 watts
  • frequency response: 30-200 Hz
  • sensitivity: 84 dB
  • top-mount depth: 3-3/4"
  • sealed box volume: 0.5-1.2 cu. ft.
  • ported box volume: 0.66-1.2 cu. ft.
  • warranty: 1 year
  • MFR # AA9842-A

What's in the box:

  • One 8" subwoofer
  • 1 Foam gasket
  • Eight 1-3/8" Allen head stainless steel screws
  • Wiring diagram/ Specification sheet (English/ French/ Spanish/ German/ Italian)
  • Online registration information

Customer reviews for Polk Audio DB 842 SVC

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More details on the Polk Audio DB 842 SVC

Pat M.

Product Research

Features

Marine Certification: Polk DB+ series speakers are marine certified (IP56 rated), making them a good choice for boats in fresh water, convertibles, motorcycles, ATVs, and other applications where the speaker might get wet. Because they have coated steel baskets and the terminals are not covered, we do not recommend using them in salt water environments.

Dynamic Balance: Dynamic Balance is a proprietary Polk Audio technology using laser imaging to determine what combination of speaker materials create the least amount of resonance. Eliminating resonance in speakers results in a wide, smooth response and low distortion.

Sealed Box Volume: Polk recommends a sealed enclosure between 0.5 ft³ and 1.2 ft³.

Ported Box Volume: Polk recommends a ported enclosure between 0.66 ft³ and 1.2 ft³.

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Customer Q&A

9 questions already asked

Q
Will this work as a replacement for 2008 Honda Civic Si stock subwoofer?
boogie  Jan 08, 2024
1 answer
A
This Polk DB 842 subwoofer is not a fit in your 2008 Honda Civic, Boogie. Please use our online Vehicle Guide in the link below. Enter your exact vehicle specifications and we will list all subwoofers that are a physical fit. Replacing the low-impedance factory speaker with a 4-ohm aftermarket speaker will result in lower volume levels, keep in mind for best performance an amp would be needed. https://www.crutchfield.com/m_399/Car-Speakers.html
bo  Jan 08, 2024 (Staff)
Q
Will this work in a 2004 f150 with factory stock amp?
devin  Mar 28, 2022
3 answers
A
If the factory amp is pushing 150 watts or more and you plan to bridge it and dedicate all of it's power to this sub then it will sound great. Anything less than that though and you won't get the most out of your sub.
christopher  Mar 30, 2022
A
I bought this speaker for a 2008 Toyota Solara, so I'm not sure if it'll fit in a F-150. As far as working with the stock amp, I'm sure it would be fine.
david  Mar 28, 2022
A
its a shallow 8 inch marine grade sub. if it fits an 8 inch sub and has the proper power ratings, then yes.
michael  Mar 28, 2022
Q
Could I use this subwoofer in place of the stock sub in my 2001 yukon but keep the stock amp? I cannot find the specs anywhere. I know this sub can physically fit but am looking for a sub that can be used with stock amp power. Is there a better option?
peyton  Dec 19, 2021
2 answers
A
No the ohms are different and the factory output is very weak.
daniel  Dec 20, 2021
A
You will want to contact an Advisor by phone (1-800-324-9695) or online chat to discuss compatibility with your factory system. They will be able to pull up your vehicle and see if this will integrate. If it does not, then they will also be able to discuss other options with you.
kenneth  Dec 20, 2021 (Staff)
Q
What speaker grill will work for this?
kristian  Jun 18, 2020
2 answers
A
I didn't need one. I put it in the place of a previous subwoofer
ivery  Jun 19, 2020
A
crutchfield can help you with your question,i hooked mine up in my stick location in my tahoe...sorry i couldn't be more helpful to you and good luck on finding a grill for your sub
edward  Jun 18, 2020
Q
Is this a replacement sub for the 03 Lexus LS430?
waltham  Jun 04, 2019
2 answers
A
This would not be a great match for replacing your factory subwoofer in your lexus The OEM subwoofer has an impedance of 12-ohm, while this sub has an impedance of 4-ohm. This would burn up your amplifier. If you would like to discuss further you can contact an Advisor directly by phone (1-800-324-9695) or online chat.
thomas  Jun 12, 2019 (Staff)
A
I was asked by Crutchfield if i could help answer your question. I do not know if it will work with your Lexus. But i use 2 of these Polk woofers in a pair of old school Kicker SubStation tube boxes and i have to say they do sound good. Good power handling and tight bass. If you are looking for a nice decent affordable woofer i would recommend these. You would just have to check your fitment if they will work with your setup.
stephanie  Jun 04, 2019
Q
Can this subwoofer be mounted facing upward in the rear window deck?
gregory  Mar 25, 2019
3 answers
A
i'm pretty sure it can be,with the right cut out you should be fine
edward  Apr 01, 2019
A
Yes and I might add my Avalon had the factory sub mount in the rear window console. I'm overly pleased with this sub.
keith  Apr 01, 2019
A
Im not sure. I used it to replace the driver from a busted Monitor Audio sealed subwoofer.
nicholas  Apr 01, 2019
Q
What size hole does this sub require?
george  Nov 23, 2018
4 answers
A
If you are going with a pre-made box then any standard 8 inch setup will work. If you are custom making one then it will tell you the exact hole diameter in the paperwork that comes with it.
shawn  Dec 03, 2018
A
hello. I build custom motorcycles for a living. So for me i try to make as small a opening as i can.. use the card board that the speaking came sitting in when shipped. notice how close it fits to the speaker from the back. find the center of where you want to place it. Then center the card board trace around the inside. for me it always mounts in either plastic or fiber glass so sanding away if it to tight is easy.. better to be to small and cut away the to big.. if your putting into wood im sure car installers have better ways
brian  Dec 03, 2018
A
Hello There What size hole cutout for this speaker you ask. Well i did not actually cut out my own hole for these subs. I use a pre-existing tubes boxes i already had and just replaced the old subs in there with the Polk Subs . Kicker Substations from back in the old school days. The tubes were 8" already. But i have looked on the Polk Web site and it has the info there for what hole size needs to be cut out. Go to there web site on this sub and scroll down to the spec section and it shows there. It says 7.28" (18.49 cm) thanks
stephanie  Dec 03, 2018
A
There is a template in the box
peter  Dec 03, 2018
Q
Thinking of upgrading woofer on Roland Street EX guitar amplifier. It has two eight inch 4 ohm woofers with 25 dedicated watts each. Hoping to get a punchier bass by replacing one with the polk. What do you think?
norman  Jul 14, 2018
3 answers
A
It depends on what the factory amp will handle I believe those Polk subs are rated for 300 watts nominal. I would think that since the stock speakers were only made for a 25 watt system you would actually have a worse sound due to not enough power being supplied.
shawn  Jul 14, 2018
A
I am by no means an audio expert but I believe you will not achieve the desired effect by replacing your speaker. In order to increase bass output you will need increase your watts. This speaker requires much more than 25 watts to to function properly. I currently use this speaker bridged @ 100 watts dedicated for 80 hz and lower. It does provide adequate bass for a car audio application. Roland makes top shelf equipment so I doubt that any speaker replacement would increase bass output. What you could do is look into a powered sub woofer and use the line out jack. I think this is your best option. Good Luck !
william  Jul 14, 2018
A
I am really happy with the one I bought . It made a great difference in my application.
chad  Jul 14, 2018
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