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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,...

Read more from Crutchfield writer, Bob B.

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$79.99 Sale: -$20.00 off

$59.99 each

About the Polk Audio DB 842 SVC

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.

To drive this single subwoofer, we recommend a mono amplifier rated between 185 and 375 watts RMS at 4 ohms. For more information, please refer to our article on How to Match Subwoofers and Amplifiers.

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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
  • Our 60-day money-back guarantee
  • MFR # AA9842-A
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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

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Polk Audio DB 842 SVC Reviews

Average Customer Review(s):

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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

Q
Crutchfield asked: Why did you buy this?
A
Price and read the comments. They seemed really good. The other buyers seemed pleased. [ TERESA  Jan 06, 2019 ]
A
Building custom boxes for my Wrangler and wanted to build one for a 10" sub and one for an 8" sub. [ Peter  Dec 27, 2018 ]
A
to replace my factory subwoofer and to find a subwoofer to match my jl audio amp [ Edward  Dec 22, 2018 ]
A
Replacement for OEM sub Lexus LS430 with Mark Levinson system [ Matt  May 29, 2018 ]
A
space requirements value and good reviews [ Tyler  Mar 16, 2018 ]
A
High quality replacement to a factory system. Shallow mount so it will tuck in nicely to the rear door. [ Shawn  Jan 13, 2018 ]
A
It was recommended to me over the phone by a Crutchfield advisor for these reasons, fitness, quality, and affordable price. I agreed with the advisor's recommendation and then placed my order. [ DONALD  Dec 22, 2017 ]
A
prior experience with polk products...and fit. [ doug  Dec 05, 2017 ]
A
because they are Polk. [ michael  Nov 23, 2017 ]
A
My boyfriend told me to order it [ JOY  Nov 03, 2017 ]
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2 questions already asked

Q
What size hole does this sub require?
[ Tacklebox  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?
[ MisterNL  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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