Specials Outlet
Polk Audio db840 db Series 8" 4-ohm subwoofer

1984 Tercel [remove]

Please measure mounting area to confirm fit
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5 out of 5
5 out of 5
A different use for the sub
Written By Paul, The Colony, TX on Wednesday, December 09, 2009

Unlike most everyone else who will buy this subwoofer, I used mine to upgrade the sub in my LSi15 home speakers. It's an easy upgrade that smooths and deepens the bass output of the 15's. I now feel as though there is enough bass for music without using a seperate powered sub.
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5 out of 5
5 out of 5
Polk Audio db840
Written By , Don Bedminster, Pa on Sunday, September 13, 2009

I have a bone stock 1995 300ZX 2+2 and wanted to keep the interior that way. I had to "hide" a subwoofer and I had been looking around for something that would fit the limited space I had to work with. I thought for certain that by going with an 8" sub, I'd be compromising the quality but I was ever wrong!. This sub fit perfectly in the small area behind the rear hatch panels and sounds incredible. I would recomend this product to anyone looking for quality sound-regardless of the space they have to work with.
Don
Bedminster, Pa
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5 out of 5
5 out of 5
Very good "musical" bass
Written By Chris, Boston, MA on Tuesday, June 09, 2009

Installed this sub into a custom made enclosure built in the center console of a Jeep Wrangler. At 8" it adds nice musical low-end, no thumping heard from a mile away but that is what I wanted. I am feeding with a 200W Rockford Fosgate amp and it seems to really appreciate the power since the sensitivity is pretty low. The enclosure is a little over .3 cu ft but stuffed so virtually close to the recommended .35 cu ft and sounds great. Perfect sub for adding musical low-end to a vehicle.
3 out of 3 people found this helpful
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5 out of 5
5 out of 5
Polk Audio db840
Written By Bret, Valrico, FL on Tuesday, April 07, 2009

Great sub woofers. I have them in 2007 Ford F150 Supercrew. I found a great center console to mount them in and it sits in the center of the back seat.

Great service from Crutchfield.
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5 out of 5
5 out of 5
Polk Audio db840
Written By GranburyRob, Granbury, Texas on Tuesday, March 03, 2009

Very good. I mounted these bad boys in old enclosure, put behind the back seat in my daughters' 73 vw convertible and these things really move some air. I have a Kicker amp in bridge mode supplying the power and it seems to really work well. - Rob
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1-5 of 7 items
No Interest If Paid Within 6 Months*

* Valid on qualifying purchases made between 12/29/09 – 3/31/10 when you use your Sony Financial Services credit card account.
On promo purchase balance, monthly payments required, and no finance charges will be assessed if:
(1) promo purchase balance paid in full in 6 months.
(2) all minimum monthly payments on account paid when due, and
(3) account balance does not exceed credit limit.
Otherwise, promo may be terminated & finance charges assessed from purchase date.

On promotions requiring a minimum payment, payments over the minimum will usually be applied to those promo balances before non-promo and other balances. If you have a non-promo balance, this may reduce the benefit from the promo. If you want to change this payment allocation, please call Customer Service. Standard terms apply to non-promo purchases and optional charges. Promo purchases on existing accounts may not receive full benefit of promo terms, including reduced APR if applicable, if account is subject to delinquency pricing. As of 12/01/09 APR 23.99% and on all accounts in default 29.99%. Minimum Finance Charge $2.00. Subject to approval by GE Money Bank.

Offer subject to termination at any time without prior notice.

Polk Audio db840

db Series 8" 4-ohm subwoofer

Item #107DB840
IN STOCK

Also Available In

Open Box
$71.99

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What's in the box?

Download owner's manual

  • One 8" woofer
  • 1 Rubber gasket (installed)
  • 8 Mounting screws
  • Manual (English/Spanish/French)
  • Online registration sheet