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  • Polk Audio db840 8-Inch Single Voice Coil Subwoofer (Single, Black)

  • Amazon

    From $47.32 (New)

  • MWave

    From $41.83 (New)

  • Best Buy

    From $68.99 (New)
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Buy from Amazon $56.58$28.00 $60.00 $48.33 $36.67 $25.00 Jul Oct Jan Apr Jul Oct Jan Apr Jul Oct Jan Apr Jul 2013 2014 2015 $53.15, Apr 23 - Apr 29$53.15, Apr 23 - Apr 29$44.55, Nov 17 9:26 pm$53.15, Apr 23 - Apr 29$45.18, Nov 23 - Nov 25$53.15, Apr 23 - Apr 29$45.45, Nov 29 - Dec 2$53.15, Apr 23 - Apr 29$45.25, Dec 4 - Dec 7$53.15, Apr 23 - Apr 29$45.45, Dec 10 - Dec 12$53.15, Apr 23 - Apr 29$45.25, Dec 14 - Dec 16$54.05, Dec 18 - Dec 24$53.15, Apr 23 - Apr 29$53.85, Dec 26 - Jan 7$53.15, Apr 23 - Apr 29$54.05, Jan 14 2:54 pm$53.15, Apr 23 - Apr 29$53.85, Jan 15 - Feb 4$53.15, Apr 23 - Apr 29$53.15, Apr 23 - Apr 29$44.78, Feb 6 - Feb 7$53.15, Apr 23 - Apr 29$45.45, Feb 7 - Feb 9$53.15, Apr 23 - Apr 29$44.78, Feb 10 - Feb 12$53.15, Apr 23 - Apr 29$45.45, Feb 12 - Feb 18$53.24, Feb 19 - Feb 23$53.15, Apr 23 - Apr 29$54.48, Feb 24 2:48 am$53.15, Apr 23 - Apr 29$53.25, Feb 26 - Feb 27$53.15, Apr 23 - Apr 29$53.15, Apr 23 - Apr 29$53.04, Mar 1 - Mar 11$53.15, Apr 23 - Apr 29$45.14, Mar 13 10:30 am$53.15, Apr 23 - Apr 29$43.99, Mar 14 - Mar 15$53.15, Apr 23 - Apr 29$45.91, Mar 17 - Mar 20$53.15, Apr 23 - Apr 29$44.93, Mar 21 3:23 pm$53.15, Apr 23 - Apr 29$43.99, Mar 25 - Mar 27$53.15, Apr 23 - Apr 29$43.98, Mar 29 - Apr 8$53.15, Apr 23 - Apr 29$47.38, Apr 13 - Apr 14$53.15, Apr 23 - Apr 29$47.20, Apr 17 1:02 am$53.15, Apr 23 - Apr 29$47.30, Apr 19 6:56 am$53.15, Apr 23 - Apr 29$47.38, Apr 22 5:05 am$53.15, Apr 23 - Apr 29$47.30, Apr 25 3:52 am$53.15, Apr 23 - Apr 29$47.38, Apr 26 - Apr 27$53.15, Apr 23 - Apr 29$52.70, May 1 3:21 am$53.15, Apr 23 - Apr 29$47.38, May 4 1:16 am$44.04, May 3 - May 4$53.15, Apr 23 - Apr 29$47.58, May 7 2:23 am$42.25, May 5 - May 7$53.15, Apr 23 - Apr 29$49.10, May 9 9:55 pm$41.99, May 9 8:46 am$53.15, Apr 23 - Apr 29$50.00, May 11 - May 13$41.12, May 12 6:15 am$53.15, Apr 23 - Apr 29$50.00, May 11 - May 13$41.23, May 13 4:17 am$53.15, Apr 23 - Apr 29$50.88, May 18 3:24 pm$41.23, May 13 4:17 am$53.15, Apr 23 - Apr 29$52.58, May 21 1:35 pm$41.23, May 13 4:17 am$53.18, May 27 4:51 am$53.15, Apr 23 - Apr 29$41.23, May 13 4:17 am$53.48, May 29 4:43 pm$53.15, Apr 23 - Apr 29$41.23, May 13 4:17 am$53.15, Apr 23 - Apr 29$50.00, May 31 - Jun 2$41.23, May 13 4:17 am$53.15, Apr 23 - Apr 29$49.99, Jun 3 - Jun 9$41.23, May 13 4:17 am$53.15, Apr 23 - Apr 29$50.28, Jun 10 4:15 am$41.23, May 13 4:17 am$53.15, Apr 23 - Apr 29$51.18, Jun 12 - Jun 13$46.50, Jun 12 - Jun 13$53.15, Apr 23 - Apr 29$51.68, Jun 16 3:21 am$46.74, Jun 16 3:21 am$53.15, Apr 23 - Apr 29$48.78, Jun 19 4:20 am$45.13, Jun 19 4:20 am$53.15, Apr 23 - Apr 29$49.99, Jun 22 5:05 am$43.25, Jun 22 5:05 am$53.15, Apr 23 - Apr 29$48.40, Jun 24 11:48 am$44.27, Jun 24 11:48 am$53.15, Apr 23 - Apr 29$49.60, Jun 26 - Jun 30$43.79, Jun 27 3:42 pm$53.15, Apr 23 - Apr 29$49.60, Jun 26 - Jun 30$43.35, Jun 29 - Jun 30$53.15, Apr 23 - Apr 29$47.48, Jul 3 3:54 am$41.98, Jul 3 3:54 am$53.15, Apr 23 - Apr 29$45.54, Jul 4 - Jul 5$39.94, Jul 5 - Jul 6$53.15, Apr 23 - Apr 29$45.45, Jul 8 - Jul 9$38.96, Jul 9 - Jul 10$53.15, Apr 23 - Apr 29$50.79, Jul 11 7:29 pm$45.70, Jul 11 7:29 pm$53.15, Apr 23 - Apr 29$50.79, Jul 14 10:46 am$45.83, Jul 14 - Jul 15$53.15, Apr 23 - Apr 29$50.68, Jul 15 - Jul 18$43.22, Jul 17 3:50 am$53.15, Apr 23 - Apr 29$49.99, Jul 20 - Jul 27$43.28, Jul 20 - Jul 22$53.15, Apr 23 - Apr 29$49.99, Jul 20 - Jul 27$46.28, Jul 23 6:59 pm$53.15, Apr 23 - Apr 29$49.99, Jul 29 5:00 am$46.31, Jul 26 - Jul 29$53.15, Apr 23 - Apr 29$52.39, Jul 31 7:38 pm$44.85, Jul 31 7:38 pm$53.15, Apr 23 - Apr 29$50.58, Aug 3 1:44 pm$44.40, Aug 3 1:44 pm$53.15, Apr 23 - Apr 29$50.40, Aug 7 - Aug 10$44.36, Aug 9 - Aug 11$53.15, Apr 23 - Apr 29$50.40, Aug 12 6:56 pm$44.35, Aug 12 6:56 pm$53.15, Apr 23 - Apr 29$50.40, Aug 15 9:46 pm$41.26, Aug 13 3:01 pm$53.15, Apr 23 - Apr 29$50.68, Aug 17 - Aug 19$41.26, Aug 13 3:01 pm$54.48, Aug 21 8:09 am$53.15, Apr 23 - Apr 29$41.26, Aug 13 3:01 pm$53.90, Aug 23 - Aug 24$53.15, Apr 23 - Apr 29$41.26, Aug 13 3:01 pm$53.98, Aug 25 - Aug 26$53.15, Apr 23 - Apr 29$41.26, Aug 13 3:01 pm$53.15, Apr 23 - Apr 29$49.99, Aug 27 - Sep 3$41.26, Aug 13 3:01 pm$53.15, Apr 23 - Apr 29$50.40, Sep 4 - Sep 8$41.26, Aug 13 3:01 pm$53.15, Apr 23 - Apr 29$49.99, Sep 10 6:42 pm$41.26, Aug 13 3:01 pm$50.45, Sep 13 - Sep 30$49.98, Sep 12 - Sep 13$41.26, Aug 13 3:01 pm$50.45, Sep 13 - Sep 30$47.32, Sep 14 - Sep 23$41.26, Aug 13 3:01 pm$50.45, Sep 13 - Sep 30$49.98, Sep 24 - Sep 30$41.26, Aug 13 3:01 pm$47.43, Oct 1 - Oct 8$46.99, Oct 1 11:55 pm$41.26, Aug 13 3:01 pm$47.32, Oct 11 - Oct 13$46.99, Oct 1 11:55 pm$43.13, Oct 11 - Oct 12$49.04, Oct 15 9:45 am$46.99, Oct 1 11:55 pm$44.26, Oct 15 9:45 am$47.32, Oct 16 - Oct 31$46.99, Oct 1 11:55 pm$41.31, Oct 17 3:52 pm$47.32, Oct 16 - Oct 31$46.99, Oct 1 11:55 pm$35.00, Oct 19 - Oct 21$47.32, Oct 16 - Oct 31$46.99, Oct 1 11:55 pm$28.00, Oct 22 - Jan 13$47.43, Nov 2 1:07 am$46.99, Oct 1 11:55 pm$28.00, Oct 22 - Jan 13$49.25, Nov 7 2:09 am$46.99, Oct 1 11:55 pm$28.00, Oct 22 - Jan 13$50.08, Nov 10 3:57 am$46.99, Oct 1 11:55 pm$28.00, Oct 22 - Jan 13$50.45, Nov 12 - Nov 15$46.99, Oct 1 11:55 pm$28.00, Oct 22 - Jan 13$50.45, Nov 12 - Nov 15$48.08, Nov 17 2:24 pm$28.00, Oct 22 - Jan 13$50.45, Nov 12 - Nov 15$46.98, Nov 21 11:38 am$28.00, Oct 22 - Jan 13$47.45, Nov 24 4:00 pm$46.98, Nov 23 2:32 pm$28.00, Oct 22 - Jan 13$49.73, Nov 27 11:31 am$48.08, Nov 25 6:45 pm$28.00, Oct 22 - Jan 13$49.08, Nov 28 11:39 am$48.94, Nov 29 11:43 am$28.00, Oct 22 - Jan 13$50.45, Dec 2 - Dec 5$49.08, Nov 28 11:39 am$28.00, Oct 22 - Jan 13$50.45, Dec 2 - Dec 5$50.20, Dec 8 3:09 pm$28.00, Oct 22 - Jan 13$50.45, Dec 2 - Dec 5$49.99, Dec 10 10:24 pm$28.00, Oct 22 - Jan 13$50.45, Dec 2 - Dec 5$50.20, Dec 14 12:02 am$28.00, Oct 22 - Jan 13$50.48, Dec 17 - Dec 18$50.45, Dec 2 - Dec 5$28.00, Oct 22 - Jan 13$50.45, Dec 2 - Dec 5$46.98, Dec 20 8:23 pm$28.00, Oct 22 - Jan 13$48.00, Dec 31 9:36 pm$47.32, Dec 29 - Dec 30$28.00, Oct 22 - Jan 13$49.00, Jan 2 5:50 am$28.00, Oct 22 - Jan 13$51.08, Jan 12 6:36 am$28.00, Oct 22 - Jan 13$52.98, Jan 15 3:43 am$44.66, Jan 14 - Jan 15$50.59, Jan 17 7:34 pm$45.12, Jan 17 - Jan 18$50.10, Jan 20 - Jan 24$43.52, Jan 20 - Jan 21$50.10, Jan 20 - Jan 24$43.57, Jan 22 - Jan 23$50.59, Jan 26 6:09 am$45.10, Jan 26 6:09 am$49.99, Jan 29 8:09 pm$45.15, Jan 29 8:09 pm$49.99, Feb 1 4:07 pm$45.28, Feb 1 4:07 pm$50.59, Feb 4 11:23 am$45.29, Feb 2 - Feb 5$50.59, Feb 6 6:59 pm$37.33, Feb 5 - Feb 9$50.10, Feb 9 1:35 pm$37.33, Feb 5 - Feb 9$49.69, Feb 12 8:47 am$37.31, Feb 10 - Feb 14$50.58, Feb 15 4:36 am$37.40, Feb 15 4:36 am$49.69, Feb 18 4:14 am$45.21, Feb 18 4:14 am$49.69, Feb 21 2:37 am$39.79, Feb 21 2:37 am$49.69, Feb 23 - Feb 24$45.34, Feb 24 - Feb 25$50.39, Feb 25 - Feb 28$45.33, Feb 26 11:03 pm$49.99, Mar 2 2:33 am$45.32, Mar 2 2:33 am$50.58, Mar 3 - Mar 4$45.31, Mar 3 - Mar 4$50.10, Mar 22 4:34 am$45.28, Mar 22 - Mar 28$49.69, Mar 24 2:45 pm$45.28, Mar 22 - Mar 28$49.99, Mar 28 3:30 am$45.28, Mar 22 - Mar 28$49.69, Mar 31 - Apr 1$45.27, Mar 29 - Mar 31$49.70, Apr 2 4:56 pm$42.92, Apr 2 4:56 pm$49.69, Apr 5 - Apr 6$39.59, Apr 5 10:22 am$49.69, Apr 8 8:59 pm$38.58, Apr 8 8:59 pm$49.79, Apr 10 - Apr 12$38.58, Apr 8 8:59 pm$49.70, Apr 13 10:41 pm$38.58, Apr 8 8:59 pm$49.79, Apr 16 5:49 pm$38.58, Apr 8 8:59 pm$49.69, Apr 19 9:50 am$38.58, Apr 8 8:59 pm$50.09, Apr 22 9:07 pm$38.58, Apr 8 8:59 pm$48.95, May 1 3:38 am$38.58, Apr 8 8:59 pm$48.99, May 13 - May 15$38.58, Apr 8 8:59 pm$49.79, May 19 12:03 am$38.58, Apr 8 8:59 pm$49.80, May 24 10:49 am$38.58, Apr 8 8:59 pm$49.79, May 26 2:23 pm$38.58, Apr 8 8:59 pm$49.99, May 28 8:09 pm$38.58, Apr 8 8:59 pm$49.90, Jun 2 12:28 pm$38.58, Apr 8 8:59 pm$48.95, Jun 4 8:46 pm$38.58, Apr 8 8:59 pm$49.69, Jun 7 - Jun 9$38.58, Apr 8 8:59 pm$49.79, Jun 11 - Jun 13$38.58, Apr 8 8:59 pm$49.69, Jun 16 9:21 am$38.58, Apr 8 8:59 pm$50.09, Jun 17 - Jun 18$38.58, Apr 8 8:59 pm$49.99, Jun 20 - Jun 24$38.58, Apr 8 8:59 pm$50.00, Jun 28 2:56 am$38.58, Apr 8 8:59 pm$48.95, Jun 30 - Jul 2$38.58, Apr 8 8:59 pm$49.99, Jul 4 - Jul 5$38.58, Apr 8 8:59 pm$48.95, Jul 12 - Jul 14$38.58, Apr 8 8:59 pm$49.69, Jul 16 - Jul 19$38.58, Apr 8 8:59 pm$48.95, Jul 21 - Jul 25$38.58, Apr 8 8:59 pm$49.99, Jul 27 - Aug 5$38.58, Apr 8 8:59 pm$55.19, Aug 7 2:00 am$38.58, Apr 8 8:59 pm$49.99, Aug 8 11:51 pm$38.58, Apr 8 8:59 pm$54.16, Aug 12 9:05 pm$38.58, Apr 8 8:59 pm$49.95, Aug 14 - Aug 16$38.58, Apr 8 8:59 pmOOS $49.99, Aug 18 2:16 pm$38.58, Apr 8 8:59 pm$49.90, Aug 20 - Aug 30$38.58, Apr 8 8:59 pm$49.99, Aug 31 - Sep 4$38.58, Apr 8 8:59 pm$52.95, Sep 6 - Sep 9$38.58, Apr 8 8:59 pm$45.48, Sep 11 - Sep 15$38.58, Apr 8 8:59 pm$52.95, Sep 17 - Sep 23$38.58, Apr 8 8:59 pmOOS $49.99, Sep 24 6:34 pm$38.58, Apr 8 8:59 pm$49.99, Sep 30 - Oct 6$38.58, Apr 8 8:59 pm$45.48, Oct 7 - Oct 9$38.58, Apr 8 8:59 pm$49.98, Oct 10 - Oct 20$38.58, Apr 8 8:59 pm$49.92, Oct 24 - Oct 29$38.58, Apr 8 8:59 pm$48.91, Nov 1 7:04 pm$38.58, Apr 8 8:59 pm$49.93, Nov 3 - Nov 4$38.58, Apr 8 8:59 pm$49.99, Nov 7 - Nov 19$38.58, Apr 8 8:59 pm$56.58, Nov 21 3:23 pm$38.58, Apr 8 8:59 pm$49.36, Nov 22 - Nov 26$38.58, Apr 8 8:59 pm$50.08, Dec 5 8:25 pm$38.58, Apr 8 8:59 pm$49.99, Dec 8 - Dec 13$42.49, Dec 8 - Dec 13$48.70, Dec 15 - Dec 16$41.40, Dec 15 - Dec 17$49.08, Dec 17 - Dec 20$41.40, Dec 20 8:30 am$48.69, Dec 21 - Dec 27$41.39, Dec 21 - Dec 27$45.09, Dec 29 11:46 am$36.51, Dec 29 11:46 am$48.69, Dec 31 - Jan 2$38.24, Dec 30 6:22 pm$48.70, Jan 3 12:01 pm$49.74, Jan 6 12:03 am$52.43, Jan 9 9:45 pm$51.72, Jan 11 8:52 pm$49.95, Jan 14 - Feb 22$49.99, Feb 24 - Feb 28$49.98, Mar 1 2:51 pm$49.69, Mar 3 - Mar 9$48.69, Mar 12 - Mar 19OOS $48.69, Mar 22 2:53 am$48.69, Mar 25 5:26 amOOS $48.69, Mar 28 5:34 am$48.69, Mar 31 5:39 am$49.95, Apr 3 - Apr 21 3,77249,302 62,500 41,667 20,833 Oct Dec Feb Apr Jun Aug Oct Dec Feb Apr Jun 2015 2016

Price Details

New

Last Seen $47.32 Dec 30, '14
Highest $53.15 Apr 23, '13
Lowest $47.32 Dec 29, '14
Average $52.47 (Overall average)
Added Apr 23, 2013

3rd Party New

Latest $49.95 2 days ago
Highest $56.58 Nov 21, '15
Lowest $42.95 Dec 28, '15
Average $49.53 (30d avg)
$49.63 (90d avg)
$49.69 (180d avg)
$49.72 (365d avg)
$49.50 (Lifetime average)
Added Apr 23, 2013

3rd Party Used

Last Seen $38.24 Dec 30, '15
Highest $49.64 Jun 13, '14
Lowest $28.00 Oct 22, '14
Average $41.48 (180d avg)
$41.48 (365d avg)
$38.98 (Lifetime average)
Added Apr 23, 2013

Sales Rank

30 day average: 26,443
90 day average: 19,783

Product Description

Polk Audio db840 8-Inch Single Voice Coil Subwoofer (Single, Black)

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Buy from MWave $42.27$41.83 $43.00 $41.00 May Jul Sep Nov Jan Mar May Jul 2014 2015 $42.27, Mar 27 - May 6$41.83, May 7 - Jun 24

Price Details

New

Last Seen $41.83 Jun 24, '15
Highest $42.27 Mar 27, '14
Lowest $41.83 May 7, '14
Average $41.83 (30d avg)
$41.83 (90d avg)
$41.83 (180d avg)
$41.83 (365d avg)
$41.87 (Lifetime average)
Added Mar 27, 2014

Product Description

P.A. DB840 - 8-inch Single Voice Coil 4-ohm Subwoofer Each - Manufacturer: P.A. - Mfg Part Number: DB840 - Condition: New - Packaging: Bare Drive

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Buy from Best Buy $79.99$68.99 $75.00 $70.00 $65.00 Sep Nov Jan Mar May Jul Sep Nov Jan Mar May 2015 2016 $79.99, Jul 4 - Jan 11$68.99, Jan 15 - Mar 13

Price Details

New

Last Seen $68.99 Mar 13, '16
Highest $79.99 Jul 4, '14
Lowest $68.99 Jan 15, '16
Average $68.99 (30d avg)
$72.87 (90d avg)
$76.43 (180d avg)
$78.23 (365d avg)
$78.95 (Lifetime average)
Added Jul 4, 2014

Product Description

Upgrade your car audio system with this Polk Audio DB840 subwoofer, which features a Santoprene surround that protects against extreme temperatures, humidity and sunlight exposure. The triple-vented design delivers high power handling.

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