6-1/2" Poly Cone Midbass Woofer 4 Ohm

This buyout 6-1/2" woofer is the perfect replacement for worn, tired sealed bookshelf speakers. The extended frequency response allows it to mate well with tweeters without a low pass filter. Save nearly 60% off the original retail price through this Parts Express exclusive buyout.
  • Smooth, natural response doesn't require a low-pass filter
  • Decent Xmax for good bass response
  • Designed for use in sealed cabinets
  • Save nearly 60% off the original retail price!
Part # 
Weight: 1.8 lbs.  
List Price$14.99
Regular Price$26.00
You Save81%
Sale Price
Buy 25-79 $3.99
Buy 80-up$3.20
Part # 299-609
Qty:  EA
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Product Details

6-1/2" Poly Cone Midbass Woofer 4 Ohm

This durable 6-1/2" poly cone woofer with rubber surround is designed to work best in small, sealed bookshelf-style cabinets. The damped poly cone creates smooth sound from 45 Hz all the way up to 3,000 Hz and is easy to integrate with many different tweeters, and the 4 ohm impedance extracts more current from an amplifier for twice the output (3 dB increase), when compared to a similar 8 ohm speaker.

A 1" voice coil is combined with an aluminum former for a power handling rating of 30 watts RMS and 60 watts max, and the "Q" of the motor is such that solid bass performance can be achieved in cabinets as small as 0.25 cubic feet, with an f3 of 63 Hz (with a 1/4 pound of acoustic fill).

Save over 50% off the original price through this exclusive factory buyout. 

Product Specifications
  • Nominal Diameter6-1/2"
  • Power Handling (RMS)30 Watts
  • Power Handling (max)60 Watts
  • Impedance4 ohms
  • Frequency Response50 to 6,000 Hz
  • Sensitivity88.3 dB 2.83V/1m
  • Voice Coil Diameter1"
Thiele-Small Parameters
  • Resonant Frequency (Fs)52 Hz
  • DC Resistance (Re)3.37 ohms
  • Voice Coil Inductance (Le)0.48 mH
  • Mechanical Q (Qms)2.99
  • Electromagnetic Q (Qes)1.4
  • Total Q (Qts)0.95
  • Compliance Equivalent Volume (Vas)0.65 ft.³
  • Maximum Linear Excursion (Xmax)3.5 mm
Materials of Construction
  • Cone MaterialPoly
  • Surround MaterialRubber
  • Voice Coil Wire MaterialCopper
  • Voice Coil FormerAluminum
  • Basket / Frame MaterialSteel
  • Magnet MaterialFerrite
Mounting Information
  • Overall Outside Diameter6.5"
  • Baffle Cutout Diameter5.625"
  • Depth2.875"
  • Bolt Circle Diameter6.125"
  • # Mounting Holes4
Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion)
  • Sealed Volume1.53 ft.³
  • Sealed F349 Hz
  • Vented Volume3.64 ft.³
  • Vented F330 Hz
6-1/2" Poly Cone Midbass Woofer 4 Ohm
  • BrandFactory Buyouts
  • Part Number299-609
  • UPC848864006864
  • Product CategoryWoofers
  • Unit of MeasureEA
  • Product Rating
    (23 Reviews)
  • Weight1.8 lbs.
  • California Prop 65

    Warning: California residents only. Please note per Proposition 65 that this product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

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6-1/2" Poly Cone Midbass Woofer 4 Ohm
6-1/2" Poly Cone Midbass Woofer 4 Ohm is rated 4.5217 out of 5 by 23.
Rated 5 out of 5 by from Amazing valueBought 2, one for a small portable boom box and one for another project. Being that I only have a pair of pioneer bookshelf speakers and a Sony sub, I'm not sure qualified to give any sort of detailed review on the sound but I think it sounds great! Lots of bass (which as a teen is really all you care about) for only 15w going to the woofer and has very little distortion even though I put no crossover. Best woofer for the price.*A bit about the speakerThis is my first project I did as a highschool freshman so I limited my budget at $50.Used a 15w x2 tripath amp also on parts express and I just used the tweeter and mini woofer from an old speaker. Its ported with a pvc pipe thats about 7" long in total. The dimen. Are 8" tall, 12" long and 4" in depth all made from half inch mdf. Also has a built in battery that last over 3 hours on full volume (I usually never run it over half since its already loud)
Date published: 2014-06-16
Rated 5 out of 5 by from What a great sounding speaker!Bought 80, impressed so much I bought 80 more. Love them in arrays.
Date published: 2014-05-12
Rated 4 out of 5 by from Can't beat it. Even if you triple your budgetI have a set of these running active with a set of Dayton 5/8" tweeters on a Pioneer deh-80prs. Equalizer set flat besides a small boost in vocal range, tweeters turned down a few notches and it's better than any unamplified setup I have heard. I would absolutely recommend these for a midbass
Date published: 2014-05-11
Rated 5 out of 5 by from The perfect woofer for an unbelievable price!I got 2 of these woofers along with 2 part #279-002 for a luggage boombox build that I was doing, and holy moly are they GREAT. The build quality is superb, the frequency response is fantastic, and the price is oh so RIGHT! I cannot sing this woofers praises enough. Get them before they're gone!
Date published: 2014-05-08
Rated 4 out of 5 by from Great ValuePerfect drop in replacement for my rotted out Design Acoustics PS-6V SPEAKERS.It was cheaper to replace them with these then replace the rotted out surrounds.They sound at least as good as the originals. It would have been nice if they handled a bit more power.
Date published: 2014-05-02
Rated 5 out of 5 by from price can't be beatThese are unbeatable for the price. 5 bucks for a 6.5" woofer, how can you go wrong? I have put these in multiple vehicles and they have always sounded great for the casual listener. I believe they are also the same woofers that are used in the Dayton B652 bookshelf speakers, and lots of people (myself included) think they sound fantastic for the price. If you need cheap 6.5s as a replacement speaker or for a budget build, don't even think twice about these, just hit the add to cart button.
Date published: 2014-02-17

Product Q&A

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who own this product or have experience with it.
If your question requires design or troubleshooting information,
please email tech@parts-expresss.com  for a prompt reply.
6-1/2" Poly Cone Midbass Woofer 4 Ohm

88 dB 2.83V/1m = 85 dB 1V/1m?

Asked by: Chevy and Ford
Roughly yes, 2.83V into 4 ohms is 2 watts. With 1 watt you will lose about 3 dB of output.
Answered by: MattP
Date published: 2014-09-15

I believe these work fine in a ported cab, and I want a little more bass than I get with a sealed enclosure. Whats the smallest ported enclosure I could get away with? Is about 0.35 cubic feet, asking for too much/little?

Asked by: jayC
Unfortunately these require a very large ported cab due to their high Qts. A 0.35 cubic foot cab would provide the smoothest bass response. If you wanted to add a port, a 1.5" diameter x 3" port will tune the box to 56 Hz but provide a large peak in the response around 60-80 Hz.
Answered by: MattP
Date published: 2014-06-21

Putting this in series with a  4 ohm tweeter I bought years ago. A simple design, just for my woodshop speakers and I don't want to spend money on a expensive crossover. Where do I put the 4.7uF cap to block the bass for the tweeter in this series?

Asked by: jayC
Unfortunately you cannot wire a woofer and tweeter in series and only protect the tweeter. You will have to wire them in parallel and simply put the capacitor in series with the tweeter. Also, wiring a 4 ohm woofer and 4 ohm tweeter in series does not yield an 8 ohm load, the amplifier will still see a 4 ohm overall load so there is no benefit.
Answered by: MattP
Date published: 2014-04-10

Any possibility of these being in stock before the date listed?

Asked by: momax
We are at the mercy of the vendors and manufacturers in terms of the ETA dates we get. There is a possibility although there is no way to know for sure until they show up early.
Answered by: MattP
Date published: 2014-02-03

Can this be a replacement woofer for the Dayton Audio B652 6-1/2 Bookshelf Speaker? http://www.parts-express.com/dayton-audio-b652-6-1-2-2-way-bookshelf-speaker-pair--300-652

Asked by: RWS1979
This will work as a replacement although this will create a 4 ohm load which is not safe for most home stereos.
Answered by: MattP
Date published: 2014-01-16

Would these speakers work in the door of a suburban with"boom mat" type of speaker baffles or is that not enough volume?

Asked by: DPassaro
These woofers will work fine for any free air application, or basically any size sealed type enclosure. The low end will be fairly limited though, probably only reaching about 50 Hz.
Answered by: MattP
Date published: 2014-01-08

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