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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.
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List Price$26.00
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Part # 299-609
  • 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!

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
    (47 Reviews)
  • Weight1.8 lbs.
  • California Prop 65

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

View similar products to the 6-1/2" Poly Cone Midbass Woofer 4 Ohm
in the Woofers product category.


6-1/2" Poly Cone Midbass Woofer 4 Ohm
6-1/2" Poly Cone Midbass Woofer 4 Ohm is rated 4.5319 out of 5 by 47.
Rated 2 out of 5 by from B652 Replacement WoofersI bought these to replace the woofers in my B652 bookshelf speakers. I wanted to add more bass so I thought I would try them. I go & remove the woofers from my B652 bookshelf speaker cabinets & what do you know? These are the exact same model speakers that I already have. The same model number on the back of the magnet proves it. Not what I was expecting, but they work as advertised. I used them in different .45 cu. ft. boxes instead & ported them. They sound way better in a ported box then sealed if you ask me, even if they are recommend for sealed boxes. Good price & fine replacement speaker.
Date published: 2015-11-07
Rated 5 out of 5 by from Great sound and bassI used a Lepy LP-838 amplifier and with the super bass, the woofer can flex! They sounds really great. Love them. Would recommend this to EVERYONE who likes speakers.
Date published: 2015-11-02
Rated 5 out of 5 by from Bargain basement yet well made speakerUsing these for an experimental vertical array scheme. 12 units in each column and 4 columns for a total of 48 drivers. Boxes are 8 feet tall 12 inches wide (MDF) and sides are 6 inches deep (2X6 fir). I know a lot of folks seem to think vertical arrays are too sweet spot dependent, But I'm the only listener. Lots of fun and the price to build them is pretty low all things considered.Bob, KE6F
Date published: 2015-10-28
Rated 5 out of 5 by from Decent speakers for priceBought these a while back to put in my 05 dodge neon rear doors that i modified to work. End result was pretty good even though these are not meant to be mainly used for cars but works great so far. thanks
Date published: 2015-09-29
Rated 5 out of 5 by from great add on to b652'sgreat addition to the b652's with the amt tweeter, read my review on the "b652s with amt tweeter" for more detailed info
Date published: 2015-09-14
Rated 5 out of 5 by from Works very wellI bought a few moths 10 pieces and works very well.I have a questionWhich would be the total power if I add this Tweeter? https://www.parts-express.com/tymphany-bc25tg15-04-1-silk-dome-tweeter--264-1040considering the woofer of 30W (RMS)Please
Date published: 2015-08-10
  • 2015-11-27T06:21CST
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  • cp_1, bvpage1
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  • loc_en_US, sid_299-609, PRD, sort_mostRecent
  • clientName_PartsExpressInternational

Product Q&A

Get your questions answered from other customers
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

How would 4 of these in  1.24cu tower react with a 4" wide x 4" deep aero port? Should be tuned close to 62hz.

Asked by: Deiko

Hi, im looking to replace my speakers in my BMW. The ones in the BMW are 6.5 inch 2 ohm and the amp is max 40w. Would these woofers be a good option for my BMW even though they are 4 ohm and the amp is 2 ohm?

Asked by: dannz
In most cases the amplifier can drive the rated impedance or higher. a 2 ohm amp should be able to drive a 4 ohm load with no issues at all.
Answered by: Chrisf
Date published: 2015-11-17

I am building a tower speaker with 4 of these and it will be 1.47 cubic feet. What port tuning frequency would be best for these to provide the loudest bass I can get?

Asked by: matt196
A 4" diameter port that is 10" long will tune the enclosure to 45 Hz. This will provide a big peak in the response around 100 Hz, similar to turning up the bass knob, but it will not play very low.
Answered by: MattP
Date published: 2015-11-12

I plan on running these in a .50 cu. ft. ported cabinet tuned to 45Hz no matter the out come. I like all my completed speaker boxes to be very boomy. What is the lowest frequency this sett up will produce? I am hoping to be able to hit 60Hz or lower.

Asked by: Pain for Fun 1980
These will have stronger output at 60 Hz if they stay sealed. Porting them in that volume tuned to 45 will result in a huge peak around 80 Hz, rendering frequencies below that to be virtually inaudible.
Answered by: MattP
Date published: 2015-10-26

Thinking of running 4 of these per cab, series-parrallel, in a 2 way design with the Goldwood GT-520 tweeters crossed at 3k. Could you recommend enclosure size for best overall output and extension? Thanks

Asked by: LTopp
These will only really work well sealed and the optimal volume is about 3.5 cubic feet. You can get away with 1.25 heavily stuffed which will reach into the 40's in-room.
Answered by: MattP
Date published: 2015-08-31

I have used some 6-1/2 woofers in a custom Dual Reflex Bandpass box in the past. Very impressed with the output. Any help on box specs would help. I would like to use 2 or 4.  Thank you.

Asked by: SpeakerBoxing
Please contact our tech support for more help with this question, tech@parts-express.com or 800-338-0531 x1.
Answered by: MattP
Date published: 2015-08-18
  • 2015-11-27T06:44CST
  • bvseo_cps, prod_bvqa, vn_cps_3.1.6
  • cp_1, bvpage1
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  • loc_en_US, sid_299-609, PRD, sort_recentQuestionsFirst
  • clientName_PartsExpressInternational

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