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
    (28 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.

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6-1/2" Poly Cone Midbass Woofer 4 Ohm
6-1/2" Poly Cone Midbass Woofer 4 Ohm is rated 4.5357 out of 5 by 28.
Rated 5 out of 5 by from You won't do better for $5Bought a pair of these to use in an old pair of Zenith Omnidirectional speakers. First off thanks PE as always for accurate info, these were the exact dimensions noted and thus fit my project perfectly. I mounted some 1/2" Tang Band tweeters on a thin aluminum rod in the center of these firing up through a new grille into the diffuser, simple first order XO at 5k. Sound much better than they should, very impressed with how clean they are crossed this high, I know that if they weren't in an omni it might be a different story on axis, but the bass and mid bass is quality as well for such a cheap driver. Highly recommended!
Date published: 2014-11-02
Rated 5 out of 5 by from Nice speakers for a great priceI bought them for a suitcase boom box and they work great. for the price and it has great sound
Date published: 2014-10-26
Rated 5 out of 5 by from Great improvement over factoryI installed these in my 97 tahoe doors, to replace the dry rotted factory speakers. I kept the factory tweeters, and upgraded the head unit. This combo sounds really good together. Now if they only made a 4x10 as well...I
Date published: 2014-09-27
Rated 3 out of 5 by from Get what you pay for!I had been using the GRS 6PR-8 6-1/2" as my "go-to" 6.5 but after reading the reviews here wanted to give these a try at $4 per. Not exactly a fair comparison, the biggest difference is the VERY noticeable power handling at only 30w RMS. Compared to the GRS at 2x that spec I was underwhelmed at the low amount of power these could handle, even at 4 ohms they were less than what I could drive the GRS to. Comparison was done in a 2-way, .38 sealed cabinet, exchanging drivers. That said the GRS are more than 2x $$ so you simply need to match the product to the application. Not sure how they would do as mids in a 3-way but again that low power RMS bothers me. These $4 buyouts seem best suited to B652 size sealed cabinet bookshelf builds that will not be asking for too much power. Personally the 60w RMS from the GRS is a power point I would not go below but these might have a fit for some users looking for low cost, small power projects. They sound good just can not turn them up very much. I have yet to try 2 of them wired for 8 ohms but then you are getting into a bigger cabinet and losing the cost savings, might just as well buy the GRS.
Date published: 2014-09-23
Rated 5 out of 5 by from Great!Out these in to replace the original woofers in my AR TSW-110 bookshelf speakers. They are amazing! They never sounded so good. I highly recommend these as a low cost replacement speaker.
Date published: 2014-09-17
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

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

Sealed or Ported? Looking at building 4 speakers for about a 20'x30' room that will be in the corners of the shop. Would a ported or sealed configuration work better for this? All types of music, some is somewhat bass heavy like hip hop, techno, etc.

Asked by: xb2fergie
These woofers like a sealed enclosure, roughly 0.5 cubic feet each. Porting will give you a bloated bass sound and limit overall power handling.
Answered by: MattP
Date published: 2014-11-24

9 of this speaker in sealed box final load of 4 ohms - shared air space - what should my cubic ft goal be to build to for strong response from 80hz and up ?  i hear shared enclosure of multiple woofer reacts diffrently than single ?

Asked by: brian84corvette
You will get the same extension with multiple woofers as you would with one, but your overall sensitivity will go up. The optimal volume for nine of these is almost 7 cubic feet, but if you are only interested in getting to about 80 Hz, you can cut this volume down significantly. Anything between 1.5 and 2 cubic feet will give you extension to 80 Hz, I would recommend heavy fill.
Answered by: MattP
Date published: 2014-11-03

Would these be good replacements for boston acoustics A40 speakers?

Asked by: Tazman
We do not have a cross reference available for this type of thing. 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: 2014-11-21

what would be a good resistor and tweeter for this speaker? I would like to build a 2-way set up for a lepail 2020+ amplifier 

Asked by: beasten13
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: 2014-11-21

The product details say: "The damped poly cone creates smooth sound from 45 Hz all the way up to 3,000 Hz....." Yet the product specifications say 50 to 6000 Hz. Why the difference?

Asked by: HW13
The frequency response is based on the Fs of the driver as well as the upper limit before the response starts to droop. This has a very smooth response from Fs (52 Hz) up until 3kHz, where the response starts to encounter a breakup peak or null, and then finally starts rolling off naturally around 6kHz.
Answered by: MattP
Date published: 2014-11-21

In the description it says, creates smooth sound from 45 Hz all the way up to 3,000 Hz . Did PE measure some of these? Thanks

Asked by: JackZ
These woofers are very similar to the woofers in our B652 speakers which share a very similar response. We do not have any frequency response graphs available for these woofers.
Answered by: MattP
Date published: 2014-11-21

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