Manuals & Resources

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.
In Stock
Regular Price$26.00
You Save81%
Sale Price
Buy 25-79 $3.99
Buy 80+$3.20
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
    (42 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 4.5476 out of 5 by 42.
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? the woofer of 30W (RMS)Please
Date published: 2015-08-10
Rated 5 out of 5 by from 6.5'' wooferI got this woofer and went inside and hooked it up to my stereo and was happy. they sound very good but I did notice a little distortion when you got to the max.
Date published: 2015-07-16
Rated 5 out of 5 by from Works well!I purchased 1 of these to replace one of the stock speakers in my Dayton B652 Bookshelf Speakers because one of the speakers has blown up (my fault, I put 50watts to it and one of the speakers blew, the other speaker sounds scratchy) The new speaker sounds great again with no distortion! I'll buy 3 more of these for backups but I'll use another one for the other bookshelf speaker since it sounds scratchy. I might even buy even more!
Date published: 2015-07-06
Rated 5 out of 5 by from Excellent Value!I purchased four of these for the purposes of experimentation. Along with them, I picked up some even more affordable GRS 1TM-4 Dome tweeters. I was doing demolition on a closet in our house, and in this closet was a custom shelving system made out of nice 3/4" ply. When I pulled it out, I immediately thought it would be fun to cut some of it up and make some snazzy bookshelf speakers out of it.For my first speaker build, I was really pleased with the result. I love the sound quality. You're not going to be rattling the picture frames off the walls with these, but some of the lower frequencies will be there and presented modestly in a good recording. I played some FLAC audio files through a vintage Kenwood amplifier, and I was very pleased.I completed the project just in time for the weekend and was able to use them on the back patio for my guests to plug up their phones and play their favorite tunes. Everyone that heard them had nothing but positive reviews of the speakers performance. I highly recommend these to someone who wants to experiment and have fun on a budget. I'll surely be getting more of these in the future.
Date published: 2015-06-08
Rated 5 out of 5 by from Such a deal - Repaired some Baby AdventsI have had a pair of Baby Advents awaiting refoaming for years. seeing these replacement woofers for $5, I figured why mess with the glue and all.I ordered them, installed them--they appear to be at least as good as what Advent used, sound very nice . . . . great bang for the buck.Being realistic, these aren't Klipschorns or AR LSTs, but neither were the Baby Advents . . . very happy with this product.
Date published: 2015-06-08
Rated 5 out of 5 by from Very ImpressedI bought 8 of these speakers to build left and right towers. I wanted big and these delivered. The two towers are 4 feet tall each. Each tower has four woofers and two tweeters. We used 1/4 MDF and finished with the Acry-Tech DuraTex from Parts express. They look and sound great. I get a lot of compliments on the look and sound. The sub in the pic is a PSW10 Polk to show scale. I highly recommend.
Date published: 2015-04-16
  • 2015-08-28T21:00CST
  • bvseo_cps, prod_bvrr, vn_cps_3.1.6
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_42
  • 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  for a prompt reply.
6-1/2" Poly Cone Midbass Woofer 4 Ohm

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, or 800-338-0531 x1.
Answered by: MattP
Date published: 2015-08-18

are these still on buyout?

Asked by: ljk2000
Yes, they are still on Buyout.
Answered by: MattW
Date published: 2015-07-22

Hi. I would like to use two of these drivers in an isobaric 4th order bandpass design. Are you able to help me with a suggested box design for this? Thank you. Also, I am unable to get cone excursion values when playing with it in WinISD. MMS? Thanks.

Asked by: AudyoVidyo
Four of these mounted push-pull will require a fairly large enclosure volume. The sealed box will need to be 2.9 cubic feet, the vented box will require 1 cubic foot with a 3" diameter, 3" long vent. This will provide a passband from 38 to 90 Hz. The drivers will handle full RMS power to just below 50 Hz before they run out of excursion.
Answered by: MattP
Date published: 2015-06-23

boombox build. would this woofer work well with the GRS 1TM-4 Dome tweeter? what crossover would be best? would a 1-2" full range like the Dayton Audio CE Series CE32A-4 1-1/4" 4 Ohm work better as the highs and crossed over at 3000khz or so?

Asked by: brian d
Please contact our tech support for more help with this question, or 800-338-0531 x1.
Answered by: MattP
Date published: 2015-06-16

Could I use these with tweeters for my new surround system. I use a separate powered pair of subwoofers,so thinking these would work with two way crossovers.

Asked by: Strader
This requires a bit more information in order to proceed. Please contact our tech support for more help with this question, or 800-338-0531 x1.
Answered by: GregT
Date published: 2015-05-27

Hi: I purchased four of these woofers with the goal of making two speakers running the drivers in series for 8 ohms. What is the best size of sealed cabinet for this application? Also it sounds like these will work well with a 2500Hz to 3000Hz crossover?

Asked by: flj1
You will want to use a 1.5 Ft3 box tuned to 56 Hz for two drivers wired in series. Yes, a cross over set at 2.5 to 3 KHz will work well.
Answered by: MattW
Date published: 2015-04-23
  • 2015-08-28T20:58CST
  • bvseo_cps, prod_bvqa, vn_cps_3.1.6
  • cp_1, bvpage1
  • co_hasquestionsanswers, tq_29
  • loc_en_US, sid_299-609, PRD, sort_recentQuestionsFirst
  • clientName_PartsExpressInternational

Recently Viewed Products

Get Deals
emailed to you every week.

Be the first to hear about new and exciting products,special pricing and incredible deals!

See This Week's "GET DEALS" Email
Parts Express
725 Pleasant Valley Dr.Springboro,OH 45066USA

© 1986-2015 Parts Express, All Rights Reserved

Live Chat Software