Pyramid WX85X 8" White Poly Woofer

Brand:| Model: WX85X
These classic quality, high-power drivers feature a white polypropylene cone that adds a distinctive look to any installation. Feature strong strontium magnets for high power handling, specially designed rubber surrounds, and bumped back plates for extended excursion.
  • Bumped backplate for increased mechnical excursion
  • Unique rubber surround minimizes cone modes
  • Designed for use in sealed enclosures
Part # 
Weight: 3.1 lbs.  
List Price$42.99
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Buy 4-up$12.28
Part # 290-272
Qty:  EA
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Product Details

Pyramid WX85X 8" White Poly Woofer

These classic quality, high-power drivers feature a white polypropylene cone that adds a distinctive look to any installation. Feature strong strontium magnets for high power handling, specially designed rubber surrounds, inverted-style dustcaps, and bumped back plates for extended excursion. Two year manufacturer's warranty.

Product Specifications
  • Nominal Diameter8"
  • Power Handling (RMS)100 Watts
  • Power Handling (max)300 Watts
  • Impedance4 ohms
  • Frequency Response54 to 3,200 Hz
  • Sensitivity87.7 dB 1W/1m
  • Voice Coil Diameter1.5"
  • Magnet Weight50 oz.
Thiele-Small Parameters
  • Resonant Frequency (Fs)54.3 Hz
  • Mechanical Q (Qms)2.85
  • Electromagnetic Q (Qes)0.71
  • Total Q (Qts)0.57
  • Compliance Equivalent Volume (Vas)0.61 ft.³
  • Maximum Linear Excursion (Xmax)2.3 mm
Materials of Construction
  • Cone MaterialPoly
  • Surround MaterialRubber
  • Voice Coil FormerKapton® / Polyimide
  • Magnet MaterialFerrite
Mounting Information
  • Overall Outside Diameter7.99"
  • Baffle Cutout Diameter7.13"
  • Depth3.7"
  • # Mounting Holes4
Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion)
  • Sealed Volume0.23 ft.³
  • Sealed F381 Hz
  • Vented Volume0.62 ft.³
  • Vented F340 Hz
Pyramid WX85X 8" White Poly Woofer
  • BrandPyramid
  • ModelWX85X
  • Part Number290-272
  • UPC068888702683
  • Product CategoryWoofers
  • Unit of MeasureEA
  • Product Rating
    (22 Reviews)
  • Weight3.1 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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Pyramid WX85X 8" White Poly Woofer
Pyramid WX85X 8" White Poly Woofer is rated 4.5455 out of 5 by 22.
Rated 5 out of 5 by from The perfect cost effective replacements.I have 2 pair of vintage Infinity RSe speakers from the 80s. The woofer on one of them had recently blown and was buzzing really bad. To replace these woofers with genuine Infinity replacement woofers would have been very expensive. The original Infinity woofers were 4 ohm polypropylene woofers, and the specs on these Pyramid replacements looked to be a good match. Although the frame of the Pyramid woofers are slightly smaller than the original Infinity woofers, they still fit fairly well and I just angled the screws into the speaker cabinet. I can't really call them vintage Infinity speakers anymore, but they sound fantastic at a fraction of the cost and I am extremely happy with the results.
Date published: 2014-02-23
Rated 5 out of 5 by from Great value for the priceRebuilt some old yamaha speaker and this 8" worked better than the originals.
Date published: 2013-09-13
Rated 4 out of 5 by from Good woofer/ Sub woofer.Using this with 2 4" woofers and a 1" dome tweeters in ~1.75 cub Box w/ 3 1" vents so i don't distort the woofers. Not bad, Musical enough. warm enough. How much did they cost?
Date published: 2013-08-24
Rated 5 out of 5 by from Great value!Bought these woofers for my 1999 Celica. They fit perfectly into the Celica door housing and generate a great sound. The price was right and the delivery was earlier than projected.
Date published: 2012-10-26
Rated 5 out of 5 by from Very good speaker for the price!I purchased these woofers and installed them as replacements for my bother's speaker cabinets.I had no install problems and when I tested the speakers out, they sounded excellent. I know my bother will be happy with them too!
Date published: 2011-08-01
Rated 4 out of 5 by from Nice for the PriceI replaced the recently blown woofer in my 15 yr old home theater in a box with this speaker. It never thumped this hard. I used to shake the 1st floor from the basement. Now it rumbles the second floor too. It sounds great and worked with the same sized hole and amp. Can't ask for more than that on $17.
Date published: 2010-09-14

Product Q&A

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Pyramid WX85X 8" White Poly Woofer

can i plug this into my phone's earphone input?

Asked by: koolkid88
If you want to create 2 paperweights or a painful personal lesson, yes. Absolutely.Otherwise, no.Also, speakers, as a general rule, tend to work best for output, not input. And the amplifier you use must be appropriate for the Ohms rating of the speaker.
Answered by: TheNuck
Date published: 2014-05-08

What frequency range would you recommend running these over? I see the response range goes up to 3200hz but I can't find a graph to show how smooth that is.

Asked by: Gr8White
Due to beaming, a general rule would be not to cross an 8" driver very high, no higher than about 1,500 Hz. It is probably fairly smooth up to this frequency however Pyramid does not provide a frequency response curve for these drivers.
Answered by: MattP
Date published: 2014-04-24

can i use these with a home stereo receiver approximately 60 watts per channel

Asked by: jdip
The wattage is not a problem, but it would be best to check the impedance that the amplifier can drive. These are 4 ohms so they can damage amplifiers that are restricted to 8 ohms.
Answered by: Chrisf
Date published: 2014-04-11

Will this replace a factory woofer in a 2001 Yukon non Bose? The orginal is an 8 inch 2 ohm with the non Bose factory system. I'm not looking to rattle anything just trying to get the basic bass back. Looking to plug and play.

Asked by: Knownothing
As long as you have verified the dimensions this will work fine as a replacement. The 4 ohm load will get slightly less output from the amplifier but this should not make an audible difference.
Answered by: MattP
Date published: 2014-02-12

Will these work in an infinite baffle situation? Two of these mounted in fold down seat pass through with a 9 cubic foot trunk

Asked by: Dirtbag
Yes these will work well as an IB type driver.
Answered by: MattP
Date published: 2014-02-06

I want 2 of these woofers in the same sealed box, should i partition the box for each woofer? and what is the ideal volume for a dual sealed box.

Asked by: Bridawg
You do not have to partition the enclosure, this does not serve much of a purpose other than bracing the walls. I would recommend 0.6 - 0.8 cubic feet for both woofers sealed.
Answered by: MattP
Date published: 2013-07-18

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