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Dayton Audio ST305-8 12" Series II Woofer

Brand:|Model: ST305-8|Part # 295-120
The new generation of Dayton Audio Heavy Duty woofers features natural sounding paper cones that are chemically treated for extra durability and long life. The ST305-8 12" Series II woofer is suitable for pro or home audio subwoofer use.
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Part # 295-120
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Highlights
  • Natural sounding paper cones that are chemically treated for extra durability and long life
  • Consists of a rubber surround and large flat spider for superior damping
  • Feature a large magnet structure
  • Made in USA

Product Details

Dayton Audio ST305-8 12" Series II Woofer

The Dayton Audio ST305-8 Series II heavy duty 12" woofers feature a large magnet structure, vented pole piece, bumped backplate, and large voice coil. This combination provides excellent power handling capability, high efficiency, and very low distortion. The ST305-8 speaker's suspension system consists of a rubber surround and large flat spider for superior damping characteristics and outstanding transient response. Made in the USA.



Product Specifications
  • Nominal Diameter12"
  • Power Handling (RMS)275 Watts
  • Power Handling (max)550 Watts
  • Impedance8 ohms
  • Frequency Response25 to 2,000 Hz
  • Sensitivity92.2 dB 2.83V/1m
  • Voice Coil Diameter2.51"
  • Magnet Weight56 oz.
Thiele-Small Parameters
  • Resonant Frequency (Fs)26.2 Hz
  • DC Resistance (Re)6.2 ohms
  • Voice Coil Inductance (Le)3.62 mH
  • Mechanical Q (Qms)7.50
  • Electromagnetic Q (Qes)0.35
  • Total Q (Qts)0.34
  • Compliance Equivalent Volume (Vas)5.79 ft.³
  • Mechanical Compliance of Suspension (Cms)0.42 mm/N
  • BL Product (BL)15.9 Tm
  • Diaphragm Mass Inc. Airload (Mms)87.2g
  • Maximum Linear Excursion (Xmax)8 mm
  • Surface Area of Cone (Sd)506.7 cm²
Materials of Construction
  • Cone MaterialCoated Paper
  • Surround MaterialRubber
  • Voice Coil Wire MaterialCopper
  • Voice Coil FormerKapton® / Polyimide
  • Basket / Frame MaterialSteel
  • Magnet MaterialFerrite
Mounting Information
  • Overall Outside Diameter12.03"
  • Baffle Cutout Diameter10.95"
  • Depth6.25"
  • Bolt Circle Diameter11.59"
  • # Mounting Holes8
Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion)
  • Sealed Volume1 ft.³
  • Sealed F368 Hz
  • Vented Volume2.52 ft.³
  • Vented F341 Hz
Dayton Audio ST305-8 12" Series II Woofer
  • BrandDayton Audio
  • ModelST305-8
  • Part Number295-120
  • UPC844632000041
  • Product CategoryWoofers
  • Unit of MeasureEA
  • Product Rating
    (45 Reviews)
  • Weight15.33 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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Reviews

Dayton Audio ST305-8 12" Series II Woofer
Dayton Audio ST305-8 12" Series II Woofer is rated 4.4444 out of 5 by 45.
Rated 5 out of 5 by from Great value!!I bought these to replace the woofers in my old Jensen speakers. I thought the speakers sounded good until the foam rotted out. These sound twice as good as the ones I replaced.
Date published: 2015-12-15
Rated 5 out of 5 by from Great woofers.I replaced the old Infinity RS 2.5 woofers with these speakers, and I have to say they sound as good or better than the originals did.Parts Express is THE place to shop for replacement parts, or parts for your builds.
Date published: 2015-10-02
Rated 5 out of 5 by from VERY DEEP BASS!!!!I gutted an old pair of Electro-Voice "Encore 77's" and replaced everything with parts I got from Parts Express. Here's a picture of my "Franken-Speaker". I'm using an Eminence crossover, a Dayton AMT mini, a Dayton 2" dome mid and the ST305-8 woofer. The sound I'm getting through these speakers is stellar. I chose components that could handle lots of power as I'm using a Carver M1.5t to drive them to concert volume levels. And yet when playing "Vangelis", the strings and piano are sweet as audible honey. I would easily compare them to speakers in the 2,000$ range. Parts Express sells the best components for DIY'ers like me, and the results are awesome.
Date published: 2015-05-17
Rated 5 out of 5 by from Very Impressed!I've replaced 2 blown woofers in my satellite speakers,when I first powered these they sounded excellent I thought and was so happy,that was almost 5 yrs ago being powered bya a crown xls 802 and still sound as good as they did the day I bought them,Thanks parts express..ps my order came fast packing was excellent except for 1 woofer was bad,parts express no question asked replaced the bad one,kudo's parts express and have bought a 80hz low pass filter from them also,my 18 inch sub sounds tight!..Thanks...
Date published: 2015-02-08
Rated 5 out of 5 by from Great sounding speakerPlays awesome, would recommend this to my friends, great to play outdoors on my deck.
Date published: 2014-07-01
Rated 4 out of 5 by from Decent woofer for the money.I bought these woofers to replace the ones in my home built 3-way speakers built in the 90s. One of the original Nippon 12" woofers was bad (voice coil scuffing). So I used these Dayton ST305-8 as replacements. They have plenty of bass and handle plenty of power as I am powering them with my vintage Adcom GFA-1amplifier. They do have a slightly different response than my old Nippons (a little peaky) but overall I am satisfied.
Date published: 2014-05-08
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Product Q&A

Get your questions answered from other customers
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Dayton Audio ST305-8 12" Series II Woofer

Would these work in my Technics SB-LX70 speakers?

Asked by: majicjester
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: 2015-12-30

I have some 30 yr old Infinity Q5 speakers that a woofer has gone bad. It has 4 inputs/connectors going to speaker. 1. Can I replace with a speaker with only 2 connections? If not do you have a 4 connection 12" woofer I can purchase.

Asked by: bruiser
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: 2015-11-30

would this be a good upgrade for my paradigm pdr12 subwoofer?

Asked by: Buddyroe1
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: 2015-11-24

hi, what is the volume of the driver , i mean how much space does the driver fill in the cabinet ? i would need that to calculate box volume .

Asked by: mdrb
The displacement of this woofer is 0.11 cubic feet.
Answered by: MattP
Date published: 2015-04-29

can I replace a set of klipsh heresy k-22 woofers with the st305-8 12" I can't find info on crossover freq. or woofer impedance of k-22's

Asked by: jaguar jak
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: 2015-04-14

These drivers are the perfect match for a project I am drafting. However the gasket looking material on the frame doesn't suit me. Is this material relatively easy to remove? 

Asked by: jparmeley91
The gasket on this woofer is a laminated cardboard/paper type and can be relatively easy to remove if this is something you would like to do. Be careful not to cut the surround.
Answered by: MattP
Date published: 2015-03-02
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