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Dayton Audio ST305-8 12" Series II Woofer

Brand:| Model: ST305-8
Overview
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.
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
Part # 
295-120
Weight: 15.33 lbs.  
IN STOCK
List Price$129.99
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Part # 295-120
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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 dB 1W/1m
  • Voice Coil Diameter2.5"
  • Magnet Weight56 oz.
Thiele-Small Parameters
  • Resonant Frequency (Fs)29.6 Hz
  • DC Resistance (Re)6 ohms
  • Voice Coil Inductance (Le)3.07 mH
  • Mechanical Q (Qms)10.55
  • Electromagnetic Q (Qes)0.36
  • Total Q (Qts)0.35
  • Compliance Equivalent Volume (Vas)4.52 ft.³
  • Mechanical Compliance of Suspension (Cms)0.36 mm/N
  • BL Product (BL)15.92 Tm
  • Diaphragm Mass Inc. Airload (Mms)81.33g
  • 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
    (41 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 4.3902 out of 5 by 41.
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
Rated 5 out of 5 by from So Helpful!When a woofer in my very expensive Genelec 1037a speakers failed because the form surrounding it didn't like the humidity here in Hawaii I wasn't sure where to turn. The Genelec factory had no replacement parts and no suggestions. Parts Express discussed the specs with me and these woofers have done a terrific job getting my Gelelec's back into my recording studio. Thanks!
Date published: 2014-04-09
Rated 5 out of 5 by from JBL 126A replacementI stumbled across a set of JBL Jubal L65 speakers a couple weeks ago. Unfortunately the original woofers were replaced with pyle 12" woofers. I started the search for replacements without much luck and the only source was that auction site. The pricing too for original drivers was crazy. i ended up calling PE for a recommendation and ended up with a pair of the series 2 woofers. They were a drop in and after hooking them up was really surprised at how well they fit with the driver arrangement.No complaints as of yet and the original woofer was crossed at 1000hz. well bult and made in america to boot! They are not yet fully broken in and given some more listening time should sound even better.
Date published: 2014-04-01
Rated 5 out of 5 by from Great Woofer for the money!!Bought two of these to replace a couple of dry rotted woofers I had in a set of 30 year old speakers that I bought with a stereo stand system. Was not expected too much from these floor cabinets even after the replacement; they were not $500 speakers in the first place. But WOW, these new woofers made the speakers sound like a million bucks!! Very pleased. Nice deep bass and evenly matched. Good value for the price.
Date published: 2014-01-30
Rated 5 out of 5 by from Converted Fender Twin Reverb to Hi-fiUsed this speaker along with a horn, driver and crossover to convert an Fender Twin guitar amp to use it for keyboards and acoustic guitar. ++++++ worked beautifully.
Date published: 2014-01-25

Product Q&A

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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.
Dayton Audio ST305-8 12" Series II Woofer

I have an older pair of cerwin/vega r-211s,will these 12" daytons st305-8series ll sound as good ?I have a twin powered harmon /kardon 750 amp to drive them

Asked by: d nick
The Series II woofers are and have been very popular replacements for Cerwin Vega speakers for many years and are usually what I recommend for this type of application. I cannot directly comment on the sound but they have been very well received from our customers.
Answered by: MattP
Date published: 2014-12-11

I own pair Cerwin's Vega E-312, the bass start to make a noise, (not scratch)  I take out the originals and  and they look cheap and not heavy weight.  My amp has 125 rms/ch and I think maybe they need more powerfull drivers. Advice please. Thanks

Asked by: Jakecr
It could be that your woofers are getting worn out. These Dayton Series II woofers are very popular replacements for that application and are highly recommended.
Answered by: MattP
Date published: 2014-12-11

I need replace the 12" woofer on my CERWIN VEGA AT-12 and the one similar I have available is a 8 ohm. Since the original speaker is 4 ohm I need know if I can just replace with the 8ohm and sacrifice some power or maybe install 2 X 8ohm = 4 ohm?

Asked by: CuckoJR
The Series II woofer is a very popular replacement for this speaker. This will drop the available power from your amp, but only by 3dB. If you wanted to use a single 4 ohm woofer, the Dayton Classic 12" Subwoofer will also work for this application and is 4 ohm.http://www.parts-express.com/dayton-audio-dcs305-4-12-classic-subwoofer-4-ohm--295-204
Answered by: MattP
Date published: 2014-11-24

how would this woofer perform in a vented cabinet with a volume of 1.8 cubic ft? If recommended, what would F3 be? What would vent length and diameter be?  Thanks

Asked by: JCfogerty
This woofer will work pretty well in that volume. The tuning frequency will be slightly higher than "optimal" but it will still work fine. I would recommend two 3" diameter ports that are 10" long for a tuning frequency of 42 Hz.
Answered by: MattP
Date published: 2014-10-28

With 70 watts of power, would these speakers have advantages over the DC300-8? They will go into ported 1.5cu ft cabinets. Also can I extend the 2.5in dia port tube with an elbow and extend up inside or reduce port diameter to tune the cabinet lower?  

Asked by: Mike50
With only 70 watts there will be no real difference between these drivers in terms or tuning and output. The Series II will work a bit better in the smaller volume, but the audible difference would be negligible.
Answered by: MattP
Date published: 2014-10-20

I need new woofers for my Sansui sp-2500 speakers (1.53 cu ft). The originals say 6ohm 25watt, and have an spl of 98db. My Sansui 7000 @ 70 watts rms per channel will be running these. Is this speaker a good replacement; other cheaper good candidates?

Asked by: Mike50
This woofer will work well, the sensitivity of the Sansui speakers is pretty optimistic. The less expensive Dayton Classic DC300 will also work well.http://www.parts-express.com/dayton-audio-dc300-8-12-classic-woofer--295-320
Answered by: MattP
Date published: 2014-10-17

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