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Dayton Audio ST385-8 15" Series II Woofer

Brand:| Model: ST385-8
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. Suitable for pro sound or home audio subwoofer use.
Highlights
  • Natural sounding paper cones that are chemically treated for extra durability and long life
  • Unique suspension system
  • Suitable for pro sound or home audio subwoofer use
  • Made in USA
Part # 
295-130
Weight: 20 lbs.  
IN STOCK
List Price$180.99
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Part # 295-130
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Product Details

Dayton Audio ST385-8 15" Series II Woofer

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 combination of a heavy magnet structure, vented pole piece, bumped backplate, and large voice coil provides excellent power handling capability with high efficiency and very low distortion. Unique 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 Diameter15"
  • Power Handling (RMS)300 Watts
  • Power Handling (max)600 Watts
  • Impedance8 ohms
  • Frequency Response20 to 1,000 Hz
  • Sensitivity89.5 dB 1W/1m
  • Voice Coil Diameter2.5"
  • Magnet Weight90 oz.
Thiele-Small Parameters
  • Resonant Frequency (Fs)18.8 Hz
  • DC Resistance (Re)5.8 ohms
  • Voice Coil Inductance (Le)4.09 mH
  • Mechanical Q (Qms)8.3
  • Electromagnetic Q (Qes)0.33
  • Total Q (Qts)0.32
  • Compliance Equivalent Volume (Vas)10.63 ft.³
  • Mechanical Compliance of Suspension (Cms)0.3 mm/N
  • BL Product (BL)22.41 Tm
  • Diaphragm Mass Inc. Airload (Mms)240.6g
  • Maximum Linear Excursion (Xmax)7.9 mm
  • Surface Area of Cone (Sd)850.1 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 Diameter15.15"
  • Baffle Cutout Diameter13.77"
  • Depth6.06"
  • Bolt Circle Diameter14.56"
  • # Mounting Holes8
Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion)
  • Sealed Volume1.67 ft.³
  • Sealed F348 Hz
  • Vented Volume4.27 ft.³
  • Vented F329 Hz
Dayton Audio ST385-8 15" Series II Woofer
  • BrandDayton Audio
  • ModelST385-8
  • Part Number295-130
  • UPC844632000058
  • Product CategoryWoofers
  • Unit of MeasureEA
  • Product Rating
    (30 Reviews)
  • Weight20 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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Reviews

Dayton Audio ST385-8 15" Series II Woofer
Dayton Audio ST385-8 15" Series II Woofer is rated 4.6 out of 5 by 30.
Rated 5 out of 5 by from Product far exceeded my expectations.When I needed help with placing order, your representative was very kind, patient, courteous and extremely helpful,
Date published: 2013-09-18
Rated 4 out of 5 by from Great performer, lousy workmanshipOkay, so we've got this darn good woofer that performs admirably. Then Dayton glues this cheesy faux cork gasket on top of the existing paper gasket for no good reason. The fake cork is so poorly adhered to the paper gasket that just a slight nudge will require you to re-glue it. Over and over again. Finally, a woofer of this caliber deserves push-button terminals, not the cheapie solder lugs.
Date published: 2013-05-24
Rated 1 out of 5 by from High Hopes, Huge DisappointmentI bought a pair of these speakers based on their excellent advertised specs and rave reviews on this site. I used to work with Dayton Audio speakers before and enjoyed decent workmanship and good price/performance ratio. My idea was to replace stock 15-inch woofers in my 3-way home speakers. The Fs of 19Hz would have worked great with the tuneable phase ports of the speakers.The items arrived fast as usual and were nicely packed. The first observation revealed a treated paper cone being extremely tacky. It would work as a magnet to all the dust. However this treatment was probably needed to achieve higher mass of the cone to reach the promised 19Hz frequency.Unfortunately there was no way to confirm the superb properties of the woofers, since both of them were defective. One would give a cracking sound at a moderate volume, indicating the voice coil catching on the core at some displacement. The other one had almost no output since its voice coil was stuck for good. Two defective speakers out of two clearly indicated a quality control problem.I decided not to take more chances and returned the speakers for a refund. The Parts Express extraordinary return policy worked well as expected.
Date published: 2012-04-11
Rated 4 out of 5 by from Good solid bassThese were replacements for my solid Walnut speakers that I built in high school in 1976! They were a drop in fit and sound excellent, however....beware, the voice coil leads are crimped to the frame connector, not soldered! This is really unacceptable. I would advise anyone buying Dayton speakers to look at these and SOLDER the leads!, The only time Ive ever seen this crimping before was in a vintage Fender amp with the same cheap crimping job! Other than that and the fact that shortly after I bought these the price dropped to $99 from $139 (on sale....really? for how long?) they are a good speaker.
Date published: 2012-01-09
Rated 5 out of 5 by from Great all around performanceI am using two of these woofers in 2.75 cu.ft. sealed enclosures for each one actively crossed-over at 70Hz/24dB per octave with a clean 250w/ch driving them. A while back I purchased two 15" Quatro subs and love them, but when I came back to purchase two more I found that Dayton does not make them anymore. I decided to try these since the specs were almost the same except for a higher frequency response (these are woofers, not subwoofers). The performance and sound quality are right on par with the Quatro, even when used as a sub. Bass is tight and well controlled even at higher power levels, low frequency extension is very good but would probably be better in a larger sealed enclosure or vented enclosure (3-3.5 cu.ft. sealed would be awesome). Over all I'm very pleased with the results and the sound quality and will be using this woofer again for future projects. I gave a lower features rating for the terminals and the front gasket always comes loose and has to be glued back in place with woofers in this price range. I wish the terminals were spring loaded push type like the Quatro has, but other than that these are an incredible value and I recommend them highly.
Date published: 2011-12-26
Rated 5 out of 5 by from 3-Way Tube Design Full RangeMy first speaker build - "crazy engineer gets idea and hands dirty" - I used these Daytons as woofers in a pair of three-way speakers I built using 24"sonotubes for cabinets in a ported enclosure design. With simple design via the stated parameters, they effortlessly provide clean response down to 20Hz. Not booming bass, just full low-frequency response. Amazing what speakers with this range of response sound like. "Unhurried" bass response; not pressured, not loud; just full rage. They can really fill a big room with sound. I first tested them outside in a 2-acre plot. Just great in large spaces.Please excuse the "trash can" stands and lack of paint in the pictures.I plan to use these woofers in similar enclosures as powered subs.
Date published: 2011-07-18

Product Q&A

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Dayton Audio ST385-8 15" Series II Woofer

If I wanted to create a vented design [4.5 cubic feet] via a rounded edges slotted port or a 4" port, what what the size or length be, respectively? I'm trying to minimize port chuff on the bottom end.

Asked by: Kekelsauce
A dual flared 4" port will need to be 14" long for a tuning frequency of 22 Hz. A slot port would need to be 3" x 6" and 20" long for the same tune. For the lowest vent velocity, the slot port will likely be better.
Answered by: MattP
Date published: 2014-02-13

Witch 15" woofers will fit the PA knock-down trapezoid speaker cabinet part # 245-326, and what is the top 3 woofers that fit.

Asked by: sibercat
There are many many options that will work in that enclosure. The top three can only be determined by your specific application requirements.
Answered by: MattP
Date published: 2014-01-20

if I were to put this driver in a 10 qubic ft sealed box what would be my low freq cut off point. my free online calculator suggests 41 hrtz for 2.5

cu.ft the problem is it doesn't allow input for different box sizes. 41 isn't bad for that sized box but I wouldn't mind at all buildinga bigger box if I could get down in the 20's of hertzes.
Asked by: spunky
In a sealed box, I don't see a lot of changes in the F3 or 3 db down point. The main difference in the larger cabinet is the rolloff slope. The 2.5 cubic foot box is 15 db down at 20 Hz and the 10 cubic foot box is 9 db down at the same frequency. The cone is also not controlled as well in the larger box.
Answered by: Chrisf
Date published: 2012-11-27

I have a prebuilt box that is a little over 4 cubic feet and has 2 3 inch ports, each about 4 inches long. For this woofer, what adjustment would I ne

Asked by: denzee300
This woofer works very well in 4 cubic feet vented, you will just need to extend the port length to about 12" for a lower tuning frequency of 25 Hz.
Answered by: MattP
Date published: 2012-11-16

whats the recommended ported enclosure for it

Asked by: dwal
Most manufacturers DO post a "recommended" enclosure, even though they are or should be fully aware that you cannot have such a thing that works with all different size rooms, seating positions, input power levels, response requirements, etc. The location of the enclosure in relation to the room walls/corners, as well as in relation to the listeners position, is just as important as the location of the port and location of the subwoofer cone ON the enclosure. If the room has hardwood floors, there is a difference in how the enclosure would be designed versus a thick-pile carpet. I recommend you, and everyone else who asks this type of question, to search the internet for acoustic engineering services. A seriously qualified engineer should be able to design exactly what is needed to accomplish your specific goals. They will charge for their service. But, you would not buy a 500HP motor for your camaro all to throw a cheesy transmission on it would you? It's all about how the entire package works together as a whole. Manufacturer blanket recommendations can guarantee nothing in terms of performance/response or "what you'll hear".Best regards
Answered by: ThaiBoxing101
Date published: 2013-02-08

What port size[s] would I need for a 6.5 cu ft box. please?

I'm hoping to hear my pipe organ records as they should be!
Asked by: jackomancy
In your 6.5ft³ enclosure, you'd want two 3" ports about 11" long each. This will tune your box to around 21Hz, and provide an F3 frequency of 23Hz. In this configuration, the ST385 should handle at least 200 watts before running into any excursion problems.
Answered by: RussR
Date published: 2012-07-18

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