Dayton Audio IB385-8 15" Infinite Baffle Subwoofer

Brand:| Model: IB385-8
Build the ultimate home theater subwoofer by doing an infinite baffle installation! The Dayton Audio IB series subwoofers are designed to produce extremely low, clean, uncolored bass without "boxed in" sound.
  • Long excursion design
  • Heavy gauge stamped steel frame
  • Extremely rigid Kevlar-impregnated paper cone
  • Heavy duty treated foam surround
  • Single 8 ohm voice coil on Kapton former
  • Bumped back plate and vented pole piece for reduced power compression
Part # 
Weight: 20 lbs.  
List Price$207.99
You Save37%
Your Price
Buy 4-up$123.31
Part # 295-455
Qty:  EA
Available Payment Methods

Product Details

Dayton Audio IB385-8 15" Infinite Baffle Subwoofer

The Dayton Audio IB series subwoofers are designed to produce extremely low, clean, uncolored bass in infinite baffle situations. Ideally, the subwoofers are situated between the listening room and an attic, basement, or garage using the floor, ceiling, or walls to separate the front and rear sound waves.

Benefits of the infinite baffle approach include extreme low-frequency output, very clean and distortion-free sound, lack of large enclosures within the room, and amazingly loud bass with modest power amplifiers. Combining high sensitivity, good mechanical damping, and excellent excursion capabilities, the IB series subwoofers are the only drivers on the market designed specifically for infinite baffle situations. Made in the U.S.A. 5 year Limited Warranty.

Product Specifications
  • Nominal Diameter15"
  • Power Handling (RMS)350 Watts
  • Power Handling (max)700 Watts
  • Impedance8 ohms
  • Frequency Response20 to 500 Hz
  • Sensitivity88.2 dB 1W/1m
  • Voice Coil Diameter2"
  • Magnet Weight90 oz.
Thiele-Small Parameters
  • Resonant Frequency (Fs)21.5 Hz
  • DC Resistance (Re)5.2 ohms
  • Voice Coil Inductance (Le)3.08 mH
  • Mechanical Q (Qms)8.92
  • Electromagnetic Q (Qes)0.63
  • Total Q (Qts)0.59
  • Compliance Equivalent Volume (Vas)8.79 ft.³
  • Mechanical Compliance of Suspension (Cms)0.26 mm/N
  • BL Product (BL)15.46 Tm
  • Diaphragm Mass Inc. Airload (Mms)207g
  • Maximum Linear Excursion (Xmax)14.3 mm
  • Surface Area of Cone (Sd)819.4 cm²
Materials of Construction
  • Cone MaterialPaper / Kevlar
  • Surround MaterialFoam
  • Voice Coil Wire MaterialCopper
  • Voice Coil FormerKapton® / Polyimide
  • Basket / Frame MaterialSteel
  • Magnet MaterialFerrite
Mounting Information
  • Overall Outside Diameter15.16"
  • Baffle Cutout Diameter13.77"
  • Depth6.34"
  • # Mounting Holes8
Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion)
  • Sealed Volume8.61 ft.³
  • Sealed F330 Hz
  • Vented Volume19.39 ft.³
  • Vented F315 Hz
Dayton Audio IB385-8 15" Infinite Baffle Subwoofer
  • BrandDayton Audio
  • ModelIB385-8
  • Part Number295-455
  • UPC844632000102
  • Product CategorySubwoofer Drivers
  • Unit of MeasureEA
  • Product Rating
    (11 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.

Similar Products

View similar products to the Dayton Audio IB385-8 15" Infinite Baffle Subwoofer
in the Subwoofer Drivers product category.


Dayton Audio IB385-8 15" Infinite Baffle Subwoofer
Dayton Audio IB385-8 15" Infinite Baffle Subwoofer is rated 4.9091 out of 5 by 11.
Rated 5 out of 5 by from Enjoyed the upgrade in bassI had considered doing an IB sub for some years. I would go online and read about them. My theater room is not a large one. To gain more room I was wanting to remove speakers from my floor area and this seemed the next step in that goal. I experimented with a pair of 12 inch drivers in my 1500 cu. ft. room and liked the results. So I ordered these and replaced the 12 inch drivers. The bass is very impressive during movies now. I had a ported system I had built and these were a step up in quality. The 12 inch drivers. I moved them to a second IB location in the theater room. So now I have the pair of 15s in a manifold in the front and a pair of 12s in a manifold on the left side wall. I cannot tell where speakers are at all. Actually it sometimes sounds like the bass is coming from other places in the room during scenes in a film. This illusion is due to upper bass range sound cues coming from the small main speakers that assist in reproducing sound effects at that moment. Example is thunder in the distance off to the right. Bear in mind the IB systems are in front and to the left. Still the upper frequencies of thunder make one think you are hearing it to the right. So I think the system is working very nicely and at a price I was delighted to pay.
Date published: 2014-05-09
Rated 5 out of 5 by from First Infinite Baffle experienceI purchased a pair of these for an infinite baffle setup. I cut a hole in the floor and built a box to fit below which houses these, and have a cast iron grate to cover it. The system replaces a Mackie active HRS120 sub, and initial impressions are that this is by far and away better even without any EQ added yet. I'm using a Crown XLS 1500 Drivecore which may be overkill for the two subs, but leaves room for expansion. I'm also using it's built in crossover feature at 78hz. Very impressed with the sound quality so far, and is the first IB system I've heard. So far no regrets and two of these is plenty for just music listening.I can't compare these speakers against any other IB speaker, but the build, sound quality, and price are all a great value.
Date published: 2013-08-05
Rated 5 out of 5 by from Super addition for Equator D5 monitorsI love my new Equator D5 monitors, but they are lacking a really low end. Because I am working at low volume, a single infinite baffle woofer did the trick. Nice and clean down to 25 hz. 20 hz is there, but drops off rapidly after that. I really don't need it that low. Powering with a 200 watt plate amplifier. Now to focus on room treatment. Thank you Parts-Express!
Date published: 2013-07-22
Rated 5 out of 5 by from Give us more IB optionsSub-30 Hz audio is not easy to achieve. First, a quick look at the Fletcher-Munsen curves shows it needs to be in the 90 dB-SPL range to even be audible. To produce that with any sort of efficiency requires a box volume approaching the size of a refrigerator. Alternately you can use a small inefficient box and smoke it with tons of power, which can get non-linear pretty fast.The IB (Infinite Baffle) concept uses a large volume of otherwise wasted space to get the efficiency needed. Do be aware that that back space will receive the same acoustic power as the desired front space. Since there is no port to help the bottom octave, you will need more cone surface area than that equivalent refrigerator box for a given output.I've used this driver in a commercial application for a video playback subwoofer in a boardroom, loaded into a 3-surface corner, disguised behind an HVAC return grille. It works great.My request for Dayton is to bring us some more IB options. I'd like to see an 18" or 21" with a 30 Hz Fs for more traditional musical applications, with xMax matched to the cone load at Fs. Obviously Qts should be near 0.7 for IB mounting. This should put the sensitivity in the mid 90s. A 4 Ohm coil would be great to pull more power from the amp. I've used the 290-698, but its lower Q did require some EQ on the bottom end.Again, Kudos to PE & Dayton for bringing to market some special-purpose drivers the major manufacturers have overlooked.
Date published: 2013-07-02
Rated 5 out of 5 by from WowMy listening room has a small door to a covered space on the outside, originally used for bringing in firewood. I replaced that door with a baffle and mounted one of these guys in it. To make the mounting stiffer, I made a clamp for the magnet assembly from a couple of pieces of 2x4 and screwed it onto the side of the house. The resulting bass is remarkable. Low frequencies are what they are; no obvious distortion or overtones (until the house starts vibrating). Driven from a 200W plate amp, it goes as loud as I can stand (and louder than my wife can).As time permits, I will dial in the response with a miniDSP, but for now I am having fun discovering low-frequency information that I didn't realize was present in recordings and movies.I like this infinite baffle approach; it was a lot easier than making a box that can withstand the internal pressure and vibration that a sub can generate, and the result sounds better - no box artifacts. Of course it helps to have an obvious place in your house to put it...I was thinking of mounting it in the fireplace, but transmission line modeling suggested that the chimney was going to introduce some interesting anomalies, and filling the chimney with fiberglass didn't seem like fun. And of course, the wife is happy that I didn't co-opt the fireplace.
Date published: 2013-01-02
Rated 5 out of 5 by from EffortlessI installed 2 of these IB in my trunk last weekend... EFFORTLESS BASS! Qualifier - I do not listen to loud music for extended periods of time. They are wired in parallel and driven by a Hifonics ZX1000 series amp (gain at minimum). At the volumes I listen to, the subs are difficult to locate, and I havent even tuned (time and phase aligned) yet.
Date published: 2009-07-27

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 tech@parts-expresss.com  for a prompt reply.
Dayton Audio IB385-8 15" Infinite Baffle Subwoofer

I have an old AudioSource SB15 and the cone is gone. I want to go the IB route in the near future. Would this woofer perform acceptably for the short term in the SB15 enclosure? It is ported but the ports can easily be plugged. Thanks Tim

Asked by: Timinator
This will work well enough as long as the ports are sealed up.
Answered by: MattP
Date published: 2014-09-04

I have 2 cabinets for bass and the foam has blown out on the old Pyle woofers :) They are 7.5 cu. ft. sealed enclosures. Is this the best replacement woofer/subwoofer for my application?

Asked by: tommy2014
This requires a bit more information in order to proceed. 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: 2014-08-26

Should these be mounted to the rear of the baffle plate (that seems to be what the large, attached gasket would indicate)?  If "rear mounted" is there any concern/consideration about flaring or rounding the baffle at these low frequencies?  Thanks!

Asked by: TedL
These can be front or rear mounted, it will depend on your specific needs. The baffle does not have to be rounded or flared at these frequencies.
Answered by: MattP
Date published: 2014-08-14

I no longer have these in IB configuration and would like to try one in trunk of my car.  It says 19 CF ported enclosure but no port size information.  Does anyone have the program that is mentioned or other information that shows the port size?

Asked by: Reek
A ported box is not recommended for this woofer especially in a car, but if you want to use a 19.5 cubic foot enclosure, the port size would need to be 6" in diameter and 9-1/4" long for the recommended tuning frequency.
Answered by: MattP
Date published: 2014-07-03

Can you recommend an amp to power two of these?  Also, I'm new to subwoofers.  How would I power two from a single amp?  

Asked by: Jimbo85281
Singe these are 8 ohm each you can easily wire them in parallel for a 4 ohm total load, then use something like our Dayton SPA500 to power them.http://www.parts-express.com/dayton-audio-spa500-500w-subwoofer-plate-amplifier--300-807
Answered by: MattP
Date published: 2014-06-15

What subwoofer is recommended for a more Transmission Line box? This driver or Dayton Audio DVC385-88?

Asked by: Anderson1701
A transmission line for either of these drivers will be very large, but the DVC model will be better suited.
Answered by: MattP
Date published: 2014-05-12

Customer Projects

Customer projects that include: Dayton Audio IB385-8 15" Infinite Baffle Subwoofer

If you built a project using this product, post it in the Parts Express Project Gallery.

Customer Discussions

If you would like to start a discussion about this product, post a thread in the TechTalk Customer Forum.
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,OH45066USA

© 1996-2014 Parts Express, All Rights Reserved