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
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Your Price
Buy 4-up$123.31
Part # 295-455
Qty:  EA
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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
    (13 Reviews)
  • Weight20 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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Dayton Audio IB385-8 15" Infinite Baffle Subwoofer
Dayton Audio IB385-8 15" Infinite Baffle Subwoofer is rated 4.9231 out of 5 by 13.
Rated 5 out of 5 by from WOW!2 installed, wired in parallel, with a BASH 300 amp. The bedroom behind my living room's front wall is my "speaker box" for the living room. The house rocks!....shakes, rattles, and rolls.
Date published: 2015-02-03
Rated 5 out of 5 by from great whole home sub.. your niebors as well!!!2 x15 ib drivers....Dayton rack 1000 watt amp (really 960 watts)....wired to 4 ohms.....garage as rear enclosure...tightest bass reproduction I have ever heard...will take a while to break in ...CAUSE YOU CANT PLAY THEM LOUD ENOUGH WITHOUT "PETA" CALLING YOU FOR ANIMAL CRUIALTY !! "Play Responsibly "
Date published: 2014-11-27
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
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Product Q&A

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Dayton Audio IB385-8 15" Infinite Baffle Subwoofer

Is the Dayton IB385-8 a good low pass driver option in an open baffle trio speaker?  My design would use two subs, one at the top of the speaker, one at the bottom, and a dipole driver in the center for high pass. The front baffle would be 72 x 26 inches.

Asked by: Jab84
This woofer will work, but due to the lower sensitivity associated with an open back system they would work best actively crossed with their own amplifier. Having a woofer above the dipole driver may not be very beneficial since there will be very little boundary loading. You would probably get more from them if it was a TMM layout, but you can experiment with this to see the results.
Answered by: MattP
Date published: 2015-02-13

So i was wondering if i used 2 of these woofers in a home theater setup, what would be a good amp to run them both. also they will both be behind my couch in an open back enclosure and would like to know if this would cause and distortion problems?

Asked by: Boomer88
An amplifier that can supply between 500 and 1000 watts RMS will give the best results with these drivers. Keep in mind that if you are using an open-back or "dipole" enclosure (different from an infinite baffle application, where the drivers are mounted directly into a large wall or ceiling) you will likely need some equalization to build up the low end somewhat to compensate for dipole losses, and the demands on the drivers will be much greater when operating in a dipole enclosrue. You can only really expect to get about as much output from these two 15" woofers in a dipole configuration as you would from a single high-performance 10" or 12" subwoofer in a conventional sealed or vented cabinet with 1/2 the amplifier power, so they probably will not shake your room. The reasons for employing a dipole configuration for subwoofers include reduced excitation of room modes and a "boxless" bass character with very little boom or overhang. If you are looking for a powerful level of bass output, I recommend using conventional enclosed subwoofers instead.
Answered by: DaytonAudio_Rory
Date published: 2015-01-23

Hello, I have a pair of Dayton Audio IB385-8 15" Infinite Baffle Subwoofers and my question is I can only mount this in a baffle connecting between rooms on the wall behind me. Will this be a problem with the low Hz's sound coming from behind me?

Asked by: Billy Balls
That should not be a problem. However, make sure the distance from the driver manifold to any doors, windows, or other openings connecting the rooms is as large as possible. You may need to also provide vibration dampening on the frames of any doors between the rooms that will be closed while the subwoofer is operating, to keep them from contributing vibrations, buzzes, or rattles.
Answered by: DaytonAudio_Rory
Date published: 2015-01-23

I have a common chamber enclosures that has 49 conic feet total volume. Looking to install 12 of these infinite baffle subs. Running linear power 1500 watt amp on each set of 4 subs. Needing guidance on choice of sub for said enclosure. Thanks. 

Asked by: INSTALLR
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: 2014-12-26

As this driver was intended for IB applications (where there is no appreciable back pressure), would a pair of these be suitable for use in a push-pull (Isobaric) enclosure?

Asked by: old_bassist
These would be a good choice for an Isobaric design, in a recommended volume of about 3.5 cubic feet. This will provide an F3 of 31 Hz.
Answered by: MattP
Date published: 2015-01-02

Are these suitable for car audio? Have a 87 monte carlo im trying to deck subs behind the back seat.

Asked by: A1lex
Yes these will work in a car application.
Answered by: MattP
Date published: 2014-12-04
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