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.
A restocked/refurbished, or Open Box unit of the product is available -- see it now
  • 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
    (12 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 4.9167 out of 5 by 12.
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
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

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Dayton Audio IB385-8 15" Infinite Baffle Subwoofer

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: 2014-12-11

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

Im considering using this sub with the Dayton 8" point source in an open baffle. Im using a solid state amp supplying 45 watts rms to each 8" and 100 watts rms to each sub. My listening area is 225sqf. Will I loose much potential with the lack of power?

Asked by: Salbreth1
Your maximum output will be limited, but 100 watts on the woofers and 45 watts on a (high passed) full range will go pretty far. There is no way of knowing if it will be enough until you get everything up and running.
Answered by: MattP
Date published: 2014-11-05

I know this is intended as IB but it seems to model pretty nicely in a ported enclosure of about 500 liters tuned to 16Hz (believe it or not that box size is not a problem in this application). Is there any reason that such an approach would not work?

Asked by: Tubie Th Tubie
The simple answer is yes, there are many reasons to not use this in a ported enclosure. To give you a good, general (and overly simplified) understanding of woofer construction and where each works best, think of it a bit like a range. Most woofers fall in the middle of this range and are a good compromise for either a sealed or ported configuration. But, some are a bit more specialized and have certain design characteristics that really lend them more towards one end of the scale or the other. As you move from the middle in one direction, you come to drivers that absolutely work better in a ported box. If you kept going in that direction, you'd get to woofers at one extreme of the scale, that absolutely need a horn-loaded application. Going back to the middle again, and continuing, you get to woofers that absolutely need a sealed box to work correctly. If you kept going in that direction, you'd eventually get to the opposite extreme on this scale and that's woofers that need an open baffle! An "infinite baffle" is a highly specialized type of open baffle woofer, with specific attributes that make it work it's best in this type arrangement. In short, you're talking about using a woofer with the exact opposite design features of a woofer designed for a ported box. You couldn't hardly get any further from what you want in a woofer for a ported box! There are many very simple "modelling" programs out there that will fool you into thinking that the wrong kind of woofer might work in the wrong kind of situation. This is because they are programed as a guide to give you a starting point for your enclosure, based on the assumption that you have started in the right ballpark. IF you start with something that is all wrong, then you will get goofy predictions because these simplistic programs leave out tons of factors that would reveal why an IB woofer won't do well in a ported box and a horn needs a certain type of driver and the compromises involved in the drivers that are somewhere in the "happy middle." Do some reading sometime on driver theory and construction. Don't be surprised if your head starts hurting really fast! haha! If you want to make your life easier, though, just go with the established guidelines and you'll be a lot closer. For a ported alignment, look for a woofer with a Qts of around .3, a Fs fairly close to where you want your F3 to be and an EBP right around 100. EBP is what you get if you divide your Fs by your Qes. If you are in love with this driver--and what's not to love, right?--then try building a "sealed aperiodic" box for it. I've descibed such a thing in an answer below. A purely aperiodic alignment is designed to "leak" in a controlled fashion and, as such, give a woofer designed for a sealed box what it wants (in a way), at the expense of the deepest bass. BUT WAIT!!! If the way it "leaks" is controlled even further, such that it has somewhere to go OTHER than outside the box (aka, into another box), then the deep notes are preserved! Even better, you need to keep in mind that bass does not function like mids and treble. From about 200 Hz up, speakers play INTO a room. From there down, the room is functionally PART of the speaker and so the speaker plays as a PART OF the room; they are inseparable! What does this mean? I'm glad you asked! It means that if you design a subwoofer to have a flat response in a theoretically anechoic environment (which is nothing like where you live), in an actual room it will boom and be exaggerated at certain frequencies. BUT, if you design a sub for the room it is to play in, then you can take advantage of things like room gain and you'll understand how to get your 15 Hz subsonics, without using things like ports; which are tricky business and seldom work the way you thought they would! A sealed aperiodic design is far more predicable and smoother. NOT TO MENTION, it lets you play with this woofer, which you seem to be fond of. I understand. It's a great one! The design I describe below is 332 liters. If you really want a bigger box--for whatever reason--then use two IB's in an opposed alignment, utilizing a double-sized sealed aperiodic. Beyond giving you more output, it will GREATLY increase the cleanliness of the bass and vastly reduce the vibration of the system. By the way, you will probably never see a correctly designed ported system that realistically goes down to 15 Hz at any good volume, that would be practical to play inside your home. This is because such a port would need to be about 14 to 18" internally and at least 56" long. Anytime you model a speaker and the numbers indicate that the port will be less than three times the diameter, then you know something is wrong and it's not going to work out. This woofer models to the extreme of this and wants a port that is @150 times too short! This is because it needs such a large box, that the port length shrinks to something ridiculous like 1/3", while being 16" wide! It may work out on paper, but that's only because of over simplified models that use just ratios and formulas to determine dimensions, not true models. A true model would show you in an instant that the required port would have currents that collapse upon themselves and never establish the required resonance! It gets far too complicated to try to explain here. Anyway... I gave you a place to start. Let me know how it goes!
Answered by: mainland
Date published: 2014-10-10

is this sub available as 4 or 2 ohm?

Asked by: dapom
Currently this speaker is only available in 8 ohms.
Answered by: TomI
Date published: 2014-10-02

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

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