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 *
  • Sealed Volume8.61 ft.³
  • Sealed F330 Hz
  • Vented Volume19.39 ft.³
  • Vented F315 Hz
  • * Enclosure volume/F3s based on BassBox "optimum" calculations-
Dayton Audio IB385-8 15" Infinite Baffle Subwoofer
  • BrandDayton Audio
  • ModelIB385-8
  • Part Number295-455
  • UPC844632000102
  • Product CategorySubwoofer Drivers
  • Unit of MeasureEA
  • Product Rating
    (10 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 4.9 out of 5 by 10.
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: 2014-01-07
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: 2014-01-07
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: 2014-01-30
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: 2014-01-01
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: 2012-03-13
Rated 5 out of 5 by from Awesome for dipole subwoofersUsing 2 of these as dipole-subwoofers, and the sound is nothing short of amazing.
Date published: 2014-01-30

Product Q&A

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If your question requires design or troubleshooting information,
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Dayton Audio IB385-8 15" Infinite Baffle Subwoofer

Looking for a similar driver more power handling more output too

Well I have been using this woofer 295-455. and has severed well for several years, but I would like something similar, maybe even in an 18" and still would like to stay an 8 ohm driver.Anything you can recommend to me?I also need something similar in terms of power, and even if it is a little more power hungry and can handle more power that is fine too.I have a Parasound mono bridged amp that is 750 watts at 8 ohm and 1000 at 4 ohms., Prefer to stay on 8.I think I have noticed lately that the woofer seems to start bottoming the voice coil at lesser power loads recently. Driver does not seem blown, no tares etc, but you can her the speaker pop lightly when loaded heavy, and it never did that before.
Asked by: djwhog
Fi audio makes 12, 15 and 18in subwoofers specifically intended for IB use. Alas, they are only available with 2ohm or 4ohm voice coils. If you can deal with the 4ohm load, the Fi drivers should handle significantly more power and excursion than these for marginally more money: $189 for the 12, $209 for the 15 or $239 for the 18. Fi will even *service them* should they fail, for something around half what they cost new. I've yet to hear their wares, but investigated them some months ago, and was impressed with the people who answered my questions.
Answered by: Eric M
Date published: 2014-01-08

what does infinite baffle mean?

Asked by: Bigs
An infinite baffle is the use of a driver on a baffle with the enclosure being whatever the back of the deiver is enclosed in. For instance some woofers are mounted on wood boards and then mounted with the front facing into the listening are and the rear facing say the attic. The attic will act as the enclosure. The most important thing in and IB install is to keep the front and rear waves of the subwoofer isolated from one another. There should be 100% separation.
Answered by: paragv
Date published: 2012-07-14

is this for in wall use or for general ib purposes?

hey now.if i just used one of these woofers, in a regular "L" framed stand would it be good for ht use or am i better off with a sealed and eq'd (my preference in sub enclosures, if i go that route it would have to be a 10" sub)thanks in advance
Asked by: skinnyD
The larger the baffle, the lower in frequency you can go before the back wave wraps around and cancels the front wave. That's just general acoustics, not specific to this particular driver. Since this driver is designed for infinite baffle use, it is happy without a box behind it to serve as an acoustic load, so it can work in an open baffle, infinite baffle, or dipole.You can get low bass from a smallish baffle with lots of equalization, but it won't go as loud before the driver starts to exceed its mechanical and electrical limits. This driver seems to be pretty good at large cone excursions without too much distortion, which is what you need in order to play the equalization trick. Before I mounted mine, I tried driving it pretty hard at low frequencies in open air. It held up quite well, without any buzzing or overtones, up to the point where something started rattling (at the excursion limit point).If you want to go the open baffle plus equalization route, the maximum volume will be less than what you could get from an infinite baffle. But, depending on the size of your room, where you place the speaker, and how loud you want it to be, it might very well be enough.
Answered by: Maui Speaker Builder
Date published: 2013-06-10

is this a good sub for down firing applications?

Asked by: a4tune81
This driver will probably "work" in a down-firing application, but it is not what it is made for. The ideal situation for this driver would be to mount it in a ceiling or a floor firing into the room. Typically these sorts of installs call for multiple woofers as well. If you want to do a down firing sub, I would suggest the DVC series sub from Dayton staying in the same price range.
Answered by: Musgofasa
Date published: 2012-11-12

I will be using two of these in an infinite baffle for home theater.

They will be front firing on both sides of t.v. I will also be purchasing the Bic FH-6 in wall front speakers. Is there a problem with them all sharing the same "space"?
Asked by: sem613
These will not interfere with the other in wall speakers in the same way an enclosued speaker would.
Answered by: MattP
Date published: 2012-12-29

Does it matter if you use a 4 or 8 ohm powered subwoofer for a home AVR.

Asked by: spunck
If it is a powered subwoofer, the woofer impedance makes no difference for the AVR.
Answered by: MattP
Date published: 2013-02-11

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