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Dayton Audio IB385-8 15" Infinite Baffle Subwoofer

Brand:|Model: IB385-8|Part # 295-455
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.
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Part # 295-455
  • 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

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
    (15 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.

View similar products to the Dayton Audio IB385-8 15" Infinite Baffle Subwoofer
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Dayton Audio IB385-8 15" Infinite Baffle Subwoofer
Dayton Audio IB385-8 15" Infinite Baffle Subwoofer is rated 4.9333 out of 5 by 15.
Rated 5 out of 5 by from great for ht or musicI have four of these in an IB configuration in a 6000 cuft room grouped in two pairs firing into the room through a 18 x 11 inch opening for each pair. The sound is very smooth and detailed at most volumes, it is a little boomy at very low volumes. I have 1000 watts going to each pair and It could use even more power. These drivers give all the bottom end you could ever ask for and the response extends well below audible range. The bass is best described as effortless, even at insane levels it sounds as if can go much louder and much deeper. Not sure why these are on Clearance now especially since the clearance price is $15 more than I paid for mine. I hope PE will bring out an entire line of infinite baffle drivers in different sizes and impedance's.
Date published: 2015-12-09
Rated 5 out of 5 by from Deep and clean bass.I initially bought 1 sub and the 500 watt Dayton plate amp (on sale). Not enough power into 8 Ohms (250 w). Bought a 2nd sub to make 4 ohm load. Much better. (I may still spring for the 1000 watt amp). Very clean and deep bass through a 2 sub manifold in a 100 cubic ft space under the stairs. Just kept getting better as they broke in. No adjustment needed on the amp controls. The subs are a great bargain and visitors are impressed with the IBS manifold setup. Easy to build manifold with an old speaker box with the end cut off and another 15" hole cut in the back.
Date published: 2015-08-01
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
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Product Q&A

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Dayton Audio IB385-8 15" Infinite Baffle Subwoofer

All external variables aside, if this was put into a simple, strong, well-damped 19.39 cu ft (PE stated spec) bass reflex enclosure tuned to the f3 15 hz resonance, what would be your expected results in open space at 230watts?

Asked by: john e h
This is more of an IB driver but that should do fine in a open room,. The ported alignment will bring out the bottom end a little more than using it in an Infinite baffle setup.
Answered by: Chrisf
Date published: 2016-02-05

If this was put into a simple strong well damped 19.66 cu ft (PE stated spec) bass reflex enclosure tuned to f3 20 hz resonance, what would be your expected results?

Asked by: john e h

Are there any issues with "remoting" the plate amp, placing it in the media room below, and running the speaker wires to the two IB385-8 15s placed in the infinite baffle setup in the ceiling?  That would be much easier to "tune" it.

Asked by: treetech
There is nothing wrong with wiring a setup like this.
Answered by: MattP
Date published: 2016-01-20

On the IB 385-8 15, if I bought two, mounted them opposite in an 18" 5 sided cube, hooked them to a 1000 watt amp, and pointed the open end into my media room (1764 cu ft) from the front wall ceiling, I'd be on track?  Lou

Asked by: treetech
That would be a suitable layout for a pair of these woofers.
Answered by: MattP
Date published: 2016-01-18

Would two of these in-wall mounted 6 ft. apart as an IB setup with an extra large attic space behind them, powered by a Crown XLS 2500, give any sub-20Hz performance? Or would a single UM18-22 be a better choice (powered by a bridged Crown XLS2000)? Thank

Asked by: MJEJ
Both choices will have similar displacement although the dual 15's would have to work less for it, meaning lower distortion. These should be able to reproduce 20 Hz but it really depends on room size and the output you want.
Answered by: MattP
Date published: 2015-12-28

what size manifold opening (square inches) would be most appropriate for a 2 driver IB configuration?  how about for a 4 driver configuration?  and what would you recommend as the best material to cover the manifold opening with?

Asked by: agim
~300 square inches will work fine for two or four of these. An 18" five sided cube would be perfect for either quantity. We have different grill fabric options that would work to cover the opening.
Answered by: MattP
Date published: 2015-12-21
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