IB385-8 15" Infinite Baffle Subwoofer

Quick Overview

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 in infinite baffle situations

Product Highlights

• 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
• Vented Pole Piece

Product Manuals / Spec Sheets / Downloads

IB385-8 15" Infinite Baffle Subwoofer

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Product Description

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.


Sealed Volume 8.61 ft.³
Sealed F3 30 Hz
Vented Volume 19.39 ft.³
Vented F3 15 Hz
* Enclosure volume/F3s based on BassBox "optimum" calculations


Speaker Series Specialty Drivers Series
Model Number IB385-8
List Price $207.99
Color Black
Unit of Measure Each
UPC 844632000102
Warranty - Parts 5 Years
Warranty - Labor 5 Years
Product Shipping Weight (lbs.) 20.0000


Speaker Type Subwoofer
Nominal Diameter 15"
Power Handling (RMS) 350 watts
Power Handling (max) 700 watts
Impedance 8 ohms
Sensitivity 88.2 dB @ 1W/1m
Frequency Response 20 - 500 Hz
Voice Coil Diameter 51 mm
Magnet Weight 90 oz.


DC Resistance (Re) 5.2 ohms
Voice Coil Inductance (Le) 3.08 mH
Resonant Frequency (Fs) 21.5 Hz
Mechanical Q (Qms) 8.92
Electromagnetic Q (Qes) 0.63
Total Q (Qts) 0.59
Diaphragm Mass Inc. Airload (Mms) 207.00 g
Mechanical Compliance of Suspension (Cms) 0.26 mm/N
Surface Area Of Cone (Sd) 819.4 cm²
Volume of Displacement (Vd) 1,171.7 cm³
BL Product (BL) 15.46 Tm
Compliance Equivalent Volume (Vas) 248.9 liters
Maximum Linear Excursion (Xmax) 14.3 mm


Cone / Diaphragm Material Paper / Kevlar Cone
Surround Material Foam
Voice Coil Wire Material Copper
Voice Coil Former Kapton® / Polyimide
Dual Voice Coil No
Basket/Frame Material Steel
Magnet Material Ferrite
Shielded No


Overall Outside Diameter 384.94 mm
Overall Depth 161.1 mm
Baffle Cutout Diameter 349.63 mm
# Mounting Holes 8