Infinite Baffle Subwoofer

After reading about Infinite Baffle subs for some time, I was keen to try one. The turning point came when someone wanted some information about the Venom 15inch driver available here in Australia through Jaycar.
I hadn't done any designs for the Venoms because the low Xmax and high-ish Vas didn't augur well for my preferred EBS ported designs. It was then that I looked at doing up some IB designs using 4, 8 or 12 of these drivers.
Room EQ Wizard was used to choose the best location for the manifolds, with the manifold design being a result of advice from The Cult of the Infinitely Baffled

Having awoken my inner bass monster, I felt that I had no choice but to build the twelve driver design. A pair of six-driver manifolds have been built and installed giving around 22 litres displacement. A Behringer EP2500 amp is used to power this bit of extravagance.
Each manifold mounts through the wall - Only the grille is visible
Photo - IB manifold with drivers and grille
Some of the ideas used are:

I'm glad I didn't try to fit these into the ceiling - Each manifold with drivers weighs 75kg (165lbs)


WinISD predictions


SPL graph



Excursion graph


Here is the response at the current seating position using the EP2500 amp

Response graph
BFD Filters


Connection and Calibration

Wiring diagram

Infinite Baffle Gallery

Finished sanding

These look so good it's a shame to hide them in a wall

Photo of raw manifolds


Drivers arrive

Twelve 15inch Venoms.

Photo of driver boxes


Mounting detail

The Venom driver comes with a removable rubber gasket that slips over the driver lip. Adding washers to the mounting screws allows a firm mount without overly crushing the gasket. This shot was taken after the initial tightening with a cordless drill which had a safe setting on the clutch. A cardboard template was made up to mark where to drill the screw holes. The small rebate makes locating the template easier, as well as holding the driver roughly inplace during install.

Photo of driver mounted

Ready to install

One of the two manifolds

Photo of manifold


Front view

There's a fair bit of weight per side....
Manifold 33 kg
Drivers 42 kg
Plinth 8 kg
Grille 2 kg
Total 85 kg or 187 lbs

Photo of front of manifold


Rear view of installation

Photo of rear of installed manifold



Silicone was used to seal and isolate the manifold from the house framing. A spatula was used to get a smooth finish. Sealing two manifolds on both sides of the wall took 10 tubes.

Photo of manifold floated with silicone


The bottom brace was cut to allow the mains to site inside the subs.


Final setup

QRD Diffusers mounted next to the manifolds.

/ib.htm last modified: 31 August 2019
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