The next challenge: Isolating the low-frequency (LF) energy produced by the subs from the platform. Without proper isolation, the entire space under the platform could tend to act as a “resonation chamber” causing uneven frequency response and feedback.

Working with a Mark McLernon, a skilled carpenter from the church, we constructed an isolation solution, a two-chamber box that effectively isolates the low frequency energy from the platform.

The dual design of the chamber was necessary to isolate the subwoofers from the platform extension, and then to isolate the extension from the existing platform.

The subwoofer “inner chamber” is constructed of wood and fastened tightly together with glue and screws to prevent rattles and buzzes. All seams are caulked air-tight, furthering isolation properties.

The “outer chamber” – built within the airspace between the inner chamber and the platform - is isolated from the platform by using wood and concrete board.

After the two chambers were completed and the subwoofers installed, the space between the inner and outer chambers was hard-packed with insulation to add further damping. The top of the box was then sealed with two layers of plywood.

This approach worked out very well, with the end result as predicted – flat and very smooth low frequency presentation, and the desired full-range overall output that keeps up with the high impact (pun intended) of the church’s youth services.

See my Photo Gallery Tour of this project.

Jeff Lange began his audio/musical career attending Musicians Institute in Hollywood, where he developed his passion to play guitar and write music. This developed into an audio career where Jeff has carved out nearly 15 years of professional experience working with commercial audio/visual system design, project management, system installation, project estimating and training.

With a desire to preserve an atmosphere that the word and Spirit of God can minister, Jeff has developed a training seminar that incorporates fundamental concepts that equip the “sound person” to become more effective in their role.

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