A fundamentally new approach to low frequency reproduction, the ELF™ employs electronic compensation to the uniform response that a sealed box loudspeaker system exhibits below its resonance frequency. The resultant frequency response can be extended well below the audible range while at the same time greatly reducing the influence of the system resonance. An ELF™ system reproduces each note with precision and uniformity while maintaining a flat frequency and phase response, eliminating the tendency to emphasize the notes around resonance as in conventional bass systems. The patented ELF™ dual integrator provides both a very flat response below resonance and the high frequency roll-off above resonance, for crossover to the midrange driver, without the use of conventional low pass filters and the delay typically introduced by them. An inherent bonus of the process requires the enclosures to be small. For example, a double 10-inch ELF™ system measures only 13" x 22" x 13" (1.5 cu.ft.).

Follow the link below to download our 15 page Guide to ELF Sysytems, ver 1.3. For consultants, system designers, and anyone interested in the state of the art of subwoofers.

Please check to see that you have the Adobe Acrobat Reader ver 3.0 or later.

ELF™ and Concealment™ are trademarks of Long/Wickersham Labs

Legal notices and trademark attributions

Download ELF Guide (343kb)