Designed to solve the age-old problems associated with protecting loudspeakers from excessive power conditions,

D-fendtm has eliminated the headaches for speaker engineers - no more hassling with polyswitches, blown lamp filaments, lossy resistors, or slow relays.

 

Evenstar has once again raised the bar within the audio industry by developing and patenting a unique loudspeaker protection & attenuation device that allows maximum driver performance while ensuring damage free operation. Continuing in the successful evolution of their electronic technology, Evenstar has pushed the limits of modern technology and achieved unparalleled performance in speaker protection with the implementation of these unique features.

 

Digital Signal Processing With on-board digital filtering, D-fend provides multiple frequency dependant thresholds and independent attack/release timing parameters. This enables the designer to use D-fend technology prior to passive filtration, and allows increased sensitivity in specific frequency bands such as woofer over-excursion bands or high frequency peak damage regions.
 

 




Joel Butler, Director of Engineering and Electronics at Evenstar, walks us through the concepts behind the invention of this unique technology in this introductory video, and offers five key demonstrations:
 


Evenstar has granted Eminence Speaker LLC the exclusive license for the use of the D-fend Circuit  in all pro audio and musical instrument applications.  For Sub-Licensing contact;


 
Eminence Speaker LLC
502 845 5622
dfend@eminence.com


 

 


 

D-FEND ENERGY DAMPING SPEAKER PROTECTION CIRCUIT
Joel Butler, Director of Engineering and Electronics at Evenstar/D-fend, walks us through the concepts behind the invention of this unique technology in this introductory video, and offers five key demonstrations:
 
Demo #1: Pink Noise
Demo #2: Reverse Sweep
Demo #3: Speed
Demo #4: Fidelity
Demo #5: Excessive Power

 

Digital Attenuation Significantly reduced heat, no bulbs, no light output

Fully Programmable On board microprocessor allows user customizable attack, release, and threshold to maximize loudspeaker performance and minimize SKUs

High Power Capable of protecting high power woofers and sub-woofers from over power conditions as well as mechanical damage thresholds, an achievement unseen within the audio industry

High Speed Extremely fast, capable of protecting the most sensitive high frequency drivers

Versatile MOSFET construction allows easy device voltage & current selection allowing operation with woofers, tweeters, or midrange devices. Under certain circumstances, D-fend may also be utilized as a continuous attenuator.

Customizable Monitors both voltage & current under algorithmic control allowing a diversity of customizable implementations such as adaptive thresholds & attack times, temperature dependant protection, and real time impedance and power delivery measurements

No Aux Power Operates from a standard speaker-level signal, does not require auxiliary power!

Cost Affordable solution allowing various implementations for cost sensitive applications

Musical Attenuation slewing algorithms provide lamp-like musicality without the nuisance of light and flammability concerns. Think of it as a high power, speaker-level compressor/limiter allowing the designer to guarantee unmatched levels of protection for their unpowered  loudspeaker solutions. The following plot illustrates how D-fend can be programmed to match a loudspeakers power handling characteristics including both response time and required attenuation levels.
 
Think of D-fend as a high power, speaker-level compressor/limiter allowing the designer to guarantee unmatched levels of protection for their unpowered loudspeaker solutions. The plots below illustrate how D-fend can be programmed to match a loudspeaker's power handling characteristics including both response time and required attenuation levels.
 



LOUDSPEAKER PROTECTION COMPARISON PLOTS
CLICK FOR LARGE IMAGE


 

 

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