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D-FEND DIGITALLY FACTORED
ENERGY DAMPING PROTECTION CIRCUIT
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.
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.
 Click
Image for Hi Rez
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 above illustrate how D-fend can be programmed to match a
loudspeaker's power handling characteristics including both response
time and required attenuation levels.
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
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