Eminence D-Fend SA300 300 Volt Stand-Alone Loudspeaker Protection Unit

With D-fend there are no more worries about blown speakers, HF drivers or crossovers. Or even worse: fire caused by excessive heat. Not only does D-fend keep your system safe, but your venue and audience as well. The user simply sets the thresholds and D-fend monitors and limits the amount of input power it passes through to the loudspeaker. It’s USB compatible, and can be programmed to your specifications from a desktop or laptop. Just set it and forget it. Protect your products, venue, customers, and your reputation with the first passive speaker protection system that is virtually indestructible.
Digital Signal Processing:With on-board digital filtering, D-fend provides multiple frequency dependent thresholds and independent attack/release timing parameters. This enables the user to employ 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 settings to maximize loudspeaker performance.
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.
Versatile:Allows damage-free operation of woofers, tweeters, and/or midrange devices. Any combination of parallel, series, or parallel-series connected speaker systems can be used on the output of the SA300. The SA300 is designed for use with transistorized amplifiers with a low-impedance output.
No Auxiliary Power:Operates from a standard speaker-level signal, does not require auxiliary power except for low-power applications. External power supply sold separately.
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 limiter allowing the user to guarantee unmatched levels of protection for their unpowered loudspeaker solutions.