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Eminence D-fend SA300 Loudspeaker Protection Unit

Brand:|Model: SA300|Part # 290-683

Blown speakers may soon become extinct due to the creation of Eminence's D-fend SA300 stand alone loudspeaker protection system! If you own or rent out professional audio speakers, you need D-fend!
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Part # 290-683
  • Protects horn drivers, woofers, and subwoofers from being blown
  • Fully programmable to your exact specifications
  • Rated for up to 4,000 watts of power
  • Doesn't affect your speaker's tone or musicality
  • Operates off of speaker power

Product Details

Eminence D-fend SA300 Loudspeaker Protection Unit

Eminence's D-fend™ SA300 is the loudspeaker industry's first all-digital, programmable loudspeaker protection and attenuation system that is specifically designed to solve problems associated with overpowering speakers.

With the Eminence D-fend loudspeaker protection system, there are no more worries about blown speakers and subwoofers, HF drivers, or crossovers. 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. A built-in USB port connects to your laptop or desktop PC for programming D-fend's parameters to your specifications. 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. D-fend's power handling is rated at 4,000 watts @ 8 ohms, 2,000 watts @ 4 ohms, and 1,250 watts @ 2 ohms. D-fend is ideal for:


Word of mouth can be an installer’s best friend or worst enemy. D-fend will not only protect your carefully installed equipment, but also gives you peace of mind knowing your reputation is protected as well.

Equipment Rental CompaniesRental Companies

By using D-fend you can rent out your speakers and know that you’ll get them back in the same condition they left. So what comes in on Monday can go back out the door again on Tuesday.

End UsersEnd Users

Own some passive speakers? Chances are you’ve come closer than you think to blowing a driver. There’s nothing worse than stopping a show in progress because you just lost your subwoofer.


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 Handling

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.


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 D-fend. The SA300 is designed for use with transistorized amplifiers with a low-impedance output.


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.

Eminence D-fend SA300 Loudspeaker Protection Unit
  • BrandEminence Speaker
  • ModelSA300
  • Part Number290-683
  • UPC876358002306
  • Product CategorySpeaker Protection Devices
  • Unit of MeasureEA
  • Product Rating
    (1 Reviews)
  • Weight3.1 lbs.
  • California Prop 65

    Warning: California residents only. Please note per Proposition 65 that this product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

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Eminence D-fend SA300 Loudspeaker Protection Unit

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