Dayton Audio PSS545HE-4 Vortex 21" Professional Subwoofer with 5" Voice Coil 4 OhmThe power to move you
You need to move a lot of air for high SPL bass response, and Dayton Audio's PSS545HE-4 21" Vortex professional subwoofer surpasses most high efficiency subwoofers in the industry. This massive driver is capable of 21 mm of excursion in each direction (@ 70% BL, Klippel verified) giving it 7 liters of displacement with each stroke. Displacement isn't all you need for maximum output; power handling and efficiency are also necessary. Capable of handling 2,000 watts RMS and with over 97dB sensitivity, the PSS545HE-4 has what it takes to deliver deep bass at ground shaking output levels. Beware of the power of the Vortex.
Over-Excursion Protection system avoids catastrophic failure
Although the Dayton Audio PSS545HE-4 21" is designed to produce incredibly low frequencies at phenomenal output for extended periods of time, we understand that subwoofers are frequently driven up to and beyond their published limits and we expect that this driver will be no exception. All too often subwoofers fail prematurely due to being over driven, so to minimize this from happening and to extend its life Dayton Audio implemented an OEP (Over-Excursion Protection) system which audibly alerts the user just before catastrophic failure occurs. The Dayton Audio's PSS545HE-4 is purposely built to provide years of the powerful bass you crave.
It's all about the motor
Powering the Dayton Audio PSS545HE-4 is an advanced high energy double stacked ferrite motor assembly. Unlike neodymium magnets, the powerful ferrite magnets are capable of delivering a constant motor force even when exposed to high heat to keep power compression at a minimum. Its 5" inside/outside wound voice coil uses a fiberglass former that can withstand extreme temperatures to handle up to 2,000 watts RMS without issue. A large pole piece vent, 6 peripheral gap vents, and numerous vents between the frame and top plate allow plenty of air to move across the voice coil, further reducing power compression caused by increased resistance due to heat. To control inductance at high output and minimize distortion, the pole piece also includes a large aluminum shorting sleeve. All of this gives the PSS545HE-4 the ability to deliver predictable and consistent low frequency output even when driven to extreme SPL levels for extended periods.
Rugged, durable, and built to handle abuse
Dayton Audio built the PSS545HE-4 to take the use and abuse of the harsh professional sound environment. The naturally damped treated paper cone is optimized and reinforced to handle the stress of exceptionally high excursion while maintaining its shape. To keep the cone under control, the PSS545HE-4 uses dual large diameter spiders with ample spacing to provide extreme linearity. A deep quadruple-roll accordion surround allows for linear excursion, even when driven to its limits and beyond. Holding everything together is a rugged cast aluminum frame that that will not restrict airflow and includes integrated push button wire terminals for a reliable and secure electrical connection. The PSS545HE-4 has been built to deliver years of worry-free performance.
The Vortex is sure to blow you away
If you're looking for one of the highest bass output drivers in the industry, the Dayton Audio PSS545HE-4 is an unbeatable value. This versatile driver is a great choice for vented designs, back loaded horns, and even tapped horns. With a 4 ohm voice coil this driver is also perfect for use in dual and quad driver systems for the ultimate in output capability.
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Dayton Audio PSS545HE-4 Graphs/FRD/ZMA Data File 
Dayton Audio PSS545HE-4 Specifications 
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