The ultimate in bass performance
Definitive's ProSub 800 is an advanced state-of-the-art technology active subwoofer with a built-in high-power, high-current amplifier and sophisticated electronic crossover in combination with an 8" driver of the highest quality. In addition, precisely accurate equalization, combined with a complete array of controls and connections, allows it to be hooked up to any electronics, perfectly integrated with any speaker system, and tuned for optimum performance in any room. The sonic result is accurate, awe-inspiring, high-impact, high-reality bass performance with superior transient response, vanishingly low distortion, stupendous subsonic power and high output capabilities. It is truly a unique combination of delicate musicality and thunderous power for the ultimate in home theater sound effects as well as unsurpassed musical excellence. The extraordinary achievements and performance of Definitive's subwoofers have been honored by numerous prestigious awards and industry accolades.
Infinite Power Source high-current MOSFET power amplifier
All of Definitive's ProSub powered subwoofers incorporate their unique, patented, digitally-coupled Infinite Power Source amplifiers with high-current direct coupled power supplies and discrete MOSFET output devices to ensure perfect high-definition resolution and reproduction of the most dynamic program material and demanding sub-bass transients. Construction quality is absolutely state-of-the-art with only the highest quality components used, including mil-spec glass epoxy circuit boards and precision resistors and capacitors for many years of faultless superior performance. In addition, tremendous current reserves, high peak-power capabilities and two special sonically invisible protection circuits ensure that these subwoofers can never be overdriven. There is also a convenient, signal-sensing, auto on/off feature.
Superior detail and lightning-fast transient response
The powerful, high-definition driver used in the ProSub 800 was specifically designed by Definitive for its task: to deliver rock-solid low distortion bass, reaching down to the lowest subsonic frequencies, with an outstanding quality of superior transient response unequaled in the world. The special ultra-stiff, low-mass cones (for super-fast transient response) are joined to specially formulated surrounds and long-throw voice coils. The incredibly rigid baskets are engineered to hold the massive magnet structures and large voice coils in absolute alignment. The high temperature voice coils are made of aluminum wound with triple insulated ultra-pure copper wire and baked in epoxy for power handling in excess of 750 watts.
Extended response and improved pitch definition
The ProSub 800 powered subwoofer incorporates a unique, highly effective computer synthesized transmission line tuning. Transmission line loading of low-frequency drivers has long been acknowledged among critical audiophiles as producing the deepest, cleanest, and most uncolored bass response. The construction of a true and properly engineered transmission line is, however, an extremely complex and expensive procedure. Definitive's engineers have developed, with the aid of a supercomputer at a major Eastern university, a new bass tuning program which basically duplicates the loading of a transmission line (in terms of extended bass response, ideal transient behavior, and superior pitch definition) in a much more elegant and cost-effective cabinet construction. The drivers' construction, combined with this unique transmission line loading, minimizes required excursion, thus improving transient response as well as ensuring maximum coupling of their output to the air in your room for bass literally powerful enough to shake concrete floors, as reviewers have noted.
Pure low distortion response
The cabinet of a loudspeaker plays a large part in its sonic performance. Resonance and vibration can add unwanted distortion as well as drain away important energy from the system. Definitive's subwoofers utilize monocoque cabinets, which have been specifically engineered to be totally inert and vibration free, to ensure you of absolutely pure sonic reproduction. Monocoque means that the cabinet is of a unitized construction where all panels are permanently joined together into one solid structure. The cabinet walls themselves are high-density medite fused together by space-age polymer adhesives. The front and rear baffles are extra thick and the cabinets each incorporate multiple internal braces to ensure total solidity.
A perfect match to your system and room
The sophisticated low distortion electronic crossovers incorporated in all Definitive powered subwoofers are a masterpiece of design and execution. They contain a complete range of hookups, circuitry, and features which allow the subwoofers to be connected and perfectly blended with any system as well as adjusted for optimum performance in any room. The ProSub 800 powered subwoofer has continuously adjustable low pass filter controls which allow you to choose a roll-off of from 40 to 150 Hz for the high end of the subwoofer. This unique "dual stage" roll-off is extremely quick which ensures perfect blending with your main speakers as well as no unwanted upper bass or midrange radiation from the subwoofer. This is especially important because it gives you much greater flexibility in placing your subwoofer in your room without being able to hear where it is specifically located. The ProSub 800 also has a separate low-level direct LFE input for Dolby Digital which bypasses the crossover network. All models have a built-in speaker level high-pass crossover preset at 80 Hz (except ProSub 60 preset at 100Hz) and, of course, a precision level control allows you to perfectly adjust the volume of the subwoofer to match your system and room as well as to fulfill your own personal sonic preferences.
Easy hookup to any system
The ProSub 800 has a complete range of inputs, outputs and features to allow easy and effective hookup to any system either singly or in a stereo pair. Both (high) speaker level and low-level inputs are provided in case you don't have a subwoofer output. In addition, all models have a separate direct-in LFE low-level input (which bypasses the crossover network) which may be used by itself or in combination with left and right channel high- or low-level inputs for the ultimate in subwoofer flexibility and performance. With a single subwoofer, the subwoofer signal, Dolby Digital LFE signal and/or both left and right signals are sent to the subwoofer and combined via the electronic crossover into one composite signal. With stereo (two) subwoofers, the left and right signals are reproduced by their own respective subwoofer (and the LFE signal is reproduced by both). Very advanced systems may also use a separate subwoofer hooked up to the rear/side surround channels as well as one to the center channel.
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