Passive Radiator Design: The ProSub 800 features a 300-watt (RMS) amplifier driving a
high-excursion 8-inch front-mounted direct-radiating woofer that is
pressure-coupled to an 8-inch low-bass passive radiator on the bottom of the
enclosure. The net radiating area of the ProSub 800 is 27% greater than a single
10 inch woofer but with better speed, pitch definition, and control.
PowerField Technology Amplifier:
The ProSub 800 incorporates Definitive's
proprietary PowerField technology, by which the amplifier is specifically
engineered in conjunction with the driver for optimum load matching and power
transfer characteristics. The Definitive ProSub 800 powered subwoofer incorporates a unique, patented,
digitally-coupled infinite power source amplifier with a high-current direct
coupled power supply 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.
High-Definition Subwoofer: The powerful, high-definition 8"
polymer subwoofer driver is specifically engineered by Definitive Technology to deliver rock-solid low distortion bass, reaching down
to the lowest subsonic frequencies (20-150Hz), with superior
transient response. The special ultra-stiff, low-mass cone (for super-fast
transient response) is joined to a specially formulated surround and long-throw
voice coil and spider. The ultra-rigid basket is engineered to hold the woofer's
massive magnet structure and large voice coil in absolute alignment. The high
temperature voice coil is made of aluminum wound with triple insulated
ultra-pure copper wire and baked in epoxy for increased power handling.
Non-Resonant Cabinet: 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. The Definitive Technology ProSub 800 powered
subwoofer utilizes a monocoque cabinet, which has been specifically engineered
to be totally inert and vibration free, to ensure you of 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 cabinet,
itself, incorporates multiple internal braces to ensure total solidity.
Protection Circuits: The Definitive Technology ProSub 800 features two protection circuits that ensure
that the subwoofer can never be overdriven.
Integrated/Adjustable Feet: The ProSub 800 features four integrated
feet with rubber tips so you can place it securely and safely on your home's
floor. Each foot's height is adjustable to help you place the powered sub on an
Placement: The Definitive
Technology powered subwoofer has been designed to operate at frequencies
generally below 150 Hz. Because low-frequency information in this range
essentially is non-directional, your subwoofer can be located anywhere in your
listening room that is most convenient. Also the continuously variable low-pass
filter operate at a very fast roll-off, ensuring great performance wherever you
place the subwoofer. There are, however, some general rules that you should bear
in mind when locating the powered sub.
- For maximum output the subwoofer should
be placed in a corner or against the wall.
- Corner placement will increase the
subwoofer's efficiency, which in turn will increase your system's maximum
output and improve the dynamic capability of the subwoofer.
Subwoofer Controls: A complete
array of controls allows the ProSub 800 to be perfectly integrated with any
stereo or multi-channel audio system, and tuned for optimum performance in any
Volume Control: The ProSub 800 features a convenient
front-side-mounted volume control that makes adjustments fast and easy. This 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.
Variable Low-Pass Crossover: The Definitive Technology ProSub 800 powered subwoofer has a continuously adjustable low-pass filter control which allows 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 (24dB/oct) is extremely steep which ensures perfect blending
with your main speakers as well as eliminating unwanted midrange 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 located.
Auto Turn-On Circuit: The powered subwoofer has a special power
circuit which automatically turns the powered subwoofer on when a signal is fed
to the loudspeaker and turns it off when there is no signal present, so it does
not require an on-off switch.
LED Indicator: The red LED on the back panel of the powered subwoofer
will light up when a signal is sensed and the amplifier turns on. It will
automatically turn off with the powered subwoofer, a little while after the
signal is discontinued.
Line-Level & Speaker-Level Connections:
Definitive Technology ProSub 800 powered subwoofer has a complete range of
inputs and outputs to allow easy and effective hookup to any system. The ProSub 800 has a separate direct-in LFE
low-level input. Speaker level inputs are provided in case you do not have a
LFE Input: The
Definitive Technology powered subwoofer has a low-level direct LFE input for
Dolby Digital soundtracks, which bypasses the crossover network. If
you are connecting the subwoofer to an AV receiver without a dedicated
subwoofer or LFE preamp output, but does features a stereo RCA output, you
will need to use a stereo RCA cable along with an RCA Y-adapter.
Note: When using the LFE input with a receiver that has
an internal x-over you should set the x-over on the sub to 150Hz.
Speaker Level In: The Speaker Level inputs (binding
posts) are designed to be used on receivers or amplifiers that do not
incorporate any RCA type subwoofer outputs. If your receiver is equipped
with an RCA type subwoofer outputs, these speaker level inputs should not be
Speaker Level Output:The
ProSub 800 also features speaker level outputs (binding posts), so you can
connect your front (main speakers) through the powered subwoofer. The ProSub
800 has a built-in speaker level high-pass crossover preset at 80 Hz