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BOSTON PV 700 SUBWOOFER ATTIVO
OTTIME CONDIZIONI FUNZIONALI
PRESENTI SEGNI DI UTILIZZO COME IN FOTO
NO IMBALLI E DOCUMENTI
PowerVent (PV): The Boston Acoustics PV700
powered subwoofer features a down firing 12" woofer
in a bass reflex enclosure (ported to the rear). More
than just a speaker in a box, every aspect of a Boston
Acoustics PowerVent subwoofer has been molded to
deliver optimum performance. From the computer-
modeled woofer with DCD to the tuned enclosure with
dual flared vent and extensive bracing to the high-
current amplifier with active equalization, all parts are
designed with the others in mind, working together in
unison to deliver bass with impact and realism.
DCD (Deep Channel Design): The 12-inch driver used in
the PV subwoofers utilizes Boston Acoustics' DCD
design. DCD is a deeply grooved pole plate that
enables the voice coil to travel farther for greater
output without bottoming out. Through the use of an
advanced computer modeling process called Finite
Element Analysis (FEA), efficiency is optimized,
allowing the subwoofer to take full advantage of the
PV's built-in amplifier. Furthermore, every woofer is
tested as it comes off the line to be within ±1dB of the
lab reference unit, an incredibly tight tolerance.
Auto-On Circuit: The PV700 has an Auto-On Circuit
which can automatically turn the amplifier on when an
audio signal is detected. It will automatically turn off
after about 15 minutes with no signal. The LED
indicator on the back of the sub glows green when the
unit is on and red when the unit is off. The switch can
also be set to on, in which case the sub is on with or
without audio input. In addition to the Auto-On/On
switch, there is a master power switch. When the
master switch is off, the sub cannot be turned on.
Volume Control: The rotary volume control is
conveniently located on the front of the subwoofer for
easy balancing with other components in your audio
system.
BASSTRAC: PV series subwoofer amplifiers feature
BassTrac circuitry, a proprietary Boston Acoustics-
designed technology, which tracks the subwoofer's
input signal and prevents the amplifier from being
driven into audible distortion. Unlike conventional
designs, BassTrac does not merely remove the signal
peaks that cause distortion, instead it preserves the
waveform's shape so the fidelity of the signal is
maintained. Even the heaviest bass passages in
movies or audio tracks will sound solid, rich, and full,
without unwanted artifacts.
Phase Switch: The subwoofer's phase switch allows
you to select 0° or 180°. If the bass sounds weak,
muddy, or unclear toggling the phase control may
strengthen the bass attack.
Crossover: The PV700 has a built-in 24dB/octave low-
pass crossover, continuously variable from 50Hz to
150Hz. This adjusts the upper end of the sub's
frequency range. Boston includes a chart of
recommended crossover settings for various Boston
speakers the sub might be paired with.
Rubber Feet: Since the PV700 is downward firing it sits
on four feet about 1 1/4" above the floor. Four adhesive
backed rubber foot pads are included for use on a non
carpeted floor.
Inputs
Line Level Inputs: The PV700 has gold-plated line level
inputs for an LFE (Low Frequency Effects) channel and
for a standard line level signal. The LFE output from a
receiver is already crossed over so the sub's crossover
is bypassed. When the standard line level input is used
the signal is then fed to the PV700's crossover.
Speaker Inputs: This unit has left and right 5-way
binding post speaker level inputs for connecting the
subwoofer to a receiver without a line level subwoofer
output. If bare wire is used, up to 10 gauge will fit
through the post. When the speaker level inputs are
used, the internal crossover cannot be bypassed.
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