PSB SubSeries: The PSB SubSeries 300 powered subwoofer is
designed to provide the flattest possible frequency response, full bass extension,
low distortion, and high output. The PSB SubSeries powered subwoofer is perfect
for music and movie soundtracks.
Class D Discrete MOSFET Amp (from NAD): The PSB SubSeries 300
powered subwoofer employs a custom-designed Class D discrete MOSFET amplifier from
NAD. The integrated digital amplifier from NAD features an automatic varying
switching frequency that maintains maximum efficiency and low THD under all
conditions. The Class D amplifier also incorporates proprietary limiting circuitry
preventing audible overload while remaining true to the dynamics of your music
or movie sound track. This circuitry combines peak limiting circuits that hold
amplifier signal swing to the point just short of the amplifier's clipping, with
compression circuitry that will reduce the amplifier's gain.
12" Woofer: To compliment the powerful Class D amplifier,
the SubSeries 300 uses a 12" polypropylene cone woofer with rubber surround,
1.5" voice coil, and 35oz magnet. The PSB woofer is designed to reduce
mechanical noise and prevent harsh sounds at extreme excursion.
Bass-Reflex Cabinet: The PSB SubSeries 300 powered subwoofer
features a bass-reflex cabinet with a down-firing port for greater efficiency and
bass response. The down-firing port has a large radius end that flare to reduce
noise from air turbulence.
Front-Mounted Controls: Two rotary control knobs (volume/crossover)
and phase switch are provided on the front of the subwoofer for added convenience.
The front-mounted controls are hidden behind detachable grille.
Volume Control: The rotary volume knob controls the output
level of the powered subwoofer, relative to the volume of the other speakers in
Low-Pass Crossover: The low-pass crossover adjusts the high-frequency
roll-off of signals sent to the subwoofer. The control is continuously variable from 50 Hz
to 150 Hz, and allows you to precisely match the subwoofer's bass production with your
system's main left & right stereo speakers.
Phase Switch: The phase switch allows for the adjustment of the
phase of the subwoofer in relation to the speakers used in the system; either 0 or
Auto On/Off: The powered subwoofer features a main power switch
on the back panel. When switched to On, the subwoofer is initially in stand-by mode,
awaiting the presence of an audio signal. When the signal is received, the subwoofer
turns on automatically. When no signal is detected, the sub's amp will automatically
turn off after approximately 15 minutes. In the Off position, the subwoofer will not
power up. A green LED, located on the front panel between the control knobs, will
glow when the subwoofer is active (it will glow red when off).
LFE Input/Output: A single gold-plated RCA jack (LFE) is
provided for connecting the powered subwoofer to your AV receiver's LFE output.
Since the subwoofer/LFE outputs are filtered by most receivers/processors, the
subwoofer's variable low-pass filter is not required and is bypassed. The powered
subwoofer also has an LFE output for adding additional subwoofers.
Stereo RCA Inputs: Two gold-plated RCA jacks are provided for
connecting your source unit via the low-level input. If your receiver or integrated
amplifier has preamp outputs, or if you are using a preamplifier without a designated
subwoofer/LFE output, the preferred connection is to use a stereo RCA cable plugged
into both left and right inputs. If the preamp outputs are unfiltered, the subwoofer's
internal crossover should be used.
Stereo RCA Outputs: The sub also has gold-plated RCA low-level
output jacks, useful if your amp has pre-out/main-in jacks, or when using a separate
preamp and amplifier. The low-level output is internally processed by the sub's active
crossover; the high-pass slope is 12dB/octave and the crossover point is fixed at 80Hz.
Speaker-Level Input: Two pairs of 5-way binding post terminals
(for left and right channel) are provided for connecting the powered sub with speaker
wire. The terminals will accept bare wire, spade lugs, pin connectors, and single or
dual banana plugs.
Power Cord: The subwoofer has a removable 8' power cord with
an IEC 2-pronged connector. This allows you to use a third-party IEC-type power
cord, if desired.