PSB SubSeries: The PSB SubSeries 125 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 125 powered subwoofer
employs a custom-designed Class D discrete MOSFET amplifier (125W RMS/320W Peak) 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.
8" Woofer: To compliment the powerful Class D amplifier, the
SubSeries 125 uses a front-firing 8" polypropylene cone woofer with rubber surround, 1.5"
voice coil, and 28oz magnet. The PSB woofer is designed to reduce mechanical
noise and prevent harsh sounds at extreme excursion.
Bass-Reflex Cabinet: The PSB SubSeries 125 powered subwoofer features
a bass-reflex cabinet with a front-firing slot port (1" x 8") for greater
efficiency and bass response.
Front-Mounted Controls: Two rotary control knobs
(volume/crossover) are provided on the front of the subwoofer for added
Volume Control: The rotary volume knob controls the output level of
the powered subwoofer, relative to the volume of the other speakers in the
Low-Pass Crossover: There is an external/internal crossover
switch on the back of the powered sub. If you select the "internal" position,
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. If you
select the "external" position, the powered sub's low-pass crossover is
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 180 degrees.
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
Low Level Input: Two gold-plated RCA jacks are provided for
connecting your receiver via the low-level input. You can use a single RCA cable
to connect the Subwoofer or LFE (low frequency effects) Output from your
receiver, preamplifier, or integrated amp. Either the left or right channel
inputs can be used. Since most subwoofer/LFE outputs are filtered by most
receivers/processors, the subwoofer's variable low-pass filter is usually not
required and should be bypassed. This is done by placing the crossover switch to
the External Crossover (LFE Input) position. 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 and the switch
placed in the "Internal Crossover" position.
Speaker Level In: Two pairs of 5-way binding post terminals
(for left and right channel) are provided for connecting the sub with speaker
wire. The terminals will accept bare wire, spade lugs, pin connectors, and
single or dual banana plugs. The plastic inserts must first be removed from the
terminals before using banana plugs. Speaker wires can also be run from the
subwoofer directly to the main speakers, eliminating the need to run wires from
the receiver or amplifier to the main speakers.
Power Cord: The subwoofer has a removable 6' power cord with
an IEC 2-pronged connector. This allows you to use a third-party IEC-type power
cord, if desired.