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Metal Matrix Diaphragm
Derived from the C.M.M.D. material used in Infinity's flagship Cascade series, M.M.D. features a stiff aluminum core, anodized on both sides for increased
strength and rigidity. M.M.D. transducers conduct sound faster than paper,
polypropylene, and Kevlar, pushing unwanted resonances beyond the operating
range of the transducer. M.M.D. drivers deliver crystal-clear, distortion-free
sound from dynamic digital sources, even at high listening levels. The PS38 is
equipped with a front-firing, 8" M.M.D. woofer.
Amplifier: This subwoofer is powered by a 150-watt (RMS) amplifier,
rated at 35Hz - 150Hz with no more than 0.1% THD. The maximum (peak) power
output is 300 watts.
Surround: For a smoother
response and improved durability, the woofer uses a rubber surround.
Bass Ports: There
are two rear-firing bass ports that allow deep bass with high acoustic
efficiency and low distortion.
The subwoofer has a
rotary control on the rear panel for adjusting the level of the bass.
Low-Pass Crossover: The
subwoofer features a continuously variable 50Hz-150Hz low-pass crossover that
determines the highest frequency at which the subwoofer reproduces sounds. The
crossover has a 24dB/octave slope.
Note: The crossover is bypassed when
the "LFE" input is used.
The subwoofer's phase
switch allows you to control the phase of the subwoofer's output relative to the
front speakers. If the bass sounds muddy or unclear, toggling the phase control
can sometimes strengthen the bass "attack."
Auto On/Off Circuit: The auto on/off circuit turns the power amp on when a signal is sensed and
turns the amplifier off and into standby mode approximately 10 minutes after a
signal is no longer received. An LED indicator on the rear panel glows green
when the amplifier is on and red when the amp is in standby.
Inputs: The subwoofer
has a gold-plated LFE input (single RCA) and gold-plated stereo RCA inputs. If you have a
Dolby Digital/DTS receiver or processor with a low-frequency-effects (LFE)
output, you should use the LFE input on the subwoofer. If your
receiver/processor does not contain a Dolby Digital or DTS processor but has a
subwoofer output, you must use the stereo RCA inputs. If the receiver/processor
has a mono subwoofer output, a "Y" adapter is recommended to maximize