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Overview: The Niles Audio SWA-500M is a Class D mono subwoofer amplifier that
is designed to drive Niles Passive Subwoofers, such as the SW10WM, SW10JM, and
GSS10. The amp's high-current design can handle even the most demanding
situations, and will work well for both indoor and outdoor speaker systems
(indoor installation is required). It has RCA and binding post inputs and
outputs, and front-mounted controls.
Power Output: The SWA-500M produces 500 watts RMS into 4 ohms with <1%
THD. It has two speaker outputs, allowing you to connect one 4 ohm or two 8 ohm
Inputs: The amp offers multiple ways of inputting a signal. You can
hook up the amp via a line-level connection. Three gold-plated RCA jacks are
provided: left and right RCAs if you're using a stereo input, and an LFE input
if your receiver has an LFE output. You can also input a speaker-level signal by
connecting a stereo output from a receiver to the SWA-500M's gold-plated binding post
Note: The binding posts will accept bare wire, pin connectors,
single- and double-banana connectors. A collar around the binding post
prohibits use of spade lugs.
Speaker Outputs: The amplifier has binding posts for two
subwoofer outputs labeled A and B. If you are connecting only one subwoofer, you
should use the A outputs. If you are adding a second subwoofer, it should be
connected to the B outputs. The two-way toggle switch on the rear panel must be
set to the correct position to reflect the number of subwoofers connected (one
Pass Throughs: The SWA-500M has gold-plated RCA output jacks which can
pass through the line-level signal to another amplifier. The left and right
audio outputs are affected by the unit's high-pass filter settings. The LFE
output signal is not filtered. If you connected the amp via speaker-level input,
you can pass through that amplified signal to a pair of satellite speakers via
the left and right speaker outputs (binding posts), in addition to the subwoofer
outputs. The stereo speaker outputs are not affected by the unit's high-pass
filter, however the subwoofer output is affected by the low-pass filter setting.
Front Controls: The SWA-500M has several rotary controls on the front
panel for setting up the subwoofer's sound. The low-profile rotary controls can
be adjusted by hand or with a large flat-blade screwdriver. The front panel
- Low-Pass: This rotary low-pass control dial sets the subwoofer's
crossover frequency between 40 and 120 Hz. Audio signals below the set frequency
are passed through to the subwoofer speaker. The low-pass filter has a slope
of 12dB per octave. Note: The amplifier has a fixed low-pass filter
at 125 Hz with a 6dB per octave slope.
- Phase: The phase control helps integrate the subwoofer sound into the
entire sound system. You can set the control between 0° and 180°. The
subwoofer's physical placement can affect the output relative to the rest of
the system. Adjusting the phase control can optimize the bass sound.
- High-Pass: The high-pass control consists of a two-position
switch, turning the filter on and off, and a rotary control to set the
frequency cutoff. The control is adjustable between 60 and 160 Hz, and
should be set to the frequency recommended by the satellite speaker
manufacturer. Audio signals above the cutoff frequency are passed through to
the satellite speaker outputs. The high-pass filter has a slope of 12dB per
octave for both the speaker outputs and the stereo line-level outputs.
- Music/Movie Levels: Because bass levels will differ depending on
whether you are watching a movie or listening to music, the amplifier
includes separate level controls. The two-position Setup switch lets you
choose which level control is active during the initial setup (an LED will
indicate the currently selected mode). After setup, you can manually select
the Music or Movie mode, or automatically via an external trigger.
Bass Boost: The SWA-500M has a Bass Boost control on the rear panel
that adds a measure of bass reinforcement at a selectable frequency. You can set
the bass boost frequency at 50Hz, 40Hz, 35Hz, 25Hz, or No Boost. The level of
bass boost is not provided.
Audio Sensing Trigger: The SWA-500M can be set to turn on
automatically when an audio signal is detected on either the line-level or
speaker-level inputs. The rear-mounted (Auto) Power Switch must be set to the
Music/Voltage Sensing position in order to engage the Auto Turn-on Feature. The
unit will automatically enter standby mode 15-20 minutes after losing the audio
12-volt Triggers: The amplifier features two triggers that allow you
to control the power and mode settings remotely. The trigger inputs and outputs
take a 3.5mm mini-plug. The triggers include:
- System Trigger: The System On/Off Trigger lets you turn the
amplifier on or off automatically. When the amp receives a control signal
from a home theater sound processor or receiver, the amplifier turns on
automatically. The input accepts AC or DC controls signals ranging from 3 to
30 volts. When the signal is no longer detected, the amplifier will
automatically turn itself off after a delay of 15-20 minutes. The "Out" jack
will pass the power trigger signal to another amplifier or other
- Movie Mode Trigger: The Movie Mode Trigger can automatically
switch the amplifier mode from Music to Movie when the input receives
voltage (3-30 volts AC or DC). When no signal is detected, the amplifier
remains in the Music mode. The "Out" jack will pass the movie trigger signal
to another SWA-500M amplifier.
Switchable Input Power: The SWA-500M amplifier is compatible with 115
Volts or 230 Volts AC power systems. A switch on the rear panel next to the main
power switch lets you choose the voltage required.
Rack Mountable: The SWA-500M amplifier comes with a pair of rack
mounting ears that can be attached to the sides of the unit. With the rack ears
in place, the amp can be mounted into a standard 19" rack. The amplifier is 2
rack units (2U) in height (3.5") with the feet removed. You must allow adequate
free air space above and behind the unit for proper ventilation.