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500 Watt Subwoofer
Amplifier
Model: DSW-500N
User Manual
Zachry-audio.com
Thank you for purchasing the DSW-500N Subwoofer Amplifier. It has been designed and built to provide years of
high quality sound reproduction, and is ideal for use in both home stereo and home theatre systems. The
amplifier has been engineered to include features like a choice of high or low level audio connections selectable
crossover frequency, comprehensive internal production against shorted speaker loads, thermal faults, and
overload conditions.
Features:
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RCA and balanced level inputs for connection to any system
Full frequency balanced level outputs
Soft-clip circuitry provides clean output even with demanding program material
Full complement of protection circuits for extreme reliability
Reverse phase switch for best integration with satellites
Bypass gives fully frequency to the inbuilt amplifier
Switchable stereo-mono, HPF- LPF- and subsonic filters
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Variable frequency 4 order low-pass crossover for a clean transition to main speakers
Advanced soft clip circuitry improves headroom and protect connected speakers
Switchable 115/230V input voltage
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1.) Low-Level inputs (Left/Right)
RCA- and balanced XLR style jacks what will accept standard line level inputs from a pre-amp level source. They
will accept a stereo signal and internally combine it into mono. Both left and right input jacks must be
connected to the source in order to drive the amplifier to full output.
2.) Low-Level outputs (Left/Right)
This balanced XLR output allows the low level input signal to be daisy chained through the internal preamps to
other amplifiers or powered satellites with no alternation (EQ) to the original signal.
3.) Level
This control will match the amplifier’s input sensitivity to the output of the pre-amp source. If the source has a
variable control, we recommend that the user spend a moment or two determining the best balance between
the two controls. When a balance is found between low noise, linear level control, and sufficient level to drive
the amp to the required output, the level knob can be considered to be the “volume control” for the
subwoofer or full range system.
4.) Bypass
This two position (ON or OFF) switch gives in ON mode full frequency to the amp which can be used as a full
range amplifier (subsonic- and phase switch can still be used).
In OFF mode will the signal supply the sweep control and the amp is suitable for subwoofer system.
5.) HPF
This two position (ON or OFF) switch gives in ON mode a slight decreasing of the treble from approx 200 Hz and
up (only in bypass ON mode).
6.) Sweep
This control works only in bypass OFF mode and is used to establish the highest frequency that the subwoofer
will reproduce and has a range between 30 to 200Hz with slop of 24 dB per octave. If you are using the system
for music and your main speakers have good bass capability, you could set the control to a fairly low value at
40, 60, or even 100 Hz. If the main speakers are smaller or do not have much bass output, set the control
higher. Experiment with the amount of “overlap” that you experience when all speakers are playing in the
same range. This can be helpful when integrating the subwoofer with the rest of the system and with the room.
7.) LPF
This two position (ON or OFF) switch gives in ON mode a slight decreasing of the bass from approx 40 Hz and
down. It is useful to remove the extremely low disturbing frequencies (only in bypass ON mode).
8.) Phase
This two position (NOR = 0° and REV = 180° phase) switch helps to compensate for different in the acoustical
and electrical characteristics between the subwoofer or full range system and the main system speakers. The
relative locations of speaker in the system can cause significant disturbances in speaker in the system due to
time delay issues, or the destructive phase interferences that can occur at certain frequencies. The use of this
switch in conjunction with altering the location the location of the subwoofer or full range speaker can have a
dramatic effect on system integration. The “NOR” setting would be considered the normal or default setting,
but be sure to experiment during system set-up. This feature works regardless of the bypass mode.
9.) Subsonic
This four position (OFF, 20, 35 and 50 Hz) switch is very useful to eliminate disturbing low frequencies. The best
is to experiment for best results. This feature works regardless of the bypass mode.
10.) Stereo-Mono
This two position (Stereo-Mono) switch gives in STEREO mode +3 dB and in MONO mode can the amp only be
supplied by the left inputs.
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11.) Power input, Fuse Sled and voltage Switch
Connect the supplied standard IEC AC power cable here. Be sure to confirm and install the properly rated fuse
when replacing the fuse or changing the operation voltage. Slide to change the operation voltage from 115 to
230 Volts.
12.) Power
Switches on the DSW-500N
Note: The power led is normally green. When change to red is the limiter protection activated.
NOTES ABOUT HUM
While the DSW-500N has designed to minimize the possibility of hum in the subwoofer or full range system, it
still possible that a hum will occur in rare circumstances. Its safety grounding can create a path for small
amounts of 50 to 60 Hz (depending of the frequencies in the power jackets) energy to travel trough the linelevel audio system. To reduce hum, all connections can be connected to a single grounded outlet.
Rated Power Output:
Signal to Noise Ratio:
Input Impedance:
Sweep Control:
Subsonic Filters:
Other Controls:
Dimensions:
Power Requirements:
Weight:
SPECIFICATIONS:
300 watts RMS into 8 ohms @ 0.1% THD
500 watts RMS into 4 ohms @ 1.0% THD
90 dB A-weighted
12K ohms
30 – 200 Hz, 24 dB per octave
OFF, 20, 35, 50 Hz
Phase 0° (NOR) or 180° (REV), LPF-Filter
HPF-Filter, Stereo-Mono- and Bypass switch
304 mm W x 304 mm H x 135 mm D
115/230 VAC, 50/60 Hz, 800 W
Fuse 8 AT, 250V (115VAC)
Fuse 4AT, 250V (230VAC)
8, 9 kg
Important Safety Instructions
To reduce the risk of electric shock, do not remove cover. No user serviceable parts inside. Refer serving to qualified
personnel. To reduce the risk of fire and shock do not expose unit to rain or moisture. The unit should be connected an
earth grounded AC electrical socket. The unit should be operated in a well ventilated area. Minimum clearance is 5 cm from
the ventilation openings.
Note: Before starting, make sure that the voltage selector is in the correct position depending on the power outlet.
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