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Warning:itisrecommendedthattheunit
isturnedoffatthemainspowerifbeing
leftunattendedforanyextendedperiods.
Standby Mode
Krix have included an energy saving device
when the unit is in Standby mode, meaning
the Seismix draws a meagre 3 watts (costing
approximately AUD$5.00 for 1 year to run).
Symetrix Vent
The Seismix subwoofer enclosure features
Symetrix bass reex venting, with the vent
exhibiting the same are radius both internally
and externally. This lowers subwoofer distortion
and serves to reduce vent turbulence or
“chufng” at high drive levels.
Clipping Protection
There are several layers of protection in
the electronics of the Seismix to prevent
clipping damage.
Opto-compressor: When faced with a signal
peak which is in excess of what the Seismix
can accurately reproduce, a compressor circuit
activates to reduce the level of the signal once
it passes the preset threshold. This permits the
Seismix to perform at high level with only a
mild reduction in the signal’s dynamic content.
Soft Limiter: If severe overdriving of the
amplier continues to place a strain on the
compressor circuit, a soft limiting circuit
activates. The soft limiter circuit monitors
the Seismix’s amplier power supply voltage
and prevents a direct current (DC) signal from
reaching the bass driver, causing damage.
features
Automatic on / off circuit
Standby Mode
Symetrix Vent
Clipping protection
- Opto-compressor with fast attack
to prevent overload
- Soft limiting to prevent amplier clipping
Multi-layered fault protection
- DC Detect Sensor
- Thermal Sensor
- Mains Fuse
Electronic ltering
- Earth lift switch to eliminate ground loops
- 2
nd
order low pass lter adjustable
from 60Hz to 150Hz
- Adjustable Hi / Lo gain setting
- 0°/180° phase switch
- Fixed 2
nd
order high pass lter to
reduce driver excursion below 30Hz
Independent adjustable gain control
Heavy duty, high efciency long throw
paper cone drivers designed for high level
sound reinforcement
High current low noise amplier
Automatic On / Off Circuit
For the auto circuit function to operate, the
power switch on the back of the subwoofer
needs to be left on (and can be done so safely,
see gure 1). The AutoCircuit monitors both
the speaker level or line level inputs and powers
the amplier in the subwoofer. When a signal
is present the blue Power/Standby LED at
the top of the rear panel will remain lit. When
a signal is not present, the power will remain
on for approximately 15 minutes and will then
automatically switch itself to standby mode.
In standby mode the blue Power/Standby
LED will ash.
Fault Protection
The mains fuse protects against any
major electrical faults or short circuits
and incorporates an inrush current limiter
to eliminate power surges when using the
main on / off switch. The Seismix uses an
ATMEL MEGA16
®
microcontroller which is
the integrated circuit responsible for the
advanced fault protection features of the
Seismix amplier. A microcontroller is a small
single chip computer optimised for hardware
control that runs a program stored in ash
memory on the chip. The construction of
the Seismix amplier utilises surface mount
technology (SMT), which results in a more
compact design, high resistance to mechanical
vibration and higher circuit performance. The
lter capacitor bank present in the Seismix
amplier features many low Equivalent Series
Resistance (ESR) capacitors allowing lower
supply impedance and greater instantaneous
power delivery to the loudspeaker load.
DC Detect Sensor: Clipping is severe square
wave distortion that contains a direct
current (DC) component often responsible
for loudspeaker damage. In the event of an
abnormal function the amplier will not only
shut down, but all LED’s will ash. If this
happens turn the subwoofer off and contact
your nearest Krix retailer for further assistance.
Thermal Sensor: The Seismix has a generously
sized heat sink, permitting normal operation
in high ambient temperatures. A thermal
sensor internally connected to the heat
sink is monitored every 20 seconds by the
microcontroller. In the unlikely event that
the amplier’s temperature reaches above
65 degrees celsius the microcontroller
will reduce output by 1dB every 20 seconds
until the temperature is 65 degrees celsius
or below. The microcontroller will return
the amplier to normal operating settings
by increasing the output by 1dB every
20 seconds.