Krix Seismix 3, Seismix 5 owner manual features

features

Automatic on / off circuit

Standby Mode

Symetrix Vent

Clipping protection

-Opto-compressor with fast attack to prevent overload

-Soft limiting to prevent amplifier clipping

Multi-layered fault protection

-DC Detect Sensor

-Thermal Sensor

-Mains Fuse

Electronic filtering

-Earth lift switch to eliminate ground loops

-2nd order low pass filter adjustable from 60Hz to 150Hz

-Adjustable Hi / Lo gain setting

-0°/180° phase switch

-Fixed 2nd order high pass filter to reduce driver excursion below 30Hz

Independent adjustable gain control

Heavy duty, high efficiency long throw paper cone drivers designed for high level sound reinforcement

High current low noise amplifier

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 figure 1). The Auto Circuit monitors both the speaker level or line level inputs and powers the amplifier 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 flash.

Warning: it is recommended that the unit is turned off at the mains power if being left unattended for any extended periods.

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 reflex venting, with the vent exhibiting the same flare radius both internally and externally. This lowers subwoofer distortion and serves to reduce vent turbulence or “chuffing” 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 amplifier continues to place a strain on the compressor circuit, a soft limiting circuit activates. The soft limiter circuit monitors the Seismix’s amplifier power supply voltage and prevents a direct current (DC) signal from reaching the bass driver, causing damage.

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 amplifier. A microcontroller is a small single chip computer optimised for hardware control that runs a program stored in flash memory on the chip. The construction of the Seismix amplifier utilises surface mount technology (SMT), which results in a more compact design, high resistance to mechanical vibration and higher circuit performance. The filter capacitor bank present in the Seismix amplifier 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 amplifier will not only shut down, but all LED’s will flash. 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 amplifier’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 amplifier to normal operating settings by increasing the output by 1dB every

20 seconds.