Krix Stereo System Seismix 3 User Manual

Owner’s Manual  
Seismix 3 and Seismix 5  
 
features  
Automatic on / off circuit  
Standby Mode  
Warning: it is recommended that the unit  
is turned off at the mains power if being  
left unattended for any extended periods.  
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  
Symetrix Vent  
Standby Mode  
Clipping protection  
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).  
-
Opto-compressor with fast attack  
to prevent overload  
®
ATMEL MEGA16 microcontroller which is  
-
Soft limiting to prevent amplifier clipping  
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.  
Multi-layered fault protection  
-
-
-
DC Detect Sensor  
Thermal Sensor  
Mains Fuse  
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.  
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  
Clipping Protection  
There are several layers of protection in  
the electronics of the Seismix to prevent  
clipping damage.  
Independent adjustable gain control  
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.  
Heavy duty, high efficiency long throw  
paper cone drivers designed for high level  
sound reinforcement  
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.  
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.  
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.  
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.  
 
Earth Lift  
Hi / Lo Gain  
To get the most from all of your speakers they  
must be operating in Phase. That is the signals  
must all be positive going or negative going  
simultaneously. If this is not the case and one  
signal is positive going and the other is negative  
going the result will be a cancellation of signal  
and the sound at those particular frequencies  
will be perceived as quite 'empty' sounding  
and lacking potential impact.  
The Earth Lift button ensures the Seismix  
can be connected to a wide range of stereo  
amplifiers / AV receivers. Should a humming  
noise be evident when the Seismix is connected,  
push the Earth Lift button (see figure 1) which  
The Hi / Lo Gain button (see figure 1) is  
positioned below the blue Power / Standby  
LED, this button allows you to increase or  
decrease the sensitivity of the subwoofer  
without adjusting other settings. In the ’Lo’  
interrupts the current that may be circulating from gain position, a much higher input signal is  
the subwoofer’s signal ground through the mains  
earth wiring (see figure 4). Note: The Earth Lift  
button does not break the mains earth connection  
to the subwoofer, only the connection between  
the subwoofer’s signal ground and the mains  
earth. To guard against electric shock NEVER  
disconnect the mains earth from any appliance.  
required, and you will need to increase the  
main volume control to reach maximum output.  
The setting of the Phase button (ie. 0° or  
180°) and the resulting sound is dependant  
on where the subwoofer is positioned in  
relation to the main speakers. The best way  
to find the correct setting is through trial and  
error during set up by comparative listening  
tests. In most cases the effect will be subtle  
and there won't be a complete lack of bass.  
If no difference can be heard, the position  
of the button is not crucial.  
In the ’Hi’ gain position the output of the  
subwoofer is increased by approximately 20dB,  
requiring a lower input signal, meaning you will  
not need to increase the main volume control  
to achieve the same amount of output.  
Low Pass (Hz)  
Phase  
The Low Pass control (see figure 1) adjusts  
the total bass content from the Seismix. This  
control allows you to adjust the upper limit of the  
Seismix’s frequency range between 60 –150 Hz.  
The higher the selection, the broader the range  
of bass information heard. This setting can be  
adjusted for personal taste and integration with  
your main speakers.  
Signal phase can be left at '0°', or shifted  
180° (inverted), by pressing the Phase button  
(see figure 1). This applies to the output of  
the subwoofer compared to its input.  
The effect of phase can best be shown with  
the representation of a sine wave (see figure  
5). The effect shown in the lower diagram is  
with the signals 'out of phase' and this can be  
rectified by changing the position of the Phase  
button. This will invert the negative going  
signal and the result will be the same as  
the first, 'In Phase', example.  
Figure 4 Earth lift button  
Mains power outlets  
Line Level Inputs  
Denotes chassis Earth  
Denotes signal ground  
Line level inputs (see figure 1 or 2) need to  
be connected to the ‘PRE OUT’ or 'SUB OUT’  
from your stereo amplifier / AV receiver.  
The line level stereo input performs a summing  
function adding the left and right signals where  
applicable, to give a mono (L+R) signal. This  
mono signal is filtered and then amplified  
before being sent to the subwoofer driver.  
Circulating ground currents  
Earth lift button  
Signal connection  
Subwoofer  
Receiver / Amplifier  
Speaker Level Inputs  
Figure 5 Phase  
The speaker level stereo inputs combine  
the signal going to the main left and right  
speakers providing a mono (L+R) signal to  
the subwoofer driver. This mono signal is  
filtered and then amplified in the same  
way as the line level input signal before being  
sent to the loudspeaker. Two pairs of terminals  
are provided so that the speaker level signals  
can “pass through” the subwoofer on the way  
to the main speakers (see figure 1 or 3).  
2
1
2
1
2
1
In Phase  
0
0
0
+
=
=
=
-1  
-1  
-1  
-2  
2
-2  
2
-2  
2
Positive going  
Negative going  
1
0
1
0
1
0
(No output)  
180° out  
of phase  
+
=
-1  
-2  
-1  
-2  
-1  
-2  
 
trouble shooting  
Symptom  
Volume  
Probable Cause  
Treatment  
The volume control will adjust the volume  
of the subwoofer only. The control can be  
set for the subtleties of the lower octaves  
in musical performances or increased for  
the earth shattering explosions and effects  
on movie sound tracks. The volume control  
on your main amplifier / AV receiver controls  
volume for your overall system (see figure 1).  
No noise from the  
subwoofer when  
main power is on  
Auto switch circuit has not  
operated due to no signal  
Play source material and  
gradually increase the volume  
from the main Hi-fi amplifier  
Volume turned down  
Increase Volume on the sub  
Signal has no bass content  
Play source material with  
sufficient bass content  
positioning  
Very little bass coming  
from the subwoofer  
Apart from the source  
Increase setting of the  
Low Pass (Hz) control  
material having little bass  
content, the settings on the  
sub may need adjustment  
The procedure for setting up any subwoofer  
can be time consuming, requiring numerous  
minor adjustments to get the desired result.  
There is no definitive 'correct' way to set up a  
subwoofer. Given different listening environments  
different people’s tastes and different speakers,  
there are a number of variables that have to be  
taken into consideration.  
Try changing position of  
the Phase button  
Increase Volume on the sub  
Change gain button from  
‘Lo’ to ‘Hi’  
Bass content is  
too strong and  
uncomfortable  
to listen to  
Settings on the subwoofer  
may need adjustment  
Decrease the setting of  
the Low Pass (Hz) control  
It is up to the individual listener to adjust  
the Seismix for the character and strength  
of bass that is preferred for whatever type  
of source material is being reproduced.  
Decrease the Volume on  
the subwoofer  
Subwoofer emits  
a humming sound  
Current may be circulating  
from the subwoofer’s signal  
ground through the mains  
earth wiring.  
Activate the Earth Lift by  
pushing the button which  
will break the current loop  
It is beneficial to select music that is familiar  
to you when carrying out listening tests and  
setting up procedures and as a suggestion  
play recordings that use wooden instruments  
such as acoustic guitars, oboes, cello etc.  
These instruments exhibit a strong resonant  
characteristic in the low to mid bass region  
and will highlight unpleasant ‘woody’ or ‘chesty’  
sound qualities suggesting there is too much  
overlap in the bass information between the  
subwoofer and main speakers.  
If you have any queries regarding the Seismix, the set up procedure or any other KRIX  
product, please contact your nearest Krix retailer or Krix direct. Contact details are on  
the back cover of this booklet.  
warranty  
To ne tune the integration of the Seismix into  
your Hi-fi system, start with both the Low Pass  
(Hz) and Volume at the middle setting. Gradually  
adjust the setting of the Low Pass (Hz) either  
up or down (see figure 1). This will vary the  
amount of overlap from the sub to the main  
speakers and increase or decrease the level at  
those frequencies. The effect is a strengthening  
or weakening of the upper bass region. You might  
reach a point where the sound develops a 'boxy'  
or 'chesty' quality which is not desirable. This  
could indicate there is too much overlap from  
the sub to the main speakers and is remedied  
by turning the Low Pass (Hz) back. Adjust the  
Volume level to suit your personal taste.  
5 years warranty applies to the cabinet and speaker  
1 year warranty applies to the amplifier and related internal electronics  
(Refer to the details on the warranty card supplied)  
 
Seismix 3: specifications  
Drivers  
Bass Driver  
Nominal 255mm (10”) diameter paper cone driver developed for  
high level, low frequency reinforcement  
Electronics  
Amplifier Power  
200 watts RMS into the nominal 4 ohm driver  
Maximum instantaneous power 400 watts  
>70dB  
Amplifier S/N  
Distortion - Input to Speaker <0.1% - @ 80 watts RMS  
Line Level Inputs  
Left Input (mono)  
Lo – 900mV RMS for maximum output  
Hi – 100mV RMS  
Left + Right Input (stereo) Lo – 450mV RMS for maximum output  
Hi – 50mV RMS  
General  
Frequency Range  
Output  
22Hz - 150Hz (-6dB) in room response  
120dB maximum SPL in room response  
Auto Power On / Off  
Phase Select  
15 minute delay before switching to standby after no input signal  
0° or 180° (relative to input signal)  
Cabinet  
Enclosure Type  
Dimensions  
Material  
Bass reflex, front vented  
415mm high x 360mm wide x 390mm deep  
17mm MDF  
Finish  
Weight  
Vinyl or lacquered timber veneer  
18kg  
Due to continued development specifications may change without notice  
 
Seismix 5: specifications  
Drivers  
Bass Driver  
Nominal 305mm (12”) diameter paper cone driver developed for  
high level, low frequency reinforcement and large linear cone travel  
Electronics  
Amplifier Power  
400 watts RMS into the nominal 4 ohm driver  
Maximum instantaneous power 800 watts  
>70dB  
Amplifier S/N  
Distortion - Input to Speaker <0.1% - @ 80 watts RMS  
Line Level Inputs  
Left Input (mono)  
Lo – 900mV RMS for maximum output  
Hi – 100mV RMS  
Left + Right Input (stereo) Lo – 450mV RMS for maximum output  
Hi – 50mV RMS  
General  
Frequency Range  
Output  
16Hz - 150Hz (-6dB) in room response  
122dB maximum SPL in room response  
Auto Power On / Off  
Phase Select  
15 minute delay before switching to standby after no input signal  
0° or 180° (relative to input signal)  
Cabinet  
Enclosure Type  
Dimensions  
Material  
Bass reflex, front vented  
460mm high x 395mm wide x 440mm deep  
19mm and 25mm MDF  
Finish  
Weight  
Vinyl or lacquered timber veneer  
30kg  
Due to continued development specifications may change without notice  
 
Krix Loudspeakers Pty Ltd  
14 Chapman Road  
Hackham SA 5163  
Australia  
T 61 8 8384 3433  
F 61 8 8384 3419  
krix.com  
 

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