- 4 -
+
+
-
-
+
2 ohm
TWO 4 OHM SPEAKERS IN PARALLEL.
SPEAKER CONNECTION EXAMPLES
TWO 4 OHMS SPEAKERS IN SERIES.
8 ohm
+
+
+
-
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Not a recommended way to connect, the power is
only half.
SPEAKER CONNECTION, FILTER SETTINGS
2.7 PROTECTION CIRCUITS
PROTECTION LED
The amplifier has internal protection. The red
protection LED is illuminated when fault condition
exists and the amplifier immideately shuts down. If
illuminated, turn amplifier off, check for shorted spea-
ker wires and attempt to re-power amplifier. When
the amplifier overheat and thermal protection shuts
the amplifier off, the LED does not illuminate.high
current protection circuit shutting down the amplifier
if the current draw is too high.
OVERLOAD LED
Allow self-test when power is turned on and then LED
should be illuminated during checking. It should be
automatically turned off 3 seconds later. It will
illuminate if there is trouble like speaker short or if
any part of the amplifier is overloaded.
2.6 FINAL SYSTEM SETUP
Before connecting the amplifier to the battey, recheck
all connections. When you connect the main fuse
you will see a little spark, this is normal. But if the
fuse blows at this moment, something is wrong.
Recheck the cabling.
Turn on your head unit, the amplifier starts and the
green POWER LED is lit. Increase the volume and
make sure all speaker works. Readjust levels and
crossover settings if necessary.
2.5 LEVEL SETTING
To adapt the amplifier to all kind of signal sources
with varying levels there are a level control provided
on the amplifier next to the phono sockets. It should
not be used as volume controls.
Start with a ”12 o clock” setting of the level controls.
If you set the head unit volume to 75% of maximum
you should achieve a good sound without distortion.
Find a point of the level setting where the distortion is
just discernible. At this point slightly reduce the control
to eliminate the distorsion.
If you have a system with an amplifier for the front
stereo system it´s necessary to adjust the levels
indiviually to achieve a good sound balance between
the different speakers, different speakers have diffe-
rent sensitivity. Start the level adjustment on the mono
amplifier. After having adjusted the bass level for good
performance, adjust the level to the front system
amplifier for a good sound balance.
3. Internal filters
3.1 Lowpass / Highpass
D 1000 has an internal variable lowpass filter. It can
be set from 35 up to 250 Hz. It also has an internal
higpass subsonic filter that can be set from 15 up to
35 Hz.
LOWPASS FILTER:
The lowpass filter is normally used together with a
subwoofer to remove higher frequencies over the
crossover setting. A normal filter setting is 80 - 100
Hz.
HIGHPASS FILTER:
The highpass filter should be used as a subsonic fil-
ter together with a subwoofer to remove the lowest
frequencies which often causes a rumbling bass
reproduction. A normal setting is 20 - 30 Hz.
3.2 BASS BOOST CONTROL
Adjust the sub boost level of the selected frequency
output from 0 to 18 dB.
PARALLEL TO 1 OHM.
1 ohm
+
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Each speaker is 4 ohm
