2
RCA INPUT, BOTH LOW LEVEL AND HIGH LEVEL
•
The amplifier
LEVEL
control has sufficient adjustment range for both low level and high level input into the RCA
jacks. A factory source radio that does not have RCA output, using the wires that are connected to the speakers,
can be directly connected to the RCA jacks when the amplifier
LEVEL
control is adjusted to 8V.
SETTING LEVEL
•
The best way to set system levels is to use a D’Amore Engineering DD-1 and test signals.
Follow their gain overlap instructions.
•
Set the amplifier
LEVEL
control to minimum before you turn on the amplifier for the first time.
•
For lowest distortion and lowest noise the amplifier
LEVEL
should be set at the lowest setting that yields
sufficient loudness without distortion. For lowest noise your source radio volume control should be near
maximum that does
NOT
cause distortion.
•
To find the best amplifier
LEVEL
setting if you are NOT using a DD-1:
1) With the amplifier
LEVEL
at minimum, slowly increase the source radio volume until you hear distortion. Then
turn it down to until the distortion stops.
2) Next, slowly turn up the amplifier
LEVEL
control to the maximum desired loudness, or until the red LED
light flashes on the music’s ocassional peaks. (The LED turns on when there is distortion that can damage your
speakers.) Listen very carefully and turn down the amplifier
LEVEL
control if you hear any distortion.
SETTING SUBWOOFER HIGH PASS SUBSONIC FILTER
•
A subwoofer should have a high pass filter often called a subsonic filter. The purpose of a subsonic filter is to
limit very low frequencies that your subwoofer can not play loud enough without damage. Removing subsonic
frequencies can allow your subwoofer to play louder.
•
For a sealed box, the high pass is typically set between 10Hz and 30Hz to increase power handling capacity.
•
For a vented box, the high pass filter must be set 5Hz lower than the port tune frequency to prevent woofer
damage.
FDP 6.900 V2 CONFIGURATION EXAMPLES
6 CHANNEL STEREO NON-BRIDGED
(SEE GRAPHIC C1 ON PG 3)
•
If you have two input wires from the source deck plug them into inputs 1+2.
Set INPUT switch to 2.
•
If you have four input wires from the source deck plug them into inputs 1+2 and 3+4.
Set INPUT switch to 4.
•
If you have five input wires from the source deck plug them into inputs 1+2 and 3+4. The subwoofer plugs into
channel 5. Set channel 5+6 MODE switch to SUB.
Set INPUT switch to 6.
•
If you have six input wires from the source deck plug them into inputs 1+2, 3+4, 5+6.
Set INPUT switch to 6.
•
If you are NOT using a subwoofer set all switches to flat. If you hear distortion in your woofers set all switch to
HP and adjust all HP frequency until the distortion goes away. This will probably be around 50 Hz to 75 Hz.
