Focal FPD 900.1, Operation And Configuration Manual

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on sensing circuit. When you connect the high level BTL speaker wires to the RCA input the REM wire is not
necessary.
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
• 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:
With the amplifier
LEVEL
at minimum, slowly increase the source radio volume to around 3/4 without distortion.
Then, slowly turn up the amplifier
LEVEL
control to the maximum desired loudness. 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 10 Hz and 30 Hz to increase power handling capacity.
• For a vented box the high pass filter must be set 5 Hz lower than the port tune frequency to prevent woofer
damage.
ONE AMPLIFIER IN HP, LP OR BP MODE:
40 350
60
85
150
240
300
10 400
15
22
50
115
200
0 180 0 +6dB 8v 0.2v
HP LP x10 x1
D
+
BATT
GND
REM
IN
R
LP PHASE EQ HP
RANGE
LEVEL
SUB
CONTROL
+
+ L
OUT
40Hz
I
R
E
C
T
M
A
S
T
E
R
RADIO
CROSSOVER
HP 50Hz MASTER x1
WOOFER
A1
TWEETER