Focal FDP1.900 User Manual

FDP 1.900 : ONE CHANNEL AMPLIFIER
Operation / Configuration

POWER PER CHANNEL:

• 1 x 500 wRMS @ 4ohms

• 1 x 850 wRMS @ 2ohms

• 1 x 500 wRMS @ 1 ohms

• 1 x 1700 wRMS (Two FDP 1.900s Bridged @ 4 ohms only)

INPUT/OUTPUT CONFIGURATIONS

Because this is a one channel amplifier, if both left and right inputs are used, they are mixed to mono, which is useful
for subwoofers.

CROSSOVER CONFIGURATION

The 24 dB per octave crossover can be adjusted so this amplifier can function as:

1. Full range

2. Low Pass for a subwoofer.

3. Band Pass for a subwoofer or midbass of a 3 way speaker.v

4. High Pass for a midbass, midrange or tweeter.

• The amplifier can be used full range with switch in HP position and frequency set to 10 Hz.
HP is always on so it can be used as a subsonic filter.
HP X1 frequency range is 10 Hz to 400 Hz.
HP X10 frequency range is 100 Hz to 4000 Hz.
LP: Adjustment range is 30 Hz to 350 Hz.
Band Pass with switch in LP position and adjusting both HP and LP to desired frequency.

• The remote volume control is always active.
There is a clip distortion light on the remote volume control.
If you see this light on, reduce volume until the light goes out so that you do not damage your speaker.

• Phase is continuously adjustable between 0 degrees and 180 degrees. Adjust by measuring frequency response
at the crossover frequency. Frequency response should be as smooth as possible.

• 40 Hz EQ is adjustable between 0dB and +6dB.
Measure the subwoofer frequency response and adjust EQ to get the smoothest frequency response.
Avoid excess EQ boost because this will make the subwoofer sound “muddy” and cause the amplifier have clip
distortion prematurely.

AUTOMATIC POWER TURN ON/OFF

1. The best way to automatically turn the amplifier power on and off is to use the REM wire from your source radio
connected to the REM amplifier terminal.

2. If your original equipment stereo or source radio has a BTL amplifier then the RCA inputs have an auto turn
on sensing circuit. When you connect the high level BTL speaker wires to the RCA input the REM wire is not
necessary.

1

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.

2

ONE AMPLIFIER IN HP, LP OR BP MODE:

A1

A2

RADIO

RADIO

HP 50Hz MASTERx1

LP 20Hz50Hz MASTERx1

REMOTE SUB CONTROL

WOOFER

CROSSOVER

SUBWOOFER

+–

TWEETER

3