Fostex AP2130, AP2090, AP1020 owner manual 30 ~ 0dB

*General use amplifiers not containing a crossover network can also be used for the low region or high region amplifier.

When Ap20909/2130 are to be used as a full range amplifier, harmful sub-sonic frequencies can be cut off if the crossover network selector switch is set to HIGH and crossover frequency to 30Hz.

If a line transformer is to be connected, always set to HIGH PASS (crossover network selector switch to HIGH) and crossover frequency to 100Hz.

The speaker low region cutoff frequency will slightly change depending on the line transformer used.

Block diagram

IN HA

HPF

LPF

H. OUT

L. OUT

LPF

COMP / LIMIT

ON / OFF

CLIP	CLIP
SENSER

PA

LOAD

IMPEDANCE

SENSER

DC & LF

SENSER

OUT

PEAK LEVEL

IND.

-30 ~ 0dB

THERMAL

HIGH

MONO SENSER

STEREO

THERMAL

IND.

LOW

M

FAN MOTOR

M

POWER SUPPLY

CHANNEL 2

Circuit inside dotted square not included in Model AP1020

—7—