Owner’s Manual
Model
AP1020/AP2090/AP2130
STEREO POWER AMPLIFIER
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INTRODUCTION
Fostex new AP Series amplifiers AP1020, AP1020, AP2090 and AP2130
are designed to withstand severe operating conditions.
It is a commercial use amplifier containing high technology
citcuits designed for stability, durability, small size and
large output.
Contents
Controls and connections (Model AP2090/AP2130)..................................2
Controls and Connections (Model AP1020)..............................................3
Outstanding features................................................................................4
Crossover network, selector switch..........................................................5
Multi–amplfier system examples using AP2090/2130................................6
Block diagram..........................................................................................7
Specifications..........................................................................................8
—1—
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AP2090/AP2130
FRONT PANEL
REAR PANEL
10. Input connector
11. Crossover mode (VR)
12. Crossover mode (Selector)
13. MONO/STEREP selector SW
14. Crossover network output
(HIGH)
1. Power switch
2. Power indicator
3. Output level controller
4. Output level indicator
5. Clip indicator
6. Thermal indicator
7. Compressor / limiter indicator
8. Handle
15. Crossover network output
(LOW)
16. COMP/L switch
17. Speaker output
18. Cooling fan
9. Filter cover
19. Power cord
20. Power supply fuse
—2—
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AP1020
FRONT PANEL
REAR PANEL
1. Power switch
10. AC (Input)
2. Power indicator
3. Output level controller
4. Output level indicator
5. Clip indicator
11. MONO/STEREO switch
12. Fuse
13. Cooling fan
14. Compressor / limiter switch
15. Input connector
16. Output connector CH-1
6. Thermal indicator
7. Compressor / limiter indicator
8. Handle
17.
"
"
CH-2
9. Filter cover
—3—
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OUTSTANDING FEATURES
1) Forced cooling
When the amplifier internal temperature rises, thee cooling
fan automatically changes to high speed to force cool the
heat sink for protecting the amplifier.
2) Level indicator (AP2090, AP2130)
This LED is lit in 5dB steps over the 0 ~ - 30dB range to
check the input signal.
3) Clip indicator
This LED is lit at overload. It will flash on large instant-
aneous inputs but will not pose any problems.
4) Thermal indicator
When this LED is lit, it indicates that the amplifier inter-
nal temperature is unusually high, and the power supply
voltage is reduced automatically to control the amplifier
output.
Consequently, you may notice some distortion when this LED
is lit as the amplifier output has been reduced.
5) Crossover network circuit (AP2090, AP2130)
These contain a 2 way crossover network continuously varia-
ble over 30Hz ~ 2,000Hz at an 18dB/octave slope.
6) Crossover network OUTPUT connector (HIGH, LOW; AP2090 and
AP2130 only)
This output connector allows multi system use with a 2 way
or 3 way speaker system (Refer to Multi System Examples,
page 6) and HIGH PASS/LOW PASS outputs can be obtained from
each output connector.
7) Compressor/limiter circuit
Individual compressor / limiter circuits for each channel are
contained which can be made to function by the rear panel ON
/ OFF selector switch. The limiter can be switched ON / OFF by
the rear panel COMP / L switch. The compressor operates at a
compressinon ratio of 2, from about 1/2 of rated output up to
clipping output, after which the hard limiter functions to
suppress distortion. Consequently, when the limiter is
switched on, the output will not largely distort even at ex-
cess input.
—4—
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CROSSOVER NETWORK, SELECTOR SWITCH
1) FULL
At this position, the crossover network is bypassed, (Hz)
control pot becomes ineffective, a flat response output
against the input signal is obtained at the output connec-
tor. The crossover network outputs (HIGH, LOW) at each con-
nector will be those set by the crossover frequency adjust-
inig knobs.
2) HIGH
When this position is selected, the HIGH PASS signal whose
cutoff frequency is set by the (Hz) knob, is obtained at the
speaker output connector.
3) LOW
When set to this position, the LOW PASS signal whose cutoff
frequency is set by the (Hz) knob, is obtained at the speak-
er output connector.
INPUT CONNECTION
Two types of connectors, XLR3-31 equivalent and 1/4" 3P
phone jack, both of balanced line are wired in parallel.
Polarity of the pins are as follows:
(#1 pin) • • • Ground, (#2 pin) • • • Hot, (#3 pin) • • • Cold
For the stereo mode, the rear panel MODE selector switch is
set to STEREO and the left input is connected to INPUT (1) and
the right input to INPUT (2).
For the mono mode, the selector switch is set to MONO and
the input signal is applied between ground and INPUT (1).
2
3
1
CANNON
PHONE
BALANCED
2
3
HOT
1
—5—
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MULTI-AMPLIFIER SYSTEM EXAMPLE USUNG AP2090/2130
[Example of 2 way system]
AMP 1 (HIGH PASS AMP)
INPUT
FULL
HIGH
LOW
INPUT
H.SP
H
L
HIGH OUT
LOW OUT
2
AMP (LOW PASS AMP)
INPUT
FULL
L.SP
HIGH
H
LOW
L
HIGH OUT
LOW OUT
[Example of 3 way system]
AMP 1 (HIGH PASS AMP)
INPUT
FULL
HIGH
LOW
H.SP
H
L
HIGH OUT
LOW OUT
2
AMP (BAND PASS AMP)
INPUT
FULL
M.SP
HIGH
H
LOW
L
HIGH OUT
LOW OUT
3
AMP (LOW PASS AMP)
FULL
INPUT
L.SP
HIGH
LOW
H
L
HIGH OUT
LOW OUT
—6—
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* 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
CLIP
DC & LF
SENSER
CLIP
SENSER
HA
IN
HPF
PA
OUT
LPF
COMP / LIMIT
LPF
ON / OFF
H. OUT
LOAD
IMPEDANCE
SENSER
PEAK LEVEL
IND.
L. OUT
-30
~
0dB
THERMAL
SENSER
HIGH
LOW
MONO
POWER SUPPLY
M
M
STEREO
THERMAL
IND.
FAN MOTOR
Circuit inside
dotted square
not included in
Model AP1020
CHANNEL 2
—7—
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SPECIFICATIONS
AP1020
AP2090
AP2130
[AMPLIFIER SECTION]
75W+75W. . . . 8Ω 300W+300W. . . 8Ω 450W+450W. . . 8Ω
100W+100W. . . 8Ω 450W+450W. . . 4Ω 650W+650W. . . 4Ω
200W(mono). . . 8Ω 900W(mono). . . 8Ω 1300W(mono). . 8Ω
Rated output
Total
harmonic
distortion
(At 1kHz
rated output)
Reproduce
frequnecy
range
Less than
0.05%
Less than
0.05%
Less than
0.05%
10 ~ 35,000Hz
(At rated out-
put, +0dB,
-1dB)
10 ~ 35,000Hz
(At rated out-
put, +0dB,
-1dB)
10 ~ 35,000Hz
(At rated out-
put, +0dB,
-1dB)
92dB (IHF-A,
100dB)
100dB (IHF-A,
105dB)
100dB (IHF-A,
105dB)
S/N ratio
Input
10kΩ
10kΩ
10kΩ
impedance
Higher than
Higher than
Higher than
Damping
factor
300 (8Ω)
350 (8Ω)
400 (8Ω)
(
1kHz
0.70V
(±1dB, 8Ω)
)
(
1kHz
1.40V
(±1dB, 8Ω)
)
(
1kHz
1.72V
(±1dB, 8Ω)
)
Input sensi-
tivityt (At
rated output)
[ CROSSOVER NETWORK SECTION ]
Crossover
30 ~ 2,000Hz
(18dB/oct.)
30 ~ 2,000Hz
(18dB/oct.)
frequency
Dimensions (mm)
(in mm)
482x43.5x422
482x88x435
482x88x435
(W) x (H) x (D)
Weight
8.1kg
23.0kg
22.6kg
120V/AC
220V/AC
120V/AC
220V/AC
120V/AC
220V/AC
Power supply
240V/AC
215W
210W
240V/AC
630W
955W
240V/AC
745W
AC 100V
AC 120V
AC 220/
240V
1150W
2.28kVA
Power
con-
sumption
550VA
2KVA
Specifications in this manual subject to change for improve-
ment without notice.
Above specifications as of September 30, 1989.
FOSTEX COMPANY 3-2-35 Musashino, Akishima, Tokyo, Japan 196-0021
PRO SOUND DIVISION
* Specifications subject to change without notice.
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© PRINTED IN JAPAN FFR. 1990 8629000301 SG
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