Emphaser EA-S2, EA-S4 Service Manual
EA-S2
2-CHANNEL AMPLIFIER
EA-S4
4-CHANNEL AMPLIFIER
INSTALLATION & OPERATING MANUAL
EINBAU- & BEDIENUNGSANLEITUNG
Thank you for purchasing this EMPHASER amplifier!
To maximize the performance of this amplifier and your complete car audio system install, we recommend that you acquaint yourself thoroughly with all technical features and
controlling options of this EMPHASER amplifier. Please read this manual carefully, before
attempting the installation.
If, after reading this manual, you still have questions regarding functions or the installation
of the amplifier, we recommend that you consult your dealer.
KEY FEATURES
■ 2CH / 4CH Class-A/B Amp for 4/2 Ohms Stereo Operation
■ Bridge Operation into 4 Ohms
■ Adjustable 12dB/octave HP + LP X-Over
■ Crossover deactivatable
■ High Level Input with summation function
■ Protection Circuit
■ Auto-Turn-On Function
■ Moulded Power + Speaker Terminal
TECHNICAL SPECIFICATIONS
Model EA-S2 EA-S4
Number of Channels 2 4
Rated Power Output (RMS)
At 4 ohms / 13.8V (THD<=0.1%) 160 x 2 70 W x 4
Rated Power Output (RMS)
At 2 ohms / 13.8V (THD<=1.0%) 220 x 2 110 W x 4
Rated Power Output (RMS)
Bridged, 4 ohms / 13.8V(THD<=1.0%) 440 W x 1 220 W x 2
Damping Factor
4 ohms/100Hz > 200 > 200
Signal-to-Noise Ratio
(All channels) > 100 dB > 100 dB
Frequency Response
(x-over set to FULL) 10 Hz - 70 kHz 10 Hz - 60 kHz
Channel Separation > 55 dB > 55 dB
Input Sensitivity 1.0 V – 4.8 V 1.0 V – 4.8 V
Integrated X-Over
Slope Rates HPF / LPF 12 dB/octave 12 dB/octave
Cross-Over Frequency:
High Pass
Low Pass
Dimensions (W x H x D) 320 x 129 x 52 mm 320 x 129 x 52 mm
50 - 500 Hz
50 - 500 Hz
50 - 500 Hz
50 - 500 Hz
2 3
EA-S2
CONNECTIONS + CONTROLS EA-S2
CONNECTIONS + CONTROLS EA-S2
1 RCA INPUTS 1/2-CH
Low-level stereo RCA signal input 1/2-CH for connection to head-unit.
2 INPUT GAIN CONTROL 1/2-CH
Input gain potentiometer for channel 1/2-CH, to match the output voltage of the head-
unit to the amplifier’s input.
3 BASS BOOST
To increase bass performance from 0 – 6 dB @ 45 Hz.
4 X-OVER MODE
Switch to choose between high- and lowpass filtering.
5 X-OVER ACTIVATION SWITCH
Switch to de-/activate the crossover filtering section of the amplifier.
6 X-OVER FREQUENCY CONTROL
Control potentiometer to adjust the crossover filtering frequency point of the amplifier.
7 HIGH INPUT
Molex connector terminals to insert the High level adapter (2 x 4-pin) that picks up
the amplified speaker signal from the head unit’s front output (if head unit does not
feature dedicated RCA line outs).
8 SUM ACTIVATION SWITCH
The sum function combines the CH1+3 and CH2+4 input channels.
If the car stereo provides only speaker dedicated signals (i.e. high frequencies only
for tweeter and second output with only low frequencies for the midrange/woofer), this
sum function combines both signals to one complete full range signal.
9 SUM BALANCE CONTROL
Potentiometer to adjust the right volume balance between CH1 and CH2
10 POWER LED
LED to show proper operating status of the amplifier by green illumination. Protect
state of amplifier is signaled by the red LED.
11 “GND” POWER INPUT TERMINAL
Terminal to connect the amplifier to the chassis ground or negative pole of the car
battery.
Side panels
1 2 3 4 5 6
7 8 9
bl bm bn bo bp
EA-S2
12 “REM” INPUT TERMINAL
Terminal to connect the amplifier to the automatic (remote) turn-on / turn-off lead of the
head unit.
13 “B+” POWER INPUT TERMINAL
Terminal to connect the amplifier to the positive +12V pole of the car battery.
14 SPEAKER OUTPUT TERMINAL
Output terminal to connect the speakers to the amplifier in either stereo or bridged
mode.
4 5
CONNECTIONS + CONTROLS EA-S4
EA-S2
EA-S2
CONNECTIONS + CONTROLS EA-S4
1 HIGH INPUT
Molex connector terminals to insert the High level adapter (2 x 4-pin) that picks up
the amplified speaker signal from the head unit’s front output (if head unit does not
feature dedicated RCA line outs).
2 SUM ACTIVATION SWITCH
The sum function combines the CH1+3 and CH2+4 input channels.
If the car stereo provides only speaker dedicated signals (i.e. high frequencies only
for tweeter and second output with only low frequencies for the midrange/woofer), this
sum function combines both signals to one complete full range signal.
3 RCA INPUTS
Low-level stereo RCA signal input for connection to head-unit.
4 INPUT GAIN CONTROL 1/2-CH
Input gain potentiometer for channel 1/2-CH, to match the output voltage of the head-
unit to the amplifier’s input.
5 X-OVER ACTIVATION SWITCH 1/2-CH
Switch to de-/activate the crossover filtering section of the amplifier.
6 X-OVER MODE 1/2-CH
Switch to choose between high- and lowpass filtering.
7 X-OVER FREQUENCY CONTROL 1/2-CH
Control potentiometer to adjust the crossover filtering frequency point of the amplifier.
8 X-OVER FREQUENCY CONTROL 3/4-CH
Control potentiometer to adjust the crossover filtering frequency point of the amplifier.
9 X-OVER MODE 3/4-CH
Switch to choose between high- and lowpass filtering.
10 X-OVER ACTIVATION SWITCH 3/4-CH
Switch to de-/activate the crossover filtering section of the amplifier.
11 INPUT GAIN CONTROL 3/4-CH
Input gain potentiometer for channel 3/4-CH, to match the output voltage of the head-
unit to the amplifier’s input.
12 SUM BALANCE CONTROL
Potentiometer to adjust the right volume balance between CH1 and CH2.
13 POWER LED
LED to show proper operating status of the amplifier by green illumination. Protect
state of amplifier is signaled by the red LED.
14 “GND” POWER INPUT TERMINAL
Terminal to connect the amplifier to the chassis ground or negative pole of the car
battery.
15 “REM” INPUT TERMINAL
Terminal to connect the amplifier to the automatic (remote) turn-on / turn-off lead of the
head unit.
16 “B+” POWER INPUT TERMINAL
Terminal to connect the amplifier to the positive +12V pole of the car battery.
17 SPEAKER OUTPUT TERMINAL
Output terminal to connect the speakers to the amplifier in either stereo or bridged
mode.
Side panels
1 2 3 4 5 6
bmbn
EA-S4
bqbpbo
bsbr
7
8
9bl
6 7
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