Amplification Modes - EMPHASER EA490-200 Installation & Operating Manual

EA490200 Manual 28.07.2000 16:11 Uhr
„4-CH INPUT MODE" is used with head units featuring two
pairs of RCA stereo pre-outs i.e. front and rear pre-outputs (each L&R).
In this case, the amplifier must be switched to „4-CH" input mode (DIP
switch down, see fig. 2. As the „4-CH" input mode operates with 2 pairs of
RCA inputs, it also provides full support of the fader control of the head-
unit. The subwoofer channel always remains unaffected by the front/rear
satellite fader setting.
Please note: The EA 490-200 is a 5-channel concept amplifier featuring
high-pass filtering (HPF) for all satellite channels and low-pass filtering (LPF)
for the subwoofer channel. Therefore these HPF and LPF filters may be indi-
vidually adjusted in their respective cut-in/cut-off frequency range, but they
cannot be switched off or by-passed completely.
FRONT INPUTS REAR INPUTS
FRONT REAR
LEFT RIGHT LEFT RIGHT
(2-CH INPUT)
LEVEL FREQ. LEVEL FREQ. INPUT MODE
125 125 2-CH
50Hz 250Hz 50Hz 250Hz 4-CH
Front
RCA
L R Inputs L R
Seite 9
fig. 2
LEF
SUB LEVEL CONTROL
REAR SPEAKERS FREQ. INPUT MODE FRONT SPEAKERS SUBWOOFER
INPUT
R L 125 R L
2-CH
SUB FREQ.
80
40Hz 120Hz
0 Hz 250 Hz 4-CH
Rear Dip Switches
RCA Down for „4-CH"
Inputs INPUT MODE
2.3 Location of the Amplifier
The location of the amplifier should be carefully selected. In the interest of pas-
sive driver and passenger safety, the amplifier must be securely mounted.
Check the suitability of your preferred amplifier location carefully before the
installation. The mounting location should be either in the trunk or in the pas-
senger compartment. The actual mounting surface should be completely
flat. Any mounting position allowing for a good air stream across the cooling
fins of the amplifier's heatsink will improve cooling (operating temperatu-
re!) and long-term stability dramatically. Make sure there is no wiring harn-
ess, fuel tank etc. behind or below the mounting surface, that may be dama-
ged by the drilling of the holes for the amplifier mounting screws. After in-
stallation there should be a clearance of at least 5cm on all sides including
the ventilated top of the amplifier heatsink. Make sure the unit is not expo-
sed to direct sunlight, humidity, water, oil or other fluids that may enter the
amplifier.
GND +12V

2.4 Amplification Modes

The EA490-200 is a full concept amplifier, i.e. an all-in-one solution for a su-
per compact and user friendly realization of a fully active high-end car au-
dio amplification. The EA 490-200 allows the cross-over controlled amplifi-
cation of a complete satellite/subwoofer audio concept, i.e. 2 pairs of satel-
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