Design Features - EMPHASER EA490-200 Installation & Operating Manual

EA490200 Manual 28.07.2000 16:11 Uhr
EA490-200 Design Features
5-Channel Amplifier, i.e. the all-in-one solution for a super
compact and user friendly realization of a fully active 5-chan-
nel high-end car audio system.
Dash-Mount Remote Subwoofer Level Control. The EA 490-
200 comes complete with a compact remote "SUB LEVEL" control which can
be mounted on or under the dashboard of your car. The "SUB LEVEL" control
allows the individual adjustment of the subwoofer volume.
The EA 490-200 will always store the last "Sub Level" adjustment in an EPROM
chip. Therefore it is also possible to make one specific "Sub Level" setting
after the installation of the system and then disconnect the control panel from
the amplifier.
Two Independent MOSFET Power Supplies for Satellite and
Subwoofer Amplification prevent any unwanted interference between
the two amplifier sections. This effectively eliminates audible cross-talk from
the power consuming bass amplifier onto the satellite channels.
Unique Hybrid Amplifier Switching Concept. The EA 490-200
incorporates two separate amplifier switching technologies: the satellite chan-
nels are using MOSFET (metal oxide semiconductor transistor) amplificati-
on, which is known for its outstanding performance in high-frequency re-
production. The amplification of the subwoofer channel is effected via a
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BJT (bipolar junction transistor) amplifier, a switching technology renowned
for exceptional control and extended power handling.
2 Ohm Stable Subwoofer Channel combined with an excellent
damping factor guarantees well-controlled and contoured bass reproduction.
Fully Active Integrated Electronic Frequency Filtering for all
amplifier sections. Both satellite sections (front and rear) feature indivi-
dually adjustable high-pass filtering (HPF) between 50 and 250 Hz with a slo-
pe of 12 dB/oct. The independent low-pass (LPF) subwoofer channel is con-
tinuously adjustable from 40 to 120 Hz and features an exceptionally steep
slope of 24 dB/oct.
Uncompromising Design and Construction using only the best
electrical components including glass-fibre reinforced double-sided epoxy
circuit boards featuring the latest SMD (surface mounted device) PCB tech-
nology and high current handling 24 K gold-plated solid brass power and
signal connecting blocks/sockets and terminals.
Advanced Protection Circuitry 'sensing' short-circuits at the spea-
ker outputs, DC voltage at the outputs and overheating of power electronics.
Faulty connections or operating modes will cause the amplifier to shut-off im-
mediately.
Operating Mode/ Status / Protection - LED signaling operati-
on and/or problems e.g. short-circuits, electrical or thermal overload of the
amplifier and DC voltage at the outputs.
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