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Pioneer Elite SC-85 Manuale di riferimento
Advanced Multi-Channel Stereophonic Philosophy
[minamoto]
source/origin/foundation
Digital Class D
Amplifier (Direct Energy HD Amplifier)
3
89
87
85
82
81
The Direct Energy HD Amplifier has further evolved as Digital Class
D
Amplifier to meet the needs of the latest HD content. With our
3
MOSFET, the Direct Power FET, a simple, high-power solution is
provided to fully enjoy today's AV entertainment. This year, the
digital circuit power supply has been redesigned on all models, to
provide a clean electric current with reduced noise.
High-Power Simultaneous Multi-Channel Drive
With class AB amplifiers, driving all channels in full power is only
possible for a short time, at around 300 W to 400 W power output.
Pioneer's Digital Class D
Amplifier has plenty of allowance to
3
simultaneously drive 9 channels at 760 W (SC-85) to 850 W (SC-89)
power output, letting you fully enjoy dynamic scenes.
Eco-Friendly
The power consumption of the Digital Class D
exceedingly lower than analog amplifiers — letting you save
energy without compromising performance.
High Efficiency
The Digital Class D
Amplifier has been designed with a simple
3
structure to take a straight signal path, resulting in improved
sound quality.
Low Heat Generation
The simple form of the Direct Power FET has the advantage of
improved thermal characteristics. In addition to the upper-side
heat dissipation from the heat sink, the circuit board's heat
radiation feature is also utilized for downward heat dissipation,
providing efficient cooling for a superior performance.
Quick-Response Sound
The Direct Power FET is directly connected to the print circuit
board without any wiring. This simple structure maximizes
audio performance by reduced noise and improved switching,
offering a quick-responding sound, perfect for digital content
playback.
Improved Circuit Design
On the top two models, dedicated ICs are lavishly used on the
circuit in pursuit of ideal sound. The operational amplifier IC for
SC-85/SC-82/SC-81 Amplifier Circuit Configuration
processing small signal is set apart from the amplifying section
to prevent mutual interference. This allows clear signal to be
Direct Power FET
transmitted to the Direct Power FET. As for the SC-85/SC-82/
SC-81, they adopt a compact integrated IC with space merit. The
FET Driver IC
directly coupled IC reduces signal loss and provides precise
+
signal transmission.
+
-
Analog Signal
Input
SC-89/SC-87 Amplifier Circuit Configuration
FET Driver IC
+
+
-
Analog Signal
Input
Amplifier is
3
LPF
Audio Signal
Output
Direct Power FET
LPF
Audio Signal
Output
ELITE AV RECEIVERS REFERENCE GUIDE
Previous MOSFET
silicon
wire
terminal
print
circuit
board
Class D
Amplifier Assy
3
Direct Power FET features a simple structure with superior heat dissipation
Simultaneous Power Output for Pioneer's Class D Amplifier (9ch)
Pioneer Class D Digital Amp
Pioneer
THD
– 67 W
9ch
2ch
General Class AB Analogue Amp
Model A
THD
– 107 W
9ch
2ch
Previous signal path
Integral
Power
Power Supply
MOSFET
Driver
Low Pass Filter
Audio Input
Signal path length approx: 10-5/8"
Thermal View Comparison of Top Panel
Pioneer
SC-85/SC-82/SC-81 Amplifier Circuit Configuration
Direct Power FET
FET Driver IC
+
+
-
Analog Signal
Input
3
SC-89/SC-87 Amplifier Circuit Configuration
Direct Power FET
silicon
Direct contact
with print
circuit board
Direct Power FET features a simple
structure with superior heat dissipation
Pioneer—only one keeping up
high power with multi-channel
output
Other Models—high power for
2-ch specification, but output
drops with actual 9-ch drive
Power
Model B
THD
– 146 W
9ch
2ch
Power
New model's signal path
Audio Input
Driver
MOSFET
Low Pass Filter
Power Supply
Signal path length approx: 7-7/8"
Brand A
72.9
℃
65.9
58.8
51.8
44.8
37.7
30.7
23.6
16.6
LPF
Audio Signal
Output
Direct Power FET
print
circuit
board
Power
Integral
Power
72.9
℃
65.9
58.8
51.8
44.7
37.7
30.7
23.6
16.6