Pioneer SC-LX901 Product Reference Manual page 4

Multi-Channel Stereophonic Philosophy
[minamoto]
source/origin/foundation
Class D Amplifier (Direct Energy HD Amplifier)
LX901 LX801 LX701 LX502
The Direct Energy HD (High fidelity class D) Amplifier has further
evolved as Class D Amplifier to meet the needs of the latest HD
content. With our MOSFET, the Direct Power FET, a simple, high-
power solution is provided to fully enjoy today's AV entertainment.
The custom bypass capacitors further enhance the advantages of the
Class D amplifier, producing powerful bass while also featuring
gentle expressiveness.
Direct Energy HD Amplifier Assy
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 Class D Amplifier has plenty of allowance to simultaneously
drive multi-channels at 560 W (SC-LX502) to 850 W (SC-LX901) power
output, letting you fully enjoy dynamic scenes.
Simultaneous Power Output for Pioneer's Class D Amplifier (11ch)
Pioneer Class D Digital Amp
Pioneer
THD
– 67 W
11ch
2ch
Power
General Class AB Analogue Amp
Model A
THD
– 107 W
11ch
2ch
Power
Quick-Response Sound
The Direct Power FET is directly
connected to the print circuit
board without any wiring. This
simple structure maximises audio
performance by reduced noise and
improved switching, offering a
quick-responding sound, perfect
for digital content playback.
Direct Energy Design
The Direct Energy HD Amplifier is designed with a simple
structure. By the optimal straight and short transmission path,
signal loss is minimized while also suppressing noise, resulting in
clear sound reproduction.
Direct Energy HD Amp's signal path
Power Supply
Low Pass Filter
Direct Power FET
Driver
Audio Input
Shorter signal path by linear circuit layout
Custom Bypass Capacitors
Pioneer—only one keeping up
high power with multi-channel
output
Other Models—high power for
2ch specification, but output
drops with actual 11ch drive
Model B
THD
– 146 W
11ch
2ch
Power
Direct Power FET
Silicon
Direct contact Print
with print circuit
circuit board board
Direct Power FET features a simple
structure with superior heat dissipation
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
processing small signal is set apart from the amplifying section to
prevent mutual interference. This allows clear signal to be
transmitted to the Direct Power FET. As for the SC-LX701/
SC-LX502, they adopt a compact integrated IC with space merit.
The directly coupled IC reduces signal loss and provides precise
signal transmission.
SC-LX901/SC-LX801 Amplifier Circuit Configuration
FET Driver IC
+
+
-
Analogue
Signal
Input
SC-LX701/SC-LX502 Amplifier Circuit Configuration
FET Driver IC
+
+
-
Analogue
Signal
Input
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.
Thermal View Comparison of Top Panel
Class D 3 Amplifier
Eco-Friendly
The power consumption of the Direct Energy HD Amplifier is
exceedingly lower than analogue amplifiers — letting you save
energy without compromising performance.
4
AV RECEIVERS REFERENCE GUIDE
Direct Power FET
LPF
Direct Power FET
LPF
Audio
Signal
Output
General Class AB Amplifier
Audio
Signal
Output