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RX-V640
NEW PRODUCT BULLETIN
5/10 (R/L/T/K)
heavy chassis which is also designed for
maximum vibration damping.
Anti-Resonance Aluminum-Extruded
Heat Sink
The large, anti-resonance, aluminum-
extruded heat sink is located on the base
frame with the power amplifier circuit
boards to prevent interference with the
preamplifier and digital processing
sections. The power block is equipped
with a fan, but it is only used for extreme
heat build-up and is not activated during
normal operation, preventing the
occurrence of even the slightest unwanted
noise.
Wide-Range Frequency Response for
DVD-Audio and SACD
With an extremely wide frequency range
of 10 to 100,000Hz, this receiver is
capable of delivering the full potential of
the new digital audio sources DVD-Audio
and SACD.
Optimum Space Utilization
The use of highly integrated LSIs allows
an interior design that maximizes power
and sound quality by positioning all the
digital processors and related circuitry in
one small area. This leaves most of the
space open for the power amplifier
components: transformers, capacitors,
heat sink and so on. This means that
these parts can be much larger than usual
for greater power, that they can be
separated for minimum chance of
interference, and that circuits can be
arranged in straight lines for maximum
signal purity. For example, the tone control
circuit layout is straighter and shorter than
ever.
Finest Parts Used Throughout
In order to realize the goals of massive
power and superlative sound quality,
Yamaha technicians completely re-
evaluated all the parts used in previous
receivers. As a result, many were
replaced with more expensive or custom-
designed units.
ⅷ Extra-Large Custom-Made Block
Electrolytic Capacitors
Developed specifically for the RX-V640,
the 12,000µF block electrolytic capacitors
use low-magnification foil and are
exceptionally high quality.
ⅷ Direct Signal Path Speaker Relays with
Gold-Plated Crossover Connection and
Shielding
Speaker switching is accomplished by
relays right in front of the speaker
terminals, rather than at the switch
position. This results in a shorter signal
path and minimum output impedance.
ⅷ High Performance Myca Capacitors and
Film Capacitors
At this level of sound quality, even these
small parts make a difference. The high
precision FE mica and metallic mylar film
capacitors use polypropylene material
and are the highest performance types
on the market.
ⅷ Extra-Large Low-Impedance
Transformer
The large 4.4 kg low-impedance
transformer is an important factor in the
RX-V640’s extremely stable power supply.
ⅷ Thick PC Board Wiring with 1.6mm
(5/8”) φ Copper Jumper Cables
The audio signal is routed within the
amplifier through exceptionally thick, top
quality wire, ensuring that signal purity is
maintained.
RX-V640 Interior View and Signal Flow ( )
RX-V640 High Quality Parts