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m Power amplifier with six identical channels m Parallel push-
pull output stages rated for 100 W x 6 (8 ohms) or 150 W x 6 (4
ohms) m Bridged operation yields 300 W x 3 (8 ohms) m Current
feedback principle combines excellent sound quality with stable
operation m 700 VA Super Ring toroidal transformer
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The solution for high-end multi-channel surround sound six totally separate power units with identical performance deliver ample po wer: 150 W × 6
(4 ohms), 100 W × 6 (8 ohms). Robust power supply with lar ge 700 VA toroidal transformer . Curr ent feedback topology assures excellent high-frequency
characteristics. Bridged mode produces stunning 300 W × 3 (8 ohms).
The CX-260/PX-600 is the long-awaited
preamplifier/power amplifier combination from
Accuphase designed from the ground up for
multi-channel surround systems that aim for
absolute top quality in picture and in sound.
Accuphase's extensive e xperience in the realm
of pure audio is in evidence ev erywhere in these
components. Finally, the true audiophile can
move beyond two-channel stereo and build a
system that provides audiovisual enjoyment
without making any sacrifices when it comes to
sonic accuracy. Discover a new world where
sound and image blend to form a home theater
with true high-end performance.
The Power Amplifier PX-600 incorporates six
identical high-performance amplifiers, making
it possible to reproduce six channels with topnotch quality. The amazingly realistic sound
stage and dynamic scale that can be created
with the PX-600 go far beyond the limitations of
conventional surround sound. The capability for
bridged mode operation allows further upgrading of the unit to sustain, for example, three highoutput channels. Various configurations ranging from one to six channels can be realized,
combining flexibility with superb sonic performance.
amping setup. In combination with a multichannel divider, 2-wa y or 3-way systems as well
as subwoofer enhanced systems can also be
configured.
Parallel push-pull output stages for ample power
6-channel operation: 150 W × 6 (4 ohms), 100 W × 6 (8 ohms)
2-channel operation: 220 W × 2 (4 ohms), 130 W × 2 (8 ohms)
The output stage uses high-power transistors
rated for a collector dissipation of 150 watts and
collector current of 15 ampere. These devices
offer extraordinarily wide and flat frequency
response, and their forward-current transfer ratio
linearity as well as their switching characteristics
are excellent. These devices are arranged in a
parallel push-pull configuration (Figure 2) and
mounted to very large aluminum diecast heat
sinks for efficient cooling.
Bridged mode generates even more output
muscle
3-channel bridged operation: 320 W × 3 (6 ohms), 300 W x 3 (8 ohms)
2-channel bridged operation: 420 W × 2 (6 ohms), 350 W x 2 (8 ohms)
For bridged mode, two amplifiers with opposite
polarity are driven with a reverse-phase input
signal, and the output of both amplifiers is
combined before being sent to the speaker . This
allows upgrading to even higher power,
providing ample reserves even with very
demanding source material.
Current feedback circuit topology prevents
high-range phase shifts
The PX-600 uses the signal current rather than
the more conventionally used voltage for feedback. The impedance at the current feedback
Principle of current feedback amplifier
Six totally separate power units with
identical performance allow operation in one
to six channels
Figure 1 shows a block diagram of the PX-600.
The six high-quality power units can reproduce
for example the 5.1ch sound from a D VD pla yer
source with unprecedented realism and
authority. It is also possible to bridge two bloc ks
each, and to combine normal mode and bridged
mode operation. This results in utmost fle xibility ,
covering a range from 1 to 6 channels. For
example, you can enjoy two-channel stereo in
pure audio fashion or realize a high-class bi-
✻ Do not stack the CX-260 and PX-600.
Fig. 1 Block diagram of PX-600
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point is kept very
low, which means
that there is almost
no phase shift.
Phase compensation via negative
feedback can therefore be kept to a
minimum, resulting
in excellent transient response and
superb sonic transparency. Figure 3
shows frequency
response for different gain settings of
the current feedback amplifier. The
graphs demonstrate that response
remains uniform
over a wide range.
n T otal of six channel
power amplifier
units (with parallel
push-pull output
stage and current
feedback)
mounted to large
aluminum diecast
heat sinks.
Fig. 2 Amplifier section circuit diagram (1 channel)
Fig. 3 Frequency response with current feedback
(Response does not change when gain is varied)
BIAS STABILIZER
CIRCUIT
Robust power supply with large "Super
Ring" toroidal power transformer and high
filtering capacity
In any amplifier, the power supply plays a vital
role as the source of energy for the entire unit.
The PX-600 spares no efforts in this regard
thanks to its large, highly efficient 700 VA toroi-
dal power transformer. The transformer is housed in
a non-resonant
aluminum enclosure filled with
damping material
that has excellent
heat transfer characteristics. This
transformer type is
ideal for highpower amplifiers,
since it is characterized by very low
impedance, compact size, and very
high conversion efficiency. In addition, two enormous 47,000 µF
electrolytic capacitors provide more than ample
filtering capacity for the rectified current.
n Three large analog power meters can be
switched to show direct power readings
for 6 channels. A meter operation/light on/
off switch is also provided.
n Large speaker terminals
n Balanced connection protects against
externally induced noise.
Balanced input connectors
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PX-600 Connection Examples
PX-600
★ Use speakers with an impedance between 4 and 16 ohms.
★ In bridged mode, use speakers with an impedance between 6 and 16 ohms.
6-channel surround playback
Connect a source with 5.1ch analog output, such as a DVD pla yer or external decoder ,
to the CX-260, and connect the output from the CX-260 to the PX-600.
6-channel (5.1ch) surround sound playback
★When using a subwoofer with b uilt-in amplifier (activ e subwoof er), connect the "D" output of the
CX-260 directly to the subwoofer input, using audio cables with plugs.
Front (L)
Front (R)
Center
DVD Player
Subwoofer
CX-260
Rear (L)
Rear (R)
2-channel (stereo) playback
A Stereo playback using 2 channels of
PX-600
B Stereo playback using 4 channels of
PX-600 in bridged mode
Bi-amp system for stereo playback
In a bi-amped system, the LOW and HIGH
range speaker units are driven by separate
full-range amplifiers, which can result in
better sound quality.
★A preamplifier with two outputs is required. A
speaker type with built-in network but separate
LOW/HIGH inputs is required.
RightLeft
Preamplifier
PX-600
RightLeft
Preamplifier
PX-600
PX-600
4-channel (mixdown) playback
Playback using 2 front and 2 rear channels. No center speaker or
subwoofer is required. (Set "DO WN MIX" button of CX-260 to ON.)
DVD Player
CX-260
PX-600
Front (L)
Front (R)
n FRONT PANEL
n REAR PANEL
A Meter display indicators
B Bridging indicators
C Meter on/off switch
D METER selector: L, C, R/A, D, B
E Power switch
F Power meters (switchable for 3 channels)
m The 6 channels (LEFT, RIGHT , A, B, C, D) have identical specifications
and are totally separate from each other.
m The LEFT/A, C/D, and RIGHT/B pairs can be individually bridged.
Bridge Bridge Bridge
G 6-channel speaker outputs
H Mode selectors (input type and bridge mode)
I 6-channel unbalanced inputs
J 6-channel balanced inputs
K AC power supply connector
Supplied accessories: • AC power cord
Rear (L)
★
★
Multi-amp or subwoofer system
Using the six power amplifier channels effectively, a high-quality multi-amp system
can be configured with a single PX-600.
★A Multichannel Divider (F-20, F-25V,
DF-35 or similar) is connected.
Rear (R)
★Use a subwoofer without built-in power
amplifier (passive subwoofer).
A 3-way multi-amplifier system
B 2-way multi-amplifier system
C Stereo + subwoofer system
Left system
Preamplifier
Channel
divider
D 2-way multi-amplifier + subwoofer
system
(3-way multi-amp system example)
PX-600 Guaranteed Specifications
Guaranteed specifications are measured according to EIA standard RS-490.
m Continuous Average Output Power (20 ~ 20,000 Hz)
m Total Harmonic Distortion Six-channel operation 0.15%, with 4 ohm load
m Intermodulation Distortion 0.003%
m Frequency Response At rated output: 20 - 20,000 Hz +0, –0.2 dB
m Gain (for all channels) 28.0 dB
m Output Load Impedance Six-channel operation: 4 to 16 ohms
m Damping Factor 100 (Normal mode) 50 (Bridged mode)
m Input Sensitivity Six-channel operation 1.12 V for rated output
m Input Impedance Balanced: 40 kilohms
m Signal-to-Noise Ratio (A-weighted, input shorted) 120 dB at rated output
m Output Level Meters –40 dB to +3 dB Logarithmic scale, with OFF switch
m Power Requirements AC120 V/230 V (Voltage as indicated on rear panel) 50/60 Hz
m Power Consumption 166 watts idle, 690 watts in accordance with IEC-65
m Dimensions Width 475 mm (18-11/16"), Height 211 mm (8-5/16"), Depth 459 mm (18-1/16")
m Weight 31.2 kg (68.8 lbs) net, 38.0 kg (83.8 lbs) in shipping carton
Remarks
★
This product is available in versions f or 120/230 V AC . Make sure that the voltage shown on the rear panel matches the
AC line voltage in your area.
★
The shape of the AC inlet and plug of the supplied power cord depends on the voltage rating and destination country.
Note: The 3ch, 2ch, and 2ch (Bridged) output in the chart is the value for any arbitrary channel.
(for all channels): At 1 watt output: 0.5 - 160,000 Hz +0, –3.0 dB
(with 8 ohm load) 0.11 V for 1 watt output
Note: Load ratings marked ✻ apply only to operation with music signals.
Three-channel operation (bridged mode) 0.05%, with 6 to 16 ohm load
Three-channel operation (bridged mode): 6 to 16 ohms
Note: In bridged mode, 6-ohm loads are permissible for music signals only.
Three-channel operation (bridged mode) 1.95 V for rated output
Two-channel operation 1.28 V for rated output
Two-channel operation (bridged mode) 2.10 V for rated output
Unbalanced: 20 kilohms
0.1%, with 6 to 16 ohm load
Right system
m Specifications and design subject to change without notice for improvements.
http:/www.accuphase.com/
PRINTED IN JAPAN D015Y 851-0119-00 (AD1)
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