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Extracted text from Accuphase CX 260 Brochure (Ocr-read)
Build the high-end home theater of your dreams 2-channel/6-channel
compatible preamplifier features 6-channel (5.1ch) analog inputs/outputs.
Six entirely separate line amplifiers and six preset level controls, high-quality
6-gang volume control. Mixdown function. In two-channel mode, six line
amplifiers are connected in triple parallel MCS configuration.
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. These two
products will allow the true audiophile to build a
home theater that provides audiovisual enjoyment
without making any sacrifices when it comes to
Accuphase's extensive experience in the realm of
pure audio is in evidence everywhere in the CX-
260/PX-600. The no-compromise Accuphase
approach is applied here not only to two-channel
stereo but also to multi-channel operation that
brings the excitement of a concer t hall and the
thrill of a movie theater right into the living room.
The amazingly realistic sound stage that can be
created with these components goes far beyond
the limitations of conventional surround sound.
Music playback in stereo sounds more alive and
realistic than ever, and surround sources acquire
an additional dimension of scale and natural
authority. Discover a new world where sound and
image blend to form a home theater environment
with true high-end performance.
Control center compatible with 2-channel/
Besides conventional 2-channel stereo, the Control
Center CX-260 allows input of a 6-channel (5.1ch)
analog signal as supplied for example by a DVD
player with digital decoder or other processor. Two
input groups named LINE 1 and 2 are provided,
with six balanced and six unbalanced connectors
each. The six-gang main volume control adjusts
all channels in one action, but in addition, six
individual level controls are also provided. This is
possible because the CX-260 has six separate line
amplifier circuits and balanced output stages.
Six discrete line amplifiers designed for
optimum sound. MCS configuration in stereo
mode further improves sound quality.
The CX-260 has six line amplifiers that employ a
pure complementary push-pull configuration and
are built with hand-selected discrete parts. For
minimum noise, three input devices are used in
When the unit is operating in two-channel mode,
the six line amplifiers are connected in a triple
parallel MCS (Multiple Circuit Summing-up)
configuration, as shown in Figure 2. By adding the
performance advantages of each circuit, S/N ratio,
distortion and other important parameters are
further improved, resulting in a stereo amplifier with
even better characteristics.
Current feedback circuit topology prevents
The CX-260 uses the signal current rather than
the more conventionally used voltage for feedback.
The impedance at the current feedback 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
Figure 3 shows
settings of the
demonstrate that response remains uniform over
a wide range.
Modular construction and separate power
transformers for left and right channel
The line amplifiers and balanced output amplifiers
of the six channels are housed in separate
modules. Including other units such as unbalanced
input stages and mixdown circuitry, the CX-260
has a total of 16 modules neatly arranged on a
motherboard. On the power supply side, entirely
separate transformers and filtering capacitors for
✻ Do not stack the CX-260 and PX-600.
Fig. 2 Principle of MCS circuit
(line amplifier operating in 2-channel mode)Principle of current feedback amplifier
Fig. 3 Frequency response with current feedback
(Response does not change when gain is varied)
Circuit diagram of line amplifier (1 channel)
Fig. 1 Block diagram of CX-260
the left and
result in a true
each modular unit, to thoroughly prevent the
possibility of unwanted interaction between
Mixdown function allows 4-channel playback
of 6-channel sources
A special function called "mixdown" lets youcombine the six channels of a 5.1ch source into
four channels for playback. As shown in Figure 4,
the center channel and subwoofer signals of the
six-channel source are mixed into the left and right
front channels, resulting in a 4-channel
arrangement with two front and two rear channels.
This is useful for example when the placement of
the monitor or screen makes it difficult to position
a center speaker, or when the design of the room
is not suitable for a subwoofer. Thanks to the
mixdown function, you can still enjoy 5.1ch
surround program sources in such cases.Individual level controls for all channels
Separate controls for each of the six channels
make it easy to fine-adjust the balance between
Control turned fullyclockwise (max.) : 0 dB
Center click-stop : – 6 dB
Control turned fully counterclockwise (min.) : –
∞ ∞∞ ∞
Once the levels for the channels have been
preset, the master volume control that operates
on all six channels together can be used to adjust
the listening volume. It is also possible to bypass
the preset controls altogether simply by pushing
a switch. In 2-channel mode, the controls are
bypassed by default.
Using an external preamplifier for stereo
For users who wish to dedicate another
preamplifier to pure audio playback, the EXT PRE
button provides an easy solution. This is also the
operation default when power to the CX-260 is off.
Line amplifiers, mixdown circuit,
balanced input/output amplifiers
and other modules neatly
arranged on PCB motherboard
(total 16 modules)Hermetically sealed relays directly connected
to gold-plated input/output connectors
high-quality parts Supplied remote commander RC-20
allows volume adjustment and
program source selection
Assembly for Logic control
Fig. 4 Principle of Mixdown
Other features and functions
Three kinds of options boards are available which
can be installed in rear-panel slots.
All option board inputs are for 2-channel playback.
The DAC-10 cannot be used in the models E-407,
E-406V, E-306V, E-211 and C-265.
The Analog Disc Input Board AD-9 and the Line
Input Board LINE-9 can also be used.
External preamplifier selector button
2ch/6ch selector button
Mixdown on/off button
Preset level control bypass button
Function LED indicators
Channel preset level controls
Output on/off switch
Bass/treble control, TONE ON/OFF
Compensator on/off button
Tape copy switch
Tape recorder switch
(LINE 1 and 2 are 6-channel inputs)
Tape recorder record/play connectors
Unbalanced output connectors
External preamplifier inputs
CD/LINE balanced input connectors
Balanced output connectors
External preamplifier inputs
AC power supply connector
Supplied remote commander allows volume adjustment
and source selection
Dedicated headphone amplifier for optimum sound
Tone controls with summing active filters for pure sound
Balanced output circuitry with bridged feedback
Logic-controlled relays for program source switching
ensure pure sound and long service life
High-quality six-gang volume control
Supplied accessories: Power cord
Audio cable with plugs L-10G (1 set)
Remote commander RC-20
Specifications and design subject to change without notice for improvements.
PRINTED IN JAPAN D015Y 851-0117-00 (AD1)
CX-260 Guaranteed Specifications
Guaranteed specifications are measured according to EIA standard RS-490.
Frequency ResponseBALANCED/UNBALANCED INPUT
3 - 300,000 Hz +0 –3.0 dB
20 - 20,000 Hz +0 –0.2 dB
Total Harmonic Distortion (for all inputs) 0.005%
Rated Output,BALANCED/UNBALANCED OUTPUT 2 V 50 ohms
Output ImpedanceTAPE REC 252 mV 200 ohms
Maximum Output Level (0.005% THD, 20 - 20,000 Hz)
BALANCED/UNBALANCED OUTPUT: 5.0 V
TAPE REC: 5.0 V
Maximum Load ImpedanceBALANCED/UNBALANCED OUTPUT: 600 Ω
TAPE REC: 10 kΩ
BALANCED/UNBALANCED INPUTBALANCED/UNBALANCED OUTPUT: 18 dB
BALANCED/UNBALANCED INPUTREC OUTPUT: 0 dB
Loudness Compensation+6 dB (100 Hz)
Tone ControlsTurnover frequency and adjustment range
BASS: 300 Hz ±10 dB (50 Hz)
TREBLE: 3 kHz±10 dB (20 kHz)
Attenuator –20 dB
Headphones JackSuitable impedance: 4 - 100 ohms
Power RequirementsAC120 V/230 V (Voltage as indicated on rear panel), 50/60 Hz
Power Consumption25 watts
Maximum DimensionsWidth 475 mm (18-11/16")
Height 150 mm (5-7/8")
Depth 405 mm (15-15/16")
Weight17.5 kg (38.6 lbs) net
22.0 kg (48.5 lbs) in shipping carton
Supplied Remote Commander RC-20
Remote control principle: Infrared pulse
Power supply: 3 V DC (IEC R6 batteries × 2)
Maximum dimensions: 55 mm (2-3/16") (width)
194 mm (11/16") (height)
18 mm (7-5/8") (depth)
Weight: 100 g (including batteries)
RemarksThis product is available in versions for 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.
Digital Input Board DAC-10
MDS (Multi Delta Sigma) D/A converter.
Coaxial and optical fiber inputs.
High-quality reproduction of digital music signal from
CD/DVD player, DAT, MD (sampling frequency 32 - 96
kHz, 24 bits).
Analog Disc Input Board AD-10
High-performance, high-gain equalizer for faithful play-
back of analog records.
Internal DIP switches allow MM/MC selection, MC in-
put impedance selection, and subsonic filter on/off
Gain: 36 dB
Input impedance: 47 kilohms
Gain: 62 dB
Input impedance: 10/30/100 ohms, switchable
Line Input Board LINE-10
This option board provides an additional set of conventional
line inputs which can be used to connect a CD player, tuner,
or other component with analog output.
Option board slots
For rated output For 0.5 V output
BALANCED 252 mV 63 mV 40 k Ω
UNBALANCED 252 mV 63 mV 10 k Ω Input
6-channel (5.1ch) playback
Set the input selector to LINE 1 or LINE 2, and set the 6-CH button to ON (LED lit).
The following functions ( - ) operate only on the Left/Right channel:
TONE, COMP, TAPE COPY, TAPE RECORDER, BALANCE, PHONES, MONO, ATT
When using an active subwoofer with built-in power amplifier, directly connect the "D" output
of the CX-260 to the input of the subwoofer, using an audio cable with plugs.
Input shorted, IHF-A weighting
EIA S/N S/N ratio at rated input BALANCED 106 dB 96 dB 1.2 µVUNBALANCED (2ch) 120 dB 96 dB 1.2 µV UNBALANCED (6ch) 119 dB 95.5 dB 1.7 µV InputResidual
2-channel (stereo) playback
Except for LINE 1 and 2, all inputs are 2-channel inputs, so no special steps are necessary.
For LINE 1 or 2, connect the source to the LEFT and RIGHT connectors and set the 6-CH button to
OFF (LED out).
The input from any option board installed in slot OPTION 1 or 2 also is handled in 2-channel mode.
The mixdown (DOWN MIX) and PASS functions cannot be used.
All preset level controls are bypassed.
6-gang volume controlOption board shown in photo is DAC-10