● Two totally identical power amplifier units driven in parallel ● Output stage
features novel high-power transistor devices in a dual 8-parallel push-pullarrangement ● Latest low-noise instrumentation amplifier technology ● MCS+
circuit and current feedback topology in amplification stage ● Support for bridged
use of two M-6200 units with even higher output power ● Strong power supply
with massive high-efficiency toroidal transformer and large filtering capacitors

Supreme monophonic power amplifier takes the product concept to its ultimate conclusion –Discrete low-noise instrumentation amplifier construction allows fully balanced signaltransmission, augmented by MCS+ circuit and current feedback topology for outstanding
sound and drastically improved S/N ratio. Hefty power supply and two parallel amplification
units, each featuring an 8-parallel push-pull configuration of new high-power transistors
designed specifically for audio applications, sustain 1200 watts (music signals) into an ultra-low
1-ohm load. Output stage with further lowered impedance realizes a damping factor of 1,000.
Monophonic power amplifiers from Accuphase havealways been at the very forefront of the global high-end
audio scene, as demonstrated by many models that havemade history. While positioned as a successor to theM-6000, the M-6200 approaches the concept of the power
amplifier from a new vantage point. It achieves anunprecedented level of performance that again redefines
what a monophonic power amplifier can be.
Retaining the parallel arrangement of two completely identicalamplification circuits, the M-6200 drastically lowers the noise
floor and improves the damping factor. Parallel operation has
the advantage of significantly bolstering output current

capability, as well as enabling extremely low output
impedance. Furthermore, improvements to the NFB circuit
using remote sensing and other technological refinements
result in a damping factor in excess of 1,000 and make theamplifier capable of delivering constant current down to
extremely low impedance loads. In the input stage, parallel
operation along with optimized gain allocation keeps noiselevels to an absolute minimum, as illustrated by the astonishing S/N ratio of 127 dB at maximum gain and 133 dB at the-12 dB gain setting. Internally, every aspect of the amplifier
has been reworked, and only the very finest parts andmaterials are used. Two identical amplification units are driven

in parallel, each featuring an arrangement of newly developed
audio-grade high-power transistors with excellent performance
characteristics. This ensures low impedance of the output andrealizes constant-voltage speaker drive. It is also possible touse two M-6200 amplifiers in bridged mode for each channel,
thereby creating a system with even more impressive power
output capability, able to deliver 2,400 watts into a 2-ohm load.
Its bold and massive appearance notwithstanding, the M-6200
is a monophonic amplifier that not only impresses throughabundant power and effortlessly dynamic performance but thatreaches to the very heart of the music, expressing even themost delicate and minute details with stunning realism.

Features and Functions■ Two units driven in parallel, each with an 8-parallel push-pull arrangementof high-power transistors deliver linear power progression: 1,200 watts(music signals) into 1 ohm, 600 watts into 2 ohms, 300 watts into 4 ohms, or150 watts into 8 ohms.
■ Strong power supply with massive high-efficiency toroidal transformer in
diecast aluminum enclosure and two large 48,000 µF filtering capacitors.
■ Balanced inputs shut out external noise interference.
■ Low-noise instrumentation amplifier topology in discrete configuration
allows balanced signal paths.
■ Printed circuit boards made from glass cloth fluorocarbon resin with low
dielectric constant and minimum loss.
■ MCS+ (Multiple Circuit Summing) and current feedback principle work
together for drastically enhanced S/N ratio.
■ 4-stage gain selector (MAX, -3 dB, -6 dB, -12 dB) also minimizes residualnoise.
■ Phase selector accommodates both pin 2 ⊕ and pin 3 ⊕ type balanced input
sources.

Large high-efficiency
toroidal transformer

Filtering capacitors withhigh capacitance

Input amplifier/protection circuit assemblyLine/balanced input connectors

Pre-stage/drive stage power supply assembly■ Bridged operation of two M-6200 units allows upgrade to monophonicamplifier capable of delivering 2,400 watts into 2 ohms (music signals).
■ Large analog peak-reading meter:● Meter operation and illumination on/off switch● Switchable peak hold time: 3 seconds or infinite■ Protection circuitry uses non-contact semiconductor (MOS-FET) switcheswith high voltage rating.
■ Oversize speakerterminals also accept Ylugs.
■ Remote sensing
technology usingbalanced feedback froma point near the speakerterminals results inlower impedance andhigher damping factor.

+–+ INPUT

Signal Sensing
NFB
NETWORK+NFBNETWORK–NFBNETWORK- INPUT+ Signal
Speaker Terminals–+- GNDGND Sensing

Remote Sensing

Gain selector

Control circuit assemblyParts selected for high sound quality and reliability

MOS-FET switches

Major parts in signal path are gold-plated

Low-Noise Instrumentation Amplifier Configuration and Further Refined MCS+ Topology
Low-noise instrumentation amplifier in discreteconfiguration allows balanced signal paths

MCS+ (Multiple Circuit Summing) circuit inamplifier section drastically improves S/N ratio

Current feedback principle provides excellent
phase characteristics in high frequency range

The balanced input stage circuitry features instrumentation amplifier topology such as used in high-precision
measuring equipment. This approach ensures perfectly
matched input conditions for the positive and negativeside of the signal and thereby allows the realization ofhigh-performance balanced signal transmission.

The input stage of the amplifier section features
another Accuphase innovation: MCS+ (MultipleCircuit Summing). This innovative method further
reduces noise and at the same time helps to ensurerock-stable performance.

As shown in the illustration, the M-6200 uses theoutput signal current rather than voltage forfeedback. Since the impedance at the current
feedback point is very low, there is almost no phaseshift. A minimal amount of NFB therefore results inmaximum improvement of circuit parameters. The
principle provides excellent stability and is ideallysuited to power amplifiers that handle signals ranging
from extremely low to dynamic, high-volume levels.

Signal Input Stage

Power Amplifier Stage+

8-PARALLELPOWERAMPLIFIER+––NFB
NETWORK+ INPUT− INPUT

TRANS-IMPEDANCEAMPLIFIEROUTPUT

GAIN CONTROLCIRCUIT- INPUTNFBNETWORK–+BUFFER

8-PARALLELPOWERAMPLIFIERLow-Noise Instrumentation Amplifier Configuration

AMPLIFIER

CURRENT ADDER+‒-V
CONVERTER

BUFFER+ INPUTCURRENT NFBNETWORK

Principle of Current Feedback Amplifier

OUTPUT

Output Power Characteristics
1,300

Circuit Diagram of Power Amplification Circuitry
Signal Input Stage

1,250W

MCS+ (Multiple Circuit Summing)

1,200
1,100
1,000
Output power (W)Q17

1,200W

Q25

Q5800

755W

Q1700

Q3

Q9

Q41+ B1

Q45
Q49

Q18

Q13

Q26

Q53

Q57

Q61

Q65

Q69

Q73

Q77

Q81

Q34

BIAS
STABILIZER

8-PARALLEL PUSH-PULL

BIASSTABILIZERBIAS
STABILIZERBIAS
STABILIZER

600500

Q6600W

410W

400200+ B2Q33+ B4900300

High-Power Transistors+ B3BIASSTABILIZER

Q10

Q14

Q35

Q19
Q27− B4Q50
Q28+ INPUT

211W

Max. output power
Rated output power

4Ω2Ω

Q29

1Ω
Q7Impedance (Ohms)

Q70

Q74

Q78

Q82

− B1

OUTPUT+ B2
Q37

Q43+ B1

Q47+ B4Q11

Q66+ B3BIAS
STABILIZER

Q21

Q62

− B3＋– INPUT

Q58

− B2−

DC SERVO

150W
8ΩMAX−3dB
−6dB
−12dB

GND

Q54

Q46
Q42

BIAS
STABILIZERFEEDBACKNETWORKGAIN SELECTOR

300W

100Q36

Q20Q51

Q55

Q59

Q63

Q67

Q71

Q75

Q79

Q83

Q30
Q38Q22

Q15BIAS
STABILIZER

Q2Q4BIASSTABILIZERBIAS
STABILIZER

Q8Q12

Q16

Q23

Q31

Q39− B4Q52
Q32
Q24

High-power transistors for audio applications

8-PARALLEL PUSH-PULL

BIAS
STABILIZERBIAS
STABILIZER

Q40

Q56

Q60

Q64

Q68

Q72

Q76

Q80

Q84

Q48

− B1

Q44− B2− B3Power Amplifier Assembly

Rear Panel Features

Output stage with 8-parallel push-pull power
arrangement of high-power transistors mounted
directly to large diecast aluminum heat sink,also comprising MCS+ circuitry and current
feedback amplifier. Two completely identicalunits arranged at left and right are used.

Operation selector allows
bridged operation of twoM-6200 units.

Phase selector accommodates
pin 2 ⊕ and pin 3 ⊕ typebalanced connections.

■ Using four M-6200 units, upgrading to bridged operation or bi-amping is possible.

■ Connect the input signal either to the balanced or the unbalanced inputs on all units.

Example for bridged connection

Example for bi-amping connection

Bridged operation of two M-6200 units allows upgradingto a monophonic amplifier with even higher power.

Left speaker

Right speaker− terminals to each other, use＊ For connecting the SPEAKER−speaker cable of the same grade as for other speaker connections.

＋Right speaker

HIGHHIGH＊ Set the operation selectors of all four units to NORMAL.

＊ Operation selector of left channel/right channel w unit: REVERSE−

Left speaker＊ The speakers must have a built-in crossover network andseparate inputs for LOW and HIGH range.

＊ Operation selector of left channel/right channel q unit: NORMAL

Branch output

In a bi-amped setup, the speaker units for the LOW
frequency range and HIGH frequency range are driven byseparate amplifiers, for optimum sound quality.

Branch output− ＋BALANCED− ＋LOW

LOW− ＋BALANCED
LINEL

L

R

R

Left-channel unit q

Left-channel unit w

LINELL

R

R

Branch output

Left-channel unit w

Preamplifier

PreamplifierLINE

Left-channel unit q− ＋− ＋BALANCED

LINE

Branch output− ＋− ＋BALANCED

Right-channel unit q

Right-channel unit w

Right-channel unit q

Front panel
q Hold time indicator
3 SEC / ∞r Meter illumination/operation/

hold time selector
OFF / NORMAL / 3 SEC / ∞w Power meter

Rear panel(dB and % indication)t Power switch

Right-channel unit w

e Input indicator

LINE / BALANCED

u Gain selector-12dB / -6dB / -3dB / MAXy Input selector button
LINE / BALANCED

i Inputs

LINE / BALANCEDo Speaker terminals(One is used for signal pass-through)!0 Operation selector

NORMAL / REVERSE(Same output from both sets)!1 Balanced input
phase selector!2 AC power connector★

M-6200 Guaranteed Specifications [Guaranteed specifications are measured according to EIA standard RS-490.]● Continuous Average Output Power (20 - 20,000 Hz)
1,200 watts into 1 ohm(1-ohm loads allowed with music signals only)
600 watts into 2 ohms
300 watts into 4 ohms
150 watts into 8 ohms
Bridged mode (2 units)
2,400 watts into 2 ohms
(2-ohm loads allowed with music signals only)
1,200 watts into 4 ohms
600 watts into 8 ohms
● Total Harmonic Distortion
0.05%
with a 2-ohm load
0.03%
with a 4 to 16-ohm load
● Intermodulation Distortion
0.01%● Frequency Response
At rated continuous average output: 20 – 20,000 Hz +0 -0.2 dB
At 1 watt output:
0.5 – 160,000 Hz +0 -3.0 dB● Gain28.0 dB (GAIN selector in MAX position)● Gain Selection-12 dB, -6 dB, -3 dB, MAX● Output Load Impedance Continuous output: 2 to 16 ohms
With music signals: 1 to 16 ohms

● Damping Factor
1,000● Input Sensitivity (with 8-ohm load)
1.38 V for rated continuous average output
0.11 V for 1 watt output● Input Impedance
Balanced: 40 kilohms
Line:20 kilohms● Signal-to-Noise Ratio (A-weighted, with input shorted)
127 dB (GAIN selector in MAX position)
133 dB (GAIN selector in -12 dB position)
At rated continuous average output● Output Level Meter-40 dB to +3 dB (dB / % indication)
Logarithmic compression scale
Display illumination off switch
Peak hold time select: 3 seconds, ∞● Power Requirements
120/220/230 V AC, 50/60 Hz● Power Consumption
100 watts idle
575 watts in accordance with IEC 60065● Maximum Dimensions Width: 465 mm (183.1")
Height: 220 mm (86.6")
Depth: 499 mm (196.5")● Mass40.2 kg (88.6 lbs) net
50.0 kg (110.2 lbs) in shipping carton

Remarks★ This product is available in versions for 120/220/230 V AC. Make sure that the voltage shown on the rear panel matches the AC line voltage in your area.
★ 230 V version has an Eco Mode that switches power off after 120 minutes of inactivity.
★ The shape of the AC inlet and plug of the supplied power cord depends on the voltage rating and destination country.

Supplied accessory● AC power cord

●The specifications and appearance of this product are subject to change without notice.

5年間保証

D1505Y PRINTED IN JAPAN 850-2191-00（B1）