Accuphase M-6200 User Manual

●

Two totally identical power amplifier units driven in parallel

● Output stage

features novel high-power transistor devices in a dual 8-parallel push-pull arrangement

● Latest low-noise instrumentation amplifier technology

circuit and current feedback topology in amplification stage use of two M-6200 units with even higher output power with massi

ve high-efficiency toroidal transformer and large filtering capacitors

● Support for bridged

● Strong power supply

● MCS+

Supreme monophonic power amplifier takes the product concept to its ultimate conclusion – Discrete low-noise instrumentation amplifier construction allows fully balanced signal transmission, 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 have always been at the very forefront of the global high-end audio scene, as demonstrated by many models that have made history. While positioned as a successor to the M-6000, the M-6200 approaches the concept of the power amplifier from a new vantage point. It achieves an unprecedented level of performance that again redefines what a monophonic power amplifier can be. Retaining the parallel arrangement of two completely identical amplification 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 the amplifier capable of delivering constant current down to extremely low impedance loads. In the input stage, parallel operation along with optimized gain allocation keeps noise levels 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 and materials are used. Two identical amplification units are driven

Features and Functions

Two units driven in parallel, each with an 8-parallel push-pull arrangement

■

of 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, or 150 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 residual

■

noise. Phase selector accommodates both pin 2 ⊕ and pin 3 ⊕ type balanced input

■

sources.

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 and realizes constant-voltage speaker drive. It is also possible to use 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 through abundant power and effortlessly dynamic performance but that reaches to the very heart of the music, expressing even the most delicate and minute details with stunning realism.

Bridged operation of two M-6200 units allows upgrade to monophonic

■

amplifier 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) switches

■

with high voltage rating.

Oversize speaker

■

terminals also accept Y lugs.

Remote sensing

■

technology using balanced feedback from a point near the speaker terminals results in lower impedance and higher damping factor.

+ INPUT

- INPUT

NFB

NETWORK

+ –

– +

NFB

NETWORK

NFB

NETWORK

Signal Sensing

–

Speaker Terminals

GND Sensing

Remote Sensing

+ Signal

- GND

Large high-efficiency

toroidal transformer

Input amplifier/protection circuit assembly

high capacitance

Pre-stage/drive stage power supply assembly

Low-Noise Instrumentation Amplifier Configuration and Further Refined MCS+ Topology

Low-noise instrumentation amplifier in discrete configuration allows balanced signal paths

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 negative side of the signal and thereby allows the realization of high-performance balanced signal transmission.

Power Amplifier StageSignal Input Stage

8-PARALLEL POWER

–

NFB

GAIN CONTROL

CIRCUIT

NETWORK

NFB

NETWORK

–

INPUT

−

AMPLIFIER

–

8-PARALLEL POWER AMPLIFIER

‒

OUTPUT

Line/balanced input connectorsFiltering capacitors with

Gain selector

Parts selected for high sound quality and reliability

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

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

Control circuit assembly

Major parts in signal path are gold-plated

MOS-FET switches

Current feedback principle provides excellent phase characteristics in high frequency range

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

TRANS-IMPEDANCE

- INPUT

+ INPUT

BUFFER

AMPLIFIER

- V

CONVERTER

CURRENT ADDER

CURRENT NFB

NETWORK

AMPLIFIER

OUTPUT

Low-Noise Instrumentation Amplifier Configuration

Principle of Current Feedback Amplifier

1,300

1,200

1,100

1,000

900

800

755W

700

600

Output power (W)

500

400

300

200

100

Max. output powerMax. output power

Rated output powerRated output power

410W410W

211W

150W150W

8Ω 4Ω 2Ω 1Ω

300W300W

600W

Impedance (Ohms)

High-p ower tr ansisto rs for audio a pplicat ions

1,250W1,250W

1,200W

–

INPUT

GND

INPUT

GAIN SELECTOR

MAX

−

3dB

−

6dB

−

12dB

Circuit Diagram of Power Amplification CircuitryOutput Power Characteristics

BIAS

STABILIZER

BIAS

STABILIZER

BIAS

STABILIZER

+ B4

−

FEEDBACK

NETWORK

DC SERVO

+ B4

−

BIAS

STABILIZER

BIAS

STABILIZER

BIAS

STABILIZER

＋

−

BIAS

STABILIZER

BIAS

STABILIZER

BIAS

STABILIZER

BIAS

STABILIZER

+ B3

BIAS

STABILIZER

−

+ B3

BIAS

STABILIZER

−

High-Power TransistorsSignal Input Stage MCS+ (Multiple Circuit Summing)

+ B2

+ B1

8-PARALLEL PUSH-PULL

−

OUTPUT

+ B2

+ B1

8-PARALLEL PUSH-PULL

−

Power Amplifier Assembly

Output stage with 8-parallel pus h-pull power arrangement of high-power transistors mounted directly to large diecast aluminum heat sink, also c omprising MCS+ c ircuitry and current feedback amplifier. Tw o complete ly identical units arranged at left and right are used.

Rear Panel Features

Operation selector allows bridged operation of two M-6200 units.

Phase selector accommodates pin 2 ⊕ and pin 3 ⊕ type balanced connections.

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

Bridged operation of two M-6200 units allows upgrading

Right speakerLeft speaker

to a monophonic amplifier with even higher power.

＊

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

＊

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

＊

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

−

＋

−

＋

−

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

Example for bi-amping connectionExample for bridged connection

LOW

＋−

Right speakerLeft speaker

HIGH

LOW

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

＊

The speakers must have a built-in crossover network and separate inputs for LOW and HIGH range.

＊

Set the operation selectors of all four units to NORMAL.

Branch outputBranch output

＋−

HIGH

BALANCED

LINE

L L

LINE

BALANCED

Hold time indicator 3 SEC /

∞

Left-channel unit q Left-channel unit w

Preamplifier

＋−

Right-channel unit q Right-channel unit w

wPower meter

(dB and % indication)

eInput indicator

LINE / BALANCED

BALANCED

LINE

L L

＋−

BALANCED

Left-channel unit q Left-channel unit w

Branch outputBranch output

Preamplifier

＋− ＋−

LINE

Right-channel unit q Right-channel unit w

Rear panelFront panel

i Inputs

LINE / BALANCED

(One is used for signal pass-through)

o Speaker terminals

(Same output from both sets)

Meter illumination/operation/ hold time selector OFF / NORMAL / 3 SEC /

∞

tPower switch

yInput selector button

LINE / BALANCED

M-6200 Guaranteed Specifications

● 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

● Gain 28.0 dB (GAIN selector in MAX position)

● Gain Selection -12 dB, -6 dB, -3 dB, MAX

Output Load Impedance

●

With music signals: 1 to 16 ohms

Remarks

★

This produc t is available in versions for 120/220/23 0 V AC. Make sure that the voltage shown on th e rear panel matches the AC line voltage in your area.

★

230 V version has an Eco Mode that swi tches power of f after 120 minutes of inactivit y.

★

The shape of the AC inlet and plug of the supplied power cord depends on the voltage rating and destination country.

Supplied accessory

●

C power cord

Continuous output: 2 to 16 ohms

uGain selector

-12dB / -6dB / -3dB / MAX

!0Operation selector

NORMAL / REVERSE

[Guaranteed specifications are measured according to EIA standard RS-490.]

!1Balanced input

phase selector

● 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")

● Mass 40.2 kg (88.6 lbs) net

50.0 kg (110.2 lbs) in shipping carton

!2AC power connector

∞

★

●

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）

Accuphase M-6200 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual