Output voltage (V)
Output current (A)
circuit Bias stabilizer
n Two power units, each with an 8-parallel
push-pull arrangement of power MOS-FET
devices, are driven in parallel.
@ 1-ohm operation possible with music signals only
Figure 2 Load impedance vs. output power (output voltage/output current) Figure 1 Circuit diagram of ampliﬁ er section
The ultimate power MOS-FET machine –
This super capable yet astonishingly
nimble monophonic power ampli er features a double instrumentation ampli er
setup for fully balanced signal transmission, augmented by a Double MCS+ circuit
and current feedback topology. Experience outstanding sound and drastically
improved performance parameters including excellent S/N ratio and minimal
THD. A hefty power supply and 16 power MOS-FETs arranged in a parallel push-
pull con guration deliver 1200 watts (music signal) into an ultra-low 1-ohm load.
The M-6000 was born out of a thorough re-evaluation
of the power ampliﬁ er from a new vantage point. Aiming
for nothing less than the ultimate in sound quality, this
monophonic power ampliﬁ er with its massive heat sinks
on both sides stands as an impressive achievement.
The decisive difference to conventional designs lies
in the fact that the M-6000 possesses two completely
identical power ampliﬁ er circuits which are driven in
parallel. Kept entirely separate and mounted on the left
and right sides of the chassis, these circuits deliver output
current reserves on a previously almost unheard-of level.
A damping factor rating of more than 500 demonstrates
that this ampliﬁ er is capable of driving even the most
difﬁ cult, ultra-low impedance loads with ease.
In a high-output ampliﬁ er, the operating conditions of the
power supply and the thermal conditions can change
dramatically from one moment to the next. To ensure
stable circuit operation under such demanding conditions
must therefore be a top priority. In the M-6000, two
major factors which made driving two power ampliﬁ er
units in parallel possible are the use of power MOS-
FET devices, and the Double MCS+ circuit topology.
Power MOS-FETs are renowned for their excellent
high-frequency characteristics, and they exhibit negative
thermal behavior by design. This makes it easy to control
the temperature balance between two power ampliﬁ er
units, achieving stable operation even when the load and
operating conditions change dramatically. The Double
MCS+ circuit works perfectly together with the current
feedback approach to ensure perfectly controlled phase
characteristics over the entire audible range and even
beyond, extending into the ultra high frequency area. This
results in further improved overall performance. ■ 16-parallel push-pull arrangement of power MOS-
FETs delivers linear power progression: 1200 watts
(music signal) into 1 ohm, 600 watts into 2 ohms, 300
watts into 4 ohms, or 150 watts into 8 ohms.
■ Strong power supply with large high-efﬁ ciency 900 VA
toroidal transformer and massive ﬁ ltering capacitors
(48,000 μF x 2).
■ Printed circuit boards made from Teflon with low
dielectric constant and minimum loss.
* Teﬂ on is a registered trademark of DuPont USA.
■ Bridged operation of two M-6000 units allows upgrade to monophonic
ampliﬁ er with even higher power, delivering 2400 watts into 2 ohms
(music signal), 1200 watts into 4 ohms, or 600 watts into 8 ohms.
■ Double MCS+ (Multiple Circuit Summing) topology and current feedback
topology work together for even better S/N ratio.
■ 4-stage gain selector (MAX,
–3 dB, –6 dB, –12 dB) minimizes residual noise.
■ Fully balanced circuitry reliably shuts out
■ Phase selector with Normal and Reverse
■ Large analog peak-reading meter:
● Meter operation and illumination on/off
● Switchable peak hold time: 3 seconds or inﬁ nite
■ Instrumentation ampliﬁ er principle enables fully balanced signal
paths throughout the unit.
■ Input selector button (balanced/unbalanced) on front panel.
■ Massive speaker terminals also accept Y lugs.
High-efﬁ ciency toroidal transformer Filtering capacitors
Meter circuitry and protection circuitry assembly Gain control selector
Speaker terminal assembly