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How MCS works
Figure 1 shows the circuit configuration of the model CX-260, where the MCS principle was first introduced. Originally developed as
a six-channel preamplifier for surround sound applications, the CX-260 also features a two-channel mode. Rather than having the remaining four
channels sit idle, they are used also in this mode, with three circuits
for each channel operating in parallel.
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Fig. 1 MCS operation principle
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Performance aspects such as THD and S/N ratio can be considered as being
unique to each circuit, with characteristics that do not exhibit a fixed
phase relationship to each other. As in MDS, the performance improvement that can be expected when combining the output
of each circuit is the square root of the number of circuits (<root>n).
The crucial point here is that circuits as a whole and not simply active
components (such as transistors or FETs) are connected in parallel.
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Fig. 2 Circuit diagram of P-3000
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Figure 2 shows the circuit diagram of the model P-3000. The area enclosed by the broken lines is the MCS section where two circuits
are operating in parallel. The principle is totally different from driving
circuit components in parallel, which is employed in the output stage where
power transistors are arranged in a parallel configuration. This approach
which is used mainly in power amplifiers has the effect of lowering the
output impedance and providing higher power capability.
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The MCS principle from Accuphase affords a notable improvement in S/N ratio
and THD and is used widely in our preamplifiers, power amplifiers, and
other components.
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MCS (Multiple Circuit Summing)
