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CHAPTER 4: THE MM-10AC SUBWOOFER
20
Each MM-10AC ships with one AC looping connector for
making AC looping cables. Assembled AC looping cables
are available from Meyer Sound.
CAUTION: Do not exceed the current capabil-
ity of the 20-amp Input connector for the
MM-10AC. When looping MM-10ACs, consider the
total current draw for all units on the circuit, including
the first.
POWER CONNECTOR WIRING
The MM-10AC requires a grounded outlet. To operate safely
and effectively, it is extremely important that the entire sys-
tem be properly grounded.
When wiring international or special-purpose power con-
nectors:
■ Connect the blue wire to the black terminal, or the termi-
nal marked with an N.
■ Connect the brown wire to the red terminal, or the termi-
nal marked with an L.
■ Connect the yellow and green wire to the green (or green
and yellow) terminal, or the terminal marked with an E.
CAUTION: When creating AC power cables, it
is important to preserve AC line polarity and
connect the earth ground on both ends of the cable.
The MM-10AC requires a grounded connection.
Always use a grounded outlet and plug. It is
extremely important that the system be properly
grounded to operate safely and properly. Do not
ground-lift the AC cable.
MM-10AC VOLTAGE REQUIREMENTS
The MM-10AC operates safely and continuously when the
AC voltage stays within 100–240 V AC at 50 or 60 Hz. The
subwoofer allows any combination of voltage to GND (neu-
tral-line-ground or line-line-ground).
If the voltage drops below 90 V (brownout), the MM-10AC
uses stored power to continue operating temporarily; the
subwoofer will shut down if the voltage does not rise above
the low boundary before the stored power is used.
If the voltage rises above 264 V, the power supply could
become damaged.
CAUTION: The power source for the
MM-10AC should always operate within the
required voltage range, at least a few volts from the
upper and lower ranges. This will ensure that AC volt-
age variations from the service entry — or peak volt-
age drops due to cable runs — will not cause the
subwoofer’s amplifiers to cycle on and off or cause
damage to the power supply.
MM-10AC CURRENT DRAW REQUIREMENTS
The current draw for the MM-10AC is dynamic and fluctu-
ates as operating levels change. Since different cables and
circuit breakers heat up at varying rates, it is important to
understand the following types of current ratings and how
they affect circuit breaker and cable specifications.
■ Idle Current — The maximum rms current during idle
periods.
■ Maximum Long-Term Continuous Current — The
maximum rms current during a period of at least 10 sec-
onds. The Maximum Long-Term Continuous Current is
used to calculate temperature increases for cables, to
ensure that cable sizes and gauges conform to electrical
code standards. The current rating is also used as a rat-
ing for slow-reacting thermal breakers.
■ Burst Current — The maximum rms current during a
period of around one second. The Burst Current is used
as a rating for magnetic breakers. It is also used for cal-
culating the peak voltage drop in long AC cable runs
according to the following formula:
V pk (drop) = I pk x R (cable total)
The Burst Current can also be used to calculate the AC
looping capability of the MM-10AC.
AC Cable Wiring Scheme
!
Blue = neutral
Brown = hot
Yellow/green =
earth ground
(chassis
!
!