Meyer Sound MM-10 Manuel d'utilisateur télécharger pdf (Page 29)

MM-10 OPERATING INSTRUCTIONS

CAUTION: The power source for the

MM-10ACX 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-10ACX CURRENT DRAW

REQUIREMENTS

The current draw for the MM-10ACX 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. In addition, the

Maximum Long-Term Continuous Current can be used to

calculate the AC looping capability of the MM-10ACX.

■ 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-10ACX.

■ Ultimate Short-Term Peak Current — A rating for fast-

reacting magnetic breakers.

■ Inrush Current — The spike of initial current encoun-

tered when powering on.

You can use the following tables as a guide for selecting

cable gauges and circuit breaker ratings for the system’s

operating voltage.

The minimum electrical service amperage required by an

MM-10ACX subwoofer system is the sum of the Maximum

Long-Term Continuous Current for each unit. An additional

30 percent above the minimum amperage is recommended

to prevent peak voltage drops at the service entry.

NOTE: For the best performance, the AC cable

voltage drop should not exceed 10 V, or

10 percent at 115 V and 5 percent at 230 V. Make

sure that even with AC voltage drops that the AC

voltage always remains within the operating window.

MM-10ACX Current Draw with No Satellite Loudspeakers

Current Draw 115 V AC 230 V AC 100 V AC

Idle Current 0.21 A rms 0.20 A rms 0.23 A rms

Maximum Long-Term

Continuous Current

0.48 A rms 0.31 A rms 0.55 A rms

Burst Current 1.1 A rms 0.6 A rms 1.3 A rms

Ultimate Short-Term

Peak Current

2.2 A peak 1.6 A peak 2.5 A peak

Inrush Current 6.6 A peak 3.7 A peak 7.2 A peak

MM-10ACX Current Draw with Two MM-4XP Satellite

Loudspeakers Attached

Current Draw 115 V AC 230 V AC 100 V AC

Idle Current 0.32 A rms 0.26 A rms 0.36 A rms

Maximum Long-Term

Continuous Current

0.90 A rms 0.51 A rms 1.02 A rms

Burst Current 2.5 A rms 1.3 A rms 3.0 A rms

Ultimate Short-Term

Peak Current

4.5 A peak 2.8 A peak 5.0 A peak

Inrush Current 7.6 A peak 4.4 A peak 8.4 A peak

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Meyer Sound MM-10 Manuel d'utilisateur Page 29

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