Crown Micro-Tech 1201 Informations techniques télécharger pdf (Page 18)

Page 18

Micro-Tech 600/1200/2400 Power Amplifiers

Reference Manual

A better approach is to fuse each driver independently.

This allows you to apply the most appropriate protec-

tion for the type of driver being used. In general, low-

frequency drivers (woofers) are the most susceptible to

thermal damage and high-frequency drivers (tweeters)

are usually damaged by large transient voltages. This

means that your loudspeakers will tend to have better

protection when the woofers are protected by slow-blow

fuses and high-frequency drivers are protected by high-

speed instrument fuses.

3.4 AC Mains Power Requirements

All

Micro-Tech

amplifiers are shipped with an appropri-

ate line cord and plug. The standard cord and plug for

each model are listed by country (or region) in Fig-

ure 3.16. When possible, use a power receptacle on a

dedicated circuit, and always make sure it will provide

the right voltage with sufficient current. We do not rec-

ommend operating your amplifier with voltages greater

than 10% above or below the unit’s rated voltage. For

example, an amplifier rated for 120 VAC operaton

should not exceed 132 VAC. See Section 7 for power

requirements under a variety of conditions.

3.3.6 Additional Load Protection

Micro-Tech

amplifiers can deliver very high power lev-

els, so it’s a good idea to add some protection if its not

already built into your loudspeakers. Loudpseakers are

subject to thermal damage from sustained overpower-

ing and mechanical damage from large transient volt-

ages. In both cases, fuses may be used to protect your

loudspeakers.

Thermal protection and voltage protection require dif-

ferent types of fuses. Slow-blow fuses are used to pre-

vent thermal damage because they respond to thermal

conditions like a loudspeaker. High-speed instrument

fuses like the Littlefuse 361000 series are used to pro-

tect loudspeakers from transient voltages. The nomo-

graph in Figure 3.15 can be used to select the correct

fuse for thermal or voltage protection.

There are two common ways to install the fuses. One

approach is to put a single fuse in series with each out-

put. This is easy because there is only one fuse per

channel to install. But if the fuse blows, power is re-

moved from all of the connected loads.

All specifications in this manual were measured using

120 VAC, 60 Hz power mains unless otherwise noted.

Specifications are derived using a mains voltage that is

accurate to within 0.5% with THD less than 1.0% under

all testing conditions. Performance variations can occur

at other AC mains voltages and line frequencies. In ad-

dition, line regulation problems will directly affect the

output power available from the amplifier.

Fig. 3.15 Loudspeaker Fuse Nomograph

Fig. 3.16 AC Mains Cords and Plugs

Country or Region

Micro-Tech

600

Cord Plug Cord Plug

Australia, New Zealand

Brazil, Guam, Hong Kong,

Jamaica, Japan, Peru,

Phillipines, Singapore,

Tahiti, Taiwan, Thailand,

Venezuela

NEMA

5-15P

14/3 SJT NEMA

5-15P

12/3 SO NEMA

5-15P

1.5 mm

AS 3112

10 A

14/3 SJT

BS 546

BS1363

1.5 mm

BS 546

BS1363

1.5 mm

BS 546

BS1363

1.5 mm

Central America,

North America

NEMA

5-15P

14/3 SJT NEMA

5-15P

12/3 SO NEMA

5-20P

14/3 SJT

India, South Africa

Ireland, Norway,

United Kingdom,

United Arab Emirates

1.5 mm

AS 3112

10 A

1.5 mm

Micro-Tech

1200

Cord

AS 3112

15 A

Argentina, Austria, China,

Denmark, Finland, France,

Germany, Greece, Holland,

Indonesia, Italy, Korea,

Malaysia, Portugal, Spain,

Sweden, Switzerland,

Turkey

1.5 mm

CEE 7/7 1.5 mm

CEE 7/7

Plug

Micro-Tech

2400

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Crown Micro-Tech 1201 Informations techniques Page 18

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