Yamaha A12 Manual Do Proprietário

3

ENGLISH

• Before connecting the device to other devices, turn off the power for all 

devices. Before turning the power on or off for all devices, set all 
volume levels to minimum.

• Use only speaker cables for connecting speakers to the speaker jacks. 

Use of other types of cables may result in fire.

• Be sure to observe the amplifier’s rated load impedance (see page 4), 

particularly when connecting speakers in parallel. Connecting an 
impedance load outside the amplifier's rated range can damage the 
amplifier.

• When choosing a power amplifier to use with your speakers, make sure 

that its power output matches the speakers’ power capacity (refer to the 
Specifications on page 4). Even if the amplifier’s power output is lower 
than the speakers’ PGM (program) power capacity, the speakers may be 
damaged when clipping of a high input signal occurs. The following 
may cause damage to speakers:

- Feedback caused when using a microphone.
- Continuous high sound pressure level produced by electronic instruments.
- Continuous high-power output of distorted signals.
- Popping noises caused by turning on equipment, or by connecting or 

disconnecting system components while the amplifier is turned on.

• When turning on the AC power in your audio system, always turn on the 

power amplifier LAST, to avoid speaker damage. When turning the 
power off, the power amplifier should be turned off FIRST for the same 
reason.

• Do not operate this device at high volume levels or at a level that is 

uncomfortable, since it is capable of producing sound levels that could 
cause permanent hearing loss. If you experience any discomfort or 
ringing in the ears, or suspect an hearing loss, you should consult an 
audiologist.

All full-range loudspeakers are fitted with a self-resetting poly switch that protects 
the high-frequency driver from damage caused by excessive power. If a 
loudspeaker cabinet loses high-frequency output, immediately remove power from 
the unit and wait for two to three minutes. This should be long enough to allow the 
poly switch to reset. Reapply power and check the performance of the high-
frequency driver before continuing, with the power reduced to a level that does not 
cause the poly switch to interrupt the signal. (On the subwoofers, the poly switch 
protects the woofer and a similar routine should be followed if the output is lost.)

• Use only Neutrik NL4FC plugs for connecting Speakon connectors.

* Illustrations in this manual are for explanatory purposes only, and may

not match the actual appearance of the product during operation.

* Company names and product names used in this Owner’s Manual are

trademarks or registered trademarks of their respective owners.

■ Phone Plug Wiring

Phone plugs for connection to the phone jack inputs should be wired as
shown on the right. Be sure to use proper speaker cable — NOT shielded
instrument or line cable — for all speaker connections.

■ Neutrik NL4FC Plug Wiring

If you will be using the Neutrik connectors for speaker input,
wire the plugs as shown to the right. Be sure to use proper
speaker cable — NOT shielded instrument or line cable — for all
speaker connections.

Yamaha cannot be held responsible for damage caused by improper use or modifications to the device. 

2– (NO USE)

2+ (NO USE)

1+ : HOT (+)

1– : COLD (–)

Neutrik NL4FC connector