DaytonAudio MA1240 Manuale d'uso - Pagina 3

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REAR PANEL:

3. BUS Line Inputs / Outputs

The MA1240 has two common or BUS inputs that

receives audio signals from standard line-level audio

sources and sends them to any or all channels. The BUS

line outputs are direct feed-through to allow the BUS

inputs to be fed to other amplifiers. Be sure to use high

quality RCA cables that feature low impedance, shielding

and high quality connectors.

4. Remote Turn-On Switch

This switch selects the turn-on stimuli that will put the ampli-

fier in ready mode. "Trigger" setting relies on 3-30V AC/DC

voltage going into the trigger input to activate the amplifier.

"Auto" setting senses a signal on the RCA line-level inputs

and automatically puts the amp in ready mode. "On" setting

puts the amp constantly in ready mode so that it can be

controlled by the master power switch on the front panel.

In "Auto" mode, the amplifier will take approximately 15

minutes to return from ready to standby mode.

5. Trigger Input / Output

The trigger input is a handy feature when connecting the

amplifier to an automated audio system. The 3.5mm mini-

plug jack will accept a 3-30V AC/DC output from another

device, or from a separate power supply. When the trigger

input is energized, the amp turns from standby to ON mode.

When using the MA1240 with a receiver without a trigger

output, the voltage can come from a 12V wall wart (3.5mm

tip-positive connector) plugged into the receiver's switched

outlet and the trigger input. The MA1240 can also provide

an output trigger voltage (12DC @500mA max.) to turn on

and off other devices in the audio system. When the ampli-

fier turns off (standby mode), the voltage will drop to zero.

Note: Remember there is a delay of approximately 15

minutes before the amplifier goes to standby when using

the "Auto" turn-on mode.

6. Channel Gain Control

Each channel has its own independent level adjustment.

This allows the output level of each speaker to be per-

fectly matched to its area. It can also be used to limit the

maximum audio level in a certain area.

7. Bridging Switch

By simply flipping a single switch, two channels can be

combined to increase the total power output. This is helpful

when extra power is needed in certain areas.

Note: The minimum impedance for bridged channels is 8

ohms. Also, please observe the proper speaker wiring when

bridging channels. Input selection and volume settings for

bridged channels will be controlled by the left channel. "BR"

is bridged mode and "ST" is non-bridged or stereo mode.

CAUTION: Only change switch positions when the

amplifier is turned off.

8. Input Selection Switch

Each channel is capable of delivering the source from

many inputs. The three main inputs are BUS 1, BUS 2

and LINE IN. The selection for these inputs is done via

the Input Selection switch associated with each channel.

Select the desired source input. Set the Input Selection

switch to BUS 1 (will play source connected to the BUS

1 input), BUS 2 (will play source connected to the BUS

2 input) or LINE IN (will play source connected to that

channel's LINE IN).

CAUTION: Only change switch positions when the

amplifier is turned off.

CLOSE UP OF CONNECTIONS

9. Speaker Output Terminals

The MA1240 uses high quality Phoenix style connectors

for the speaker connections. Use 14-18 gauge stranded

two-conductor loudspeaker wire. Ensure that at least

2 inches of each conductor are separated. Strip away

¼ inch of insulation from each conductor. Connect the

appropriate conductor to each screw terminal, observing

correct polarity. Also, please observe proper speaker wir-

ing when bridging channels.

10. Individual Channel Input

All twelve channels have their own dedicated input that

allows the connection of audio sources in addition to

the common BUS inputs. This is useful when using the

MA1240 with an audio matrix switcher.

11. AC Voltage Switch

The unit is set at the factory for 115V U.S. operation; simply

connect the included IEC power cord to your wall outlet.

For 230V operation, move the voltage selector switch to the

230V position. When operating at 230V the internal fuse

located in the IEC socket should also be changed. In most

230V applications a separate power cord will be required

and is not included.

12. IEC Power Connector

The unit comes with an IEC jack that permits removal of

the AC power cord. This allows the flexibility of chang-

ing the power cord for different countries. The IEC

socket also houses the main fuse holder. Plug the power

cord supplied with the amplifier into the amplifier and a

grounded wall outlet or appropriate surge protector.

CAUTION: DO NOT plug the amplifier's power cord into

a switched outlet, such as what is provided on some Sur-

round Receivers. If you wish to have the amplifier turn on

when the Receiver is powered up, use one of the power

modes, such as Trigger or Audio.

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