DRAKE SRR60 Instruções de Operação descarregar pdf (Página 9)

Rear Panel Controls & Connections 9

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1. POWER CORD - The power cord connects the

SRR60 Receiver to standard 120 VAC 60 Hz power.

2. FUSE - The fuse holder is in series with the AC

power line. If fuse replacement is necessary, use a

1.6 amp 250 V slo-blo fuse. Rotate the fuse holder

counterclockwise to remove the fuse when neces-

sary.

3. SPEAKER OUTPUT CONNECTIONS - The

speaker output connector consists of 8 screw type

terminals, with a “+ “and a “-” terminal for each of

four speakers.

To connect a speaker wire, use a screw driver to

loosen the screw on the appropriate terminal, insert

the speaker wire, and tighten the screw on the

inserted wire. Make sure the insulation is stripped

from the last 1/4 inch of the wire before inserting it in

the terminal.

Each “+” and “-” pair of terminals is labeled with a

number. The number of the terminal pair corre-

sponds with the number of one of the Speaker

Output Level controls to the right of the connector.

When attaching speaker wires, it is very important to

observe the polarity. A speaker with the wires

attached with the polarity reversed with respect to

the other speakers will produce sound which is out of

phase with the other speakers, resulting in sound

cancellation (dead spots) in various locations

throughout the room.

4. SPEAKER OUTPUT LEVEL CONTROLS -

These controls adjust the relative volume of the

corresponding speaker. LEVEL control 1 controls the

speaker connected to “+” and “-” terminals labeled 1,

LEVEL control 2 corresponds to terminal pair 2, etc.

These controls should be adjusted so that the sound

distribution around the room is uniform. In some

cases, it may be necessary to reduce the volume

from the speakers nearest the instructor somewhat

to avoid acoustic feedback, which can produce a

howl or squeal.

5. AUX OUTPUT LINE OUT CONNECTOR - The

Line Out connector is a 3.5 mm female audio

connector, and produces audio output which can be

used for audio recording devices such as cassette

recorders or computers, or for assistive listening

transmitters.

6. AUX OUTPUT LEVEL - This screwdriver

adjustable control varies the output of the AUX

OUTPUT LINE OUT connector described in “5”

above.

7. AUX 3 INPUT CONNECTOR - This is a 3.5 mm

female audio input connector which is intended for

inputting stereo audio from an external source such

as a cassette tape, CD, or DVD player, a TV, or a

computer. The audio input level for this jack is

controlled by the AUX 3 VOLUME control on the

front panel.

8. INFRARED SENSOR INPUT - These three

female “F” connectors accept input from up to three

infrared sensors placed throughout the classroom.

The actual signals fed into these connectors are 2 to

3 MHz RF signals.

9. LOGIC INPUT - Grounding the center conductor

of this RCA phono connector will mute the SRR60.

10. HOLD TIME - When the SRR60 is muted by

external audio, this screwdriver adjustable control

varies the length of time between the cessation of

external audio and the unmuting of the SRR60. The

approximate range is 1 second when fully CCW to

approximately 15 seconds when fully CW.

11. SENS - This screwdriver adjustable control

varies the audio level sensitivty at the AUDIO INPUT

terminals required to mute the SRR60 from an exter-

nal audio source. The approximate range is 90 volts

when fully CCW to 5 volts when fully CW.

12. AUDIO INPUT - Audio from an external source

such as a public address system is fed to these

terminals for the purpose of muting the SRR60

whenever the external source is active. (See items

10 and 11 above.)

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