Pioneer A-20-S: Controls and displays

Controls and displays

03

7

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Chapter 3:

Controls and displays

Front panel

1



/I STANDBY/ON

Switches the amplifier between off and on.

When power is turned on, the power indicator in the 

center of the button will light.

• On the A-10 model, this switches the amplifier 

between standby and on.

2

STANDBY/APD indicator

When power is set to standby, the indicator lights red. 

When the Auto Power Down (APD) function is on, the 

indicator lights green (page 11).

3

SPEAKERS A button/indicator

Use this button to listen to the speaker system 

connected to 

SPEAKERS A

 terminals.

On

 : The indicator lights. Sound is heard from the 

speaker system. (Sound will also be produced from the 

PHONES

 jack.)

Off

 : The indicator goes off. No sound is heard from the 

speaker system. Set to this position when listening with 

headphones.

4

SPEAKERS B button/indicator

Use this button to listen to the speaker system 

connected to 

SPEAKERS B

 terminals.

On

 : The indicator lights. Sound is heard from the 

speaker system. (Sound will also be produced from the 

PHONES

 jack.)

Off

 : The indicator goes off. No sound is heard from the 

speaker system. Set to this position when listening with 

headphones.

5

LOUDNESS button/indicator

Use when listening at low volume levels.

On

 : The indicator lights: Boosts low and high 

frequencies to give added punch to playback even at a 

low volume level.

Off

 : The indicator goes off: Should normally be left in 

this position.

• This button does not operate when the 

DIRECT

button is in the on position.

• When sound volume is raised, the amount of 

change produced by the 

LOUDNESS

 circuit is 

reduced.

3

1

6

2

5

4

7

13

14

9

10

11

12

8

A-30

6

Remote sensor (Except A-10)

Receives the signals from the remote control (page 4).

7

PHONES jack

Use to connect headphones. No sound is produced 

when the 

POWER AMP DIRECT

 button is ON.

8

DIRECT button/indicator

On

 : The indicator lights: When this button is set to ON, 

sound signals are output directly, without being passed 

through the various adjustment circuits (

BASS

, 

TREBLE

, 

BALANCE

, 

LOUDNESS

). This allows reproduction of the 

signals with greater fidelity, but it disables any settings 

made with the 

BASS

, 

TREBLE

, 

BALANCE

 or 

LOUDNESS

controls.

Off

 : The indicator goes off: The signal passes through 

the various frequency adjusting circuits. When the 

indicator is OFF, adjustments can be made with the 

BASS

, 

TREBLE

, 

BALANCE

, and 

LOUDNESS

 controls.

9

BASS tone control

Use to adjust the low-frequency tone. The center position 

is the flat (normal) position. When turned to the right, 

low-frequency tones are emphasized; when turned to the 

left, low-frequency tones are de-emphasized.

• This button does not operate when the 

DIRECT

button is in the on position.

10 TREBLE tone control

Use to adjust the high-frequency tone. The center 

position is the flat (normal) position. When turned to the 

right, high-frequency tones are emphasized; when 

turned to the left, high-frequency tones are de-

emphasized.

• This button does not operate when the 

DIRECT

button is in the on position.

11 BALANCE control

Should normally be left in the center position. Adjust 

balance if the sound is louder from one of the speakers. 

If the right side is louder, turn toward the L (left) position 

and if the left side is louder, turn toward the R (right) 

position.

• This button does not operate when the 

DIRECT

button is in the on position.

12 VOLUME control

Use to adjust the volume level. (Also allows adjustment 

of the headphone sound volume.)

13 INPUT SELECTOR knob/indicators

Turn the knob clockwise or counterclockwise so that the 

indicator lights for your desired input source. Turning 

the knob clockwise causes the lit indicator to right. 

Turning counterclockwise causes it to left. When the 

remote control’s 

MUTE

 button is pressed to mute the 

sound, the indicator for the input source selected with 

the 

INPUT SELECTOR

 knob flashes.

14 POWER AMP DIRECT button/indicator 

(A-30 only)

Press this button when the A-30 is to be used as a power 

amplifier (page 10).

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03

Controls and displays

8

En

Rear panel

See pages 5-6 for details regarding connections.

1

GND (Turntable ground) terminal

This ground terminal is designed to help reduce noise 

when a turntable is connected. It is not a safety ground.

2

SPEAKERS A terminals (Right channel)

3

SPEAKERS B terminals (Right channel)

4

SPEAKERS B terminals (Left channel)

5

SPEAKERS A terminals (Left channel)

6

AC IN jack

Connect power cord to here and an AC wall socket.

7

PHONO (MM) IN terminals

8

TUNER IN terminals

9

SACD/CD IN terminals

10 AUX IN terminals

11 NETWORK IN terminals

12 RECORDER IN/OUT terminals

13 POWER AMP DIRECT IN terminals (A-30 

only)

When using the A-30 as a power amplifier, connect the 

pre-amplifier here (page 10).

14 CONTROL IN/OUT jack (Except A-10)

A-30

1

6

7

2

8

2

10

9

13

11

2

12

2

14

2

2

3

2

4

2

5

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Controls and displays

03

9

En

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Remote control (Except A-10)

STANDBY/ON

DIMMER

SACD/CD NETWORK

PHONO

TUNER

OPTION

AUX

RECORDER

VOLUME

MUTE

LOUDNESS

SPEARKERS

A

B

NETWORK AUDIO PLAYER

ENTER

SOUND

SETUP

APD

DIRECT

RETURN

HOME MENU

FUNC

INPUT

SACD PLAYER

FUNC

NETWORK AUDIO PLAYER

1

8

9

10

12

11

13

2

3

4

6

4

7

5

A-30

8

5

7

3

10

11

1

2

3

4

3

4

3

4

3

12

A-20

6

1



 STANDBY/ON

Switches the amplifier between standby and on.

2

Input selector buttons

Press to select an input source. These select the 

component connected to the corresponding input on the 

rear panel.

• When the A-30 is connected, the 

OPTION

 button is 

disabled.

3

SACD PLAYER control buttons

Use to control Pioneer SACD player.

(Cannot be used to perform playback/pause on the

 PD-D6/PD-D6MK2/PD-D9/PD-D9MK2 models.)

4

NETWORK AUDIO PLAYER control 

buttons

Use to control Pioneer network audio player.

5

LOUDNESS

Use to set the loudness circuit ON/OFF (page 7).

6

MUTE

Mutes/unmutes the sound.

7

DIRECT

Press to access Direct listening (page 7).

8

DIMMER

This button allows the illumination of the unit's front 

panel indicators to be set in three levels (does not affect 

the 

STANDBY

 indicator).

9

INPUT +/–

Use to change the input source. The source changes as 

below.

SACD/CD



NETWORK



PHONO



TUNER



AUX



RECORDER



 Return to the beginning.

10 SPEAKERS A button/indicator

Use this button to listen to the speaker system 

connected to 

SPEAKERS A

 terminals.

11 SPEAKERS B button/indicator

Use this button to listen to the speaker system 

connected to 

SPEAKERS B

 terminals.

12 VOLUME +/–

Use to set the listening volume.

13 APD

Use to set the Auto Power Down function to ON/OFF 

(page 11).

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