Yamaha A-S300 Owner's Manual - Rear Panel

CONTROLS AND FUNCTIONS

4 

En

1 CD input jacks

Used to connect a CD player (see page 5).

2 PHONO jacks and GND terminal

Used to connect a turntable that uses an MM cartridge, 

and to ground the terminal (see page 5).

3 Audio input/output jacks 

Used to connect external components, such as a tuner, etc 

(see page 5).

4 DOCK jack

Used to connect an optional Yamaha Universal Dock for 

iPod or Wireless System for iPod (see page 10).

5 SUBWOOFER OUT jack

Used to connect a subwoofer with built-in amplifier (see 

page 5). 

6 POWER MANAGEMENT switch

Enables or disables the automatic power down function 

(see page 7).

7 SPEAKERS A/B terminals

Used to connect one or two speaker sets (see page 5).

8 IMPEDANCE SELECTOR switch

See IMPEDANCE SELECTOR switch on this page.

9 Power cable

Connect the power cable into the wall outlet (see page 7).

■ IMPEDANCE SELECTOR switch

Do not change the IMPEDANCE SELECTOR switch 

while the power of this unit is turned on, as doing so may 

damage the unit.

If the unit fails to turn on, the IMPEDANCE SELECTOR 

switch may not be fully slid to either position. If this is the 

case, remove the power cable and slide the switch all the 

way to either position.

Select the switch position (LOW or HIGH) according to 

the impedance of the speakers in your system.

Rear panel

CAUTION

Switch 

position

Impedance level

HIGH

• If you use one set (A or B), the impedance of 

each speaker must be 6 

Ω

 or higher.

• If you make bi-wire connections, the 

impedance of each speaker must be 6 

Ω

 or 

higher. See page 6 for details.

LOW

• If you use one set (A or B), the impedance of 

each speaker must be 4 

Ω

 or higher.

• If you use two sets (A and B) simultaneously, 

the impedance of each speaker must be 8 

Ω

 or 

higher.

• If you make bi-wire connections, the 

impedance of each speaker must be 4 

Ω

 or 

higher. See page 6 for details.