Rotel RA-1570: Speaker Outputs r

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RA‑1570 Stereo Integrated Amplifier

Speaker Outputs  r

See Figure 3

The RA-1570 has two sets of speaker outputs, labeled SPEAKER A and 

SPEAKER B. The speaker outputs are controlled by the switch 

7

on 

the front panel and the buttons 

O

on the remote control.

Speaker Selection 

If only one set of speakers will be used at any given time, the speakers 

may have an impedance as low as 4 ohms. If there are times when 

both the A and B speakers will be used, all the speakers should have an 

impedance of 8 ohms or more. Speaker impedance ratings are less than 

precise. In practice, very few loudspeakers will present any problems for 

the RA-1570. See your authorized Rotel dealer if you have any questions. 

Speaker Wire Selection

Use insulated two-conductor stranded wire to connect the RA-1570 to 

the speakers. The size and quality of the wire can have an audible effect 

on the performance of the system. Standard speaker wire will work, but 

can result in lower output or diminished bass response, particularly over 

longer distances. In general, heavier wire will improve the sound. For 

best performance, you may want to consider special high-quality speaker 

cables.Your authorized Rotel dealer can help in the selection of cables 

for your system. 

Polarity and Phasing 

The polarity – the positive/negative orientation of the connections – for 

every speaker and amplifier connection must be consistent so all the 

speakers will be in phase. If the polarity of one connection is reversed, 

bass output will be very weak and stereo imaging degraded. All wire 

is marked so you can identify the two conductors. There may be ribs 

or a stripe on the insulation of one conductor. The wire may have clear 

insulation with different color conductors (copper and silver). There may 

be polarity indications printed on the insulation. Identify the positive and 

negative conductors and be consistent with every speaker and amplifier 

connection.

Speaker Connections 

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Turn off all the components in the system before connecting the speakers. 

The RA-1570 has color-coded binding post type speaker connectors on 

the back panel. These connectors accept bare wire, connector lugs, or 

dual banana type connectors. (except in European Community countries 

where their use is not permitted)

Route the wire from the RA-1570 to the speakers. Give yourself enough 

slack so you can move the components to allow access to the speaker 

connectors. 

If you are using dual banana plugs, connect them to the wires and then 

plug into the backs of the binding posts. The thumbscrews of the binding 

posts should be screwed in all the way (clockwise). 

If you are using terminal lugs, connect them to the wires. If you are 

attaching bare wires directly to the binding posts, separate the wire 

conductors and strip the insulation from the end of each conductor. Be 

careful not to cut into the wire strands. Unscrew (turn counterclockwise) 

the binding post. Place the connector lug or wire around the binding 

post shaft. Turn the binding post clockwise to clamp the connector lug 

or wire firmly in place. 

NOTE:

 Be sure there are no loose wire strands that could touch 

adjacent wires or connectors. 

PHONES Output  5

The Phones output allows you to connect headphones for private listening. 

This output accommodates standard stereo phone (1/8”) plugs. Plugging 

in a set of headphones does not cut off the signal to the speakers. Use 

the Speaker Selector to turn off the speakers. The settings of the Function 

Selector determines which source is heard.

NOTE: 

Because the sensitivity of speakers and headphones can 

vary widely, always reduce the volume level before connecting or 

disconnecting headphones.

Remote Sensor  2

This remote sensor window receives IR commands from the remote control. 

Please do not block this sensor.

Display  3

The front panel display shows the source selected, volume level and 

tone settings.

Front USB Input  6

The front USB input can be connected to a iPod, iPhone, MP3 players or a 

Bluetooth dongle (supplied) for wireless streaming. With iPod or iPhones, 

simply plug the device into the front USB and select USB function from 

the source selector. The iPod, iPhone remains active. Search and play 

tracks as usual and the music will be played through the Rotel system.

Bluetooth Connection

Insert the supplied Bluetooth Dongle into the front USB for wireless 

streaming via Bluetooth, from your device (i.e. mobile phones) to the 

amplifier. From your mobile device, look for “Rotel Bluetooth” and 

connect to it. Connection is normally automatic, but if prompted for a 

password, please press “0000” then press ENT (if necessary) on the 

remote and your device.

Audio Controls 

VOLUME Control 

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B

Turn the controls clockwise to increase the volume, or counter clockwise 

to decrease the volume. From the remote control press the volume + or - 

key to turn the volume up or down. Press the MUTE 

B

 key to completely 

mute the volume. 

BALANCE Control 

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C

The Balance Control adjusts the left-to-right balance of the sound output. 

The factory default is the center position or “0”. To change the balance 

from the front panel, press the MENU 

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key to toggle the front display 

to BALANCE SETTING mode. Then press the - or + keys on the front panel 

to change the value to LEFT or RIGHT. The value can change from L15