ROTEL RA-1570 - Manual (Page 10)

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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 r
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 4B
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 9C
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
9 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