12V Trigger Out; Protection Indicator 3; Input Signal Connections W; Phono Input W And Ground Connection (Gnd) - Rotel RA-630 Owner's Manual

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12V Trigger Out =

See Figure 4
Some audio components can be turned on automatically when they receive
a 12V turn on "signal". The two 12V Trigger Outputs of the RA-630 provide
the required signal. Connect compatible components to the amplifier with a
conventional 3.5mm mini plug cable. When the unit is turned off, the trigger
signal is interrupted, and the components controlled by it are turned off.
NOTE: If you are using other units in the series with Rotel Link, please
use the Rotel Link connection to turn the units on or off. Do not connect
both the Rotel Link and 12V trigger cables. The 12V trigger's power
on or off features will override the Rotel Link features.

Protection Indicator 3

The amplifier has both thermal and over-current protection circuitry that
protects the amplifier against damage in the event of extreme or faulty
operating conditions. The protection circuits are independent of the audio
signal and have no impact on sonic performance. Instead, the protection
circuits monitor the temperature of the output devices and shut down the
amplifier if temperatures exceed safe limits.
Most likely, you will never see this protection circuitry in action. However,
should a faulty condition arise, the amplifier will stop playing and the LED
indicator on the front panel will light up.
If this happens, turn the amplifier off. Let it cool down for several minutes,
and attempt to identify and correct the problem that caused the protection
circuitry to engage. When you turn the amplifier back on, the protection
circuit will automatically reset and the indicator LED should go out.
In most cases, the protection circuitry activates because of a fault condition
such as shorted speaker wires, or inadequate ventilation leading to an
overheating condition. In very rare cases, highly reactive or extremely
low impedance speaker loads could cause the protection circuit to engage.
If the protection circuitry triggers repeatedly and you are unable to isolate
and correct the faulty condition, contact your authorized Rotel dealer for
assistance in troubleshooting.

Input Signal Connections w

See Figure 3
NOTE: To prevent loud noises that neither you nor your speakers will
appreciate, make sure the system is turned off when you make any
signal connections.

Phono Input w and Ground Connection (GND)

Plug the cable from the turntable into the appropriate left and right phono
inputs. If the turntable has a "ground" wire, connect it to the screw terminal
to the left of the Phono inputs. It will help prevent hum and noise.

Line Level Inputs w

The CD, Tuner, and Aux inputs of the amplifier are "line level" inputs. These
are for connecting components such as CD players or other audio playback
devices with an analog audio output.
RA-630 Stereo Integrated Amplifier
The Left and Right channels are labeled and should be connected to the
corresponding channels of the source component. The Left connectors
are white, the Right connectors are red. Use high quality RCA cables for
connecting input source components to the unit. Ask your authorized Rotel
dealer for advice about cables.

Digital Signal Inputs rt

See Figure 3
There are two sets of digital inputs labeled COAXIAL and OPTICAL. Connect
the COAXIAL or OPTICAL outputs of your player into these sockets. The
digital signals will be decoded and played by the amplifier. The unit is
capable of decoding PCM signals up to 24 bit, 192kHz.

Preamp Outputs e

The amplifier has a set of preamp outputs. The currently selected source
input is available from this output. Typically the PRE OUT output is used to
provide a signal to another integrated amplifier or power amplifier, which
is used to drive remote speakers.
NOTE: Changes to the settings of the Volume, Balance or Tone controls
affect the signal from the Preamp Outputs.

Speaker Outputs y

See Figure 3

Speaker Selection

The speakers may have an impedance as low as 4 ohms when be used
at any given time. Speaker impedance ratings are less than precise. In
practice, very few loudspeakers will present any problems for the unit. See
your authorized Rotel dealer if you have any questions.

Speaker Wire Selection

Use insulated two-conductor stranded wire to connect the unit 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.