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The connector labeled OUT is for connecting another 3.5mm plug/cable to
provide a 12V trigger signal to other components. The 12V output signal is
available whenever a +12 volt trigger signal is applied to the IN connector.
Protection Circuitry
1
The RB-1590 features thermal and over-current protection circuits that
protect against potential damage in the event of extreme or faulty operating
conditions. Unlike many designs, these protection circuits are independent
of the audio signal and have no impact on sonic performance. Instead,
the protection circuits monitors the temperature of the output devices and
the current they are handling and shuts down the amplifier if operating
conditions 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 Power
Indicator on the front panel will blink.
If this happens, turn the amplifier off, let it cool down for several minutes,
and attempt to identify and correct the problem. When you turn the amplifier
back on, the protection circuit will automatically reset and the Power Indicator
should light up, indicating that the amplifier is turned on normal.
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 234
See figure 2 and 3
NOTE: To prevent loud, potentially damaging noises, make sure the amplifier
is turned off when you make any changes to the input signal configuration.
The RB-1590 has conventional RCA type input connectors, the type found
on nearly all audio equipment, as well as Balanced (XLR) input connectors.
Select high quality audio interconnect cables. Connect each of the outputs
from the preamplifier or signal processor to the corresponding input of the
amplifier.
Input Selector Switch
4
A toggle switch in the rear panel selects the type of input signal to use.
Select the correct inputs to use with this flip switch.
NOTE: You should choose only one method of analog connection from a
source component to the amplifier. Do not connect both the RCA and XLR
outputs of a source component to the same amplifier at the same time.
Speakers Connection 5
Speaker Selection
We recommend using loudspeakers with a nominal impedance of 4 ohms
or higher with the RB-1590. You should exercise some caution in driving
multiple pairs of speakers in parallel configuration, because the effective
impedance the amplifier sees is cut in half. For example, when driving two
pair of 8 ohm speakers, the amplifier sees a 4 ohm load. When driving
multiple speakers in parallel, it is recommended that you select speakers
with a nominal impedance of 8 ohms or higher. Speaker impedance ratings
are less than precise. In practice, very few loudspeakers will present any
problems for the RB-1590. See your authorized Rotel dealer if you have
any questions.
Speaker Wire Selection
Use insulated two-conductor stranded wire to connect the RB-1590 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 Connection
5
NOTE: The following text describes both binding post and plug-in
connections. DO NOT use both connection methods in combination to
connect multiple speakers.
Turn off all the components in the system before connecting the speakers.
The RB-1590 has four pairs of color coded binding posts, two for each
channel. These connectors accept bare wire, connector lugs, or dual banana
type connectors (except in the European Community countries where their
use is not permitted).
Route the wires from the RB-1590 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 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.
9
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