User manual ROTEL RB-956AX

[. . . ] RB-951 MkII POWER CONSUMPTION: 200W BRIDGED MONO NORMAL STERO BRIDGED SIGNAL OUTPUT LINK RB-951 MkII 5 English WARNING: There are no user serviceable parts inside. WARNING: To reduce the risk of fire or electric shock, do not expose the unit to moisture or water. If the unit is exposed to moisture, or a foreign object gets into the enclosure, immediately disconnect the power cord from the wall. Take the unit to a qualified service person for inspection and necessary repairs. [. . . ] These modes are selectable using a threeposition slide switch on the back panel as follows: · With the switch in the OFF position, the amplifier is turned on or off manually using the front panel power switch. Also use this mode if you are using a switched AC outlet to control power to the amplifier. · With the switch in the SIGNAL SENSING position, the amplifier turns on automatically when a signal is sensed at the inputs. The amplifier will go into standby mode five minutes after no signal is present. Turning the switch OFF cuts power to the amplifier, regardless of whether or not a signal is present. IN position, the amplifier is turned on automatically when a 12 volt trigger signal is present at the screw terminals adjacent to the left of the switch. The amplifier will go into standby mode if the +12 volt signal is not present. Turning the switch OFF cuts power to the amplifier, regardless of whether or not a trigger signal is present. Operating Features · Two-channel Stereo or Bridged Mono operation (back panel switchable) · Optional Parallel Mono operation for driving low impedance multi-speaker loads in custom installation applications (requires resetting internal jumpers). · User-selectable power on/off configuration: manual, automatic signal sensing, or controlled by remote 12 volt trigger signal. · Front panel input level controls · Protection circuitry with front panel indicators · Front panel clipping indicators AC Power and Control AC Power Input The RB-951MkII is supplied with the proper AC power chord. A heavy duty multi-tap power outlet strip may be used, but only if it is rated to handle the current demanded by the RB-951MkII. Two recessed controls on the front panel, one for each channel, provide input level adjustments. These allow you to adjust the gain of the amplifier to match other components in an elaborate system. The CH1 level control changes the gain of the left channel; the CH2 level control changes the right channel. Turn counterclockwise to reduce gain. These controls may be disabled by resetting an internal jumper. NOTE: 9 English If you are using banana plugs, connect them to the wires and then plug into the backs of the speaker connectors. The collars of the speaker connectors should be screwed in all the way (clockwise). If you are attaching bare wires directly to the speaker connectors, separate the wire conductors and strip back the insulation from the end of each conductor. Place the connector lug around the shaft, or insert the bundled wire into the hole in the shaft. Turn the collars 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. Clipping Indicators Two front panel LEDs (one for each channel) flash to indicate when the amplifier is "clipping" or being asked to deliver more output current than it is capable of delivering. Occasional brief clipping on the loudest musical passages is acceptable. However, sustained or frequent clipping is one of the most common causes of speaker damage and should be avoided. Should this occur, either reduce the overall gain of the system by turning down the master volume control on your preamp. [. . . ] Give yourself enough slack so you can move the components enough to allow access to the speaker connectors. Speaker Selection The nominal impedance of the loudspeaker(s) connected to the RB-951MkII in the various operating modes should be: · Stereo mode: minimum 4 ohms · Bridged Mono mode: minimum 8 ohms · Parallel Mono mode: minimum 2 ohms When driving multiple pairs of speakers connected in parallel, 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, select speakers with a nominal impedance of 8 ohms or higher. RB-951 MkII Stereo Power Amplifier 10 Internal Jumper Settings for Custom Installation (see figure 1) There are internal jumpers that can be used to disable the front panel level controls, to select one of two input sensitivity settings, and to engage the special Parallel Mono mode for driving low impedance speaker combinations in custom installations. WARNING: Removing the top cover of the amplifier to access the jumpers may expose you to potentially dangerous voltages. The AC power cord must be removed from the amplifier before the top cover is removed. Input Sensitivity (S605 and S606) Jumper blocks S605 and S606 are used to set the input sensitivity of the amplifier. [. . . ]