Assessments - 4, GPA: 3.8
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If the circuit breaker opens repeatedly, have the amplifier checked by a qualified service person. 24. AC LINE IN: Firmly insert the supplied AC power cord into this socket until it is fully seated. Plug the male end of the cord into a grounded AC outlet. DO NOT DEFEAT THE GROUND PRONG OF THE AC PLUG! 25. SPEAKER OUTPUTS: The 1/4” jacks offer a convenient method of connecting to speaker cabinets using cables terminated with 1/4” plugs. However, when using the amplifier at or near its full output power, using the five-way binding posts (domestic units) or Speakon® jacks (export units) is recommended. The binding posts/Speakon® jacks must be used when operating in the Mono Bridged mode. (See pages 8 and 9.) 26. FULL RANGE/BIAMP: This switch determines how the signal is sent to the internal amplifiers. In the Full Range position (switch out), a full range signal is sent to both amp channels. In the Biamp position (switch in), the low frequencies are sent to Channel A and the high frequencies are sent to Channel B. (See pages 8 and 9.) NOTE: When Biamping, the Stereo/Mono switch (#27) must be set to Stereo. (See pages 8 and 9.) 27. STEREO/MONO: This switch sets the operating mode of the amplifier. In the “out” position the amplifier is in the Stereo Mode; with the switch in the “in” position the amplifier is in the Mono Bridged Mode. (See pages 8 and 9.) 28,30. POWER AMP INPUTS: These jacks connect directly to the power amp for use with external preamps. When using external sources, connect the OUTPUT of the sources to these jacks using shielded instrument cables to feed the signals into the power amp sections. The internal signal is disconnected when a plug is inserted. In the Mono Mode, Channel A = Input. In the Biamp Mode, Channel A = Low Input, Channel B = High Input. (See pages 8 and 9.) 29,31. PREAMP OUTPUTS These jacks are direct preamp outputs for use with external power amplifiers, mixing boards, external effects, etc. Connect the external unit inputs to these jacks using shielded instrument cables. Speakon® is a registered trademark of Neutrik AG. B4R Bass Amplifier The Rear Panel – Con’t. 33 343536 37 38 39 40 41 BI-AMP KER UTS POWER AMP B FT. SW. LINE OUT EFFECTS LOOP H UT TUNER OUT LOW OUTPUT LEVEL CHANNEL A POWER AMP INPUT GRAPHIC EQ/ MUTE PREAMP OUTPUT POWER AMP A CHANNEL A OHMS, STEREO OHMS, STEREO UM LOAD S, MONO BRIDGE UM LOAD UNBAL.BAL. SENDRETURN GND LIFT PRE/ POST STEREO MONO FULL RANGE BI-AMP B4R O GE PREAMP OUTPUT + POWER AMP INPUT BIAMP LOW/ MONO BRIDGE INPUT BIAMP HIGH INPUT 1+ HOT, 1 1+ HOT, 1 CH. B CH. A 28 29 30 31 3226 27 32. FOOTSWITCH: Connect a two button footswitch to this jack for remote Mute and EQ On/Off control. On the stereo 1/4” plug, the tip controls Mute and the ring controls EQ On/Off. When a footswitch is connected, the Mute switch (#3) can still be used; however, the EQ switch (#12) is disabled. 33. BIAMP HIGH/LOW OUTPUTS: When using the amplifier in the biamp mode, the Biamp High Out jack carries the high frequency signal and the Biamp Low Out jack carries the low frequency signal. (See pages 8 and 9.) 34. LINE OUT LEVEL: This controls the strength of the signal at the Line Out jacks (#37,38) and works independently from the Master control (#14). 35. LINE OUT PRE/POST SWITCH: The signal at the Line Out jacks can be set to either Pre or Post EQ with this switch. With the switch in the OUT position, the signal at the jacks will be Pre-EQ. This is a direct output not affected by any preamp tone settings. With the switch IN, the signal is Post- EQ and is controlled and modified by the tone controls, Graphic EQ and the effects loop. 36. LINE OUT GROUND LIFT: This switch disconnects the ground pin of the line Out XLR jack (#37), which may help reduce residual hum and buzz sometimes picked up in line out signal cables. The ground is lifted when the switch is depressed. 37,38. LINE OUT JACKS: These jacks supply a pre-Master, line level signal for connection to a house mixing board, recording console or external amplifier(s). The XLR-type jack (#37) provides a balanced signal; the 1/4” jack (#38) provides an unbalanced signal. The signal level at these jacks is controlled by the Line Out Level control (#34) and is governed by the Pre/Post switch (#35). 39. EFFECTS LOOP RETURN: When using external effects, connect the effect’s output into this jack using a shielded instrument cable. 40. EFFECTS LOOP SEND: When using an external signal processor, connect this jack to the input of the effect using a shielded instrument cable. 41. TUNER OUT: This jack is provided for connection to an electronic tuner and is always “live,” even when the Mute switch (#3) is engaged, allowing for “silent tuning” as well as a monitor feed which remains active when the house mix is muted. 8 Connections: In the example shown below, the B4R’s two internal power amplifiers are bridged together to produce maximum output power. Set the Stereo/Mono Bridge switch to the IN (Mono Bridged) position and connect...