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9. LIMITER: The B2/B2R uses an internal Optocoupler Limiter to assist in keeping the power amplifier’s output “clean” at extreme volume levels. (All amplifiers begin to clip their output signals as they approach maximum output levels, resulting in distortion which may damage your speakers.) To engage the Limiter, depress the Limit switch. Whenever the amplifier is at full power, the adjacent LED will flash. This is an indication that the limiter is keeping peak signals from clipping the output. NOTE: Playing at full power with the Limiter off will give you increased output power, but the sound may be distorted. Use discretion when playing without the Limiter. 10. EQ ON SWITCH: Depress this switch to activate the Graphic EQ. The adjacent LED illuminates when the EQ is on. 11. GRAPHIC EQ: These sliders control the output of the frequencies indicated above each control. The center position of each control is flat (no boost or cut). 12. POWER ON LED: This LED indicator illuminates when the POWER switch (#13) is ON. 13. POWER SWITCH: This heavy-duty rocker switch applies the power to the amplifier. The amp is ON when the top of the switch is depressed, OFF when the bottom of the switch is depressed. B2/B2R Bass Amplifier The Rear Panel MODEL: SERIAL: LINE: V ~ Hz WATTS: MAX B2R Q2ZZ650022 120 60 15 16 18 19 20 21 23 242214 17 14. FAN: This temperature controlled, variable speed fan draws cool air into the amplifier, which forces heat out through the exhaust vents. Never block the vent holes or the fan opening. 15. FUSE: This protects the unit from damage due to overload conditions or power line surges. If the fuse blows, replace it only with the same size and type. 16. 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! 17. SPEAKER OUTPUTS: Use these jacks to connect the amplifier to your speaker(s) using cables terminated with 1/4” connectors. For the B2 combo, use the supplied speaker cable to connect the output of the amplifier to the speaker jack. An extension speaker with an impedance of 8 ohms or higher may be connected and allows the amplifier to deliver its maximum power. NOTE: In some areas 1/4” jacks are not acceptable for use as extension speaker jacks. For this reason the 1/4” jacks on your amplifier may be factory-sealed. In such cases use the Speakon® jack to connect to external speaker cabinets. For the B2R, connect the output(s) using high quality speaker cables. NOTE: When connecting multiple speaker cabinets to the B2/B2R, keep the overall impedance at or above four ohms! The following chart shows the total impedance load when connecting speaker cabinets in parallel: Cabinet # of Total Impedance Cabs Impedance 8. 2 4. 16. 2 8. 16. 4 4. 18. POWER AMP IN: This mono jack allows you to feed the preamp output of another amplifier to the input of the B2/B2R’s internal power amp. This bypasses the preamp circuitry of the B2/B2R. WARNING: This jack goes directly into the power amplifier. DO NOT connect high level signals to it! 19. PREAMP OUT: A post-EQ signal may be taken from this jack and sent to the house mixing board, recording console or external power amplifier. 20. EFFECTS RETURN: To use an external effects device, connect the OUTPUT of the device to this jack by means of a shielded cable. This feeds the processed signal into the Master section of the B2/B2R. 21. EFFECTS SEND: Connect the output from this jack to the INPUT of your effects by means of a shielded cable. This sends a post-EQ signal to your effects. 22. -20dB SWITCH : This switch adjusts the output level at the Balanced Line Output jack (#24). The control works independently from the front panel Master control. Depressing the switch activates the 20dB pad. The result is a signal that is more compatible with the microphone inputs on a mixer. 23. PRE/POST SWITCH: You can select either Pre or Post EQ for the signal at the Balanced Out jack (#24) 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 EQ or boost settings. With the switch depressed, the signal is Post-EQ and is controlled and modified by the tone controls, Graphic EQ, and Effects Loop. 24. BALANCED OUTPUT: This XLR-type connector supplies a balanced preamp output signal for connecting to a house mixing board, recording console or external amplifiers with balanced inputs. The signal can be set to Pre or Post EQ by the back panel Pre/Post switch (#23). The level can be adjusted for either mic or line type inputs using the -20dB switch (#22). Speakon® is a registered trademark of Neutrik USA -15dB PEAK PAD GAIN BASS ULTRA MID TREBLE MASTER -15dB PEAK PAD GAIN BASS ULTRA MID TREBLE MASTER -15dB PEAK PAD GAIN BASS ULTRA MID TREBLE MASTER -15dB PEAK PAD GAIN BASS ULTRA MID TREBLE MASTER 6 Some Suggested Settings Rack Mounting (B2R only) JAZZ: ROCK:...

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