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manual abstract
Adjust the Gain control (#5) until a strong signal from your instrument causes this LED to flicker. When the Mute function is engaged this LED remains fully illuminated. NOTE: If the LED flashes frequently with the gain at a low setting, use the Pad switch (#3) to attenuate the input signal and readjust the Gain (#5). 5. GAIN: Use this control to adjust the input level of the amplifier. For the best signal-tonoise set this control so the Peak/Mute LED (#4) flashes when you strike a string fairly hard. 6. BASS: This is the primary low frequency control. It allows for a range of 8dB of boost or 18dB of cut at 50Hz. 7. ULTRA-MID: The primary midrange control. Rotate the control to the left of center for a “contoured” sound (more distant, less midrange output) or to the right of center for a sound which really cuts through. 8. TREBLE: This is the primary high frequency control. It allows for a range of 12dB boost or 24dB of cut at 5kHz. 9. MASTER: Set the overall output level of the amplifier with this control. The Effects Loop and Balanced Out (#23-27) are not affected by the Master control. 10. LIMIT: The BA500 uses an internal Optocoupler Limiter to assist in keeping the power amplifier’s output “clean” at extreme volume levels. (All amplifiers may begin to clip their output signals as they approach maximum output levels, resulting in potentially damaging distortion.) To engage the Limiter, depress the Limit switch. The adjacent LED illuminates whenever the limiter circuit is activated. This indicates that the amplifier is nearing full output and 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. 11. EQ ON: Depress this switch to activate the Graphic EQ. The adjacent LED illuminates when the EQ is on. When a footswitch is used (see #19, rear panel) this switch is disabled. 12. GRAPHIC EQ: These sliders control the output of the frequencies indicated below each control. The center position of each control is flat (no boost or cut). 13. ON LED: This LED indicator illuminates when the POWER switch (#14) is ON. 14. POWER: 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. The Rear Panel BA500 Bass Amp Combo 15 16 17 18 21 2219 20 23 24 25 26 27 15 16 17 18 21 2219 20 23 24 25 26 27 15. FAN: The temperature controlled, variable speed fan pulls cool air through the amplifier’s intake vents, forcing heat out through the fan. Never block the air intake holes or the fan opening. NOTE: It is not uncommon for the fan to remain off when the amplifier is first powered up. 16. FUSE: The fuse protects the unit from damage due to overload conditions or power line surges. If the fuse fails, replace it only with the same size and type. 17. AC LINE IN: Firmly insert the female end of the supplied AC power cord into this socket. The grounded power cord should only be plugged into a grounded power outlet that meets all applicable electrical codes and is compatible with the voltage, power, and frequency requirements stated on the rear panel. Do not attempt to defeat the safety ground connection. 18. SPEAKERS: Use these jacks to connect the amplifier to your speaker(s) using cables terminated with the appropriate connectors. Always use high-quality speaker cables for these connections. NOTE: When connecting multiple speaker cabinets to the amplifier, keep the overall impedance at or above two ohms! The BA500’s internal speakers count as one four ohm cabinet. The following chart shows the total impedance load when connecting speaker cabinets in parallel: Cabinet # of Total Impedance Cabs Impedance 4. 2 2. 8. 2 4. 8. 4 2. 16. 2 8. 16. 4 4. 19. FOOTSWITCH: Use this jack to connect a two-button footswitch for remote control of the Mute and Graphic EQ. Tip = Mute, ring = EQ, sleeve = ground. When a footswitch is used the corresponding front panel switches (#2 and #11) are disabled. 20. POWER AMP IN: This mono jack allows you to feed the preamp output of another amplifier to the input of the BA500’s internal power amp. This bypasses the preamp circuitry of the amplifier. 21. TUNER OUT: Use this jack to send a signal to an electronic tuner. This jack is always “live,” even when the Mute switch (#2) is engaged, allowing for “silent tuning” as well as a monitor feed which remains active when the speakers are muted. 22. 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. 23. EFFECTS LOOP RETURN: To use an external effects device, connect the OUTPUT of the device to the Return jack by means of a shielded cable. This feeds the processed signal into the Master section of the BA500. 24. EFFECTS LOOP SEND: Connect the output from the Send jack to the INPUT of your eff...