User manual HARTKE SYSTEMS 3500

[. . . ] BASS AMPLIFIER Hartke Systems 2000/3500 Introduction 3 Features 4 Guided Tour 5 Model 2000 Front Panel Model 2000 Rear Panel Model 3500 Front Panel Model 3500 Rear Panel 5 7 9 11 Setting Up and Using the Model 2000/3500 13 About Equalization 15 About Compression 17 Appendix A: Impedance vs. Expected Power 18 Appendix B: Block Diagram 19 Appendix C: Changing the Model 2000/3500 Voltage 20 Specifications 21 Introduction Congratulations on purchasing the Hartke Systems Model 2000/3500 Bass Amplifier!Although these units are designed for easy operation, we suggest you first take some time to go through these pages so you can fully understand how we've implemented a number of unique features. The two models covered by this manual differ in the following ways: · The Model 2000 provides 200 watts of power (into 4 ohms), while the Model 3500 provides 350 watts of power (into 4 ohms). [. . . ] For information on how to change the voltage rating, see Appendix C on page 18. AC input - Connect the supplied standard 3-pin "EEC" plug here. Speaker outputs - Connect any 4, 8, or 16 ohm bass cabinet(s) to these standard unbalanced 1/4" jacks. WARNING: Because of the high power levels and low frequency content of the signal generated by the Model 3500, use only appropriately rated speaker cabinets (at least 400 watts at 4 ohms) that are specifically designed for bass instruments. We recommend that Hartke amplifiers be used with Hartke bass cabinets, although other brands of speakers can be used. Make sure that it is kept free of all obstructions and that cool, fresh air is accessible at all times. Also, try to ensure that the Model 3500 is used in a dust-free environment. 11 Guided Tour - Model 3500 Rear Panel 5. Effect Send jack - Use this 1/4" unbalanced jack to send low impedance (600 ohm) signal from the Model 3500 to a professional outboard effects processor such as a reverb, echo, chorus, flanger, or harmonizer device. * Output level is approximately 0 dB to +4 dB and is post-EQ and post-compression but unaffected by the setting of the Master Volume control. You can also use the Effect Send jack to route signal to an external mixing console or amplifier with an input sensitivity of +4 dB. Effect Return jack - Use this 1/4" unbalanced jack to return low impedance (600 ohm) signal to the Model 3500 from a professional outboard effects processor. * 7. Balance control - Use this to adjust the relative amount of Effect Send (dry) versus Effect Return (wet) signal being routed to the Model 3500 speaker outputs. At the center-detented "0" position, equal amounts of Send and Return signal are routed. At its fully counterclockwise ("Send") position, no signal from a connected effects processor(s) is added to the main output. At its fully clockwise ("Return") position, the only signal you hear is that coming from a connected outboard effects processor(s). If your outboard effects processor has an adjustable wet/dry control, we recommend that you set the Balance knob to its fully clockwise ("Return") position and use the effects processor's wet/dry control to adjust the relative mix. Alternatively, you can set the effects processor to output fully "wet" signal and use the Model 3500 Balance knob to adjust the relative mix of dry vs. Direct Out Post/Pre switch - When pressed in (the "Pre" position), signal is routed to the Direct Out jack prior to the Model 3500 ten-band graphic equalizer (but after the compression circuitry and Contour controls). When out (the "Post" position), signal is routed to the Direct Out jack after all compression and EQ circuitry (both ten-band graphic and Contour). ** Use the "Pre" position when you want the console engineer to have control over equalizing your bass signal; use the "Post" position when you want to use the front panel ten-band graphic equalizer to equalize your bass signal before sending it to the console. Direct Out Normal/Ground Lift switch - When pressed in (the "Gnd. This should be used only when a ground loop hum or buzz is heard; otherwise, leave it in the out ("Normal") position. Direct Out jack - Use this electronically balanced XLR jack to route signal from the Model 3500 to a professional mixing console or as a tap to a main PA system via a mic input on the console. The signal output from this jack is low impedance (600 ohm) with an output level of approximately -30 to -20 dB. [. . . ] As the knob is raised clockwise (at settings from "1" to "") increasing amounts of compression is applied. At the highest settings, loud sounds will not just be compressed, but limited, where the output remains virtually constant regardless of input. The Model 3500 provides a front-panel Compression LED which acts as a useful visual indicator of the continuous activity of the compression circuitry. When lit steadily green (for example, when the Compression knob is set to "Off"), no compression is being applied. [. . . ]