User manual AKAI GX-365 SERVICE MANUAL

[. . . ] · The Model 3500 offers a number of additional advanced features, including front-panel compression and graphic equalizer LED indicators, effects send and return jacks, an effects send/return balance knob, and a direct output with ground lift and pre or post EQ selection. Both models are optimized for use with electric bass instruments, and the front panel controls in both models are virtually identical. You'll find either to be an excellent bass amplifier for live performance use in small and medium-size venues; in addition, the Model 3500's advanced features makes it ideal for use in recording environments. In these pages, you'll find a detailed description of the many features of the Model GX-365/3500 Bass Amplifiers, as well as a guided tour through their front and rear panels, step-by-step instructions for setting up and using each product, detailed discussions about equalization and compression, and full specifications. [. . . ] Power switch - Use this to power the Model 3500 on or off. 10 Guided Tour - Model 3500 Rear Panel 1 3 4 5 8 9 Hartke Systems Distributed Exclusively by Samson Technologies Corp. Hicksville, New York 11802 115 SPEAKER OUTPUTS EFFECT SEND DIRECT OUT POST PRE NORMAL GND LIFT MODEL 3500 350 WATTS 8 = 240 WATTS 4 = 350 WATTS CAUTION TO PREVENT SHOCK, DO NOT OPEN. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL. TO PREVENT FIRE OR SHOCK HAZARD, DO NOT EXPOSE TO RAIN OR MOISTURE. SERIAL NUMBER ~ AC INPUT 115V/230V 50/60Hz FUSE 8A/250V, 300W (115V) 4A/250V, 740W (230V) 8 RETURN BALANCE 0 8 SEND RETURN 2 3 6 7 10 1. Fuse sled - This contains a fuse holder and shows the currently selected voltage rating for your Model 3500. Make sure the voltage rating is correctly set before powering up the amplifier!Fuse ratings are 8 amp for 115 vac and 4 amp for 230 vac. 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. ** Note that the settings of the ten-band graphic equalizer will affect a "Post" Direct Out signal regardless of the position of the front panel In/Out switch. 12 Setting Up and Using the Model GX-365/3500 Setting up your Hartke Systems GX-365/3500 Bass Amplifier is a simple procedure which takes only a few minutes: 1. Remove all packing materials (save them in case of need for future service) and decide where the amplifier is to be physically placed. To avoid potential overheating problems, be sure that the rear panel is unobstructed and that there is good ventilation around the entire unit, particularly behind the rear-panel fan. Begin by hooking up your bass cabinet or cabinets, using the 1/4" unbalanced Speaker output connectors on the rear panel; it is never a good idea to power up any amplifier that is not connected to loudspeakers. We recommend the use of a single 4 ohm cabinet or two 8 ohm cabinets. Hartke amps are optimized for use with Hartke bass cabinets, although other brands of speakers can be substituted. Any appropriately rated bass cabinet with a minimum impedance of 4 ohms (that is, 4 ohms or greater) can be used. In order to ensure correct phase correlation, the tip of the Model GX-365/3500 speaker jack should be connected to the "+" (hot) input of your loudspeaker, and the sleeve of the Model GX-365/3500 speaker jack should be connected to the "-" (ground) input of your loudspeaker. WARNING: Hartke amplifiers can deliver very high power levels. Driven to full power, they can damage connected loudspeakers, regardless of brand, size, or configuration. Care should be taken not to strain connected loudspeakers as this can cause permanent damage and will degrade the performance of the entire system. [. . . ] 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. When unlit, compression is being applied to the incoming signal at a ratio of approximately 2:1. [. . . ]