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In step #4 on the previous page, we recommended that you begin with both knobs at their midway“5”setting, but the two Pre-Amp knobs can in fact be set to any blend you like. However, you will usually want to avoid setting both to their maximum “10” position since this setting will almost always result in undesirable distortion. 8. When you have settled on a Pre-Amp balance, the next step is to adjust the two Contour (bass and treble equalizer) controls to taste. For more information, see the “About Equalization” section on page 13 of this manual. When you get a great setting that complements your instrument and playing style, it’s a good idea to write it down for future use. 9. Next, experiment with the Model VX2515/VX2510 graphic equalizer. Begin by setting each of the ten sliders to their flat “0” center detented position. Then press in the In/Out switch (to its “In” position) so that the graphic equalizer is activated. Finally, move each slider in turn as you play your bass. For more information, seethe “AboutEqualization” sectiononpage13ofthismanual. Again,when you get a graphic equalization setting that complements your instrument and playing style, it’s a good idea to write it down for future use. 10. Now try out the Model VX2515/VX2510 compression circuitry. Activate it by turning the Compression knob clockwise from its “Off” position (you’ll hear a click when it is activated). As you turn the knob clockwise, the input signal from your bass becomes more and more severely compressed—you’ll hear peak signals (such as string slaps and pulls) begin to sound increasingly “squashed,” relative to the lower-level signals produced by standard playing. The result will be a decreased dynamic range but an overall leveling of signal throughout the full pitch range of your instrument. For more information, see the “About Compression” section on page 15. In the Model 2500, the Compression LED will light steadily green when no compression is being applied, will go out whenever small amounts of compression are being applied and will flash or light steadily red when limiting (severe compression) is being applied. 11. If you’re using an external signal processor, turn your Hartke amplifier off momentarily and then connect a standard audio cable between the Effect Send jack and your effects processor input and another standard audio cable between the Effect Return jack and your effects processor output (if required, multiple effects processors can be daisy-chained together, output to input). Then turn the amp back on and play your bass while adjusting the controls of your outboard effects processor(s). For best results, set both the input and output gain of all connected effects processor(s) to 0 dB (unity gain), so that there is no increase or decrease in level whether the effects are switched in or out. If you have followed all the steps above and are still experiencing difficulties, call Samson Technical Support (516-932-1062) between 9 AM and 5 PM EST. * For more information on the use of the Hartke 2500 effect Balance control, see page 10 in this manual. PRE AMP 543210678910543210678910A B TUBE SOLID STATE CONTOUR 03515-18351015+180351015-18351015+18LOW PASS HIGH PASS IN OUT +15+12+9+6+3+2-2-3-6-9-12-15+150-158KHz5KHz3KHz2KHz1KHz500Hz250Hz125Hz64Hz30Hz8KHz5KHz3KHz2KHz1KHz500Hz250Hz125Hz64Hz30HzGRAPHIC EQUALIZER COMPRESSION 5432106789. Model2500EffectSend/Returnjacks 9 About Equalization CONTOUR 03515-18351015+180351015-18351015+18LOW PASS HIGH PASS Contour controls IN OUT +15+12+9+6+3+2-2-3-6-9-12-15+150-158KHz5KHz3KHz2KHz1KHz500Hz250Hz125Hz64Hz30Hz8KHz5KHz3KHz2KHz1KHz500Hz250Hz125Hz64Hz30HzGRAPHIC EQUALIZER Graphic equalizer The Hartke Systems Model 2500 Bass Amplifier gives you enormous control over shaping the sound of your bass, using a process called equalization. To understand how this works, it’s important to know that every naturally occurring sound consists of a broad range of pitches, or frequencies, combined together in a unique way. This blend is what gives every sound its distinctive tonal color. EQ controls allow you to alter a sound by boosting or attenuating specific frequency areas—they operate much like the bass and treble controls on your hi-fi amp, but with much greater precision. The Model 2500 provides you with two different means for equalizing your bass sound: • Low Pass and High Pass Contour controls provide 18 dB of cut or boost in two broad frequency bands. • A Graphic Equalizer provides 15 dB of cut or boost in ten narrow frequency bands. Normally, you will adjust the two Contour controls before “fine-tuning” your EQ with the Graphic Equalizer. The Low Pass Contour control affects a broad band of frequencies with 100 Hz as the center point; similarly, the High Pass Contour control affects a broad band of frequencies with 10 kHz as the center point. When either is in its center detented position (“0”), it is having no effect. When it is moved right of center, the particular frequency area...

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