Manual Hartke HA5500 (page 16 of 72) (English, German, French, Italian, Spanish)

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About Compression

Model 3500/5500

Compression control and LED

The dynamic range of a sound is the difference between its loudest and softest

points. For example, as you play your bass, you’ll probably find that some notes

(for example, notes played on the upper frets of the lowest string) are consider-

ably louder than others. The function of the Compression circuitry in the Model

3500/5500 Bass Amplifier is to reduce overall dynamic range by automatically

reducing the level of the loudest sounds you play so that they are closer in level

to softer ones—the end result is that the sound “evens out” and all notes played

have pretty much the same level.

The front-panel Compression control determines the amount of compression

(peak signal reduction) by simultaneously adjusting both threshold and compres-

sion ratio (which ranges from 2:1 to infinity [limiting]). At the fully counterclock-

wise “Off” position, the circuitry is bypassed and no compression is applied (the

knob clicks when set to the “Off” position). 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 3500/5500 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. When flashing red, the compres-

sion ratio is approaching infinity (limiting is being applied). When lit steadily red,

the signal is being limited. This LED “follows” the incoming signal, changing con-

tinuously as different amounts of compression and/or limiting are being applied.

Compression has three main uses. First, as just described, it “evens” out the notes

played by your bass so that they all appear at virtually equal level. Second, it adds

“punch” to a sound; since all levels are nearly the same, you can play with greater

force without worrying about the loudest notes distorting. Finally, it serves to

protect your loudspeakers from damage as a result of brief (transient) high output

levels, as might be caused by finger-popping or other performance techniques.

Whether or not you need to use compression with your Model 3500/5500 will

be a matter of personal taste and playing style—experiment and see if you like

the effect. If you usually play at low volume levels, you’ll find that, even with the

Compression knob turned up, the compression circuitry may have no audible

effect, so it might as well be off. In general, if you don’t need compression, leave it

off.

ENGLISH

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Hartke HA5500 Manual

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