About Compression
The dynamic rangeof a sound is the difference between its loudest and softest points.
For example, as you play your bass, youOll probably find that some notes (for example,
notes played on the upper frets of the lowest string) are considerably louder than others.
The function of the compressor in the Model 1400/1415 Bass Amplifier is to reduce over-
all dynamic range by automatically attenuating the loudest sounds input so that they are
closer in level to softer onesN the end result is that the sound Oevens out� and all notes
played have pretty much the same level.
When you press in the OCompression� switch on the front panel, this automatic circuitry is
COMPRESSIONengaged and the loudest sounds you play (those that might cause 1% or more of Total
Harmonic Distortion) are reduced in level so that they more closely match the level of
softer soundsN when this occurs, the Compression LED will flash. Very loud sounds will
COMPRESSION OFFONbe limitedN this is a more severe form of compression, whereby the output remains virtu-
ally constant regardless of input. When this occurs, the Compression LED will light
steadily.
Compression has three main uses. First, as just described, it Oevens� out the notes
played by your bass so that they all appear at virtually equal level. Second, it adds
Opunch� 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 loud-
speakers from damage as a result of brief (transient) high output levels, as might be
caused by finger-popping or other performance techniques. The Model 1400/1415 com-
pression circuit uses a function called soft clippingto prevent sounds from overloading
the amplifier outputN this, in turn, serves to prevent connected speakers from producing
distorted, hard clipped sound.
Whether or not you need to use compression with your Model 1400/1415 will be a matter
of personal taste and playing styleN experiment and see if you like the effect. If you usu-
ally play at low Volume levels, youOll find that, even with the Compression switch in, the
Compression LED doesnOt flash or light at allN in this case, the circuitry isnOt being used
anyway, so it might as well be off. In general, if you donOt need compression, leave it off.
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ACEC
