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Jim developed these high-power continuously variable L-pad attenuators as a means of controlling the overall volume of his amplifiers so that the output section could be overdriven at more modest sound pressure levels. One unique feature of these power attenuators is the remote footswitch which would allow the attenuator to be bypassed.
A treble booster is an effects unit used by guitarists to increase the high end of their tonal spectrum. Many units boost the overall volume as well. Many units boost the overall volume as well. Treble boosters were commonly used by guitarists in the 1960s and 1970s.
Unlike the Champion 600, which has a strictly all-tube audio signal path, the Vibro Champ XD's tube circuitry is complemented by a digital signal processor (DSP) that functions as a pre-amp by modelling 16 different amplifiers. The effect of the volume, gain and tone control knobs varies according to the selected amp model.
It had the ability to both amplify (boost) and attenuate (cut), unlike the earlier presence control. [6] In a 3-way loudspeaker system, with tweeter, woofer, and mid-range speaker, a presence control is simply a volume control for the mid-range speaker. [7]
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The decibel unloaded reference voltage, 0 dBu, is the AC voltage required to produce 1 mW of power across a 600 Ω impedance (approximately 0.7746 V RMS). [2] This awkward unit is a holdover from the early telephone standards, which used 600 Ω sources and loads, and measured dissipated power in decibel-milliwatts ( dBm ).
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Its function was two-fold: to increase the signal strength of the guitar going into the amplifier, and to increase tones at the high end of the spectrum (a treble booster). The need for a treble booster arose in the mid-1960s, as British tube amplifiers such as the Vox AC30 or Marshall JTM45 tended to produce a slightly dark, muddy sound when ...