CurvOmatic FT501 - Resonant LP/HP Filter Set with Baxandall Tone Tipper EQualization
The CurvOmatic module is a versatile set of high and low pass variable resonance sweep filters combined with a very sweet sounding version of Peter J. Baxandall's classic 1950 tone control circuit.
Used in combination these provide a surprising amount of tone carving and shaping capability that is unlike anything you can get from standard equalizers and cutoff filters. Each section (lo pass, hi pass and tone tipper) has a switch that bypasses or removes that section. There is a "hard" bypass "BYP" that connects the module input directly to the output.
The frequency sweep ranges on the hi and lo pass filters overlap from 160Hz to 2,700Hz, and covering the entire audio spectrum of 22Hz to 22,000Hz between them. The resonance controls vary from 3dB to 15dB of peak at the Hi Pass filter cutoff and 0dB to 12dB of peak at the Low Pass filter cutoff.
The ganged ToneTipper EQualization circuit is a non-shelving tone control which is very organic and natural sounding. Turn its knob clockwise to boost treble while attenuating bass, and turn counterclockwise to boost bass while attenuating treble. The advantage of this type of tone control is that the curves are smooth and continuous so the rise or fall of energy is consistent across the entire spectrum as opposed to a shelving type control that simply lifts up a plateau of energy in one part of the spectrum or depresses a flat valley in another.
The CurvOmatic is transformer-balanced in and out. The output is capable of driving loads as low as 300 Ohms, while the input can take very high levels without overloading. Internal operating level is very low, allowing for max boost without clipping. All five rotary controls are continuously adjustable for fine tuning.
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