This is the Lehle DC-Filter from Lehle, listed in Specialist Effects Pedals on Just Pedals. Read More below.
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The Lehle DC Filter eliminates DC voltage from analog signals. Audio signals containing DC voltage cause ugly switching noise. Now, both line and high-impedance signals are cleaned – but with no loss of sound. The DC Filter is of full stereo type, and thus filters stereo – and, of course, mono – signals. This little aid can even process balanced signals. The Lehle DC Filter is a passive filter, so it needs no power supply.
Lehle is a high-end manufacturer of guitar pedals, known for their precision engineering and sophisticated signal routing capabilities. The brand is highly regarded for its innovative designs, particularly in the realm of volume pedals and signal processors. Their products, such as the Lehle Mono Volume S and Lehle Parallel SW II, are favoured by musicians for their transparency, tonal clarity, and durability. The Mono Volume S, for example, offers a smooth operation with low friction bearings and a boost function that can enhance the gain for specific tones. It also features programmable presets, a USB-C socket for calibration and updates, and a buffered direct output, making it versatile and highly functional for modern pedalboards.
Lehle pedals are built with high-quality components, including discrete Class-A input stages, which contribute to their excellent dynamic range and ability to handle various instruments, from electric guitars to keyboards. Their use of true-bypass circuits and advanced switching technology ensures minimal signal loss, allowing musicians to maintain the integrity of their sound even when switching between effects.
Specialist effects alter the signal in ways that do not sit cleanly inside one established family. They may use granular processing, frequency shifting, resonators, freeze or sustain, bit reduction, ring modulation, feedback networks or combinations of several techniques. The relevant distinction is the underlying process, its tracking or latency, and how completely the dry signal can be blended or replaced.
The signal is shaped by continuously varying electronic circuitry rather than being converted into a digital effect algorithm. Component choice, operating voltage and circuit tolerances influence headroom, noise, clipping texture and the small variations in response between designs.
Changes tone by allowing selected frequency regions to pass while attenuating others. Cutoff sets the transition point, resonance emphasises frequencies around it, and an envelope, treadle or modulation source can move that point to create vocal or sweeping motion.
Processes, creates or passes two audio channels. True stereo preserves separate left and right inputs, while mono-to-stereo effects generate spatial differences internally; routing, phase behaviour and whether trails remain stereo determine the resulting image. Some outputs sum to mono when only one socket is connected, which can change level or modulation depth.
