Lehle DC Filter

The Lehle DC Filter eliminates switching noise caused by DC offset - passive, transparent, and the kind of problem-solver you'll wonder how you lived without.

DC offset is one of those signal chain problems that's easy to overlook until it announces itself as an ugly switching noise at exactly the wrong moment. The Lehle DC Filter exists to solve it cleanly and permanently. Passive by design, no power supply required, it strips DC voltage from your analog signal without touching the audio itself. No coloration, no compromise, just a cleaner signal path.

The Filter handles mono, stereo, and balanced signals equally well, making it useful across a wide range of applications: acoustic preamps, bass preamps, effects processor outputs, tube amp inputs - anywhere an active circuit might be introducing a DC offset you can't hear until you switch. Placement is straightforward once you've identified the source, and Lehle's documentation walks you through the simple voltmeter test to locate it. If you're not sure where the offset is coming from, the DC socket faces the offending unit and the 0DC socket faces the next device in the chain - swap positions if needed and let the results guide you.

Small, passive, and genuinely useful. The kind of tool that earns a permanent spot in your kit the first time it saves a session.