EarthQuaker Devices Speaker Cranker Overdrive
The Speaker Cranker is a discrete, all-analog distortion enhancement device (i.e., not a booster), designed to give your signal some extra grit and a slight boost without drastically altering your tone. Think of it as sticking an extra preamp tube in your amplifier for more overdrive.
Single notes will blossom and bloom with rich harmonics and responsive, tube-like sag. Power chords will sound thicker and crunchier, a little more ragged around the edges. Complex chords will remain distinct and complex, as the Speaker Cranker is designed to preserve your tones integrity without muddying up the low-end, sorrounding out the mids, or adding any top-end shimmer,or sparkle, or any of that other garbage. Its your tone. Cranked. Ya got that
Repeat after me: The Speaker Cranker is an overdrive, not a boost.