The K&K Sound Pure Preamp is a compact external preamplifier designed to enhance the signal from acoustic guitar pickups and other passive transducers. It features a clean, low-noise circuit with three-band EQ controls (bass, mid, and treble) and an internal gain trim that lets you adjust the amplification from subtle to stronger boosts. Its wide-band midrange filter and high input impedance provide a natural, full-range response from 10 Hz to 30 kHz, making it especially effective with piezo pickups. Powered by a 9 V battery with long life and housed in a rugged belt-clip case, it delivers clarity, power, and simple tonal shaping in a small form factor.