The Mackie MDB-1P is a passive direct box designed to connect a single instrument such as a guitar, bass, or keyboard to a microphone preamp for musicians and audio engineers in recording sessions, houses of worship, and live stage applications. It converts a high-impedance, instrument-level signal via its 1/4" TS unbalanced input to a low-impedance, mic-level output via its balanced XLR 3-pin jack. A 1/4" thru jack allows simultaneous connection to an amplifier or pedalboard.

A -15 dB pad reduces the input level to prevent distortion when using a high-gain source, and the ground-lift switch inhibits hum caused by ground loops. Due to its passive design, the MDB-1P requires no batteries or power supply. A sturdy steel chassis enables confident use in the studio or on the road.

• ✔️ Connect an instrument such as a guitar, bass, or keyboard to a microphone preamp
• ✔️ Converts a high-impedance, unbalanced 1/4" input to a low-impedance, balanced XLR mic-level output
• 1/4" thru jack for routing to an amplifier
• ✔️ -15 dB pad prevents overloading when accepting signal from a loud source
• ✔️ Ground-lift switch minimizes hum
• ✔️ Passive design requires no batteries or power supply

• ✔️ Connect an Instrument to a Mic Input
• ✔️ Converts Unbalanced to Balanced
• ✔️ Converts High Impedance to Low Impedance
• ✔️ 1/4" Unbalanced Input