Advanced Audio Designs was a small Eugene, Oregon-based manufacturer of rackmount instrument preamps, active from the mid-1970s through the early 1980s. The company built hand-assembled 1U preamps for guitar and bass, including the Guitarist 101 and the Bassist 101B, each featuring two cascaded preamp stages, a switchable three-band EQ, low and high frequency boost switches, and balanced and unbalanced outputs.

The units were solid-state designs aimed at players looking to shape tone and overdrive outside of a traditional amp head, with a bi-amp-capable "B" variant of the 101 sharing the same chassis and control layout as the guitar model. Specs published on the 101B list a frequency response of ±1.5 dB from 30 Hz to 22 kHz, a 2-volt RMS rated output into 500 ohms or higher, and hum and noise 70 dB below rated output.

Production was limited and the company is no longer operating, so the preamps turn up mainly on the used market through sites like Reverb and eBay. The Guitarist 101 is most commonly associated with Rush guitarist Alex Lifeson, whose use of the unit is frequently cited in listings and forum discussions of the brand.

Advanced Audio Designs has 1 product cataloged on Equipboard, including Effects Processors. Their gear is featured by 1 artist, with the strongest followings in Electronic and Hip Hop. Notable users include quickly, quickly.