Greg Hanks Design is a California-based boutique manufacturer of high-end tube outboard audio equipment, best known for the BA-660, a single-channel tube microphone preamplifier paired with a compressor/limiter section. The BA-660's limiter is voiced with a selection of presets intended to evoke the character of classic dynamics units such as the Fairchild 660, Teletronix LA-2A, RCA BA-6A, Neve 2254, and the SSL quad bus compressor, with an emphasis on wide dynamic range and class-A, all-tube signal path.

A companion model, the BA-AD660, pairs the preamp and limiter with an integrated analog-to-digital converter and master clock for direct tracking into digital systems. Build quality on both units is often described in professional audio circles as reference-grade, with hand-assembled construction and very limited production runs — the BA-660 in particular is considered a rare piece on the secondary market.

Greg Hanks Design units are sold primarily through specialty pro-audio dealers such as Vintage King and Retro Gear Shop, and have developed a reputation among engineers working in tracking and mastering applications for vocals, bass, and other sources where the combination of tube preamp warmth and program-dependent limiting is desired.

Greg Hanks Design has 1 product cataloged on Equipboard, including Preamps.