The DOD FX40B is a vintage 7-band graphic EQ pedal recognized for its durable construction and powerful tonal shaping capabilities. This pedal allowed guitarists and bassists to boost or cut specific frequency ranges to sculpt their sound.

Compared to other EQ pedals, the FX40B is often noted for being quieter, having a greater boost/cut range, and delivering a cleaner sound. It features seven octave-band sliders for precise tone adjustment, with adjustable frequencies at 100 Hz, 200 Hz, 400 Hz, 800 Hz, 1.6 kHz, 3.2 kHz, and 6.4 kHz. Each frequency band can be boosted or cut by up to 12 dB using the respective sliders. Additionally, a separate slider controls the overall output level, which allows for a clean volume boost.

The pedal’s tone-shaping power is useful for various applications, including tone sculpting (creating specific sound profiles), feedback elimination, and lead boosting (enhancing mids and volume to cut through the mix during solos). The FX40B is the successor to the earlier DOD FX40 equalizer, which was released in 1983.

Early models of the FX40B featured a light gray casing with red graphics, while later versions switched to a metallic brown-and-light grey color scheme in the mid 80’s, then with a white silkscreen in the later 90’s. This pedal was made in the USA and was sold throughout the 1990s until they were discontinued in 1999.