Boss SD-1 4A Super Overdrive Limited Edition 40th Anniversary

Description

SD-1 Super Overdrive 40th Anniversary Limited Edition

To celebrate 40 years of continuous SD-1 production, we’ve created a limited-edition anniversary version, available throughout 2021. This commemorative pedal features a black body with yellow lettering, gold-capped knobs, and a vintage silver-screw battery compartment, and comes in a special box with a 40th-anniversary logo.

Since its introduction in 1981, the indestructible SD-1 Super Overdrive has become a core gain pedal for generations of players, across every musical genre. Based on the groundbreaking asymmetric clipping circuit of the OD-1 Overdrive—one of the three original BOSS compact pedals from 1977—the SD-1 delivers rich, smooth, and highly musical overdrive tones that continue to inspire guitarists everywhere.

● The genre-spanning BOSS overdrive sound

● Unique asymmetric clipping circuit produces tube-like overdrive characteristics

● Mild-to-medium distortion tones with focused midrange and tight, clear bass

● Ideal for use with clean and slightly overdriven amps

● Also great for adding tightness and definition to high-gain amp tones

● The perfect companion for boost, overdrive, and distortion pedals

● BOSS five-year warranty

The Clipping Circuit That Defined “Overdrive”

In 1977, BOSS created an entirely new stompbox category with the OD-1, bringing natural overdrive in pedal form to guitarists for the very first time. Producing a signal rich in even-order harmonics, its unique asymmetric clipping circuit replicates the pleasing sound and response of a driven tube amp, but at controllable volume levels. Four years later, this revolutionary design evolved into the more versatile SD-1, which added an active tone control to shape treble response and small improvements for more low-end body.

Overdrive Perfection

The SD-1 delivers instant inspirational sounds for beginners and pros alike, thanks to its natural behavior and the subtle mid-range emphasis that’s part of its design. It pushes your sound right where it counts, ensuring your guitar always sits perfectly in the mix with warmth, clarity, and rich presence. Low drive settings are excellent for rhythm playing, while higher settings are ideal for fat, singing solos. The SD-1 is also highly touch-sensitive, allowing you to create different shades of overdrive simply by adjusting your guitar’s volume.

The One Essential Pedal for Every Guitarist

With its organic character, precise-response Drive and Tone controls, the SD-1 creates the right sound for any musical style. Plug the pedal into your favorite clean or slightly overdriven amp for mild-to-medium overdrive, perfect for everything from classic rock and blues crunch to pop, country, jazz, and beyond. The SD-1 also shines as a booster for high-gain amps and other distortion pedals, with defined mids, tight lows, and a smooth treble range that’s perfectly suited for heavier rhythm tones and lead playing.

SD-1 Super Overdrive (SD-1-4A) 40th Anniversary Limited Edition

To celebrate 40 years of continuous SD-1 production, we’ve created a limited-edition anniversary version, available throughout 2021. This commemorative pedal features a black body with yellow lettering, gold-capped knobs, and a vintage silver-screw battery compartment, and comes in a special box with a 40th-anniversary logo.

Specifications

-Nominal Input Level

-20 dBu

-Input Impedance

1 M ohm

-Nominal Output Level

-20 dBu

-Output Impedance

1 k ohm

-Recommended Load Impedance

10 k ohms or greater

-Bypass

Buffered bypass

-Controls

DRIVE knob

TONE knob

LEVEL knob

Pedal switch

-Indicator

CHECK indicator (Used for indication of check battery)

-Connectors

INPUT jack: 1/4-inch phone type

OUTPUT jack: 1/4-inch phone type

DC IN jack

-Power Supply

Carbon-zinc battery (9 V, 6F22) or Alkaline battery (9 V, 6LR61)

AC adaptor (PSA series: sold separately)

-Current Draw

10 mA

-Expected battery life under continuous use (These figures will vary depending on the actual conditions of use.)

Carbon: Approx. 60 hours

Alkaline: Approx. 90 hours

-Dimensions

73 (W) x 129 (D) x 59 (H) mm

2-7/8 (W) x 5-1/8 (D) x 2-3/8 (H) inches

-Weight (including battery)

360 g

13 oz

-Accessories

Owner's manual

Leaflet ("USING THE UNIT SAFELY," "IMPORTANT NOTES," and "Information")

Carbon-zinc battery (9 V, 6F22)

-Options (sold separately)

AC adaptor: PSA series

* 0 dBu = 0.775 Vrms