A2.1U by Zoom

The Zoom A2.1U is an acoustic effects pedal designed to enhance the natural sound of acoustic guitars. It incorporates 24-bit / 96 kHz sampling and sophisticated sound modeling technology to process the line signal from the pickup, adding a lush body tone and spatial ambience created by mic recording. The A2.1U features 47 high-quality effects implemented with 32-bit processing, 8 effect modules, and allows for a maximum of 8 simultaneous effects. It offers 40 preset effects for acoustic guitar, 40 programmable memory patches, and includes guitar and body-style modeling.

The pedal has a wide frequency response of 20Hz – 40kHz, ultra-low noise design with a 100 dB signal-to-noise ratio, and sturdy metal chassis with rubber damping for superior toughness and durability. It operates on 4 AA batteries or an included AC power adapter, and the built-in expression pedal adds further versatility to guitar play. The A2.1U also features a built-in drum machine with 40 rhythm variations, an integrated chromatic tuner, and a USB interface for computer recording.

The A2.1U's specifications include:
- Effect Types: 47
- Effect Modules: 8
- Maximum Simultaneous Effects: 8
- Patch Memory: User 40 + Preset 40, Total 80
- Sampling Frequency: 96kHz
- A/D Conversion: 24-bit, 64 times over-sampling
- D/A Conversion: 24-bit, 128 times over-sampling
- Input: 1/4" phone jack (Rated input level: -20dBm, Input impedance: 1Mohm)
- Output (Line/headphones combined): 1/4" stereo phone jack (Maximum output level: +5dBm, Output load impedance: 10kohm or higher)
- Balanced Output: XLR jack (Input/output gain: 0dB, Output impedance: 200ohm/HOT-COLD)
- Control Input: Expression pedal, Foot switch
- USB interface: 16-bit, 32kHz/44.1kHz/48kHz
- Power Requirements: AA size (LR6) battery x 4 (Optional), or AC adapter DC9V/300mA/Center minus type (Optional, AD-0006D recommended)
- Battery Life: 6 hours (with alkaline batteries)
- Dimensions: 255(W) x 165(D) x 79(H)mm
- Weight: 1200g (without batteries)

The A2.1U is a versatile and powerful acoustic effects pedal suitable for both stage and studio use, offering a wide range of features and high-quality sound processing capabilities.