A1 Four

The Zoom A1 Four is a versatile acoustic instrument multi-effects processor designed for a variety of acoustic string and wind instruments. Here are the technical specifications and features:

- Maximum number of simultaneous effects: 5
- User patches: 50
- Sampling frequency: 44.1 kHz
- A/D conversion: 24-bit, 128× oversampling
- D/A conversion: 24-bit, 128× oversampling
- Signal processing: 32-bit
- Display: 128x32 dot matrix LCD
- Input:
- Standard mono phone jack
- Rated input level: -20 dBu
- Input impedance (line): 470 kΩ
- AUX IN:
- Stereo mini jack
- Rated input level: -10 dBu
- Input impedance (line): 1kΩ
- Output:
- Standard stereo phone jack (combined line/headphone)
- Maximum output level: Line +2 dBu (10 kΩ or more output impedance)
- Headphones 17 mW + 17 mW (32Ω load)
- Input S/N: 120dB
- Noise floor (residual noise): -97 dBu
- Power:
- AC adapter: 9V DC 500mA center negative (ZOOM AD-16)
- 4 AA batteries (about 18 hours continuous operation time when using alkaline batteries with the LCD backlight off)
- USB port for firmware updates, power, and connection to ZOOM Guitar Lab
- Dimensions and Weight:
- A1 FOUR:
- Height: 156 mm (D) × 130 mm (W) × 42 mm (H)
- Weight: 340 g (excluding batteries)
- A1X FOUR:
- Height: 156 mm (D) × 216 mm (W) × 52 mm (H)
- Weight: 610 g (excluding batteries)

Features:
- Over 80 built-in effects (A1X FOUR offers over 90 built-in effects)
- Dedicated effects for acoustic guitar, saxophone, trumpet, violin, and harmonica
- Looper for recording up to 30 seconds / 64 beats of CD-quality audio with seamless start and end times
- ZOOM Guitar Lab software for creating, editing, and managing effects and patches
- Onboard chromatic tuner supports all standard guitar tunings, including open and drop tunings
- 68 built-in rhythm patterns tailored for unplugged styles of music can be used in combination with the Looper
- Anti-Feedback Filter to detect and cut frequencies that cause potential feedback
- USB port for firmware updates, power, and connection to ZOOM Guitar Lab

The A1 Four/A1X Four is a powerful and versatile multi-effects processor tailored for acoustic instruments, offering a wide range of effects and features to enhance the performance and creativity of acoustic musicians.