FEATURES
ZOOM original power supply adaptor AD-16E included
A1 FOUR offers over 80 built-in effects / A1X FOUR offers over 90 built-in effects
Dedicated effects for acoustic guitar, saxophone, trumpet, violin, and harmonica
Up to 5 effects can be used simultaneously, chained together in any order
50 memory locations for storing user-created patches
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
68 built-in rhythm patterns tailored for unplugged styles of music can be used in combination with the Looper
Onboard chromatic tuner supports all standard guitar tunings, including open and drop tunings
Output jack for connection to amp or headphones
A1 FOUR and A1X FOUR runs on 4 AA batteries, with alkaline battery life of 18 hours; MAA-1 Requires 2 AA batteries
USB port for firmware updates, power and connection to ZOOM Guitar Lab

SPECS
A1 FOUR/A1X FOUR
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
INPUT Standard mono phone jack Rated input level: -20 dBuInput impedance (line): 470 kΩ
AUX IN Stereo mini jack Rated input level: -10 dBuInput impedance (line): 1kΩ
OUTPUT
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 USB MIDI, USB Micro-B Power can also be supplied through the USB port.When using a cable designed only for power, other USB functions cannot be used.
EXTERNAL DIMENSIONS 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)
MAA-1
INPUT INPUT XLR balanced input (2: hot) Input gain: +3 – +30 dBInput impedance: 10 kΩMaximum input level: +4 dBu+48V phantom power
OUTPUT Standard mono phone jack Nominal output level: −20 dBuMaximum output level: +7 dBuOutput impedance: 1 kΩ
POWER 2 AA batteries Continuous operation time (when phantom current is 3 mA) About 15 hours (using alkaline batteries)
About 15 hours (using nickel metal hydride batteries)
EXTERNAL DIMENSIONS Height: 177 mm (D) × 23 mm (W) × 25 mm (H) Weight : 70 g (excluding batteries)