From the manufacturer
FEATURES * A1 FOUR offers over 80 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 FOU 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.
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