JOYO AC40 Battery Powered Acoustic Guitar Amplifier with Mic Channel - 40 Watts

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The JOYO AC-40 has been designed with tone suited to acoustic guitar sounds. Includes 40W battery powered amp, 3 band EQ, independent guitar and mic (dynamic) channels, AUX input and Delay, Chorus and Reverb effects for Guitar and Reverb for Vocals.

JOYO AC40 40W - Compact Amplifier for Acoustic Guitar
The JOYO AC-40 has been designed with tonal characteristics specifically enhancing acoustic guitar sounds. Featuring a natural sounding three band EQ, the amp produces sparkly highs and detailed mids without too much low-end "woof-y-ness", perfect for amplifying your acoustic guitar without too much electric "twang".  With 40W of power, delay, chorus and reverb effects and additional mic and auxiliary inputs, the AC-40 is excellent for practice sessions and even small live shows. 

Battery Powered
The big brother the AC20, the AC40 not only has more power but also features a rechargeable battery. This makes the amp completely portable and unreliant on mains power, a highly flexible acoustic amplification solution. When fully charged the AC40 offer 3 hours of continuous playing time. Charging time is 2-3 hours.

3 Independently Controllable DSP effects: Chorus, Delay and Reverb
The guitar section of the AC-20 features 3 built-in DSP effects: Chorus, Delay and Reverb, all of which can be used simultaneously - such flexibility is rare among similar amplifiers. Dial in the right combination of these effects to get get great pop, rock and jazz sounds acoustic sounds. 

Microphone Channel
The amp also features dynamic microphone amplification channel giving you a defined and present vocal sound. This channel also features a reverb to help blend vocal and guitar sounds and add space and texture. 

Auxiliary Input
Any great acoustic amp needs an AUX input and so does the AC-20. Connect your phone, MP3, or CD Player and play along to backing tracks for practice or performance. 

An Important Note from the Supplier
While JOYO's range of AC amplifiers has proven to be a popular item among the Australian and international markets, stock has been received with an unfortunately high noise floor. JOYO have assured us that this is well within their accepted signal to noise ratio, and SWAMP have extensively tested the range to confirm that no noise can be heard when performing, playing back music, or just jamming through the mic and guitar channels. No controls on the AC amplifiers will increase the noise, and it is not present when audio is passing through the speaker. When the amplifier is switched on, a "whoosh" or "hiss" may be heard, though we have been assured by JOYO that this is normal performance for the AC amplifier range.


  • Stereo Power Amp
  • Built-in Rechargeable Battery
  • Dual 6.5 inch Speakers
  • Independant Guitar and Mic Channels
  • Guitar Effects: Chorus, Delay (max 500ms), Reverb
  • Mic Effects: Reverb 
  • 3 Band EQ - Bass, Middle, Treble (Guitar Channel)
  • Independant Guitar and Mic Volume Controls
  • 3.5mm Auxiliary Input


  • Guitar Input: -18.2dBv
  • Microphone Input: -40.7 dBv (only suits Dynamic Mics)
  • Aux In: -14dBv
  • Output: 40W RMS @ 4ohm/1khz
  • Dimensions: 400mm x 210mm x 265mm
  • Weight: 8.35Kg
  • Included Power Supply: Input: AC 100V-250V, 50-60Hz  Output: DC 15V 4A
  • Charging Time: 2-3 Hours
View PDF brochure for JOYO AC40 Battery Powered Acoustic Guitar Amplifier with Mic Channel - 40 Watts

Great for busking

By: on 17 January 2020
I bought this amp for busking around Perth, great sound, reliable, light weight and worth the money. You won't be disappointed, John

Great product

By: on 27 December 2018
I was offered this solution as a larger, more expensive (from another manufacturer) failed to meet my expectations. This is an excellent amp and the ease of use is just what I was looking for. Don’t be fooled by the 40 watt rating, this device is clean articulate and loud. Hats off to the swamp team also for their excellent service and customer support. These guys deserve my support

Great value

By: on 2 August 2018
Having chorus, echo and Reverb side by side with single controls is great! Tone excellent. Some ideas but they don't detract from great value. 1) some tone control on mic. 2) xlr socket ALSO for mic. 3). Volume control on aux. Again - great value regardless of the suggestions I've made. I love it!

A cracker for busking

By: on 25 October 2017
I needed a amp that can suit my desire to busk and this cracked it. The sound is terrific and 3 hours is perfect.

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