An acoustic guitar amplifier is built to carry the sound of an acoustic or acoustic-electric guitar without the coloring of an electric guitar amp. Most add a second channel for a microphone, so one small box can handle a singer and a guitar. The details that matter are power, speaker layout, input types and built-in effects.
The six amps below range from a 10 W desktop-sized practice amp to a 60 W two-channel combo with a looper. Specs come from each product’s Amazon page. We have not used these amps ourselves, and several listings disagree with themselves, so we flag those below. Sound and warranty claims are the makers’ own.
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What to Look For
| Feature | Why it matters |
|---|---|
| Wattage | Practice and small rooms need little; a duo or a loud player needs more headroom |
| Channels and inputs | A separate XLR microphone channel lets you sing through the same amp |
| Speaker design | Larger drivers, a tweeter or a whizzer cone change how bright and wide it sounds |
| Effects | Reverb and chorus are common; looper and harmony are rarer |
| Size and weight | Matters if you carry it to every rehearsal |
Specs at a Glance
| Amp | Power and speaker | Inputs | Notes |
|---|---|---|---|
| Fender Acoustasonic 15 | 15 W; 6 in speaker | Instrument jack and XLR mic | Chorus; headphone output; listing shows 13 lb |
| Fender Acoustasonic 40 | 40 W; 6.5 in speakers listed | Instrument jack and XLR mic | Reverb on instrument channel; listing shows 10 lb |
| Fishman Loudbox Micro | 40 W; 5.25 in speaker | Instrument and mic channels; 1/8 in aux in | Digital reverb and chorus; balanced XLR D.I. out; 12.3 lb |
| Yamaha THR5A | 10 W; 3.1 in speakers | Guitar input; USB | Mic and effect simulations; Cubase AI software; about 2 kg |
| BOSS ACS-Live | 60 W; 6.5 in woofer and tweeter | Guitar channel and mic channel with phantom power | Looper, vocal harmony, three effects; about 12 kg |
| Blackstar Acoustic:Core 30 | 30 W; 5 in speakers listed | Three channels; USB; TRRS phone link | Super Wide Stereo; USB recording |
The 6 Best Acoustic Guitar Amplifiers
1. Fender Acoustasonic 15
A compact 15 W combo with a 6 inch speaker and two front-panel inputs, one quarter inch jack for an instrument and one XLR for a microphone. Fender describes a small extra “whizzer” cone on the speaker, and the amp has a chorus effect, a headphone output and a line out. The page lists a 2 year warranty in the text and a 5 year warranty in the details table, and gives two different sets of dimensions, so confirm both before ordering.
Suits: a singer-songwriter practicing at home. Strengths: a mic input and a headphone output. Weaknesses: modest power and conflicting listing data. Skip it if you play with a drummer.
View Fender Acoustasonic 15 on Amazon
2. Fender Acoustasonic 40
The larger Fender model is listed at 40 W with a 6.5 inch speaker size and the same instrument jack plus XLR microphone input pair. The instrument channel has built-in reverb. The text mentions both dual 6.5 inch speakers and a 6 inch speaker with a whizzer cone, and the dimensions are given in two different orders, so treat the speaker layout as unconfirmed.
Suits: small gigs and open mics. Strengths: more power than the 15 and built-in reverb. Weaknesses: an unclear speaker description. Skip it if you want a looper or a tweeter.
View Fender Acoustasonic 40 on Amazon
3. Fishman Loudbox Micro
A 40 W combo with a 5.25 inch speaker, two channels for instrument and microphone, digital reverb and chorus, a master volume, a 1/8 inch auxiliary input and a balanced XLR D.I. output for sending the signal to a mixer. It weighs 12.3 pounds, and the page lists a 1 year parts and labor warranty.
Suits: a small combo that can feed a house mixer. Strengths: an XLR D.I. output and an aux input. Weaknesses: a small speaker. Skip it if you need three or more channels.
View Fishman Loudbox Micro on Amazon
4. Yamaha THR5A
A small 10 W desktop-style amp with 3.1 inch speakers, USB connectivity and Cubase AI software. Yamaha describes simulations of tube condenser and dynamic microphones plus studio-style effects, aimed at electric-acoustic and silent guitars. The listing labels the amp type as tube, which does not match the maker’s modeling description, so we do not repeat it as fact.
Suits: quiet practice and recording at a desk. Strengths: USB recording and a small footprint. Weaknesses: low power and no mic input. Skip it if you need to fill a room.
View Yamaha THR5A Mini Acoustic Amp on Amazon
5. BOSS ACS-Live
A 60 W two-channel combo with a 6.5 inch woofer and dome tweeter. BOSS lists a three-band EQ on each channel, phantom power on the microphone channel, chorus, delay and reverb, an automatic vocal harmony function, a built-in looper and an anti-feedback control. The page names the model “Acoustic Singer” and the item type “Electric Guitar Power Amplifier,” and the warranty line only says to contact the manufacturer.
Suits: a vocalist who plays guitar. Strengths: phantom power, a looper and harmony. Weaknesses: the largest and heaviest here. Skip it if you only practice at home.
View BOSS ACS-Live Acoustic Amp on Amazon
6. Blackstar Acoustic:Core 30
A 30 W stereo amp with a digital modeling design, three channels, Super Wide Stereo reverb on each channel, two chorus effects and four-channel USB audio for recording. A TRRS cable can link it to a phone for streaming. The details table lists battery power and a weight of 454 g, which does not fit a 30 W amp with three channels, so check the maker’s specifications before relying on either figure. The warranty line tells buyers to contact the seller.
Suits: a stereo sound with streaming and recording. Strengths: three channels and USB recording. Weaknesses: inconsistent power and weight data. Skip it if you need a clear battery spec.
View Blackstar Acoustic:Core 30 on Amazon
Care and Setup
- Keep the guitar’s volume and tone knobs at a moderate level and set the amp’s EQ flat first.
- Place the amp behind or beside you, off the floor, to cut feedback.
- Use balanced cables for any D.I. or line output.
- Turn the amp off before plugging or unplugging cables.
Mistakes to Avoid
- Using an electric guitar amp and expecting an acoustic tone.
- Choosing power only and ignoring inputs.
- Believing a conflicting listing line instead of the maker’s page.
- Setting the bass too high, which invites feedback.
Acoustic Guitar Amplifier FAQ
Can I use a microphone?
Most of these have a mic channel. The Yamaha THR5A is the exception we found, with a guitar input only.
Is a bigger wattage always better?
No. Speaker design and channel count shape the use as much as the number.
The Short Version
For a simple mic and guitar combo, the Fender Acoustasonic 15. For more power, the Acoustasonic 40. For a mixer feed, the Fishman Loudbox Micro. For quiet desk practice, the Yamaha THR5A. For vocals, harmony and a looper, the BOSS ACS-Live. For stereo and USB recording, the Blackstar Acoustic:Core 30.
