Flatsons Crush20 20W Portable Acoustic Guitar Amplifier

The flatsons Crush20 is a battery-powered acoustic guitar amplifier with a separate microphone input, two-band EQ and reverb. Its claimed 20W output, 5.5-inch speaker and 1.9kg listed weight suit portable practice and small gatherings, while the manufacturer cautions that it is not designed for regular electric guitars.

At a glance

Separate guitar and microphone channels are described with individual reverb control. The listing also specifies a two-band EQ.
The manufacturer claims up to 8 hours of battery operation and lists a 4-level battery indicator.
Wireless 5.3 playback is claimed, with a stated 15m (50ft) working range.
USB-C charging cable and manual are listed as included.

Price

£84.99Save 15%

Reference price: ~~£99.99~~

Price checked: 12 Nov 2026

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Pros and cons

Pros

Battery power, a carry handle and the listed 1.9kg weight support use away from a mains outlet.
Separate guitar and microphone inputs are suited to combining acoustic playing and vocals.
Customer feedback reports compact portability and sufficient volume for small venues.

Cons

The manufacturer specifically says this acoustic-focused amp is unsuitable for regular electric guitars and will not provide their expected saturated tone.

Technical specifications

13 specifications

Identity
Brand	flatsons
Model	Crush20

Audio and inputs
Output wattage	20 Watts
Speaker size	5.5 Inches
Number of bands	2
Amplifier type	Solid State
Connector type	6.35mm Jack
Sound profile	Full-Range
Compatible device	Guitar

Power and battery
Power configuration	Battery Powered

Dimensions and installation
Dimensions (D x W x H)	16.6D x 21.5W x 16.3H centimetres
Weight listed	1.9 Kilograms

Materials and appearance
Colour	Wood

What to know before buying

The manufacturer’s wireless range and up-to-8-hour battery duration are stated claims, not independent measurements. Microphone support is specified for dynamic mics only. The listing says Channel 1 supports active guitars and microphones and Channel 2 passive guitars, so check your instrument and mic requirements before buying.

What’s in the box

Included

USB-C charge cable (1)
User manual (1)

Who is it for?

A good fit for

Acoustic guitarists who want a rechargeable amp for practice or portable use.
Singers accompanying themselves and needing a separate microphone input.
Buyers seeking a compact amp with claimed wireless playback and built-in reverb.

Less suited to

Players seeking an amp for regular electric guitar tones or distortion.
Users who need confirmed compatibility with condenser microphones.

Flatsons Crush20 20W Portable Acoustic Guitar Amplifier · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.5 / 5 · 137 ratings

5 stars74%74%
4 stars13%13%
3 stars5%5%
2 stars5%5%
1 star3%3%

Customer feedback highlights compact size, portability, sound quality and volume, with reports of enough output for small venues and quick USB-C charging. Some customers describe using it with both acoustic and electric guitars, but that reported use conflicts with the manufacturer’s advice that it is not suitable for regular electric guitars. Treat the praise as customer perception rather than proof of performance, and consider the claimed 20W output and portable design in light of your intended setting.

Positive themes

Customers report a compact, portable design and positive sound quality.
Feedback describes sufficient volume for small venues and praises USB-C charging.

Frequently asked questions

Is the Crush20 suitable for an electric guitar?

The manufacturer advises against regular electric guitar use. It says the amp’s acoustic-oriented full-range tuning does not create electric-guitar-style saturated midrange and distortion.

Can I use a microphone with it?

The listing describes a microphone input and says dynamic microphones are supported. It states that condenser microphones are not supported and directs microphones to Channel 1.

How long does the battery last?

The manufacturer claims up to 8 hours of continuous operation. Actual runtime is not independently established in the supplied information.

What is included in the box?

The manufacturer’s listed contents are one USB-C charge cable and one user manual.