Flatsons Crush20 20W Rechargeable Acoustic Guitar Amp with Dual Inputs

The separate guitar and vocal channels make it easier to play and sing through one compact amp, without needing a separate setup for each source. The Flatsons Crush20 also adds reverb and a two-band EQ for basic tone shaping.

Its rechargeable battery and wireless playback give it another role: it can play music from a phone, tablet, or laptop as well as amplify an acoustic guitar.

This is a portable, 20W amp built around a 5.5-inch speaker. Its feature set is aimed at practice and casual performances where guitar, vocals, and backing audio are useful in one unit.

Best use cases

The Crush20 is designed for acoustic guitar and a 1/4-inch dynamic microphone, so it suits a singer-songwriter practicing at home or taking a simple play-and-sing setup outdoors. The two inputs are optimized differently: Channel 1 is for a dynamic mic or an active guitar, while Channel 2 is for a passive guitar. Choosing the appropriate input matters if you want to avoid unstable volume or a thin tone.

Wireless 5.3 playback lets you pair a phone, tablet, or laptop for accompaniment. That makes it more versatile than an amp intended only for instrument input, though the wireless feature is for audio playback—not a replacement for the wired guitar and microphone connections described here. You’ll appreciate it if you want one portable unit for practice, backing tracks, and basic vocal amplification.

Strengths

Independent guitar and vocal channels give you a straightforward way to combine both sources. Reverb is available on both channels, while the bass and treble controls let you make broad tonal adjustments. The built-in play and pause controls are useful when managing wireless accompaniment from the amp instead of reaching for a paired device.

The manufacturer lists up to eight hours of battery life and a four-level LED battery display. That combination can help with untethered practice or a short outdoor session, although actual runtime can depend on use. The wood enclosure and wood color give the amp a more traditional look than a plain utility-style box.

Buyer feedback also highlights sound, appearance, battery life, and the built-in reverb. Some reviewers say its volume works for smaller settings, but those impressions are not a substitute for matching the amp to the size and demands of a particular performance space.

Technical overview

• Name: Flatsons Crush20
• Type: Rechargeable solid-state acoustic guitar amplifier
• Output: 20W
• Speaker: 5.5-inch full-range speaker
• Inputs: Two channels, 6.35mm jack
• Controls: Two-band bass and treble EQ, reverb on both channels
• Wireless playback: Wireless 5.3, stated range of 50ft (15m)
• Battery: 3000mAh, up to 8 hours of playtime
• Dimensions: 8.5"D x 6.5"W x 6.4"H
• Material and color: Wood, wood
• What’s included: Amp, USB-A to USB-C charging cable, and product manual

Before you decide

Can you plug in a vocal microphone? Yes, the listed microphone input is for a 1/4-inch dynamic mic. The manufacturer says condenser microphones are not supported, and directs microphone use to Channel 1.

Can you play music from a phone through it? Yes. It pairs wirelessly with phones, tablets, and laptops for playback. If it is already paired to another device, disconnect that device before trying to pair a new one.

Which channel should you use for your guitar? The manufacturer specifies Channel 1 for active guitars and Channel 2 for passive guitars. Check which type of guitar you have before connecting it.

Is it worth it?

The Crush20 makes sense if you want a rechargeable acoustic amp that combines guitar and dynamic-mic inputs, reverb, EQ, and wireless music playback. It offers more flexibility than a basic practice amp focused only on guitar, while still being a compact single-speaker setup. You may want to skip it if you need inputs for a condenser mic or are choosing an amp for a performance space where a small portable unit may not meet your coverage needs.