Amplifying an acoustic guitar can bring out its full potential, whether you’re performing live, recording in a studio, or simply practicing at home. Unlike electric guitars, which rely on amplifiers to shape their tone, acoustic guitars have a natural, resonant sound that must be carefully amplified to retain its character.
Using an amplifier correctly can help enhance your sound, minimize unwanted feedback, and provide a better listening experience for your audience.
In this guide, I will walk you through everything you need to know about using an amplifier for an acoustic guitar, from selecting the right amplifier to adjusting your settings for the best sound quality.
Understanding Acoustic Guitar Amplifiers
Acoustic guitar amplifiers are different from electric guitar amplifiers. Electric guitar amps are designed to add effects and distortions to the signal, while acoustic amps aim to reproduce the guitar’s natural sound as accurately as possible.
Why Use an Acoustic Amplifier?
- Better Sound Clarity – Amplifiers enhance the projection of the acoustic sound while maintaining clarity.
- Increased Volume – They allow you to be heard in larger spaces, from small gigs to big venues.
- Control Over Your Tone – You can tweak bass, mid, and treble frequencies to shape the sound to your liking.
- Effects and Features – Some acoustic amps come with built-in effects like reverb, chorus, and delay to enhance your sound.
Choosing the Right Acoustic Guitar Amplifier
When selecting an amplifier for your acoustic guitar, you need to consider several factors that affect the overall sound quality and performance.
1. Power Output
The wattage of the amplifier determines how powerful it is.
- For small gigs and practice – A 20-50 watt amp is sufficient.
- For medium-sized venues – A 50-100 watt amp provides enough volume.
- For large performances – Opt for a 100+ watt amp with a DI output for PA system integration.
2. Speaker Size
The size of the speaker impacts the depth and clarity of the sound.
- 6-8 inches – Ideal for home practice and small performances.
- 10-12 inches – Provides a fuller sound for live gigs.
- Dual speaker setups – Help distribute sound evenly across a larger area.
3. Built-in Features to Consider
Many acoustic amps come with additional features to enhance your playing experience.
- EQ Controls – Adjust bass, mid, and treble frequencies.
- Built-in Effects – Reverb, chorus, and delay for richer sound.
- Feedback Suppression – Helps reduce unwanted noise and squealing.
- Multiple Channels – Allows for plugging in microphones and backing tracks.
How to Connect Your Acoustic Guitar to an Amplifier
Setting up your guitar with an amplifier is simple, but ensuring a high-quality sound requires attention to detail.
1. Choose the Right Cable
- Always use a high-quality shielded instrument cable to avoid signal interference and noise.
- Avoid excessively long cables, as they can degrade signal quality.
2. Plug into the Correct Input
- If your guitar has an onboard preamp, plug it directly into the amplifier’s instrument input.
- If you’re using an external preamp or DI box, use the amplifier’s line input for the best sound quality.
3. Adjust Your Initial Settings
- Start with the volume at a low level and gradually increase it.
- Set EQ settings (bass, mid, treble) to neutral (12 o’clock position) as a starting point.
Adjusting Your Amplifier for the Best Sound
Proper settings ensure your acoustic guitar sounds natural and clear without unwanted distortion or feedback.
1. Adjusting EQ Settings
- Bass – Increase for a warmer, fuller sound. Reduce if it sounds too boomy.
- Mids – Adjust for clarity and presence.
- Treble – Enhances brightness and articulation. Too much treble can make the sound harsh.
2. Adding Effects to Your Sound
Some amplifiers include built-in effects that can add depth and character to your tone.
- Reverb – Adds a sense of space and ambiance.
- Chorus – Thickens and enriches the sound, giving it a fuller quality.
- Delay – Produces an echo effect for a more dynamic feel.
3. Controlling Feedback
Feedback is a common issue when amplifying an acoustic guitar. To minimize it:
- Position your amp correctly – Keep it slightly off to the side, not directly facing your guitar.
- Use the notch filter – Many acoustic amps have a notch filter to help eliminate problem frequencies.
- Lower the gain or volume – Too much gain can cause feedback.
Using an Amplifier in a Live Performance
When performing live, it’s essential to get the best possible sound from your amplifier.
1. Soundcheck Before Playing
- Always test your setup before a performance.
- Make adjustments based on the venue size and acoustics.
2. Blending with a PA System
- If playing in a larger venue, connect your amp to a PA system using a DI output for better sound distribution.
- Work with the sound engineer to balance levels and avoid excessive treble or bass.
3. Using a Microphone with Your Amp
- Some acoustic players prefer using a microphone instead of a pickup.
- If using a mic, position it properly to avoid feedback.
Recording with an Acoustic Guitar Amplifier
Amplifiers can also be used in studio settings for recording sessions.
1. Mic Placement for Recording
- Close-mic the speaker using a dynamic microphone for a focused sound.
- Use a condenser mic at a distance to capture natural room acoustics.
2. Direct Recording (DI Output)
- Some acoustic amps come with a DI (Direct Input) output that lets you connect directly to an audio interface for recording.
3. Combining Mic and DI for the Best Sound
- Many professional recordings blend both mic and DI signals for a balanced tone.
Troubleshooting Common Amplifier Issues
1. Why is My Amp Buzzing?
- Check for loose cables.
- Ensure you’re using a high-quality power source.
2. Why is My Guitar Sounding Too Harsh?
- Reduce treble or increase mids for a warmer tone.
3. How Can I Prevent Feedback?
- Lower the gain and reposition the amplifier.
Final Thoughts
Using an amplifier for an acoustic guitar can greatly enhance your sound, whether you’re performing live, recording in a studio, or just practicing at home.
By choosing the right amplifier, setting it up correctly, and adjusting EQ settings properly, you can achieve a clean, natural tone with plenty of projection.
Experiment with different settings, effects, and microphone placements to find the perfect sound for your playing style. With practice and experience, you’ll master the art of amplifying your acoustic guitar for any musical situation.