The Marshall AS50D is a versatile 50-watt acoustic combo amplifier designed to reproduce the natural detail, dynamics and character of acoustic instruments.

Its two-channel configuration allows an electro-acoustic guitar and microphone to be connected simultaneously, making it an excellent self-contained amplification solution for solo singers, acoustic duos, rehearsals, open-mic performances and intimate live venues.

Two custom 8-inch speakers and a high-frequency tweeter deliver a broad, articulate sound with the clarity required for piezo, magnetic and microphone-based acoustic instrument systems. Built-in chorus and reverb add depth and dimension, while dedicated anti-feedback controls help manage troublesome frequencies on stage.

A balanced DI output, line output and parallel effects loop provide the connectivity required for PA systems, recording equipment and external effects. Finished in classic black Marshall styling, the AS50D combines practical performance features with a compact and portable design.

At A Glance

Feature	Details
Brand	Marshall
Model	AS50D
Range	Marshall Acoustic
Colour	Black
Product Type	Acoustic guitar and vocal combo amplifier
Condition	Brand New
Amplifier Technology	Solid state
Output Power	50 watts
Channels	Two
Instrument Inputs	Two 1/4-inch jack inputs
Microphone Input	XLR input
Auxiliary Input	Stereo RCA phono input
Speakers	Two custom 8-inch speakers
High-Frequency Driver	Hi-Fi tweeter
Built-In Effects	Digital chorus and reverb
Anti-Feedback Controls	Phase switch and frequency-adjustable notch filter
Effects Loop	Parallel Send and Return
DI Output	Balanced XLR
Line Output	Yes
Main Appeal	Acoustic instrument and vocal amplification in one portable system
Best For	Solo performers, acoustic duos, rehearsals, busking setups and intimate venues
Country of Manufacture	Designed and engineered in the UK; made in Vietnam

Why Choose the Marshall AS50D?

Natural Acoustic Instrument Reproduction

The AS50D is designed specifically for acoustic instruments rather than conventional electric guitar tones.

Its broad and detailed frequency response helps preserve the character of:

• Electro-acoustic guitars

• Nylon-string electro-acoustic guitars

• Acoustic basses

• Mandolins

• Violins

• Ukuleles

• Other compatible amplified acoustic instruments

The amplifier accommodates instruments fitted with piezo transducers, magnetic soundhole pickups and active or passive pickup systems.

Unlike an electric guitar amplifier, which intentionally colours the sound and produces speaker distortion, the AS50D focuses on clarity, definition and a more natural representation of the instrument.

Two Independent Channels

The two-channel design allows an instrument and microphone to be connected at the same time.

Each channel has independent Volume, Bass and Treble controls, allowing the guitar and vocal sounds to be balanced and shaped separately.

This makes the AS50D particularly useful for solo performers who want to carry one compact amplification system instead of a separate guitar amplifier, vocal mixer and powered speaker.

Dedicated Acoustic Instrument Channel

Channel 1 is designed for an acoustic instrument fitted with a compatible pickup system.

Its high-impedance 1/4-inch input works with passive and active piezo pickups as well as magnetic acoustic guitar pickups.

Independent controls include:

• Volume

• Bass

• Treble

These controls make it easy to balance the amplifier for different instruments and pickup systems. Bass can be reduced to control boominess, while Treble can be adjusted to add clarity or soften an overly bright piezo response.

Microphone and Auxiliary Channel

Channel 2 provides both a 1/4-inch instrument input and an XLR microphone input.

This allows the channel to accommodate:

• Vocal microphones

• Instrument microphones

• A second compatible acoustic instrument

• Other suitable audio sources

The microphone connection supports compatible dynamic and condenser microphones, including phantom-powered microphone operation.

Channel 2 also features its own Volume, Bass and Treble controls, so the microphone or second instrument can be balanced independently from Channel 1.

Stereo Auxiliary Input

A stereo RCA phono input allows an external audio source to be connected.

This can be used for:

• Backing tracks

• Interval music

• Drum patterns

• Practice applications

• Accompaniment tracks

• Music from a compatible phone, tablet or computer

The auxiliary connection makes the AS50D useful for practice, teaching and small performances where backing material is required.

Twin 8-Inch Speakers and Tweeter

The AS50D uses two custom 8-inch speakers alongside a dedicated high-frequency tweeter.

The twin-speaker configuration provides greater sound dispersion and a broader presentation than a compact single-speaker practice amplifier. The tweeter reproduces the upper-frequency detail required for acoustic guitar harmonics, pick attack and vocal clarity.

This speaker system delivers:

• Defined bass response

• Clear midrange

• Detailed upper frequencies

• Improved vocal intelligibility

• Broad sound dispersion

• Natural acoustic instrument attack

An internal limiter helps protect sound quality as the amplifier approaches its maximum output, allowing the 50-watt system to remain clear and controlled.

Built-In Digital Chorus

The onboard chorus effect adds width and movement to the amplified sound.

Dedicated Speed and Depth controls allow the effect to be adjusted from a subtle widening of the instrument to a more pronounced modulation sound.

The chorus can be assigned to:

• Channel 1

• Channel 2

• Both channels

This lets performers apply chorus to the acoustic instrument without necessarily affecting the vocal microphone, or use it creatively across both channels.

Built-In Reverb

Digital reverb adds space and ambience to instruments and vocals.

The Reverb Level control determines the overall amount of effect, while the Balance control distributes the reverb between the two channels.

This allows different combinations to be created, including:

• A dry vocal with more reverb on the guitar

• A spacious vocal with subtle guitar ambience

• Balanced reverb across both channels

• Minimal ambience for clear spoken or instrumental performance

The ability to balance the effect between the channels is particularly useful for solo performers managing both guitar and vocals.

Dedicated Anti-Feedback Controls

Feedback can be a major problem when amplifying acoustic instruments and microphones, particularly in small venues or when the amplifier is positioned close to the performer.

The AS50D includes two dedicated anti-feedback tools.

Phase Switch

The Phase switch reverses the signal phase and can help reduce low-frequency feedback caused by the relationship between the instrument, amplifier and room.

Frequency-Adjustable Notch Filter

The Notch filter targets a narrow problematic frequency without heavily altering the rest of the sound.

The frequency control can be swept to locate the point where feedback is developing. Once identified, the filter can reduce that frequency while preserving the overall character of the instrument.

Together, these controls provide a more precise solution than simply reducing the amplifier’s Bass control or lowering the overall volume.

Parallel Effects Loop

The rear-panel parallel effects loop allows external effects processors to be integrated with the amplifier.

Compatible effects can include:

• Delay

• Reverb

• Chorus

• Multi-effects processors

• Acoustic guitar preamps

• Compatible rack equipment

The parallel configuration retains the original dry signal while blending it with the processed signal returned from the connected effect.

The Reverb and Loop balance controls help distribute the returned effects signal between the amplifier’s two channels.

Balanced DI Output

The balanced XLR DI output allows the AS50D to send its signal to a compatible PA system, mixing console or recording interface.

This is especially useful when:

• Performing in a larger venue

• Connecting to a front-of-house sound system

• Recording an amplified acoustic performance

• Sending a direct signal while using the amplifier as a personal monitor

• Providing the sound engineer with a balanced output

The internal speakers continue to provide on-stage monitoring while the DI sends the signal to the external system.

Line Output

A line-level output provides an additional connection for compatible audio equipment.

It can be used with:

• Recording equipment

• Mixers

• Additional amplification systems

• Compatible powered speakers

• Audio interfaces

This gives the AS50D greater flexibility than a basic acoustic practice amplifier.

Optional Footswitch Control

A rear-panel footswitch socket supports compatible optional remote control.

This allows performers to control selected effects without reaching down to the amplifier during a song.

The footswitch is available separately.

Portable 50-Watt Performance

The AS50D provides enough output for rehearsals, open-mic nights, small performances and many intimate venues while remaining compact enough for regular transport.

Its approximately 14.1kg weight and integrated carrying handle make it considerably easier to move than a separate mixer, powered speaker and instrument amplifier system.

Why Choose a Dedicated Acoustic Amplifier?

An acoustic amplifier is designed to reproduce the natural sound of an instrument rather than create the intentional tonal colour and speaker breakup associated with an electric guitar amplifier.

This makes a dedicated acoustic amplifier particularly effective for instruments fitted with:

• Piezo bridge pickups

• Internal microphones

• Magnetic soundhole pickups

• Blended pickup systems

• Active acoustic preamps

The AS50D also provides features rarely found on a conventional electric guitar amplifier, including an XLR microphone input, anti-feedback controls, a tweeter, balanced DI output and independent channel effect balancing.

For singer-guitarists, it can replace several separate pieces of equipment with one compact performance system.

Who Is It For?

Singer-Songwriters

The two-channel format allows an electro-acoustic guitar and vocal microphone to be amplified through one system.

Independent EQ and volume controls make it easy to balance both sources without requiring an external mixer.

Solo Acoustic Performers

The AS50D provides enough connectivity for an instrument, microphone and backing-track source, making it a practical self-contained system for small performances.

Acoustic Duos

Channel 2 can accommodate a second compatible instrument instead of a microphone, allowing two acoustic musicians to share the amplifier.

Open-Mic and Small-Venue Performers

Its 50-watt output, DI connection and compact design make the amplifier well suited to cafés, pubs, restaurants, community venues and open-mic stages.

Acoustic Guitar Teachers

The auxiliary input supports backing tracks and lesson material, while the two main channels can accommodate a teacher and student instrument.

Home and Rehearsal Players

At lower Master Volume settings, the AS50D provides detailed acoustic amplification for practice and songwriting.

The built-in effects allow a complete and inspiring sound to be created without a separate pedalboard.

Multi-Instrumentalists

The broad frequency response makes the amplifier suitable for a variety of compatible amplified acoustic instruments, not just steel-string guitars.

What’s Included?

• Marshall AS50D Black acoustic combo amplifier

• Detachable mains power cable

• Manufacturer documentation

Understanding the AS50D Controls

Acoustic Channel 1

Channel 1 includes:

• 1/4-inch instrument input

• Volume

• Bass

• Treble

It is intended primarily for an electro-acoustic instrument fitted with a suitable pickup system.

Microphone/Auxiliary Channel 2

Channel 2 includes:

• XLR microphone input

• 1/4-inch instrument input

• Volume

• Bass

• Treble

It can be used with a compatible microphone, second instrument or suitable auxiliary source.

Chorus Section

The chorus section includes:

• Channel assignment

• Speed

• Depth

The effect can be applied to either channel or both channels.

Reverb and Loop Section

This section includes:

• Reverb Balance

• Reverb Level

These controls adjust the amount and channel distribution of the built-in reverb and compatible effects-loop signal.

Anti-Feedback Section

The anti-feedback controls include:

• Phase switch

• Notch filter

• Frequency sweep

These tools help control feedback without unnecessarily reducing the overall volume or changing the entire EQ response.

Master Section

The Master Volume sets the final output level of the amplifier after the individual channels have been balanced.

Technical Specifications

Specification	Details
Brand	Marshall
Model	AS50D
Official Model Reference	AS50DV
Range	Acoustic
Amplifier Type	Acoustic guitar and vocal combo
Amplifier Technology	Solid state
Output Power	50 watts
Number of Channels	Two
Channel 1 Input	One 1/4-inch high-impedance instrument input
Channel 2 Inputs	One 1/4-inch instrument input and one XLR microphone input
Auxiliary Input	Stereo RCA phono input
Channel 1 Controls	Volume, Bass and Treble
Channel 2 Controls	Volume, Bass and Treble
Built-In Effects	Digital chorus and reverb
Chorus Controls	Channel assignment, Speed and Depth
Reverb Controls	Balance and Level
Anti-Feedback Controls	Phase switch, Notch filter and frequency sweep
Master Control	Master Volume
Effects Loop	Parallel Send and Return
DI Output	Balanced XLR
Line Output	Yes
Footswitch Connection	Yes
Speaker Configuration	Two 8-inch speakers plus tweeter
Speaker Type	Custom acoustic speakers
Unit Impedance	4 ohms
Internal Limiter	Yes
Width	565mm
Height	415mm
Depth	250mm
Weight	Approximately 14.1kg
Colour	Black
Design and Engineering	United Kingdom
Country of Manufacture	Vietnam

Power Requirements

The Marshall AS50D operates from mains electricity and includes a detachable power cable.

Before switching on:

• Connect instruments and microphones securely

• Turn both channel Volume controls down

• Turn the Master Volume down

• Connect any effects or external equipment

• Connect the mains cable

• Switch the amplifier on

• Gradually raise the channel and Master Volume controls

The amplifier should be positioned where air can circulate freely around it. Ventilation openings must not be covered during use.

Using the AS50D on Stage

For a typical singer-guitarist setup:

1. Connect the electro-acoustic guitar to Channel 1.

2. Connect the vocal microphone to the XLR input on Channel 2.

3. Adjust the channel Volume controls to balance the guitar and voice.

4. Shape each source with its independent Bass and Treble controls.

5. Add chorus to the guitar channel when required.

6. Use the Reverb Balance control to distribute ambience between the guitar and vocal.

7. Use the Phase and Notch controls if feedback occurs.

8. Set the final performance level with the Master Volume.

9. Connect the balanced DI output to the venue’s PA system when additional coverage is needed.

The amplifier can then be positioned as a personal monitor while the PA carries the sound throughout the venue.

AS50D Compared With Other Amplification Options

Acoustic Amplifier Versus Electric Guitar Amplifier

An electric guitar amplifier is intentionally voiced to colour the sound and may distort as its output increases.

The AS50D is designed for greater clarity and a broader frequency response, making it more suitable for piezo pickups, acoustic instruments and vocals.

Acoustic Amplifier Versus Portable PA

A portable PA may offer additional microphone channels, but it may not provide the instrument-focused EQ, chorus and anti-feedback controls found on the AS50D.

The Marshall is particularly convenient for performers who primarily need one acoustic instrument channel and one vocal or auxiliary channel.

AS50D Versus a Smaller Acoustic Practice Amplifier

A smaller amplifier may be easier to carry, but the AS50D provides greater output, twin speakers, a tweeter, two full channels, anti-feedback controls and professional outputs.

It is better suited to players who intend to perform as well as practise.

Frequently Asked Questions

Can the Marshall AS50D amplify a guitar and microphone simultaneously?

Yes. Channel 1 can accommodate an electro-acoustic instrument while Channel 2 accepts a compatible microphone through its XLR input.

Does the microphone input provide phantom power?

Yes. The microphone connection supports phantom-powered operation for compatible condenser microphones and can also be used with suitable dynamic microphones.

Can two instruments be connected?

Yes. Each channel has a 1/4-inch instrument input, allowing two compatible acoustic instruments to be used simultaneously.

Does the AS50D have built-in effects?

Yes. It includes adjustable digital chorus and reverb.

The chorus can be assigned to either channel or both, while the reverb can be balanced between the two channels.

How does the anti-feedback system work?

The Phase switch changes the phase relationship between the instrument and amplifier, while the adjustable Notch filter targets a narrow feedback frequency.

The frequency control can be swept until the problematic feedback is reduced.

Can it connect to a venue PA?

Yes. The balanced DI output can send the amplifier signal to a compatible PA mixer or recording system.

Does it have an effects loop?

Yes. The AS50D has a parallel Send and Return effects loop for compatible external processors.

Is a footswitch included?

No. The amplifier has a socket for a compatible optional footswitch, which is available separately.

Can backing tracks be connected?

Yes. The stereo RCA auxiliary input can accept audio from a compatible phone, tablet, computer or music player with the correct cable.

Is the AS50D suitable for an electric guitar?

The AS50D is designed for acoustic instruments and clean reproduction. It is not intended to produce conventional electric guitar amplifier distortion.

Can distortion pedals be used with it?

Distortion pedals should not be used to drive the AS50D like a conventional electric guitar amplifier. Its full-range acoustic speaker system is designed for clean acoustic reproduction rather than heavily distorted electric guitar signals.

Is the AS50D suitable for live performance?

Its 50-watt output is suitable for rehearsals and many smaller performances. The balanced DI output also allows the amplifier to connect to a larger venue PA when additional coverage is required.

Fair Deal Music Verdict

★★★★★ 5/5

The Marshall AS50D remains an exceptionally practical amplifier for acoustic musicians who need to manage an instrument, vocal microphone and effects from one compact system.

Its twin 8-inch speakers and tweeter provide the clarity needed for detailed acoustic pickups and vocals, while the independent channel controls make it easy to create a balanced mix. The assignable chorus, channel-balanced reverb and dedicated anti-feedback tools add genuinely useful performance flexibility.

Professional connections including a balanced DI output, line output and parallel effects loop also allow the AS50D to move easily from home practice and rehearsals to recording sessions and live venues.

For singer-songwriters, acoustic duos and performers looking for a dependable all-in-one amplification solution, the AS50D is an excellent choice.

Why Buy From Fair Deal Music?

Choosing Fair Deal Music means buying from a passionate team of musicians who genuinely understand the products we sell. Whether you’re purchasing your first instrument, upgrading your current setup or searching for something special, we’re here to help you make the right choice with friendly advice and expert support.

When you shop with Fair Deal Music, you can buy with confidence thanks to:

• Expert advice from knowledgeable musicians

• Carefully checked new, used, pre-owned and ex-display equipment

• Competitive prices on leading music brands

• Secure UK-wide delivery

• Flexible finance options available, subject to status

• Friendly support before and after your purchase

• A trusted independent UK music retailer with decades of experience

Trade In. Trade Up. Save More.

Thinking about upgrading? Your next piece of gear could cost less than you think. We’re always happy to consider part exchanges and trade-ins on a wide range of musical instruments and equipment. Whether you’re looking to trade a guitar, amplifier, keyboard, drum kit, pedal or studio equipment, our team can provide a fair, no-obligation valuation and help make your next upgrade more affordable.

Contact our team or visit the Fair Deal Music Birmingham showroom to discuss your equipment and discover how much you could save.