The Marshall AS50D is a versatile 50-watt acoustic amplifier designed for electro-acoustic instruments, microphones and compact singer-songwriter setups. Its two independent channels allow an acoustic instrument and vocal microphone to be amplified through one portable system, with separate volume, bass and treble controls for each channel.

Two custom 8-inch speakers are paired with a dedicated 4-inch tweeter to reproduce the detail, clarity and extended high-frequency response required by acoustic instruments and vocals. The AS50D works with magnetic and piezo pickup systems, while its XLR microphone input supplies phantom power for compatible condenser microphones and also supports dynamic microphones.

Built-in chorus and digital reverb provide useful sound enhancement without requiring additional effects pedals. Phase and frequency-selective notch controls help manage acoustic feedback, while the emulated DI output, line output and parallel effects loop make the AS50D suitable for home use, rehearsals, recording and intimate performances.

At A Glance

Feature	Details
Brand	Marshall
Model	AS50D
Official Model Reference	AS50DV
Amplifier Type	Solid-state acoustic instrument and vocal combo
Output Power	50 watts
Channels	Two
Speaker Configuration	2 x 8-inch custom speakers plus 1 x 4-inch tweeter
Instrument Compatibility	Magnetic and piezo-equipped acoustic instruments
Microphone Input	XLR with phantom power
Built-In Effects	Digital chorus and reverb
Anti-Feedback Controls	Phase, notch filter and frequency sweep
Effects Loop	Parallel effects loop
Direct Output	Emulated DI output
Line Output	Yes
Auxiliary Input	Stereo RCA/phono input
Condition	Brand New
Main Appeal	Acoustic instrument and vocal amplification from one portable combo
Best For	Singer-songwriters, acoustic performers, rehearsals and intimate venues
Skill Level	Beginner to professional

---

Why Choose the Marshall AS50D?

Two Independent Channels

The AS50D provides two channels with independent volume, bass and treble controls.

Channel 1 is dedicated to an electro-acoustic instrument, while Channel 2 can accommodate another instrument, a microphone or an external audio source. This allows the amplifier to form the centre of a compact solo or duo performance setup.

Separate tone controls make it possible to give an acoustic guitar a bright, detailed sound while setting a warmer and smoother balance for vocals.

Suitable for Piezo and Magnetic Pickups

Acoustic instruments use a variety of pickup technologies, and each can respond differently when amplified.

The AS50D has been designed to work with both piezo and magnetic pickup systems. This makes it suitable for many electro-acoustic guitars as well as other amplified acoustic instruments.

Its clean solid-state circuit prioritises clarity and natural reproduction rather than the heavy compression and overdrive associated with electric-guitar amplifiers.

Microphone Input with Phantom Power

Channel 2 includes an XLR microphone input suitable for vocal and instrument microphones.

The input supplies phantom power for compatible condenser microphones and can also be used with conventional dynamic microphones. This gives performers greater flexibility when choosing a vocal microphone or capturing an additional acoustic instrument.

Full-Range Speaker System

The AS50D uses two custom 8-inch speakers alongside a dedicated 4-inch tweeter.

The 8-inch speakers provide body and midrange definition, while the tweeter reproduces the high-frequency detail required for natural acoustic-string attack, harmonics and vocal clarity.

This full-range configuration gives the AS50D a broader and more detailed response than a conventional electric-guitar amplifier.

Built-In Digital Chorus

The integrated chorus effect can be assigned to Channel 1, Channel 2 or both channels.

Dedicated Speed and Depth controls allow the effect to range from subtle width to a more noticeable modulation sound. It can add movement and dimension to acoustic guitar, keyboards and other suitable instruments.

Independent channel assignment also allows chorus to be applied to an instrument without automatically adding it to the vocal microphone.

Adjustable Digital Reverb

Built-in digital reverb adds space and ambience to instruments and vocals.

The Reverb Level control adjusts the total amount of effect, while the Reverb Balance control determines how the reverb is shared between the two channels.

This allows a performer to use a more spacious acoustic-guitar sound while keeping the vocal treatment subtle, or balance the effect in the opposite direction.

Practical Anti-Feedback Controls

Feedback is a common problem when amplifying acoustic instruments, particularly on smaller stages or when the player is positioned close to the amplifier.

The AS50D includes three tools for managing feedback:

• A Phase switch for controlling low-frequency acoustic feedback

• A Notch filter for cutting a problematic frequency

• A Frequency control for locating the frequency that needs to be reduced

These controls provide more precise feedback management than simply reducing the amplifier’s bass or overall volume.

Emulated DI Output

The rear-panel DI output sends an emulated signal to a compatible mixing desk, PA system or recording device.

This allows the amplifier to be used as a personal stage monitor while the direct signal is sent to the main sound system. It can also simplify recording when placing microphones in front of the speakers is impractical.

Dedicated Line Output

A separate line output can be connected to home-recording equipment and other compatible external devices.

This provides additional flexibility when integrating the AS50D into a recording, rehearsal or performance system.

Parallel Effects Loop

The parallel effects loop allows compatible external processors to be added to the amplifier.

Delay, additional reverb and other suitable effects can be connected through the Send and Return sockets while the original dry signal remains present within the amplifier.

The Reverb Balance control also influences how the effects-loop signal is distributed between the two channels.

Optional Footswitch Control

A compatible optional footswitch can be connected to switch the built-in chorus and reverb effects on or off remotely.

This is useful for performers who need to change effects between sections of a song while continuing to play.

---

Why Choose a Dedicated Acoustic Amplifier?

A dedicated acoustic amplifier is designed to reproduce the natural sound of an electro-acoustic instrument with greater clarity than a conventional electric-guitar amplifier.

Electric-guitar amplifiers deliberately shape and colour the sound through their circuitry and speakers. Acoustic amplifiers use a broader frequency response to preserve string detail, body resonance and the individual character of the instrument.

The AS50D also provides features aimed specifically at acoustic performers, including:

• XLR microphone connectivity

• Phantom power

• Anti-feedback controls

• A high-frequency tweeter

• Vocal-friendly digital reverb

• Direct output to a PA system

These features allow the amplifier to function as a compact performance system rather than simply amplifying one guitar.

---

Who Is It For?

Singer-Songwriters

The separate instrument and microphone connections allow one performer to amplify both guitar and vocals without carrying a separate mixer and PA system.

Acoustic Guitarists

The full-range speaker arrangement and feedback controls make the AS50D suitable for electro-acoustic guitars fitted with piezo or magnetic pickup systems.

Vocal and Instrument Duos

Two instrument inputs and an XLR microphone input provide useful flexibility for compact duo setups, rehearsals and intimate performances.

Multi-Instrumentalists

Channel 2 can accept sources including another acoustic instrument, keyboard or drum machine, making the amplifier useful for musicians who switch between instruments.

Buskers and Small-Venue Performers

The 50-watt output provides useful projection for cafés, bars, churches, rehearsal spaces and intimate live environments with access to mains power.

Home and Recording Musicians

The controllable output, line connection, DI output and effects loop make the AS50D useful for practice, songwriting and recording.

Players Using Condenser Microphones

The phantom-powered XLR connection supports compatible condenser microphones without requiring a separate phantom-power supply.

---

What’s Included?

• Marshall AS50D acoustic guitar and vocal combo amplifier

• Detachable UK mains cable

---

Technical Specifications

Specification	Details
Product Type	Acoustic instrument and vocal combo amplifier
Model	AS50D
Official Model Reference	AS50DV
Series	Marshall Acoustic
Amplifier Technology	Solid state
Output Power	50W
Channels	2
Channel 1 Type	Acoustic instrument channel
Channel 2 Type	Microphone and auxiliary instrument channel
Instrument Inputs	2 x ¼-inch jack
Microphone Input	1 x XLR
Microphone Phantom Power	Yes
Auxiliary Input	Stereo RCA/phono
Channel 1 Controls	Volume, Bass and Treble
Channel 2 Controls	Volume, Bass and Treble
Master Control	Master Volume
Built-In Effects	Digital chorus and reverb
Chorus Assignment	Channel 1, Channel 2 or both
Chorus Controls	Speed and Depth
Reverb Controls	Balance and Level
Anti-Feedback Controls	Phase, Notch and Frequency
Effects Loop	Parallel effects loop
Effects Connections	¼-inch Send and Return
DI Output	Emulated DI output
Line Output	¼-inch line output
Footswitch Connection	¼-inch jack
Footswitch Functions	Chorus and reverb switching
Speaker Configuration	2 x 8-inch plus 1 x 4-inch tweeter
Main Speakers	2 x custom STech 8-inch speakers
Tweeter	1 x STech 4-inch tweeter
Main Speaker Impedance	8Ω each
Unit Impedance	4Ω
External Speaker Output	No
Finish	Black
Width	565mm
Height	415mm
Depth	250mm
Weight	14.1kg
Designed and Engineered	United Kingdom
Country of Manufacture	Vietnam

---

Power Requirements

The Marshall AS50D operates from UK mains electricity using the supplied detachable power cable.

Before switching the amplifier on, connect the required instruments and microphones and reduce the two channel volumes and Master Volume. Once powered, gradually increase each channel to achieve a suitable balance before setting the final output with the Master control.

The AS50D uses solid-state technology and requires no valve warm-up period or routine valve replacement.

---

Setting Up an Acoustic Guitar and Vocal Microphone

Connect the Acoustic Guitar

Connect the electro-acoustic guitar to the Channel 1 instrument input using a standard screened instrument cable.

Begin with the Channel 1 Bass and Treble controls in their central positions before adjusting them to suit the instrument and room.

Connect the Microphone

Connect a compatible microphone to the Channel 2 XLR input.

Use the Channel 2 Volume, Bass and Treble controls to balance the vocal against the acoustic instrument.

Adjust the Master Volume

Set the relative balance between the two channels first, then use the Master Volume to control the overall output.

Add Reverb

Use Reverb Balance to determine how the effect is divided between the two channels. Increase Reverb Level gradually until the required amount of ambience is reached.

Manage Feedback

Position the amplifier carefully and avoid pointing the microphone directly towards the speakers.

Use the Phase switch first when low-frequency feedback occurs. Engage the Notch control and adjust the Frequency control when a more specific ringing frequency needs to be reduced.

---

Comparison and Alternatives

Marshall AS50D vs a Small PA System

A compact PA may offer additional microphone channels and wider audience coverage, but it normally requires more separate components and a longer setup process.

The AS50D combines instrument amplification, microphone connectivity, effects and speakers within one portable enclosure, making it particularly convenient for solo performers.

Marshall AS50D vs an Electric-Guitar Amplifier

An electric-guitar amplifier is designed to colour the sound and often uses speakers with a deliberately restricted frequency range.

The AS50D provides a cleaner, broader response that is better suited to the natural detail of acoustic instruments and vocals.

Marshall AS50D vs a Keyboard Amplifier

A keyboard amplifier may provide a similarly broad frequency response, but it will not necessarily include dedicated acoustic feedback controls, channel-assignable chorus or guitar-focused tone shaping.

The AS50D is purpose-built around acoustic performance requirements.

---

Frequently Asked Questions

Is the Marshall AS50D suitable for vocals?

Yes. Channel 2 includes an XLR microphone input with independent volume, bass and treble controls.

Does the microphone input provide phantom power?

Yes. The XLR input supplies phantom power for compatible condenser microphones and also works with dynamic microphones.

Can I connect two acoustic instruments?

Yes. The AS50D provides two ¼-inch instrument inputs. Each input is controlled through its respective channel.

Can I connect a phone or music player?

Yes. A compatible audio device can be connected through the stereo RCA auxiliary input.

Does the amplifier include chorus and reverb?

Yes. The AS50D includes adjustable digital chorus and reverb. Chorus can be assigned to either channel or both channels.

How do the anti-feedback controls work?

The Phase switch helps manage low-frequency feedback. The Notch and Frequency controls allow a specific problematic frequency to be located and reduced.

Can it connect directly to a PA system?

Yes. The emulated DI output can send the amplifier’s signal to a compatible mixing desk or PA system.

Can it be used for recording?

Yes. The AS50D provides an emulated DI output and a separate line output for connection to compatible recording equipment.

Does it have an effects loop?

Yes. It includes a parallel effects loop with Send and Return connections.

Is the effects footswitch included?

The compatible chorus and reverb footswitch is available separately.

Can I use standard acoustic-guitar effects pedals?

Yes. Effects designed for acoustic instruments can be connected before the amplifier or through the effects loop when appropriate.

Can I use a distortion pedal?

No. The AS50D is designed for clean acoustic-instrument reproduction. Marshall advises that distortion pedals should not be used because they can damage the amplifier’s full-range speakers.

Can I use a standard electric guitar?

The AS50D is specifically designed for acoustic instruments. An electric guitar can produce a signal through the input, but this amplifier is not intended to provide conventional electric-guitar tones or distorted sounds.

Does it have a headphone output?

No. The AS50D does not include a dedicated headphone connection.

Can an external speaker cabinet be connected?

No. It is designed to operate through its internal two-speaker and tweeter system.

Is it battery powered?

No. The AS50D requires a mains electricity connection.

Is it powerful enough for performances?

Its 50-watt output is well suited to rehearsals and intimate acoustic performances. The DI output also allows it to be connected to a larger PA system when additional audience coverage is required.

---

Fair Deal Music Verdict

★★★★★ 5/5

The Marshall AS50D is an excellent all-in-one amplifier for acoustic musicians who need clear instrument reproduction, vocal connectivity and practical performance features.

Its two independently controlled channels make it particularly effective for singer-songwriters, while the full-range speaker system preserves acoustic detail and vocal clarity. Built-in chorus, reverb and precise anti-feedback controls provide the tools required to create a polished live sound without an extensive collection of additional equipment.

For home practice, rehearsals, recording and intimate performances, the AS50D offers outstanding versatility in a compact and dependable format.

---

Why Buy From Fair Deal Music?

• Expert advice from knowledgeable musicians

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

• Competitive prices across our extensive product range

• Secure UK-wide delivery

• Flexible finance options, subject to status

• Friendly support before and after your purchase

• Trusted independent UK musical instrument retailer with decades of experience

Trade In. Trade Up. Save More.

Thinking about upgrading your current equipment? Fair Deal Music accepts guitars, amplifiers, effects, keyboards, drums, studio equipment and other musical instruments in part exchange.

Contact our team for a friendly, no-obligation valuation and put the value of your existing equipment towards your next purchase.