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Marshall JMD501

Review Marshall JMD501

Modelling Combo Guitar Amp from Marshall belonging to the JMD1 series

Written test
1 comment
Marshall JMD501 Review 16-in-1 Marshall

Every guitar player knows Marshall and its cult amp series that has been manufactured for over 40 years now. Sometimes praised, sometimes criticized – everyone has certainly heard about the Marshall Plexi, JMP and JCM800, some of which even became reference products. After the launch of a new all-tube series (JVM), a solid-state series (MGFX) and a tube/solid-state hybrid series (Valvestate), Marshall only lacked a tube/digital hybrid product range. Thanks to its cooperation with Softube (well-known for its software amp simulations), Marshall has now launched the new JMD:1 series entering the semi-digital area. Today, we'll take a deeper look inside the JMD501...


The JMD501 is the 50-watt combo version of the JMD:1 product family. As soon as you take it out of the box, you’ll immediately recognize the typical Marshall look: golden front, classic knobs, logo, typography… Nothing new on this amp! The dimensions are standard for a 50-watt combo (25" × 20.7" × 10") and it weights 50 lb. It features a 12" speaker, two EL34 power tubes and one ECC83 preamp tube.



Front panel

Marshall JMD501

On the front panel, you’ll find an input for connecting your guitar and a knob for selecting one of the 16 amp models available. You’ll have to read the user’s manual in order to know which hardware is being emulated: there are no “I’m a JCM800” or “I’m a JMP-1 with a Guv’nor” labels. You’ll have to settle for ambiguous descriptions like “Clean natural” and “Lead Classic”! Perhaps Marshall didn’t want to push it too far. Just read the user’s manual to find out the topology of each model.


Marshall JMD501

The front panel also includes a standard gain control, a 3-band EQ (bass, middle, treble) and a channel volume knob. All five controls work in different ways depending on the selected preamp model.


You have four channels to which you can assign any setting. And it also features a manual mode, which is very convenient to get an overview of the amps’ sound possibilities. There is also a foot switch included that allows you to toggle between channels/presets.


Like on Line 6 amps, a single control allows you to select and adjust one of the modulation effects. You can choose between gate, chorus, phaser, flanger, and a tremolo controlled by the Mod Depth setting; the speed rate is defined by the position of the Mod Adjust knob. Unfortunately, it is impossible to mix two effects. The amp also provides a delay effect with tap tempo and different modelings that affect repetitions (Hi-fi, Analogue, Tape and Multi). Apart from that, the JMD501 includes a digital reverb. All in all, thanks to its effects and control possibilities, the amp proves to be a very comprehensive tool. The presence knob is placed at the end of the signal path, just before the master volume control. Finally, also notice that the amp is equipped with power and standby switches.



Rear panel

Marshall JMD501

The JMD501 is generous when it comes to connections! You have additional speaker outs at your disposal: one 16 ohm out, one 8 ohm out and two 16 ohm outs, plus an effect loop with send/return connectors, a +4dB/-10dB level selector and a mix control.


Marshall JMD501

The preamp output allows you to connect the JMD501 preamp to an external power amp. This connector also works when the amp is in standby mode (Silent Recording mode). The same applies to the phones output which allows you to play guitar with the sound of your amp without disturbing your whole neighborhood (in standby mode the speaker output is muted).


A line input adds the possibility to connect a line-level source (MP3 or CD player) to play along with your favorite songs. The amp also features an Emulated Line Out on XLR that emulates the miking of a 4×12" speaker cabinet. Just like the headphones and preamp outputs, you can use it silently in standby mode.


Marshall JMD501

The Footcontroller input is dedicated to the supplied foot switch, but the amp can also be controlled via its MIDI in and out. By the way, using the foot controller is somewhat complex in the beginning. I had already tested the foot controller of the Marshall JVM210H, which is a bit unpractical (pressing a switch for the second time allows you to change mode — green, orange or red — without changing channel). The JMD501 foot controller includes six switches and allows you to store up to 28 presets directly in the Preset Store mode. You can also assign some switches of the front panel to the foot controller: manual, channel 1–4, modulation on/off, delay on/off, tap tempo, FX loop, and compare.


Now, the time has come to experience the sound of this unique amp!


Want to eat your cake and have it too?

The philosophy behind this new series is that, based on the same tube amplification (two EL34 in the JMD501), a digital preamp stage (including an ECC83) allows you to get almost any possible guitar sound from the best Marshall all-tube amp heads. This digital technology patented by Softube is called “Natural Harmonic Technology”. Here is the list of the preamp models available:


* Clean 1 Modern: Marshall JVM410H preamp, Clean channel in Green mode.

* Clean 2 Full: Marshall JCM2000 DSL100 preamp, Clean channel with Tone Shift on.

* Clean 3 Classic: Marshall JMP-1 preamp, Clean 1 with Bass Shift on.

* Clean 4 Natural: JMD:1 preamp with flat response (the amp’s first own and new sound).

* Crunch 5 Vintage: Mix of Marshall’s 1959 and 1964 preamp.

* Crunch 6 Classic: Marshall JCM800 2203 preamp.

* Crunch 7 Deep: Marshall Haze 40 preamp (new tube amp made in Asia).

* Crunch 8 Full: Marshall 1974 preamp.

* Overdrive 9 Classic: Marshall JMP-1 preamp with OD2 preset.

* Overdrive 10 Modern: Marshall JVM410H preamp, Crunch channel in Red mode.

* Overdrive 11 Deep: Marshall JCM 800 2203 preamp + Bluesbreaker II stompbox in boost mode with maximum drive.

* Overdrive 12 Detuned: Marshall Mode Four preamp with Scoop Mode on and Tone Matrix on 3.

* Lead 13 Deep: Normal channel of the Marshall Haze 40 preamp with Boost and Bright on + Bluesbreaker II stompbox in boost mode with maximum drive.

* Lead 14 Solid: Marshall Guv’nor stompbox.

* Lead 15 Classic: Marshall JCM2000 DSL100 preamp + Bluesbreaker II stompbox.

* Lead 16 Modern: Marshall JVM410H preamp, OD1 channel in Orange mode.


The sound samples were recorded at UFO Studio, Paris (France) using a Chandler Limited TG2 mic preamp, a SHURE SM57 dynamic microphone and a BeyerDynamic M160 ribbon microphone, all going into a Digidesign 192 I/O audio interface. All simulations were recorded with a Gibson Les Paul Custom 1978.


Marshall JMD501

After listening to the sound samples, you’ll realize that there are good things… and also bad things! The amp controls (gain and EQ) respond very differently depending on the selected simulations – which increases the sound possibilities. The sound results are interesting, even if some simulations disappointed me a bit, especially the clean presets (modern and natural) where the high frequencies don’t have the warmth and round character of tube amps. Extreme presets sound a bit too muddy and compressed, and feedbacks are easily generated! I must confess that I really like the crunch presets of this amp. They surprised me a lot, especially the vintage and classic settings – they sound great. The overdrive presets are also very usable, some of them sound good (overdrive modern, overdrive deep and overdrive classic) while others don’t (overdrive detuned).


The overall quality of the effects is good, especially the modulation effects and the delay, which offers a lot of features (tap tempo, tape effect for the repetitions, etc.). Like many other digital reverbs, this one also sounds a bit imprecise at high output volumes.


Now it’s your turn to listen to the samples:




Overdrive Deep
  • Overdrive Deep00:13
  • Crunch Classic00:11
  • Overdrive Classic00:11
  • Clean Natural00:33
  • Lead Classic00:13
  • Lead Solid00:13
  • Clean Classic00:32
  • Lead Modern00:18
  • Crunch Deep00:11
  • Overdrive Modern00:11
  • Clean Modern00:22
  • Crunch Vintage00:11
  • Lead Deep00:14
  • Crunch Full00:11
  • Clean Full00:22
  • Overdrive Detuned00:13



Clean Flanger
  • Clean Flanger00:23
  • Crunch Reverb00:16
  • Clean Tremolo00:24
  • Clean Phaser Slow00:18
  • Crunch Delay HiFi00:22
  • Clean Chorus00:24
  • Crunch Chorus00:18
  • Crunch Delay Tape00:22
  • Clean Phaser Speed00:28


Here is what Marshall had to say about the JMD Series back in Musikmesse 2010:



Marshall promised to revolutionize amp technology by offering a sort of summary of their legendary amps in a single combo – and everything for just under $1,200. Reality looks very different: the price is a bit high compared to it competitors and the amp is not very versatile because the modelings are limited to Marshall amps. The cheap character of some presets disappointed me a bit (especially the clean sound), although the crunch presets sound very good and the modulation effects are quite convincing.



  • Crunch sound!
  • Good modulation effects
  • Comprehensive rear-panel connections
  • Supplied with a foot controller
  • 16 different simulations


  • Price
  • Clean sound a bit too cheap
  • The “war-machine” foot controller


  • reg parsons 1 post
    reg parsons
    New AFfiliate
    Posted on 10/28/2012 at 06:45:58
    ive got the jmd 1 100 watt head and cabinet...got say great amp...i kinda dont know what the reviewer is talking about...the detuned setting on this amp is probably the best...add a bit of chorus to it and you got a killer setting...i like 1...6...9...12...and 16 the most

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