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How It Sounds
Okay, let’s talk TONE, in capitals, for a reason. I am usually unlucky in the factory preset department, and historically have had to program my own patches to make use of whatever preset-enabled gear I am using. The JMD:1's factory presets are, however, quite useful. The most I had to do was turn the effects off since I was enthralled with the amp tone and not ready to play with mods and delays. The overdrive and distortion tones are Marshall all the way. Big, fat, excellent beef on the bottom and warm, bright highs on the top. The tone sounds much bigger than the physical size of the amp—not just loud, but big. No doubt having two 12" speakers helps here—so much so that I find it hard to go back to the 1 x 12s I am accustomed to lugging around with me. Saturation on the heavy distortion settings is both heavenly and wicked at the same time with very accessible feedback. In all the overdrive/distortion settings I played through, the amp just plain delivers. Sustain was excellent, and it responded naturally to the standard assortment of playing techniques. Every sound I wanted my guitar to make was transmitted accurately at any volume level I could get away with.
With that said, there is an inherent tightness in the sound. Is that a byproduct of digital simulation? Possibly. It wasn't necessarily bad, and the fact that I expected it may be a byproduct of being accustomed to tube amps that can be inherently unforgiving and raw when cranked, and tepid when turned down. Perhaps the relatively compact size and partially closed cabinet had something to do with it. At low, bedroom levels, the digital preamps offer as much distortion as you can take. And at bad neighbor volumes, the tightness was perhaps a bonus, as the tone remained highly defined and highly focused as opposed to just another loud overdriven valve amp. In addition, each distortion preamp retained its character at all volume levels.
Marshall's JCM800 has always been a favorite of mine, and more than any other Marshall amp, it exemplifies the Marshall overdrive sound. So it's no surprise that the JCM 800 model on this preamp was likewise my favorite. At high-gain settings especially, it is a very accurate representation of that classic amp. And the JCM2000 Dual Super Lead model accurately recreated classic tones from Gary Moore and Robin Trower with just a few tweaks to gain and EQ. Another accurate repro was the JVM410H preamp model, which took little effort to coax out some heavy metal tones a la Slash.
I could go on about the tone of the overdrive and distortion settings, but the amp has clean tones as well. Prattling on about clean tones on a Marshall feels a bit like talking about reverse gear on a Porsche, but they’re there for a reason. The pure clean tones had a definite Class A/B vibe to them, and some of the clean presets sounded a tad compressed. Musical but somewhat neutral, with super clean settings, the tone was just sort of there. Ah, but dial in a bit of crunch by either changing preamp presets (I chose the Dual Super Lead 100) or bringing up the preamp gain (stick with the DSL100), and a much needed dose of Class A character enters the picture, like Tom Joad in a John Ford film. No longer overly pristine and polite, the amp sounded man-made again—its anger in check, its soulful lament in heart wrenching bloom. Americana tones from a British bastard with a high brow Swedish education. Frankly, it's the first time I enjoyed playing a Marshall clean longer than five minutes (though I’ve never owned a Plexi). It also reminds me that at high gain settings, amps with digital preamp stages do not clean up as nicely via your guitar's volume knob compared to their all analog counterparts. Luckily there are enough clean tone models to switch over to.
The Effect of FX
Okay, so what are all those flashing red LEDs doing on a Marshall amp anyway? Face it, effects like modulation and delay are now standard fare on amps. Their practicality can be debated endlessly, and while no one buys a guitar amp because they like the delay, hey, they're here, we may as well use them. The usefulness of onboard effects often comes down to how easy it is to turn them off, and the JMD:1's well-designed footswitch succeeds in this regard.
The JMD:1's effects are based on Marshall stompboxes and include Delay, Modulation, and Reverb. The Reverb is what you'd expect on a modern amp—one knob, no springs. Of the four delays to choose from—Hi-Fi (pure digital delay), Analog, Tape, and Multi—the Analog and Hi-Fi were the best of the bunch. The Multi is a two-tap delay line with analog-style decay—I find digital delay repeats on multi-taps a la The Edge far more useful. The delay controls consist of a Delay Level knob, and an on/off switch that can be used for tap tempo, and can be assigned to a footswitch when the foot controller is in Switch Mode. Delay types, like the modulation types, are selected using the Delay or Mod Adjust knob respectively.
The four mod effects are Chorus, Phaser, Flanger, and Tremolo. Modulation controls consist of a Mod Depth knob and an on/off switch that can also be assigned to a footswitch. The limited access to effects parameters means you're at the mercy of the factory's tastes. The Chorus is totally usable, though I would go with a stompbox over the JMD:1's Phaser and Flanger. The Tremolo's speed has limited adjustment via the Mod Adjust knob, which hamstrings its usefulness. Turning the Mod Adjust knob hard left engages the noise gate, the threshold of which is controlled by the Mod Depth knob. The attack and release settings for the JMD:1's gate are hard-wired at the factory and very well done. So much so that I found myself using the gate over any mod effects—I have loads of pedals strewn across the floor anyway. This amp has me convinced that any amp offering heavy distortion should include a proper gate—the two go hand in hand.
With 16 different digital preamps to choose from, and the amp's primary controls adapting to the amps those preamps emulate, Marshall's JMD:1 series guarantees something for everybody. And likewise, you will probably find tones that don't satisfy your appetite. That's variety for you. The amplifier feels well made and thoughtfully engineered. Marshall may rattle a few rusty cages as they evolve into a modern amp company using cutting edge technology. Blame that on their legacy, I suppose. Fortunately, with the JMD:1 series, they have done a fine job blending modern with vintage for another great sounding amp with the iconic gold faceplate and white, cursive logo.
you need a loud versatile amp with great distortion and overdrive tones
you're a purist at heart and digital still doesn't do it for you, or you primarily use clean tones.
Street $1199 - Marshall - marshallamps.com