Electro-Harmonix Small Stone Mk4
Electro-Harmonix Small Stone Mk4

Small Stone Mk4, Phaser for Guitar from Electro-Harmonix in the Small Stone series.

All user reviews for the Electro-Harmonix Small Stone Mk4

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Average Score:4.2( 4.2/5 based on 18 reviews )
 10 reviews56 %
 4 reviews22 %
 4 reviews22 %
Value For Money : Excellent
Buy at Sweetwater

iamqman's review"Big old Pedal"

Electro-Harmonix Small Stone Mk4
Electro harmonics nano small stone phaser pedal is very like the MXR pedals. This one has a single control knob that just takes the effected phaser signal all the way up to pulsating signal. It's very simple design and extremely easy to use in overall it's a very cool pedal. The casing itself is right along the lines of the rest of the Electro harmonics product lines. It's just a simple silver or gray box as a usually use on many other other products. You also get a small little switch that changes the voice on this box. You can play around with this switch to better color your tone to you amp, effect pedals, and instrument. This pedal is one of the original boxes that they used with their effects series pedals. They has since re-sized the box to a smaller one which fits on the pedal board much easier. All the same tone and feel is in this box as the smaller ones.


This box goes more in line with the boxes EI uses for their Big Muff distortion/fuzz pedals. This is a very simple design as it only has a single control knob switch and a single color switch. This case itself is very small and fits pretty easily on any pedal board or rack unit. You don't really need a manual because it has one switch and one control an knob and any monkey could probably figure out how to use this devise.


The only reason to buy this one over the compact is that this looks like the old EI products. If you like the tone of the original MXR phasers then you will like the sound of this effect. They don't sound that great in a clean setting but when you give it some distortion then it really get a very usable and cool sound. If you have ever listened to any early Van Halen album then you have probably heard a phaser in action. Of course it wasn't this particular model but the sound is the same. It i a cool pedal to have on your pedal board to use sparingly but not all the time.


Overall this is a very cool pedal to own and I think every guitar player should own one of these at some point . Whether that be this one of another the phaser pedal is very usable and very fun to play with. This pedal is a very good quality item and at the price new you can't really beat that. You can find them for right at around 480 which is an excellent price for this unit.

mooseherman's review

Electro-Harmonix Small Stone Mk4
This is a phase effect made by one of my favorite companies, Electro-Harmonix. It's an analog pedal that has been around for decades. It doesn't have any Mac/PC capabilities, and isn't MIDI-controlled or rackable.


The editing on this pedal couldn't be simpler. There's the basic 1/4" in and out. There's a knob that allows you to change the rate of phase shift. There's also a switch that changes between two color modes, which each have their own unique properties.


I like using this with my old-school setup, my Strat and Fender Twin. I like this phase because it has a classic vibe that I've heard in later Zeppelin and Floyd songs. These are some of the only records, along with a few other from their era, that actually have a phaser sound that isn't cheesy to my ears. This pedal has true bypass, so when it's off, it doesn't color your sound at all. It gives it a sound that will give your amp a color that isn't typical in phasers nowadays. It's a lot warmer and less "futuristic" sounding than you'd expect. It also doesn't make the sound "muddy" at all, which is what I hate in most phaser/chorus/flanger type effects. It's a bit more drastic than the phase 90, yet still doesn't go over the top. I've been able to emulate so many classic tones with it that I can't even count them all. Sometimes when cranked, it produces a little too much ambient noise for my taste, but this is easily avoided.


I like the fact that this pedal isn't particularly expensive (around $75 usually). I think that for that price, it's not a bad deal at all. I sometimes would prefer this to my usual go-to, the phase 90, when recording guitars (the Phase 90 is better all-around). The warmth and range you get with this can really be inspiring. I would be tempted to use this often, especially since it reminds me so much of Jimmy Page. I'm sure many people would find plenty to like in this pedal.
Audiofanzine FR12/11/2008

Audiofanzine FR's review

Electro-Harmonix Small Stone Mk4
(Originally written by charlou la fouine/translated from Audiofanzine FR)
Analog phaser.

It's great if you're looking for a phaser, so I give it a 10...

If you're not looking for a phaser, it's not the right tool ...


The configuration is too complicated. I had to call NASA engineers to get some help and we spent three months finding out how to turn a knob and depress a switch...

The possibilities are very limited for people who like to experiment, but if you're one of those you'd better buy a factory not this pedal. With this pedal there's only one way to go!


Good and warm effect but with some volume loss... This is the weakest point of the pedal...

I use it with my Flying V and my Yamaha RGX 620DZ connected to an Ashdown 60DSP amp head and it works pretty good... Except for the irritating level drop...


I've been using it for two years and I think it's a good phaser for people who want to try out this sort of effect. If you want more than that buy another tool (especially considering the level loss which is unbearable)... I hadn't tried out many other phasers before so it's a getting-to-know thing for me and in that sense it's ok...

A bulky effect pedal with average value for money. I don't think I would buy it again because I want another phaser sound, but I recommend it anyway...

One last tip to wrap it up: if you depress the switch and turn the control fully up you get a very funny "bubble" effect which is great to anger your bandmates during rehearsals.
Audiofanzine FR12/10/2008

Audiofanzine FR's review

Electro-Harmonix Small Stone Mk4
(Originally written by sonnyscallywag/translated from Audiofanzine FR)
Old-school phaser... Analog, solid-state pedal.

The PSU connection could be a problem... But if you wanted to get creative you would go buy a PSU with 1/8" plug and you wouldn't have a problem.


Very easy setting... Just plug in and you already get the right sound character... Don't complicate yourself! There's one knob to control the effect's speed and one switch to select between phaser and shifter, and it's more than enough!!!

No need for a user's manual.

You can easily set the rate, and switch between phaser/shifter with your foot. The setting won't match your drummer's beat perfectly but that's not necessary for a phaser effect anyway (it's not a delay).

People that say foot setting is impossible with this pedal should tell me how they manage with the Boss and its four tiny controls.


This pedal is a real vintage phaser, not a gizmo that requires 30 years of use to produce the sound you want, or a toy with 36 useless controls.

It sounds good right away. The secret to get more or less effect is the speed control.

Some people might say they want a very fast effect with a low mix but that's nonsense because high-speed phaser is always clearly audible.

The unit produces a warm sound and THERE IS NO VOLUME LOSS on the contrary to what a person here wrote (check the condition of your gear before writing a review... especially when 95% of the users say the opposite of what you think).


I've been using it for a couple of days and it produces exactly the sound I was looking for.

This effect sounds vintage and doesn't alter the guitar's tone.

I tried out the Boss but it has no vintage character even though it tries really hard. I also tested the Fender which also has a very comprehensive foot control but it doesn't sound like I want. I tried out the Maxon (copy of the '74 MXR Phase90) but you don't have the option to choose between phaser and shifter. I tested the EHX WORM but the pedal's function is different (Auto wah, tremolo, etc.)...

I would buy it again a dozen times because it's exactly what I was looking for. If I hadn't tested it I would have bought the Maxon Rotary Phaser. It's not the same price and in the end I found exactly what I was looking for with the Small Stone.


MGR/Anonymous's review"Electro-Harmonix Small Clone EH 4600 Full Chorus"

Electro-Harmonix Small Stone Mk4
I got it from a music shop down in london.
I think it was around £80 ($90-$110).

The "plug and play" type model has a brilliant sounding chorus which is great if you play in a bluesy type band.

The adapter for the pedal probably does'nt exist anymore and wear shoes because the switch does your foot in. You have to screw the bottom open to put the battery in.

Hard, lasted around 30 years, still in production.

Overall, good pedal, good construction and great sound. If you like the Smashing Pumpkins, Billy Corgan use's the E.H Small Stone.

This review was originally published on http://www.musicgearreview.com

sonic75's review (This content has been automatically translated from French)

Electro-Harmonix Small Stone Mk4
Pedal "phaser" Analog ...


You press the button and the pot is turned ... Nothing more nothing less


Used with my Nordlead is perfect for WYD atmosphere ...


The sturdy, quality, perfect

scofi's review (This content has been automatically translated from French)" AC is the User does so with a master loop"

Electro-Harmonix Small Stone Mk4
Japan! like other


as friends


Then here's what's wrong:
-The sound?? oh yes it is very good with a range of choices hell! depending on how you set the dial and 2-position or color! .
-SAVE THAT! This pedal eats all the potato on your guitar! its just plain a loss of 50% volume! and saturation much! .. So the big problem.
-So what!: Either pull out the soldering iron to change the 2 resistors that generate this problem.
- Or place it in a loop (loop pedal effect)! (Ex Tonebone (loopbone) and you will not lose the signal from your favorite gratoune as you pass the 2 signals simultaneously and it is only happiness.
"It is often the problem with this kind of mark down signal and / or heavy staining.


It's been a while now and I use it in a really good sound when used with a block effect loop pedal! otherwise you will be disappointed by its tendency to suck your sound!.

Always try before you buy !!!!!!!!!!!!!!!!!!!!


adperr's review (This content has been automatically translated from French)

Electro-Harmonix Small Stone Mk4
analog phaser pedal
1 input and 1 output jack
1 input power supply jack (3.5)
1 Knob that manages the speed of the effect
1 switch color (2 different magnitude of effect)


I rarely use because miennne is an old model that I bought used and it is not true bypass


the sound quality is good and easy to get (there are only two buttons)
poatr do not push the speed too high if one has the impression of playing in water
but with proper adjustment is obtained a very nice phaser
I personally use it only in its clear, distortion it gives some weird sound soup


good effect, but mine (a certain age) has no true bypass and not color the sound bad even when the pedal is off
more on this old model there is no light (I think the new editions are filled) the forgotten cause
model on my entry for the power supply has a reverse polarity compared to other pedals so when I plug on my PSU (a eagletone PS 12) it freaks me the power supply in a carafe, so I am obliged to USE THE battery power supply or other external

I do not put this pedal in my pedalboard but I keep it for use of rare because the sound is still pretty cool

Eяяаtom's review (This content has been automatically translated from French)" Plug & Play!"

Electro-Harmonix Small Stone Mk4
1 Indeed, 1 SETTING THE speed, a two-position selector 2 colors diffrent




Excellent sound quality, analog sounds, pleasure


the +
. his warm, soft, vintage .... hypnothique

the -
. lgre lower volume
. little rglages

Adrimed's review (This content has been automatically translated from French)

Electro-Harmonix Small Stone Mk4
Electro Harmonix Small Stone (Mk4) Phaser 100% analog.
Power over 9volts battery or mains plug but with the ameriaine a bit boring.
Between 1/1 output jacks.
True bypass with pretty beefy switch (click makes a big engagement!)
1 Rate knob (speed) 1 switch color.
Pedal quite massive, nice look we adopt it instantly.


Nothing easier:
Rate for the speed of phaser, knob allows gradual well be contrler foot also.
The switch supports two color position saying:
up = phaser with acute rsonnance position.
down = rsonnace serious position.


Big sound with super hot Analog flange defines good and progressive, we will Phaser hovering the Boullie psychedelic dulcore ...

But however well known big problem of the Small Stone:
She eats all your signal, basically I recommend using this pedal in an effects loop, the problem is not even excellent, but live branch she eats everything and position rsonnace acute she blows! ADOPTED kind when you hear you play the oscillation of the phaser afterfact!
Position 2 (severe rsonnance) is particularly Russia, some compare Uni-vibe.

So if you want to fully enjoy this phaser kidding in your effects loop!


Very good report qualitprix shame it is not more complete!
A Small stone with a mix knob of the effect more rigorous for a second to oscillate between rsonnance severe / acute progressive fawn and this would be the Top!
Why do not they seek to improve the well-known vintage phaser with EH? Enigma ...