Electro-Harmonix Metal Muff with Top Boost
Electro-Harmonix Metal Muff with Top Boost

Metal Muff with Top Boost, Other guitar saturation effect from Electro-Harmonix in the Metal Muff series.

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All user reviews for the Electro-Harmonix Metal Muff with Top Boost

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Average Score:4.4( 4.4/5 based on 45 reviews )
 31 reviews69 %
 6 reviews13 %
 4 reviews9 %
 3 reviews7 %
 1 user review2 %
Value For Money : Excellent
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James...'s review"Mesa in a box"

Electro-Harmonix Metal Muff with Top Boost
Standard distortion box layout. Bass middle treble. Boost, volume, gain. Pedal is digital and I don't believe it's true bypass judging from my ears. Seems solid though. I actually had one of these years ago and recently bought one to see if I still liked it. Neither have had issues. Although they guzzle batteries quickly. I suggest getting line power.


First thing is first. The boost isn't really that usable to me. It changes the volume but also the tone, very drastically. It changes the tone so much that it's like you turned on another pedal or something. So I really never use it. You would think EHX would fix this. The knobs also have some odd tolerances and sometimes turning something just a notch can have a dramatic effect on the sound. I have to duct tape my knobs once I get the settings right or I'll bump them and ruin the sound. Overall it's not a perfect design in utility.


Here's what's good. If you feed this into a Fender or Fender style clean channel, it turns the amp into a mesa rectifier for all intents and purposes. Everyone is always looking for that high gain in a box pedal that doesn't sound like a bunch of flies buzzing around. This is that pedal. It's very defined and chunky gain. Probably one of the best recto simulators I've ever played. It isn't to be confused as a fuzz though. While the gain does have a fuzzy quality this is not a fuzz pedal.


It does have its functional flaws and the boost changing the tone is a big let down. Some players might not be as bothered by this. The sound is next to amazing and I'm chocked at how this can turn a very sterile clean channel into a full on high gain mesa lead channel. I'm not a fan of distortion pedals over overdrives but this one has impressed me continually.

yoTrakkz's review"thick and full "

Electro-Harmonix Metal Muff with Top Boost
The Electro Harmonix Metal Muff is an analog distortion guitar pedal. It has a 1/4 inch input and output and is not a rackable unit as it is a foot stomp box. It needs some sort of nine volt power to run on.


The configuration of the Electro Harmonix Metal Muff is really simple and straightforward. It simply has three knobs - one for distortion level, one for filer (EQ), and one for volume level. It is easy to get a thick sound from this and is easy to manipulate the different parameters to get a sound that suits your needs. I don't have a manual for this, so I don't know how useful it is when learning this pedal.


The distortion sound from the Electro Harmonix Metal Muff is really thick and full. I would recommend this if you are looking for some really heavy, metal-like distortion for your guitar. I have only used this with guitar and it probably isn't all that useful for other instruments or genres other than metal or hard rock. Turning the distortion all the way up will give you a huge tone that is great for getting that fat distortion tone heard on many metal records.


I've been using the Electro Harmonix Metal Muff for about two years. While somewhat narrow in its ability, for getting a thick distortion sound it sounds really great. I would use this more for big rhythm playing rather than lead, but will work fine for both. It is hard to find a pedal that has as thick of a tone as this and the price is dirt cheap if you can get one used and quite reasonable new. If you are playing heavy metal or hard rock and need a pedal that will give you a tone for these types of genres, this pedal is worth a definite look.

Everlone's review"Metal-meh"

Electro-Harmonix Metal Muff with Top Boost
The Electro-Harmonix Metal Muff with Top Boost is an analog distortion pedal. The “Top Boost” feature boosts certain frequencies for solos and has its own level control. It can be powered by 9 volt battery or the included power adapter.


The Metal Muff is extremely easy to use. It has six knobs and two buttons. It has a knob for the Top Boost level, gain, lows, mids, highs, and over all volume. One footswitch turns the pedal on and off and the other engages the Top Boost. I briefly glanced over the manual, but the pedal is so self explanatory there is almost no need for it.


I use the Metal Muff with a Gibson Les Paul Custom and a Guild S-300D. In my experience I have found that there are not a wide variety of USABLE tones in this pedal. The equalization knobs tend to have one, possibly two, sweet spots in their range of motion. Any more or any less and the tone becomes too harsh or too stifled. I actually think having the Top Boost engaged with the knob set to about 8 o’clock makes the whole pedal sound better and I will often leave it on all the time. This pedal has massive amounts of gain on hand. I usually keep the gain knob set anywhere from noon to 3 o’clock.


The Metal Muff has a ton of potential, I only wish it had a more user friendly EQ. J.D. Cronise from The Sword uses one for his distorted tone and it works extremely well for him. I would recommend demoing this pedal with the same make and model amp you own before buying. Knowing what I know now I probably would have gone with a different high gain distortion box. For now it will remain the back up distortion pedal in my rig.

mooseherman's review

Electro-Harmonix Metal Muff with Top Boost
The is a very heavy analog distortion pedal. The model I played had a sick feature called top boost. It can't be edited through a computer, and it's not rackable. It's got your basic 1/4" input and output, and has a power adapter.


The sound effects editing is pretty easy. There are six controls on this pedal. (Volume, Top Boost, Treble, Middle, Bass, and Distortion). The distortion knob controls gain, while the Top Boost function contributed to the higher end of your tone, making the aggressive sound of the Metal Muff better for heavier stuff. The manual explains everything pretty clearly, but it would probably only require one good read-through anyway.


This thing is one of the more intense distortion pedals I've ever played. I was curious to see how it would compare to its cousin, the more famous Big Muff. The main thing I noticed was the name was no joke; this is a metal pedal through and through. As such, its appeal is limited. I personally grew out of metal years ago, and I feel as though this pedal doesn't deliver the midrange that I love so much in the Big Muff. I also feel like the regular big muff has all the distortion I want, but also a lot more warmth than the Metal Muff. As such, I wasn't such a huge fan. A metal player who prefers early 90s and late 1980s tones (Dimebag Darrell, Metallica) might really dig this pedal. The top boost feature especially makes it cut through some of the more dense mixes, and gives your leads a piercing tone that really kills it. However, the lack of midrange sort of kills the pedal for me in my book, as it doesn't do any other genre much justice. It's too bland to be used in a rock context, especially since it's got sort of an artificial brightness. Metal isn't my thing, but if it was, I'd probably be using this guy a lot more.


I have to say, I like the sheer power that this pedal has. Sometimes if you're in the mood to create a lurching metal riff, you need just the right pedal, and this is certainly good for that. However, I usually demand more versatility out of my pedals. I don't think that this pedal is particularly versatile at all, in fact, its frustratingly monotonous. I think that for the price, it's not bad. Certainly metal players looking for a really good tone would be well-advised to spend a lot of money on this. However, I don't really think that it's worth it for anyone else. Other players would be well-advised to check out the other Electro Harmonix distortions for more variety, and incredible quality.
Audiofanzine FR03/08/2009

Audiofanzine FR's review

Electro-Harmonix Metal Muff with Top Boost
(Originally written by dimebag hammett/translated from Audiofanzine FR)
Analog distortion, no tube inside.

9-volt operation.

Made in the USA.

Very sturdy housing.


Ultra-easy configuration, no need for a user's manual:

- Volume control

- Three-band EQ (treble, mid, bass)

- Distortion control

Convenient Booster function.


The most important thing is that the sound is HUGE.

You can see what kind of music this pedal was made for just by looking at it, and its sound will only confirm that! Typical fat heavy metal distortion. If you turn up the Mid and Treble controls you'll get a typical 80's thrash metal sound and you'll feel the need to play "Seek and Destroy". I like a very hollow sound with loud lows and highs and almost no mids. The sound is very fat and palm mutes sound amazing (I play a Jackson DK2L with Seymour Duncan pickups).

The boost function increases the volume. Even though it changes the sound color it's perfect for solos. Don't turn the knobs all the way because the sound becomes awful.

I give it a 9/10 because of the boost function, which increases the volume a bit too much. Otherwise the pedal is perfect. I also thought about buying the Dime Distortion... If you are in the same situation, think about it before spending a fortune to get the distortion of our late master.


I've been using it for several months. I have a 40-watt solid-state Peavey Transtube Envoy 110 and I tested it also with a Laney HCM15R. This pedal provides really good results with every amp! I previously played a Lag Jet 100ML and now i have a Jackson with a mind blowing sound. Cons: the boost function, use it with care. The typical heavy metal look is a matter of taste... I personally like it :D.

Excellent value for money (I bought just when ts priced dropped so I got the Metal Muff at the price of a Little^^).

Based on my experience I would buy it again, even if the Dime Distortion is still one of the best distortion pedals for me. But this MM is a very good choice and I don't regret at all having bought it!!
Audiofanzine FR12/13/2008

Audiofanzine FR's review

Electro-Harmonix Metal Muff with Top Boost
(Originally written by valvamp/translated from Audiofanzine FR)
Analog distortion pedal without tube but with boost.

6 controls:


Top boost (level and high-frequency booster)





Dual footswitch:

Distortion bypass

Top Boost

Powered with a 9-volt PSU Made in the USA (New York), ultra rugged steel housing.


Very simple configuration, plug and play! All controls are very effective. I recommend you to avoid extreme boost settings otherwise you'll get a shrilling sound. I personally adjust the mid frequency range and the sound is perfect for palm mute playing. For high-energy rhythm parts, simply increase the distortion intensity on your amp. If you turn the distortion control more than halfway you'll get a pretty heavy distortion. The Metal Muff is faithful to its name: it cannot provide good crunch sounds but it does provide everything from 80's glam rock to grunge, to thrash and black metal. The distortion has a typical US character so Vox and Marshall fans should look for something else!!

The user's manual is not very useful since it only explains control functions. But you won't need more information.


Good quality distortion pedal. It's a nice analog unit that'll rock your socks off. The boost function is perfect for soloing but watch out for extremely high settings or you'll get really nasty highs!

This pedal gives you a nice metal sound both with EMG and Fender pickups.

For the same price as similar products from Boss and others you get a two-in-one pedal and a much better manufacturing quality!


I bought it a few hours ago after testing BOSS, Rocktron and Digitech products. The boost function and the American manufacturing are clear advantages, the 3-band EQ gives you much more versatility than a single tone knob, and the overall quality is good.

I wouldn't hesitate to buy it again!
MGR/Derek Mok04/16/2007

MGR/Derek Mok's review"Electro-Harmonix Metal Muff"

Electro-Harmonix Metal Muff with Top Boost
Primarily a singer, I've been playing guitar for about 10 years, been in a band (drummer!), and have continued to record and play with other musicians on a non-professional basis. My styles range from folk to hard rock, with heavy power-pop leanings -- Big Star, not Green Day.

I bought this pedal from Musician's Friend for $69.99 with a discount coupon.

Well, it has a lot of tweakable controls and a top boost function. The price is reasonable, the construction is pretty sturdy.

I just don't like the sound of this pedal. I usually like vintage-style distortion/overdrive, more Black Sabbath/Led Zeppelin than Metallica, and the tone of the Metal Muff was just wrong. I find its tone harsh, artificial, unresponsive to playing dynamics, and one-dimensional. The Top Boost function just makes the sound more papery, and the pedal sounds awful when paired with a Telecaster, and only acceptable with an SG equipped with P-90s. A Gibson Flying V with high-output humbuckers turned into bass mush with the Metal Muff, and the Top Boost only added a tinny edge, not true body or cut to the overall tone. I found myself preferring the natural overdrive of my Vox amp to the tone I get when I add this pedal, and the Metal Muff didn't behave any better with a Line 6 Pod 2.0.

Good, the pedal feels neatly put together and durable.

I'd hunted for a good all-purpose high-gain unit, and this Metal Muff didn't make the mark. My older Marshall Jackhammer had a more pleasing tone with more variations and more versatility, and subsequently I tried and bought the T-Rex Bloody Mary, which cost three times more than the Metal Muff but also blows it out of the water for tonal complexity, refinement, responsiveness and vibe. I had bought the Metal Muff because of its high rating in Guitar & Bass magazine, but I have to say, I really can't find much to recommend this pedal for. Maybe its sound appeals to somebody else, but definitely not me.

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

nicotinedu44's review (This content has been automatically translated from French)" it's worth it! Especially now ..!"

Electro-Harmonix Metal Muff with Top Boost
Analog distortion pedal with a boost

Connectivity: A jack in a jack out, simplicity itself!

A footswitch to bypass the pedal
A footswitch to bypass the top boost

A volume knob
3 knob for the EQ (bass, mid, treble)
A knob for the top boost
A knob for distortion


There's no easier, anyway, the effect pedal in general, there's not to take the lead!

I do not even remember that there was a manual

Editing sounds is easy, EQ can really sculpt the sound.
The top boost is .. "Bonus" for me!


Realistic for a guitar distortion yes!

Use with Strat & a lag roxane (see my column gear)

I always managed to draw what I wanted, it is practical, robust.

The top boost is very showy past 10am, but is a real plus if you typed metal. At the time I had bought for it elsewhere, and rock with good headroom, I conquered. Today it serves me more of the masses, because I work a lot on the amp simulation, but occasionally I spring to my surprise I get to have a good crunch despite being very typical metal.


Used for 6/7ans, I had taken over all it offers namely, EQ, and more Top boost, I have not tried other models before.

Good value at the time the report, though now I look at Cygnus, and it is worth nothing.

I'm not sure I would do this choice today, but I do not regret it.

Recommended for those who want big sound! Good pedal casually, complete, which will delight the wild metalheads, rockers and pain sensations ^ ^

guigue106's review (This content has been automatically translated from French)" nikel chrome"

Electro-Harmonix Metal Muff with Top Boost
What basic, input / output analog to hair


30,000 knobs are not so ca goes well, we turn we try we appreciate you keep


test with esp m2 deluxe, not a twist of c * r * chi for the right ca sending effective way


for the quality I would say bravo!

the distortion is clean, clear, sharp, precise and flawless and ca c is pretty good for the mind legato / prog.

the quality and texture of the sound of this pedal strangely reminds me :) can be inflames my m2 deluxe there is sth ....

The headroom on the distortion and really nice and c is not negligible for legato shred fan knob.

j 'have tested distortion (ds1, ds2, mt2, digitech death metal, H & K tubeman II and j' fast) to kick the sound is much less compressed and less muffled than my DM digitech.

ca ca exudes sense of cleanliness. the digitech death metal is a bit fatter, more slobbering and "deaf" but sounds bigger than the EHX.

for once I 'appreciate by far the sharpness of the EHX even if it sounds less heavy, it is clearer, drier, sharper and more accurate view even almost "velvety" to play progressive way "petruccinator"

the only real question was how little serve the damn knob "top boost" j love the doctored to transform the top boost and optimized scoop in the low and the middle muscles.

beyond the ca, ca sending more than well.

goldorock's review (This content has been automatically translated from French)" very good pedal"

Electro-Harmonix Metal Muff with Top Boost
analog is
is a: volume
top boost

button = boost as a second channel


or low mids or high-mids


The sound is warmer and the digital line 6 uber metal boss metal zone and ('fit-in well though too!)
the sound is 100% metal, cold, but it rings true compared to the pedals mentioned
its very good
is a top boost = more treble it adds another type of sound more fit-in


this pedal is great but I would have liked an even more devastating
otherwise, go to the side of the Fullbore metal, more direct, modern, cold
well rhythmic pantera
there really is no better otherwise have to go see the pedals lamps (the biggest and best solo)
vox bulldog has a more modern sound as