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Electro-Harmonix XO Knockout Attack Equalizer Guitar Effects Pedal 

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The Electro-Harmonix Knockout Pedal can give your tone the heavyweight punch it deserves. Two powerful filters are the key -- make your humbuckers so...Click To Read More About This Product

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OVERVIEW

Turn your guitar into a sonic chameleon!

The Electro-Harmonix Knockout Pedal can give your tone the heavyweight punch it deserves. Two powerful filters are the key -- make your humbuckers sound like single coil pickups and your Strat sound like a Tele. Amazing on bass!

The Knockout Attack Equallizer lets you tweak the high-pass and low-pass filters, changing your sound from Gibson to Strat to Telecaster, with innumerable shades in between.

FEATURES
  • Controls: Low, Dry, High.
  • 1/4" input and output
  • DC power input for battery replacement.

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Reviews
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Review Snapshot

by PowerReviews
Electro-HarmonixXO Knockout Attack Equalizer Guitar Effects Pedal
 
4.7

(based on 13 reviews)

Ratings Distribution

  • 5 Stars

     

    (12)

  • 4 Stars

     

    (0)

  • 3 Stars

     

    (0)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (1)

100%

of respondents would recommend this to a friend.

Pros

  • Excellent sound quality (3)

Cons

No Cons

Best Uses

  • Performances (3)
  • Professional recording (3)

Most Liked Positive Review

 

Hidden Gem

Really surprised this pedal is not more popular among guitar players. I found the EHX Knockout to be a great tool for sculpting your basic tone at the beginning of my signal chain. I...Read complete review

Really surprised this pedal is not more popular among guitar players. I found the EHX Knockout to be a great tool for sculpting your basic tone at the beginning of my signal chain. I love both Les Pauls and Stratocasters but could never find a tool to help get that "in between" sound of both guitars. The Knockout comes the closest to achieving that goal. It definitely removes much of the muddiness inherent in humbucker pickups while adding some of the sparkle found in single coils. This is a subtle pedal and if you max out any of the controls it sounds bad. If, however, you spend a little time to dial in the right mix of low-pass, dry, and high-pass filters you will be pleasantly rewarded. If you want to add some sparkle to your Les Paul style guitar I would recommend you give it a try.

VS

Most Liked Negative Review

 

Amazing if you don't mind noise

I have this and I am returning it. It sounds amazing, but it's too noisy to be used with a clean set up. I used it with and without a Boss Compressor and...Read complete review

I have this and I am returning it. It sounds amazing, but it's too noisy to be used with a clean set up. I used it with and without a Boss Compressor and it had the perfect country snappy tone, but again, the noise ruined it for me

Reviewed by 13 customers

Displaying reviews 1-10

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(4 of 5 customers found this review helpful)

 
5.0

OUTSTANDING!!!

By Camurai

from Maine

See all my reviews

Comments about Electro-Harmonix XO Knockout Attack Equalizer Guitar Effects Pedal:

This isn't an EQ pedal. It's insulting to compare it to something so simplistic. This is a tone shaping pedal. You can use this little wonder to make any guitar sound similar to almost any other guitar. Freaking amazing! If you're a tone freak like me, buy this pedal and start tweaking!

(2 of 2 customers found this review helpful)

 
5.0

Knocked Out!

By Buck

from Shepherdstown, WV

About Me Experienced

See all my reviews

Pros

  • Excellent Sound Quality

Cons

    Best Uses

    • Performances
    • Professional Recording

    Comments about Electro-Harmonix XO Knockout Attack Equalizer Guitar Effects Pedal:

    I wanted an equalizer pedal and researched and debated about several different ones and then, in a last minute decision, bought this thing. My tone has improved tenfold and now without the Knockout my guitar just sounds flat to me. It's quiet, simple and the price is right. This was the secret sauce that I've been looking for. Thanks EHX, you win again.

    (2 of 2 customers found this review helpful)

     
    5.0

    Hidden Gem

    By Bruce Allen

    from Delaware

    About Me Professional Musician

    See all my reviews

    Ask me a question

    Pros

    • Compact Design
    • Excellent Sound Quality
    • Good Selection Of Effects
    • Responsive
    • Versatile

    Cons

      Best Uses

      • Amateur Recording
      • Events
      • Home Studio
      • Performances
      • Professional Recording

      Comments about Electro-Harmonix XO Knockout Attack Equalizer Guitar Effects Pedal:

      Really surprised this pedal is not more popular among guitar players. I found the EHX Knockout to be a great tool for sculpting your basic tone at the beginning of my signal chain. I love both Les Pauls and Stratocasters but could never find a tool to help get that "in between" sound of both guitars. The Knockout comes the closest to achieving that goal. It definitely removes much of the muddiness inherent in humbucker pickups while adding some of the sparkle found in single coils. This is a subtle pedal and if you max out any of the controls it sounds bad. If, however, you spend a little time to dial in the right mix of low-pass, dry, and high-pass filters you will be pleasantly rewarded. If you want to add some sparkle to your Les Paul style guitar I would recommend you give it a try.

      (2 of 2 customers found this review helpful)

       
      5.0

      A Knockout indeed!

      By Dwindhym

      from Shreveport, LA

      See all my reviews

      Comments about Electro-Harmonix XO Knockout Attack Equalizer Guitar Effects Pedal:

      The Electro-Harmonix Knockout Pedal is seriously one of the most convenient pedals I've ever used! I'm not sure how to explain it...but it's the perfect secret to getting that perfect tone you have in your head! I've spent so much time with equalizers and boosters trying to get the right sounds out of my strat...but with this thing I sat down and dialed in a mighty Les Paul metal tone in moments! Some may find fault with the simple controls, but I think it only adds to the convenience! You don't have to sit for three hours playing with knobs and sliders. You just turn and go. I dig it.

      (2 of 2 customers found this review helpful)

       
      5.0

      A Must

      By Lounge King

      from Europe

      See all my reviews

      Comments about Electro-Harmonix XO Knockout Attack Equalizer Guitar Effects Pedal:

      Swell desert island pedal-it does what they say it does just great. Here's my angle on it- it also works fab on an acoustic guitar with pickup going into an electric guitar amp (if you don't have an acoustic guitar amp). I tried it on my acoustic running into a Vox DA10 and it sounds wonderful. An acoustic guitar into a electric git amp otherwise sounds pretty honky and mid-rangy and unlovely but this pedal changes all that. Highly recommended for all sorts of applications. I bought a second one.

      (2 of 2 customers found this review helpful)

       
      5.0

      A Little Heavyweight Contender

      By Anonymous

      from Undisclosed

      Comments about Electro-Harmonix XO Knockout Attack Equalizer Guitar Effects Pedal:

      I own a Epiphone Valve Junior head and Cabinet so I needed a little control over my eq. I purchased the Electro-Harmonix Knockout pedal, and it gave it just the sparkle, edge and low end punch without being overly harsh like so many EQ's tend to do. Like all EQ's you need to find a sound you like. I especially like the middle knob label 'Dry'. This knob has special filters so you can tweek your mid's and take out the upper mid harshness out of a lot of humbuckers. Then you can tweek it the other way and beef up your skinny coils, (I mean single coils:) Over all I rate it a 4.5. Good sound and good value for the money.

      (1 of 1 customers found this review helpful)

       
      5.0

      Odd but useful

      By -jim

      from NY/Nashville

      About Me Professional Musician

      See all my reviews

      Ask me a question

      Verified Buyer

      Comments about Electro-Harmonix XO Knockout Attack Equalizer Guitar Effects Pedal:

      I couldn't figure out exactly what it is from the description or youtube reviews so I bought one. I'm not sure why they call it an 'attack' EQ because it doesn't appear to alter the actual attack (like a BBE sonic maximizer) but it is an EQ.

      The center knob controls the dry signal level, set around two O'clock with the other knobs down makes this a buffer with some clean boost available. The right knob brings in some high end, no mids just really hi-end. The left knob brings low end, kind of sounds like having the tone knob on the guitar all the way down. With the center knob up you can get a (very) little low cut when you first bring the left knob up but by the time your around ten O'clock it's boosting the lows.

      I tested it ahead of my dirt pedals and it definitely can alter your distorted tones. I haven't tried it after but I'm thinking it can do some interesting shaping and/or boost after distortion too. It's different than a graphic EQ and can definitely improve or destroy your tone depending on how you twist the knobs.

      Right now I'm looking at as a utility tool for when you can't quite get that perfect tone - I'm mostly a studio player so the live guys might see a permanent place on the pedalboard for it - even if it's just as a boost (or anti-boost, use it to cut the volume but thicken the rhythm tone and cut it off to bring up the level with a more cutting tone).

      Like all the EHX pedals it's well built and very musical sounding...

      (1 of 1 customers found this review helpful)

       
      5.0

      Great pedal

      By Neverdweller

      from Tennessee

      See all my reviews

      Comments about Electro-Harmonix XO Knockout Attack Equalizer Guitar Effects Pedal:

      I have been using it for quite some time and as many have stated at first I was a little disappointed BUT after tweaking and playing with it a ton I realized this pedal is freaking amazing and can really change your tone, if your looking for a different kind of sound to add in with your other effects or just need some more... punch as it were, buy this pedal ;)

      (1 of 1 customers found this review helpful)

       
      5.0

      Like it says, Awesome for Bass

      By Action Jackson

      from OKLAHOMA

      Comments about Electro-Harmonix XO Knockout Attack Equalizer Guitar Effects Pedal:

      I went to my local music store looking for a sansamp bass driver, and they didn't have them. I ended up looking for other pedals, and just happened to try this. I was playing an American Deluxe Jazz Bass, and this thing made it sound 10x better than it did without it. I immediately bought it, took it home and toyed with it, then played a show with it that night. I got a lot of good comments about the sound I had with it, and my friend that played on my rig later said that he would be buying one immediately. This pedal allows you to cut through the guitar and drums in any situation. I would highly recommend this to any bass player out there.

      (1 of 1 customers found this review helpful)

       
      5.0

      Provides versatility of sound

      By Profdave

      from Kentucky

      See all my reviews

      Ask me a question

      Comments about Electro-Harmonix XO Knockout Attack Equalizer Guitar Effects Pedal:

      I use this pedal in a variety of ways, but mostly to make an inexpensive Dean Boca electric 12-String sound more like a Rickenbacker 12. It's very easy to use, and lets you adjust your sound with high-pass and low-pass filters. Electro Harmonix claims the pedal can change your sound from "Gibson to Strat to Telecaster, with innumerable shades in between." I've found this to be true. With the right tweaking, you can also get a bit of the Rickenbacker sound. Of course, nothing can replace the original sound, but this comes very close. This pedal is an inexpensive solution for expanding the tonal range of your guitar.

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