Boss Katana-100 Combo Guitar Amp (KTN-100) (Discontinued / Superseded)


91 out of 100. Incorporating 425+ ratings and reviews.

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Boss Katana-100 Combo Guitar Amp (KTN-100)
Boss Katana-100 Combo Guitar Amp (KTN-100)

Meta Analysis Overview

Our rating of 91/100 is based on analysis of 425+ sources comprised of online reviews and discussions. Under the Pros and Cons headings below you'll find a condensed analysis of what those owners and users have been saying. Feel free to ask questions or add your thoughts in the comments section.

The Boss Katana 100 KTN-100 is a 100 Watt combo amplifier with built-in DSP (digital sound processing) and power attenuation.

Its coolest feature is its power attenuator, which lets you lower the power rating to half (50W) and can even go as low as 0.5W. This feature allows you to drive the amp harder at lower volumes, making it ideal for practice and recording.

This is in conjunction the amp's multiple voicings, which includes standard Clean tone and various shades of overdrive - Crunch, Lead and Brown (high-gain). There's also a nifty acoustic amp mode that is meant to complement acoustic-electric guitars.

As expected, this amp comes with digital recreations of Boss' popular pedals, with a total of 55 currently available. Note that you can only load up to 15 effects on to the amp and you can only use up to 3 of them simultaneously.


  • Power: 100W (With Built-in Power Attenuation)
  • Speaker: 1 x 12"
  • Amp Modeling: 5 Amp "Characters"
  • Effects: 55 (Up to 3 Simultaneously)
  • Input: 1 x 1/4", 1 x 1/8" (Aux in)
  • Outputs: 1 x 1/4" (Line Out), 1 x 1/4" (Headphones/Rec out)
  • Weight: 32.69 lbs.

With its sharp looks and killer tones, this amp stays true to its katana name, as reflected by its continued high ratings. It gets the most commendations for its tone - to be more specific, its clean and slightly overdriven voicings. And with some tweaking, there are many who have gotten reasonably good sounding high gain tones. Even experts like Art Thompson of Guitar Player Magazine shared their satisfaction with the amp's sound, saying: "There’s good touch responsiveness on the higher gain tones, and these 100-watters are definitely capable of holding their own in a band." Coming from Boss, many are also happy with the amps built-in effects, while those who already own pedals report that it works well with stompboxes and guitar processors. The amp's built-in attenuation also adds to the overall value of the amp, making it viable for use in smaller venues and even for low volume practice.

There are some who find the amp a bit lacking in terms of amp models. The limit of up to 3 effects simultaneously also got a few users scratching their heads, especially when considering that Boss can easily pack this amp with more. But this maybe a design decision, a nod to the simple yet effective design of the Japanese katana blade.

This model has been superseded by the MK II version so if you'd like to see which amps we currently recommend then take a look at our guide to The Best Guitar Amps Under $500.