Boss KTN-25 Katana 25

The Boss Katana-25 brings the iconic Katana sound to a compact guitar amplifier for home use. With 25 watts of power, a specially designed 8-inch speaker, six amp models, and over 60 Boss effects, you have everything you need to explore a variety of guitar styles. From warm clean tones and bluesy crunch to heavy rock and high-gain sounds: the Katana-25 delivers the tone and response you’ve come to expect from the Katana series.

Thanks to Boss Tube Logic technology, the amplifier responds to your touch and playing style, much like a traditional tube amplifier. The built-in Bluetooth functionality lets you play music from your smartphone or tablet while playing along on your guitar. Through the Boss Tone Studio app, you get access to extensive tone settings, additional effects, and practice features.

With its intuitive controls, built-in tuner, headphone output, and USB-C port for recording, the Boss Katana-25 is suitable for both beginner guitarists and experienced players looking for a compact practice amplifier.

The Katana sound in a compact format
The Boss Katana-25 combines a responsive 25-watt analog power amp with a specially developed 8-inch speaker. Thanks to the Tube Logic design philosophy, the preamp, power amp, and speaker work together to replicate the dynamic playing feel of a tube amp. You’ll notice this while playing: subtle changes in your touch are audibly reflected in the tone. Softly played notes remain clear, while a more forceful touch produces more character and distortion. The sturdy open-back cabinet is tuned to the speaker and delivers a full sound with good dispersion. As a result, the Katana-25 sounds bigger than its compact dimensions would suggest.

Six amp profiles for different music styles
The Boss Katana-25 features six distinct amp profiles, including variations, allowing you to create a wide range of guitar tones—from sparkling clean tones for pop, funk, and country to blues, classic rock, and modern metal. The amplifier also offers plenty of options for fans of heavy overdrive. The signature Brown sound delivers the saturated high-gain tone for which the Katana series is known. In addition, there’s a separate amp character for electro-acoustic instruments. This allows you to use the Katana-25 to amplify an electro-acoustic guitar as well. With the controls for Gain, Volume, and the three-band equalizer, you can adjust the tone directly from the control panel. This allows you to experiment with different sounds without external equipment.

Over 60 Boss Effects
In additionto the various amp models, the Katana-25 features an extensive selection ofover 60 Boss effects. This allows you to enhance your guitar sound with modulation, delay, reverb, and other sound effects. Up to five effects can be used simultaneously, allowing you to create complete effect combinations. The full selection of effects and their settings is accessible via the Boss Tone Studio app. For example, you can combine a subtle chorus with delay and reverb to create spacious clean tones, or further shape a distorted rock sound with additional effects. With the built-in tap-tempo function, you can set the timing of delay effects by tapping the desired tempo.

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30 memory slots for your favorite sounds
The Tone Setting section of the Boss Katana-25 makes it easy to recall and adjust various amp settings. The amp comes with 20 pre-programmed sounds that are ready to play right out of the box. These presets serve as a starting point for a wide range of musical styles and showcase what the various amp characters and effects have to offer. In addition, there are 10 empty memory slots available for storing your own sounds. For example, you can save separate settings for clean guitar, blues, rhythm parts, and solos. The built-in LCD screen and the selection knob provide access to the various memory slots and settings. Key amp and effect parameters can also be adjusted directly from the control panel. In addition, the Tone Setting section features a built-in tuner, so you don’t need a separate one.

Power Control for low-volume practice
A key feature of the Boss Katana-25 is the switchable Power Control function. This function lets you choose between the full 25-watt output and a reduced output of 0.5 watts. At the 25-watt setting, you get the full power and dynamics of the amplifier. If you switch to 0.5 watts, you can play at a lower volume while still retaining the character of an amp cranked up to full volume. This makes the Katana-25 ideal for use in the living room, bedroom, or home studio. You can experiment with overdriven sounds without needing high volume.

Bluetooth for Music and Wireless Control
The Boss Katana-25 comes standard with Bluetooth for wirelessly connecting a smartphone, tablet, or other compatible device. With Bluetooth audio streaming, you can play music through the built-in speaker while playing your guitar at the same time. This makes it easy to play along with your favorite songs, backing tracks, or practice material. In addition, the amplifier supports Bluetooth MIDI for communication with the Boss Tone Studio app. This allows you to adjust amplifier and effect settings without using a cable between your mobile device and the amplifier. The combination of audio streaming and wireless control makes the Katana-25 a complete practice solution for everyday use.

Boss Tone Studio and Boss Tone Exchange
The accompanying Boss Tone Studio app gives you access to the Katana-25’s extensive capabilities. Through this app, you can adjust amplifier parameters, select effects, change effect settings, and create your own sounds. The customized settings can then be saved to the amplifier’s Tone Setting memory slots. In addition, the app provides access to Boss Tone Exchange, the platform where guitarists share sounds and settings with one another. This allows you to discover new sounds and try out settings from other users. The app also features a Session function that lets you view and play YouTube videos within the app. This is useful for practicing with songs, backing tracks, and online guitar lessons. While playing a video, you can even program automatic Tone Setting changes. This allows the amplifier to switch to a different sound at preset moments—for example, when a song transitions from a verse to a guitar solo.

Recording via USB-C and Practicing with Headphones
The Boss Katana-25 features a USB-C port that lets you connect the amplifier directly to a computer or compatible mobile device. Thanks to its class-compliant USB audio functionality, you can digitally record your guitar playing without needing a separate audio interface. This makes the amplifier ideal for guitarists who want to capture ideas at home, record demos, or work with recording software. For practicing without disturbing others, there is a separate PHONES/REC OUT jack. You can plug headphones into this jack to play in silence. This jack can also be used as a recording output for connecting external recording equipment.

External Control with Footswitches and Expression Pedals
Want to switch between different sounds while playing without touching the controls on the amplifier? Then you can connect an optional Boss footswitch. The Katana-25 supports, among others, the Boss FS-5U, FS-6, and FS-7. This allows you to control Tone Settings while you continue playing. In addition, the amplifier supports various expression pedals, including the Boss EV-30, FV-500H, FV-500L, and Roland EV-5. For wireless control, you can pair the Katana-25 with the Boss FS-1-WL wireless footswitch or the Boss EV-1-WL wireless expression pedal. These allow you to select sounds and adjust parameters, among other things. These accessories are sold separately.

Compact, lightweight, and easy to carry
Measuring just 36 x 18 x 31 cm and weighing 4.8 kg, the Boss Katana-25 takes up very little space. Its compact design fits easily in a bedroom, practice room, or home studio. Thanks to the built-in handle, you can easily take the amplifier with you to a guitar lesson or any other practice location. The combination of the 8-inch speaker, the open-back design, and the responsive analog amplifier circuit ensures that the Katana-25 delivers a full-bodied guitar sound despite its compact size.

Boss Katana-25 features:

• Compact 25-watt guitar combo for home use and practice
• Boss Tube Logic technology for the tone and response of a tube amplifier
• reactive analog power amp with 25 watts of output power
• 1x specially designed 8-inch speaker
• Open-back cabinet for a full and spacious sound
• Six amp tones with additional variations
• Amplifier preset for electro-acoustic guitars
• Over 60 Boss effects available via Boss Tone Studio
• up to five effects can be used simultaneously
• 20 preset sounds
• 10 free memory slots for custom sounds
• 30 memory slots total
• Built-in backlit graphic LCD display with 160 x 80 pixels
• Controls for gain, volume, bass, middle, and treble
• Tone Setting section with selection knob and effect controls
• Tap-tempo function for delay effects
• Built-in chromatic tuner
• Power Control with a choice of 25 watts and 0.5 watts
• Built-in Bluetooth for audio streaming and wireless MIDI communication
• Support for Bluetooth A2DP and GATT (MIDI over Bluetooth Low Energy)
• Compatible with Boss Tone Studio for advanced sound editing
• Access to shared sounds via Boss Tone Exchange
• Session function for practicing with YouTube videos
• Allows for automatic Tone Setting changes during video sessions
• USB-C port with class-compliant USB audio functionality
• Direct digital recording to a computer or compatible mobile device
• PHONES/REC OUT jack for headphones and recording
• Connection for optional footswitch or expression pedal
• Support for Boss FS-5U, FS-6, and FS-7 footswitches
• Support for the Boss FS-1-WL wireless footswitch
• Support for the Boss EV-1-WL wireless expression pedal
• Support for Boss EV-30, FV-500H, FV-500L, and Roland EV-5
• Power consumption: 25 watts
• guitar input: 6.35 mm jack
• Footswitch/expression pedal input: 6.35 mm TRS jack
• Headphone/recording output: 3.5 mm stereo mini-jack
• USB port: USB-C
• Dimensions (W x D x H): 36 x 18 x 31 cm
• Weight: 4.8 kg

In the box:

• Boss Katana-25 guitar amplifier
• power cord
• "Read Me First" documentation