KatCab V2 External Speaker Mod

"Game Changer for My Katana"
Installed in minutes and now I can run my Katana through a 2x12 cab — sounds massive! Super clean mod and works exactly as promised."

⭐⭐⭐⭐⭐ 
Bob P. – ✅ Verified Customer

Unlock the Full Power of Your Katana – Connect to Any Cab 🎛️

Love your Katana combo amp but wish you could hook it up to an external cab? You’re not alone. Boss designed the Katana with incredible tone and flexibility — but left out one key feature: external speaker support. That’s where the External Speaker Mod V2 comes in. This simple, reliable upgrade gives your Katana combo the ability to run both its internal speaker and external cabinets safely — no soldering or guesswork required.

Whether you want to connect a 2x12 for fuller tone, run a 4x12 stack on stage, or just experiment with different speaker flavors, this mod gives you the freedom your amp deserves. Compatible with MKI, MKII & Gen3, it’s plug-and-play, discreet, and built to last. Finally, your tone is no longer boxed in.

🔧 Why Upgrade with the External Speaker Mod?

🔌 Dual Output Functionality
Play through the internal speaker, an external cab, or both at the same time — total flexibility with zero tone loss.

🎛️ Safe & Reliable Design
Designed specifically for Katana combos, this mod protects your amp’s power section and wiring — no risk of overload or damage.

🧰 Easy, No-Solder Installation
Installs in minutes using basic tools — no need to crack open your amp or void your warranty.

🎚️ High-Quality Components
Built with premium parts for a clean signal path and long-lasting performance in both rehearsal and live settings.

🎵 Compatible with MKI, MKII & Gen3
Works with all Katana 50/100 MKI, MKII, and Gen3 combo amps, so you can upgrade no matter your model.

🧱 Discreet, Pro Look
Low-profile mounting plate and jack blend right in with your amp’s aesthetics — looks like it came stock.

🔊 Expand Your Sound
Run your Katana through a bigger cab for deeper lows, wider projection, or different speaker voicings — it’s your tone, your way.

Here is a list of combo amps that work with the V2 version, but it will also work with other combo amps if you want more than 1 speaker output.

 • Fender - Champion 20, Champion 40, Champion 100, Champion 50XL, Champion 100XL
 • Fender - Mustang I, Mustang II
 • Fender - Mustang GT40, Mustang GT100, Mustang GT200, Mustang GTX50, Mustang GTX100
 • Fender - Tone Master Twin Reverb, Tone Master Deluxe Reverb
 • Fender - Hot Rod Pro Junior IV, Blues Junior IV, Blues Deluxe Reissue, Blues Junior Lacquered Tweed. 
 • Line 6 - Catalyst 60, Catalyst 100, Catalyst 200
 • Line 6 - Spider III 15, Spider III 30 & Spider III HD75
 • Line 6 - Spider II 15, Spider II 30 & Spider II HD75

🎤 We’ve Been There Too…

You’re at rehearsal, trying to cut through the mix. You love your Katana’s tone, but the single 12” speaker just isn’t giving you the presence or thump you need. You think, “If I could just run this through my 2x12 cab, I’d be golden.” But Boss didn’t make it that easy — until now.

That’s exactly why we offer the External Speaker Mod V2. It’s made by players, for players who want more control over their sound without risking their gear. If you’ve ever felt limited by your combo amp, this is the simple, smart mod that takes your Katana to the next level.