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How to add an external speaker to your katana 100 into an external speaker (works on any combo amp) - YouTube
Boss Katana Head MkII 100-watt Guitar Amp Head | Sweetwater
BOSS Katana - 100 mKII Combo Guitar Amplifier, Stage-Ready 100-watt Combo Amp with a Custom 12 Inch Speaker: Buy Online at Best Price in UAE - Amazon.ae
Boss Katana MKI & MKII Combo Amp External Speaker Mod | eBay