Hi-Fi Separates
Boss Audio 4000W Armor Monoblock Class D 1 Channel Stable Amplifier with Remote Subwoofer Level Control
4-Channel MOSFET Bridgeable Power Amplifier Remote Subwoofer Level Control Included 800W x 2 Max Bridged Power
https://www.bizrate.co.uk/hifiseparates/boss-audio-4000w-armor-monoblock-oid6611042683.html