J&M speakers are the most powerful speakers you can buy for your bike and they perform extremely well when used with a medium-high powered accessory amplifier. Speakers feature lightweight waterproof woven-fiber cones with super-rigid metal basket and a high-density lite-weight Neodymium magnet structure, specially coated to maintain flux-strength integrity even at extreme operating temperatures.; 2 ohms impedance 300 watts maximum input (200w RMS - 91db sensitivity) Lightweight waterproof woven-fiber cones with super-rigid metal basket and a high-density lite-weight Neodymium magnet structure High efficiency vented voice coils for improved cooling when operating at high volumes for extended periods High quality adapter rings and bracket hardware are included for mounting Mounting hole pattern and spade electrical connections are the same as factory specification 100% plug and play; NOTE: Not for direct connection to the RSI factory radio system.