Two amplifiers - these are the older style, larger and heavier than the new Class D but CLEAN audio, rated full power 20 - 20,000 Hz at <.05% THD. I used the 2X200W one for front speakers and the 2X100W for rear. They can each be run bridged for twice the power into one channel. Used for about a year and then stored in dry room. See photo for specs. If you can use them, please make me an offer and provide a local phone number for me to text or call as I can not reply by email.