My name is Matt. I have 2 Crown I-Tech 4000 amplifiers for sale for $1,400 each that I was using to power 4 ElectroVoice Passive Subwoofers (which are also for sale). They work perfect and can be configured with their very powerful on-board DSP and by free download of Harmon's Blu software. These were being used in my home theater and were previously used in an auditorium install. I'm willing to negotiate on price.

Here is a link to the manufacturer's page: