This was pulled from a home cinema setup. It works great! I have 2 available. They are in the exact same excellent condition. They have a couple very minor scuffs and they both work perfectly.  It has 4 zones, 6 inputs, and 2 expansion ports.  Here is a little more info from online:Proficient Audio Systems M4 4 Zone Audio Controller multiroom controller/amplifier provides 30 watts per channel of stereo sound for as many as four rooms and accommodates up to six source devices. There’s simply no denying the pleasures of a really great whole house sound system. Enter the new Proficient M4. With the features of a single zone system and the flexibility of a multi-zone setup, the Proficient M4 is a solution worthy of your closest look-see.But your love affair with the M4 won’t end there. Now you can enjoy heart-stopping performance in four rooms with access up to six sources. And if that’s not enough, it features expandability up to 16 zones and six sources, which pretty much guarantees you’re going to be hearing what you want – where you want it. Yes, the M4 has the ever-popular Party mode providing you with one-stop control for your whole house. And, yes, it also gives you the ultimate convenience of a doorbell and telephone paging mute, assuring you’ll never miss that next page or that next unexpected visitor.Fully programmable and expandable, high performance digital amplification plus world class Proficient reliability and quality. Just a few of the reasons to consider the new M4 Audio Controller.Specifications:Model Number - M4Four zone audio controllerSix source inputsPower - 30 watts x 8 channelsDoorbell & telephone paging muteAll digital amplificationProgrammable via Proficient Editor softwareDimensions (H x W x D) - 513/16" x 171/8" x 15½"Weight - 20 lbs