This is an in-wall (built-in) non powered subwoofer used by me some years back in a home theater system. This system was put together by me prior to the advent of AVR units. So what I did was obtain a processor from the TV provider that offered 5.1 surround sound. I used independent stereo power amps to drive all channels including the one connected to this subwoofer. Note the spec sheet attached from the company. I am the original purchaser/owner of this speaker. The unit never was installed or built into a wall. It was placed behind an equipment cabinet and worked perfectly. The unit has a grill that attaches to the front of the speaker. As I moved to a new home this original system including the subwoofer was not compatible with the new environment so all was placed in storage with the intent of using it at a later time. It is now time to move again, so I have put everything up for sale with the subwoofer being the last piece to be sold. The reason for the 7/10 rating as to condition is the age of the unit. This unit sold new for $450.00 The unit is in perfect working condition. I will pay freight/shipping in continental US if unit is sold at asking price.