This is an amazing surround microphone system. Originally an SPS422 and updated to the SPS422B. It’s in great shape and it includes the main hardware interface, microphone, shockmount and two spools of cabling. One Spool includes two 75ft length of cabling and the other spool includes 300ft. The total cable alone New would be $2600.00! Soundfield is now owned by Rode Microphones. Grab the Free Ambeo software from Sennheiser’s website and then use the Plugin to mix in multi output channels. The system has been tested and works great. However, the pots do scratch a bit when moving them. But, once they are in a position, all is well. At this price, if you so desired, you could just send it to Soundfield and have them do a little reconditioning.