The present invention relates to systems andor methods that generate playlist for a library or collection of media items via selecting a plurality of seed items, at least one of which is an undesirable seed item. The apparatus comprises a valve element and a lock element. A proximal handle member is disposed to the proximal portion of the handle member and a distal handle member is disposed to the distal portion of the handle member. A motor mount includes spaced apart locking elements that are configured to engage with respective gearcase locking elements. The main power of the powered subwoofer is provided via a wall outlet or suitable power supply that may adequately supply the necessary power.