professional wrestling | professional | professional golfer | Professional wrestling | Atlantic League of Professional Baseball | Professional Golfers' Association of America | Nippon Professional Baseball | Professional Footballers' Association | professional wrestling promotion | Society of Professional Journalists | Professional wrestling promotion | All-American Girls Professional Baseball League | Professional Arena Soccer League | Manager (professional wrestling) | Central Professional Hockey League | Women's Professional Soccer | Professional Rodeo Cowboys Association | Professional golfer | Professional diving | Professional | List of Nippon Professional Baseball players | Championship (professional wrestling) | Professional sports | professional sports | National Board for Professional Teaching Standards | National Association of Professional Base Ball Players | JBL | Canadian American Association of Professional Baseball | The BroMans (professional wrestling) | Professional Golfers Association |
1977: Forsythe added two way compact systems and vented subwoofer systems with a unique interchangeable tube venting system such the enclosure could be field re-configured for use with various drivers from JBL Professional, Gauss Loudspeakers, Altec and EV.