InfoComm 2019: Extron Shows XPA Ultra Series Power Amplifiers, Including Compact 8-Channel VersionJune 19, 2019 | Home / June 19, 2019 rave-video / InfoComm 2019: Extron Shows XPA Ultra Series Power Amplifiers, Including Compact 8-Channel Version InfoComm 2019: Extron Shows XPA Ultra Series Power Amplifiers, Including Compact 8-Channel Version