Reply To: Sound Lab ESL and power home › Forums › General Discussion › Sound Lab ESL and power › Reply To: Sound Lab ESL and power June 18, 2023 at 4:29 pm #1503 John VParticipant I turn off the bias supply to my U890’s after a listening session via an inline switch. Have been doing this for years. This reply was modified 3 months, 2 weeks ago by John V. Attachments:You must be logged in to view attached files.