Reply To: Experience with amplifiers and Sound Lab speakers home › Forums › General Discussion › Experience with amplifiers and Sound Lab speakers › Reply To: Experience with amplifiers and Sound Lab speakers November 7, 2021 at 5:46 pm #1011 John VParticipant @chungjh The factory does offer a bi-amp option. Your current backplates can be retrofitted if desired. I would email Roger for instructions. If your a bit handy it’s actually fairly easy to do yourself. I did this myself for my U890’s John