Which subwoofers have at least a 20k input impedance as required for ARC preamp

The long title is the question. Very hard to find sub specs. Thanks for any information.

442509-11-2018 11:34pm

atmasphere Details Discussions Posts This discussion Message User 7,068 posts 09-13-2018 at 07:22pm Copy Comment URL Report Comment Edit Delete Is replacing the preamp a possibility? There are other balanced tube preamps that have no problems driving loads like that.