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

m-db Details Discussions Posts This discussion Message User 1,045 posts 09-15-2018 at 02:28am Copy Comment URL Report Comment Edit Delete Velodyne Plus subwoofers offer line level (RCA) nominal impedance 47K. Balanced (XLR) nominal impedance 10K. Speaker level inputs. Refer to their User's Manual for detailed connectivity options. http://velodyneacoustics.com/pdf/digitaldriveplus/DD+Manual.pdf