I have the VR-4jr,I previosly owned the VR-2.The 2 was much more forgiving and sounded good with every amp I tried(Sonic Frontiers SFM 75 and 160 Monos,Odyssey Stratos Extreme,Hafler XL-600,VTL Stereo 75,and more). The 4jr are fussier and seem to demand high power solid state amps for a deep,tight,and musical bass presentation.I'm currently using a 300 wpc prototype amp manufactured by Consonance.It's the best I have tried.Bi amping is also something I'm considerng.The best Von Schweikert sound I've heard is the Db-99 speaker with Consonance Cyber 211 Monos.
Larry
Larry