I added sand. Very easy to do, available at hardware stores and garden centers in 40 lb bag. I did not compare before and after, but it's recommended by B&W and it seems obvious that it should help.
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Clearaudio Ovation with Tracer Dynavector KARAT 17DX Naim Uniti Core Schiit Yggdrasil McIntosh C22/MC275 Wilson TuneTots B&W DB3D Nordost QKore/QBase/Frey 2 Transparent Super IsoAcoustics GAIA II
Stax SR-009S with SRM-700T
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