Set of 8 Professional (Metal) Speaker spikes, Paid 120.00, sacrifice for 60.00 firm
this helps to isolate biofeedback to speakers, helps make a better sound from the accustic (speaker box) Picture shows 6, but I have 8 (4 for each speaker)
Spikes install at the base of the speaker (I mention this because 2 persons reply asking how to use a spike)