a glazing panel and hollow glazing panel , the hollow glazing panel including a first pane , a second pane held in spaced - apart , face - to - face relationship with the first pane , and a plurality of localized damping members positioned between the first and second panes , adherent thereto , and distributed therebetween over the area of the opposing faces thereof , wherein the first pane comprises a pair of vitreous sheets and an intervening layer of polymeric material separating the sheets of the pair and to which the sheets adhere , wherein the first pane has a shape , an area , and a total mass of vitreous material , and may be compared to a notional monolithic vitreous sheets having a coincidence frequency and a critical frequency of coincidence , wherein the first pane has a coincidence frequency and at least one critical frequency of coincidence , and wherein the intervening layer has viscoelastic properties such that the lowest critical frequency of coincidence of the first pane is greater than the critical frequency of coincidence of a notional monolithic vitreous sheet having the same shape and area as the first pane and having a mass equal to the total mass of vitreous material in the first pane .