The NBA is curbing the ability of the highest-spending teams, such as the Golden State Warriors and the LA Clippers, to continue running up salary and luxury tax spending while still maintaining mechanisms to add talent to the roster. The NBA is implementing a second salary cap apron — $17.5 million over the tax line — and those teams will no longer have access to the taxpayer mid-level in free agency. Those changes will be eased into the salary cap over a period of years. Under these changes, Golden State’s Donte DiVincenzo, Milwaukee’s Joe Ingles, Boston’s Danilo Gallinari and former Clippers guard John Wall wouldn’t have been able to sign with those teams last summer.