What would be prohibited by the sixth amendment

The Sixth Amendment to the U. S. Constitution affords criminal defendants seven discrete personal liberties: (1) the right to a Speedy Trial; (2) the right to a public trial; (3) the right to an impartial jury; (4) the right to be informed of pending charges; (5) the right to confront and to cross-examine adverse witnesses; (6) the right to compel favorable witnesses to testify at trial through the subpoena power of the judiciary; and (7) the right to legal counsel. Ratified in 1791, the Sixth Amendment originally applied only to criminal actions brought by the federal government.

I'm pretty sure it prohibits any state from providing less protection for a right conferred by the 6th Amendment than is provided under the federal Constitution.