The phrase "are significant enough" is correct and usable in written English.
It can be used to indicate that something has a level of importance or impact that meets a certain threshold.
Example: "The results of the study are significant enough to warrant further investigation."
Alternatives: "are sufficiently important" or "are meaningful enough".
"The problems are significant enough to warrant a closer look," said the spokeswoman, Sharon Lee.
The physical and psychological consequences of unemployment are significant enough to affect family members.
"These are reductions that are significant enough to allow many women to avoid a hysterectomy," Dr. Eisinger said.
"I am not certain that those emissions are significant enough to offset other factor changing the climate," he said.
In some cases, these actions are significant enough to offset completely the outcome the government had hoped to achieve.
Seen from elsewhere, these may not look particularly bad, but in Germany they are significant enough to shrink any wider ambitions to lead the continent.
The commercial repercussions of this are significant enough to shut certain titles down for good and alter the ways that others go about their business in the future.
To be fair, some question whether the correlations are significant enough to justify considering media violence a substantial public health issue.
Cauldrons with bullhead attachments show the influence of Urartian craftsmanship, but the differences are significant enough to indicate an independent local school of bronze working.
It's amazing how little differences which you or I (I'm assuming you're not a world-class tennis player) wouldn't even notice are significant enough to actually cause injury to elite athletes.
Its lingering problems, including the questionable loyalties of the former rebels now in power and the competition between the Kremlin and the Chechen government for oil, are significant enough that the republic could slip into disorder again.
