How much water pressure do these sprinklers need?

Pressure is the single most common complaint in community threads. Reviewers repeatedly note that both Melnor and Orbit units underperform their advertised coverage at low household pressure — one r/lawncare user reported a Melnor MiniMax covering roughly 700 sq ft instead of 4,000. Melnor recommends 20–80 PSI, and impact sprinklers in particular were flagged for not handling low pressure gracefully.