diff --git a/wafer_layouts/cross_pattern_idt.scad b/wafer_layouts/cross_pattern_idt.scad
index e3f684b..a4fdf36 100644
--- a/wafer_layouts/cross_pattern_idt.scad
+++ b/wafer_layouts/cross_pattern_idt.scad
@@ -36,7 +36,7 @@ substrate = "LINBO";
 c = 3992.0;
 // si
 // c = 3159.0;
-freq = 50.0e6;
+freq = 25.0e6;
 
 // $fs = (c/freq);