diff --git a/openwfs/algorithms/dual_reference.py b/openwfs/algorithms/dual_reference.py
index 8ac2703..3fd0283 100644
--- a/openwfs/algorithms/dual_reference.py
+++ b/openwfs/algorithms/dual_reference.py
@@ -131,7 +131,7 @@ def amplitude(self, value):
                 "The amplitude and group mask must all have the same shape."
             )
 
-        self._amplitude = value.astype(np.float32)
+        self._amplitude = value
 
 
     @property