diff --git a/compact_sets.py b/compact_sets.py
index 7c258a5..3aabbbb 100644
--- a/compact_sets.py
+++ b/compact_sets.py
@@ -540,11 +540,20 @@ class HarmonicSpace:
                     cents = abs(src_pitch.to_cents() - dst_pitch.to_cents())
                     cent_diffs.append(cents)
 
-                # Check voice_crossing: True if any voice moves to different position
-                num_voices = len(c1.pitches)
-                voice_crossing = not all(
-                    movements.get(i, i) == i for i in range(num_voices)
-                )
+                # Check voice_crossing: compare pitch ordering before/after
+                # Voice crossing = True if ordering changes (e.g., bass below tenor -> tenor below bass)
+                source = list(c1.pitches)
+                ordered_source = sorted(source, key=lambda p: p.to_fraction())
+                source_order = [ordered_source.index(p) for p in source]
+
+                # Destination pitches: transpose back to get sounding pitches
+                destination = [
+                    c2_transposed.pitches[movements[p]] for p in range(len(source))
+                ]
+                ordered_destination = sorted(destination, key=lambda p: p.to_fraction())
+                destination_order = [ordered_destination.index(p) for p in destination]
+
+                voice_crossing = source_order != destination_order
 
                 # Check is_directly_tunable: changing pitches are adjacent to staying pitch
                 is_directly_tunable = self._is_directly_tunable(