diff --git a/pykirdy/driver/kirdy.py b/pykirdy/driver/kirdy.py
index cb7d653..005424c 100644
--- a/pykirdy/driver/kirdy.py
+++ b/pykirdy/driver/kirdy.py
@@ -140,8 +140,10 @@ class FilterConfig:
             return "Sinc3"
 
     class Sinc3WithFineODR():
+        upper_limit = 31250
+        lower_limit = 1.907465
         def __init__(self, rate):
-            assert rate >= 1.907465 and rate <= 31250
+            assert rate >= self.lower_limit and rate <= self.upper_limit
             self.rate = float(rate)
 
         def _odr_type(self):