diff --git a/TNC/FilterCoefficients.hpp b/TNC/FilterCoefficients.hpp
index 8d16667..5711dfc 100644
--- a/TNC/FilterCoefficients.hpp
+++ b/TNC/FilterCoefficients.hpp
@@ -9,28 +9,6 @@
 
 namespace mobilinkd { namespace tnc { namespace filter {
 
-const TIirCoefficients<2> dB_3 = {
-    {0.148416305668, 0.148416305668},
-    {1.0, -0.703167388663}
-};
-
-const TIirCoefficients<2> dB0 = {{1.0, 1.0}, {1.0, 1.0}};
-
-const TIirCoefficients<2> dB3 = {
-    {0.821330488584, -0.821330488584},
-    {1.0, -0.642660977168}
-};
-
-const TIirCoefficients<3> dB6 = {
-    {0.704863714497, -1.40972742899, 0.704863714497},
-    {1.0, -1.3445352861, 0.474919571889}
-};
-
-const TIirCoefficients<4> dB9= {
-    {0.605034079053, -1.81510223716, 1.81510223716, -0.605034079053},
-    {1.0, -2.04985913806, 1.44420376126, -0.346209733102}
-};
-
 namespace fir {
 
 // 1200Hz = -12dB, 2200Hz = 0dB; 3653Hz cutoff, 4.93 gain; cosine.
@@ -341,65 +319,6 @@ const TFirCoefficients<9>* AfskFilters[] = {
   &dB12
 };
 
-
-#if 0
-
-const TFirCoefficients<9> dB_3 = {
-    {   0.0190268296698,
-        0.0720836132753,
-        0.131839958497,
-        0.178778602372,
-        0.196541992372,
-        0.178778602372,
-        0.131839958497,
-        0.0720836132753,
-        0.0190268296698,
-    },
-};
-
-const TFirCoefficients<9> dB3 = {
-    {
-        -0.0137747043237,
-        -0.0496069821386,
-        -0.0880620689921,
-        -0.11751320055,
-        0.869433181254,
-        -0.11751320055,
-        -0.0880620689921,
-        -0.0496069821386,
-        -0.0137747043237,
-    }
-};
-
-const TFirCoefficients<9> dB6 = {
-    {
-        -0.00808574330071,
-        -0.0502334418895,
-        -0.115447610972,
-        -0.175051834084,
-        0.796496156597,
-        -0.175051834084,
-        -0.115447610972,
-        -0.0502334418895,
-        -0.00808574330071,
-    }
-};
-
-const TFirCoefficients<9> dB9= {
-    {   -0.000653382869306,
-        -0.0386591907088,
-        -0.121362869,
-        -0.208082569133,
-        0.750548984054,
-        -0.208082569133,
-        -0.121362869,
-        -0.0386591907088,
-        -0.000653382869306,
-    }
-};
-#endif
-
-
 } // fir