diff --git a/app/src/main/rs/stft.rsh b/app/src/main/rs/stft.rsh
index 92508aa..2a97fe0 100644
--- a/app/src/main/rs/stft.rsh
+++ b/app/src/main/rs/stft.rsh
@@ -56,8 +56,12 @@ static void spectrum_analyzer(float amplitude)
                 spectrum_buffer[spectrum_width * j + i] = spectrum_buffer[spectrum_width * (j-1) + i];
         for (int i = 0; i < spectrum_width; ++i) {
             int b = (i * (radix2_N / 2)) / spectrum_width;
+#if 0
             float dB = 20.0f * log10(cabs(output[b]));
             float v = min(1.0f, max(0.0f, (60.0f + dB) / 60.0f));
+#else
+            float v = min(1.0f, max(0.0f, pown(cabs(output[b]), 2)));
+#endif
             spectrum_buffer[i] = rainbow(v);
         }
     }