diff --git a/audio/sinc.c b/audio/sinc.c
index 45550cf50d..b04b77a4ea 100644
--- a/audio/sinc.c
+++ b/audio/sinc.c
@@ -45,8 +45,9 @@
 #define PHASES_WRAP (1 << (PHASE_BITS + SUBPHASE_BITS))
 #define FRAMES_SHIFT (PHASE_BITS + SUBPHASE_BITS)
 
-#define SIDELOBES 16
+#define SIDELOBES 32
 #define TAPS (SIDELOBES * 2)
+#define CUTOFF 0.9
 
 #define PHASE_INDEX 0
 #define DELTA_INDEX 1
@@ -94,7 +95,7 @@ static void init_sinc_table(ssnes_resampler_t *resamp)
       {
          double p = (double)i / PHASES;
          double sinc_phase = M_PI * (p + (SIDELOBES - 1 - j));
-         resamp->phase_table[i][PHASE_INDEX][j] = sinc(sinc_phase) *
+         resamp->phase_table[i][PHASE_INDEX][j] = CUTOFF * sinc(CUTOFF * sinc_phase) *
             lanzcos(sinc_phase / SIDELOBES);
       }
    }
@@ -114,7 +115,7 @@ static void init_sinc_table(ssnes_resampler_t *resamp)
    {
       double p = 1.0;
       double sinc_phase = M_PI * (p + (SIDELOBES - 1 - j));
-      double phase = sinc(sinc_phase) * lanzcos(sinc_phase / SIDELOBES);
+      double phase = CUTOFF * sinc(CUTOFF * sinc_phase) * lanzcos(sinc_phase / SIDELOBES);
 
       float result = (phase - resamp->phase_table[PHASES - 1][PHASE_INDEX][j]) / SUBPHASES;
       resamp->phase_table[PHASES - 1][DELTA_INDEX][j] = result;
diff --git a/audio/test/snr.c b/audio/test/snr.c
index f7602baa5f..3d96375ccd 100644
--- a/audio/test/snr.c
+++ b/audio/test/snr.c
@@ -75,6 +75,8 @@ struct snr_result
    double phase;
 };
 
+// This doesn't yet take account for slight phase distortions,
+// so reported SNR is lower than reality.
 static void calculate_snr(struct snr_result *res,
       double omega,
       float *orig, const float *resamp, size_t samples)