diff --git a/modem/modem.py b/modem/modem.py
index 38a79f56..cd7467ee 100644
--- a/modem/modem.py
+++ b/modem/modem.py
@@ -162,7 +162,7 @@ class RF:
                 callback=self.sd_output_audio_callback,
                 device=out_dev_index,
                 samplerate=self.AUDIO_SAMPLE_RATE,
-                blocksize=600,
+                blocksize=900,
             )
             self.sd_output_stream.start()