diff --git a/src/bot/audioCaptureProcedure.ts b/src/bot/audioCaptureProcedure.ts
index 6ebb365..008be26 100644
--- a/src/bot/audioCaptureProcedure.ts
+++ b/src/bot/audioCaptureProcedure.ts
@@ -123,8 +123,8 @@ export class AudioCaptureProcedure {
             let skippedSilentChunks = 0;
             let callbackCount = 0;
             let totalNonZeroSamples = 0;
-            const minRmsThreshold = 0.0015;
-            const samplesPerChunk = nativeRate * 2;
+            const minRmsThreshold = 0.0003;
+            const samplesPerChunk = nativeRate * 4;
             const targetRate = 16000;
             // Pre-roll: keep last 500ms of discarded silent chunks so that
             // speech onsets at the tail of a silent window are preserved.