diff --git a/CHANGELOG.md b/CHANGELOG.md
index 21abadaee..c30bc3594 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,15 @@ All notable changes to **Pipecat** will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
+### Fixed
+
+- Added real-time throttling to the `BaseOutputTransport` when using audio mixer
+  to ensure audio frames (including silence) are emitted at the correct intervals. 
+  This prevents unnecessary CPU usage and avoids flooding the output with silent 
+  frames when no new audio is available.
+
 ## [0.0.66] - 2025-05-02
 
 ### Added
diff --git a/src/pipecat/transports/base_output.py b/src/pipecat/transports/base_output.py
index a5264f622..1ee5cf5bf 100644
--- a/src/pipecat/transports/base_output.py
+++ b/src/pipecat/transports/base_output.py
@@ -436,7 +436,7 @@ class BaseOutputTransport(FrameProcessor):
                 last_frame_time = 0
                 silence = b"\x00" * self._audio_chunk_size
                 # chunk duration in seconds
-                chunk_duration = ( 10 * self._params.audio_out_10ms_chunks ) / 1000.0
+                chunk_duration = (10 * self._params.audio_out_10ms_chunks) / 1000.0
                 next_frame_time = time.time()
                 while True:
                     try: