diff --git a/gui/src/assets/waterfall/spectrum.js b/gui/src/assets/waterfall/spectrum.js
index fb93bd61..1e75e548 100644
--- a/gui/src/assets/waterfall/spectrum.js
+++ b/gui/src/assets/waterfall/spectrum.js
@@ -454,7 +454,7 @@ export function Spectrum(id, options) {
   this.centerHz = options && options.centerHz ? options.centerHz : 1500;
   this.spanHz = options && options.spanHz ? options.spanHz : 0;
   this.wf_size = options && options.wf_size ? options.wf_size : 0;
-  this.wf_rows = options && options.wf_rows ? options.wf_rows : 1024;
+  this.wf_rows = options && options.wf_rows ? options.wf_rows : 512;
   this.spectrumPercent =
     options && options.spectrumPercent ? options.spectrumPercent : 0;
   this.spectrumPercentStep =
diff --git a/modem/audio.py b/modem/audio.py
index 24ba8156..66bf06ad 100644
--- a/modem/audio.py
+++ b/modem/audio.py
@@ -225,6 +225,8 @@ def calculate_fft(data, fft_queue, states) -> None:
     global RMS_COUNTER, CHANNEL_BUSY_DELAY
 
     try:
+        data = bytearray()
+
         fftarray = np.fft.rfft(data)
 
         # Set value 0 to 1 to avoid division by zero
@@ -321,6 +323,8 @@ def calculate_fft(data, fft_queue, states) -> None:
             # erase queue if greater than 3
         if fft_queue.qsize() >= 1:
             fft_queue = queue.Queue()
-        fft_queue.put(dfftlist[:315]) # 315 --> bandwidth 3200
+        #fft_queue.put(dfftlist[:315]) # 315 --> bandwidth 3200
+        fft_queue.put(dfftlist) # 315 --> bandwidth 3200
+
     except Exception as err:
         print(f"[MDM] calculate_fft: Exception: {err}")
diff --git a/modem/event_manager.py b/modem/event_manager.py
index 9ad54e1e..f4705cae 100644
--- a/modem/event_manager.py
+++ b/modem/event_manager.py
@@ -11,7 +11,7 @@ class EventManager:
 
     def broadcast(self, data):
         for q in self.queues:
-            #self.logger.debug(f"Event: ", ev=data)
+            self.logger.debug(f"Event: ", ev=data)
             if q.qsize() > 10:
                 q.queue.clear()
             q.put(data)
diff --git a/modem/modem.py b/modem/modem.py
index 372449e7..1dde9746 100644
--- a/modem/modem.py
+++ b/modem/modem.py
@@ -152,7 +152,7 @@ class RF:
                 callback=self.sd_input_audio_callback,
                 device=in_dev_index,
                 samplerate=self.AUDIO_SAMPLE_RATE,
-                blocksize=1200,
+                blocksize=4800,
             )
             self.sd_input_stream.start()
 
@@ -162,7 +162,7 @@ class RF:
                 callback=self.sd_output_audio_callback,
                 device=out_dev_index,
                 samplerate=self.AUDIO_SAMPLE_RATE,
-                blocksize=256,
+                blocksize=512,
             )
             self.sd_output_stream.start()
 
@@ -259,7 +259,7 @@ class RF:
             self.tci_module.wait_until_transmitted(audio_48k)
         else:
             # slice audio data to needed blocklength
-            block_size = 256
+            block_size = 512
             pad_length = -len(audio_48k) % block_size
             padded_data = np.pad(audio_48k, (0, pad_length), mode='constant')
             sliced_audio_data = padded_data.reshape(-1, block_size)