diff --git a/htdocs/openwebrx.js b/htdocs/openwebrx.js
index 05fdef9..f884263 100644
--- a/htdocs/openwebrx.js
+++ b/htdocs/openwebrx.js
@@ -736,7 +736,9 @@ function on_ws_recv(evt) {
                         if ('max_clients' in config)
                             $('#openwebrx-bar-clients').progressbar().setMaxClients(config['max_clients']);
 
-                        waterfall_init();
+                        if (typeof(bandwidth) != 'undefined')
+                            waterfall_init();
+
                         var demodulatorPanel = $('#openwebrx-panel-receiver').demodulatorPanel();
                         demodulatorPanel.setCenterFrequency(center_freq);
                         demodulatorPanel.setInitialParams(initial_demodulator_params);
@@ -744,13 +746,14 @@ function on_ws_recv(evt) {
                             demodulatorPanel.setSquelchMargin(config['squelch_auto_margin']);
                         bookmarks.loadLocalBookmarks();
 
-                        waterfall_clear();
-
                         if ('sdr_id' in config && 'profile_id' in config) {
                             currentprofile = config['sdr_id'] + '|' + config['profile_id'];
                             $('#openwebrx-sdr-profiles-listbox').val(currentprofile);
                         }
 
+                        if (typeof(bandwidth) != 'undefined')
+                            waterfall_clear();
+
                         if ('frequency_display_precision' in config)
                             $('#openwebrx-panel-receiver').demodulatorPanel().setFrequencyPrecision(config['frequency_display_precision']);
 
diff --git a/owrx/connection.py b/owrx/connection.py
index c83a1c0..73e1f6d 100644
--- a/owrx/connection.py
+++ b/owrx/connection.py
@@ -12,6 +12,7 @@ from owrx.bookmarks import Bookmarks
 from owrx.map import Map
 from owrx.property import PropertyStack
 from owrx.modes import Modes, DigitalMode
+from owrx.config import Config
 from queue import Queue, Full, Empty
 from js8py import Js8Frame
 from abc import ABC, ABCMeta, abstractmethod
@@ -108,22 +109,26 @@ class OpenWebRxClient(Client, metaclass=ABCMeta):
 
 
 class OpenWebRxReceiverClient(OpenWebRxClient, SdrSourceEventClient):
-    config_keys = [
-        "waterfall_colors",
+    sdr_config_keys = [
+        "waterfall_min_level",
         "waterfall_min_level",
         "waterfall_max_level",
-        "waterfall_auto_level_margin",
         "samp_rate",
-        "fft_size",
-        "audio_compression",
-        "fft_compression",
-        "max_clients",
         "start_mod",
         "start_freq",
         "center_freq",
         "initial_squelch_level",
         "profile_id",
         "squelch_auto_margin",
+    ]
+
+    global_config_keys = [
+        "waterfall_colors",
+        "waterfall_auto_level_margin",
+        "fft_size",
+        "audio_compression",
+        "fft_compression",
+        "max_clients",
         "frequency_display_precision",
     ]
 
@@ -132,7 +137,7 @@ class OpenWebRxReceiverClient(OpenWebRxClient, SdrSourceEventClient):
 
         self.dsp = None
         self.sdr = None
-        self.configSubs = []
+        self.sdrConfigSubs = []
         self.connectionProperties = {}
 
         try:
@@ -142,6 +147,10 @@ class OpenWebRxReceiverClient(OpenWebRxClient, SdrSourceEventClient):
             self.close()
             raise
 
+        globalConfig = Config.get().filter(*OpenWebRxReceiverClient.global_config_keys)
+        self.globalConfigSub = globalConfig.wire(self.write_config)
+        self.write_config(globalConfig.__dict__())
+
         self.setSdr()
 
         features = FeatureDetector().feature_availability()
@@ -154,6 +163,10 @@ class OpenWebRxReceiverClient(OpenWebRxClient, SdrSourceEventClient):
 
         CpuUsageThread.getSharedInstance().add_client(self)
 
+    def __del__(self):
+        if hasattr(self, "globalConfigSub"):
+            self.globalConfigSub.cancel()
+
     def onStateChange(self, state):
         if state == SdrSource.STATE_RUNNING:
             self.handleSdrAvailable()
@@ -231,8 +244,8 @@ class OpenWebRxReceiverClient(OpenWebRxClient, SdrSourceEventClient):
 
         self.stopDsp()
 
-        while self.configSubs:
-            self.configSubs.pop().cancel()
+        while self.sdrConfigSubs:
+            self.sdrConfigSubs.pop().cancel()
 
         if self.sdr is not None:
             self.sdr.removeClient(self)
@@ -252,7 +265,7 @@ class OpenWebRxReceiverClient(OpenWebRxClient, SdrSourceEventClient):
         stack = PropertyStack()
         stack.addLayer(0, self.sdr.getProps())
         stack.addLayer(1, Config.get())
-        configProps = stack.filter(*OpenWebRxReceiverClient.config_keys)
+        configProps = stack.filter(*OpenWebRxReceiverClient.sdr_config_keys)
 
         def sendConfig(changes=None):
             if changes is None:
@@ -273,8 +286,8 @@ class OpenWebRxReceiverClient(OpenWebRxClient, SdrSourceEventClient):
             bookmarks = [b.__dict__() for b in Bookmarks.getSharedInstance().getBookmarks(frequencyRange)]
             self.write_bookmarks(bookmarks)
 
-        self.configSubs.append(configProps.wire(sendConfig))
-        self.configSubs.append(stack.filter("center_freq", "samp_rate").wire(sendBookmarks))
+        self.sdrConfigSubs.append(configProps.wire(sendConfig))
+        self.sdrConfigSubs.append(stack.filter("center_freq", "samp_rate").wire(sendBookmarks))
 
         # send initial config
         sendConfig()
@@ -295,8 +308,8 @@ class OpenWebRxReceiverClient(OpenWebRxClient, SdrSourceEventClient):
         self.stopDsp()
         CpuUsageThread.getSharedInstance().remove_client(self)
         ClientRegistry.getSharedInstance().removeClient(self)
-        while self.configSubs:
-            self.configSubs.pop().cancel()
+        while self.sdrConfigSubs:
+            self.sdrConfigSubs.pop().cancel()
         super().close()
 
     def stopDsp(self):