diff --git a/widegraph.cpp b/widegraph.cpp
index 1468896..361728e 100644
--- a/widegraph.cpp
+++ b/widegraph.cpp
@@ -402,9 +402,13 @@ void WideGraph::setFilter(int a, int b){
         high = low + m_filterMinWidth;
     }
 
+    int width = high - low;
+    int center = low + width / 2;
+
     // update the filter history
     m_filterMinimum = low;
     m_filterMaximum = high;
+    m_filterCenter = center;
 
     // update the spinner UI
     bool blocked = false;
@@ -420,10 +424,15 @@ void WideGraph::setFilter(int a, int b){
     }
     ui->filterMaxSpinBox->blockSignals(blocked);
 
+    blocked = ui->filterCenterSpinBox->blockSignals(true);
+    {
+        ui->filterCenterSpinBox->setValue(center);
+    }
+    ui->filterCenterSpinBox->blockSignals(blocked);
+
     // update the wide plot UI
-    int width = high - low;
-    ui->widePlot->setFilterCenter(low + width/2);
-    ui->widePlot->setFilterWidth(high - low);
+    ui->widePlot->setFilterCenter(center);
+    ui->widePlot->setFilterWidth(width);
 }
 
 void WideGraph::setFilterMinimumBandwidth(int width){
@@ -437,6 +446,7 @@ void WideGraph::setFilterEnabled(bool enabled){
     // update the filter spinner
     ui->filterMinSpinBox->setEnabled(enabled);
     ui->filterMaxSpinBox->setEnabled(enabled);
+    ui->filterCenterSpinBox->setEnabled(enabled);
 
     // update the checkbox ui
     bool blocked = ui->filterCheckBox->blockSignals(true);
@@ -722,6 +732,11 @@ void WideGraph::on_filterMaxSpinBox_valueChanged(int n){
     setFilter(m_filterMinimum, n);
 }
 
+void WideGraph::on_filterCenterSpinBox_valueChanged(int n){
+    int delta = n - m_filterCenter;
+    setFilter(m_filterMinimum + delta, m_filterMaximum + delta);
+}
+
 void WideGraph::on_filterCheckBox_toggled(bool b){
     setFilterEnabled(b);
 }
diff --git a/widegraph.h b/widegraph.h
index a300d93..fd0392c 100644
--- a/widegraph.h
+++ b/widegraph.h
@@ -99,6 +99,7 @@ private slots:
   void on_sbPercent2dPlot_valueChanged(int n);
   void on_filterMinSpinBox_valueChanged(int n);
   void on_filterMaxSpinBox_valueChanged(int n);
+  void on_filterCenterSpinBox_valueChanged(int n);
   void on_filterCheckBox_toggled(bool b);
   void on_filterOpacitySpinBox_valueChanged(int n);
 
@@ -126,6 +127,7 @@ private:
   qint32 m_filterMinWidth;
   qint32 m_filterMinimum;
   qint32 m_filterMaximum;
+  qint32 m_filterCenter;
   qint32 m_waterfallAvg;
   qint32 m_TRperiod;
   qint32 m_nsps;