diff --git a/src/toolbars/SpectralSelectionBar.cpp b/src/toolbars/SpectralSelectionBar.cpp
index ae6167e44..713e62a08 100644
--- a/src/toolbars/SpectralSelectionBar.cpp
+++ b/src/toolbars/SpectralSelectionBar.cpp
@@ -265,6 +265,10 @@ void SpectralSelectionBar::ModifySpectralSelection(bool done)
          top = SelectedRegion::UndefinedFrequency;
    }
 
+   mLow = bottom;
+   mHigh = top;
+   SetBounds();
+
    // Notify project and track panel, which may change
    // the values again, and call back to us in SetFrequencies()
    mListener->SSBL_ModifySpectralSelection(bottom, top, done);
@@ -349,11 +353,25 @@ void SpectralSelectionBar::ValuesToControls()
       mWidthCtrl->SetValue(mWidth);
    }
    else {
+      SetBounds();
       mLowCtrl->SetValue(mLow);
       mHighCtrl->SetValue(mHigh);
    }
 }
 
+void SpectralSelectionBar::SetBounds()
+{
+   if (mHigh >= 0)
+      mLowCtrl->SetMaxValue(mHigh);
+   else
+      mLowCtrl->ResetMaxValue();
+
+   if (mLow >= 0)
+      mHighCtrl->SetMinValue(mLow);
+   else
+      mHighCtrl->ResetMinValue();
+}
+
 void SpectralSelectionBar::SetFrequencies(double bottom, double top)
 {
    mLow = bottom;
diff --git a/src/toolbars/SpectralSelectionBar.h b/src/toolbars/SpectralSelectionBar.h
index 953d13045..4bdd0fbf1 100644
--- a/src/toolbars/SpectralSelectionBar.h
+++ b/src/toolbars/SpectralSelectionBar.h
@@ -49,6 +49,7 @@ public:
 private:
 
    void ValuesToControls();
+   void SetBounds();
    void OnUpdate(wxCommandEvent &evt);
    void OnCtrl(wxCommandEvent &evt);
    void OnChoice(wxCommandEvent &evt);
diff --git a/src/widgets/NumericTextCtrl.cpp b/src/widgets/NumericTextCtrl.cpp
index 99ad5892a..a17d65d95 100644
--- a/src/widgets/NumericTextCtrl.cpp
+++ b/src/widgets/NumericTextCtrl.cpp
@@ -531,6 +531,9 @@ NumericConverter::NumericConverter(Type type,
                                    double value,
                                    double sampleRate)
 {
+   ResetMinValue();
+   ResetMaxValue();
+
    mDefaultNdx = 0;
 
    mType = type;
@@ -904,7 +907,7 @@ void NumericConverter::ControlsToValue()
       t = frames * 1.001 / 30.;
    }
 
-   mValue = t;
+   mValue = std::max(mMinValue, std::min(mMaxValue, t));
 }
 
 void NumericConverter::SetFormatName(const wxString & formatName)
@@ -935,6 +938,35 @@ void NumericConverter::SetValue(double newValue)
    ControlsToValue();
 }
 
+void NumericConverter::SetMinValue(double minValue)
+{
+   mMinValue = minValue;
+   if (mMaxValue < minValue)
+      mMaxValue = minValue;
+   if (mValue < minValue)
+      SetValue(minValue);
+}
+
+void NumericConverter::ResetMinValue()
+{
+   mMinValue = std::numeric_limits<double>::min();
+}
+
+void NumericConverter::SetMaxValue(double maxValue)
+{
+   mMaxValue = maxValue;
+   if (mMinValue > maxValue) {
+      mMinValue = maxValue;
+   }
+   if (mValue > maxValue)
+      SetValue(maxValue);
+}
+
+void NumericConverter::ResetMaxValue()
+{
+   mMaxValue = std::numeric_limits<double>::max();
+}
+
 double NumericConverter::GetValue()
 {
    ControlsToValue();
@@ -1073,6 +1105,8 @@ void NumericConverter::Adjust(int steps, int dir)
                mValue = 0.;
             }
 
+            mValue = std::max(mMinValue, std::min(mMaxValue, mValue));
+
             mValue /= mScalingFactor;
 
             if (!mNtscDrop)
@@ -1615,7 +1649,7 @@ void NumericTextCtrl::OnKeyDown(wxKeyEvent &event)
    if (!mReadOnly && (keyCode >= '0' && keyCode <= '9')) {
       int digitPosition = mDigits[mFocusedDigit].pos;
       if (mValueString[digitPosition] == wxChar('-')) {
-         mValue = 0;
+         mValue = std::max(mMinValue, std::min(mMaxValue, 0.0));
          ValueToControls();
          // Beware relocation of the string
          digitPosition = mDigits[mFocusedDigit].pos;
diff --git a/src/widgets/NumericTextCtrl.h b/src/widgets/NumericTextCtrl.h
index 631042e01..87cfec599 100644
--- a/src/widgets/NumericTextCtrl.h
+++ b/src/widgets/NumericTextCtrl.h
@@ -71,6 +71,10 @@ public:
    void SetFormatString(const wxString & formatString);
    void SetSampleRate(double sampleRate);
    void SetValue(double newValue);
+   void SetMinValue(double minValue);
+   void ResetMinValue();
+   void SetMaxValue(double maxValue);
+   void ResetMaxValue();
    double GetValue();
 
    wxString GetString();
@@ -95,6 +99,9 @@ protected:
 
    double         mValue;
 
+   double         mMinValue;
+   double         mMaxValue;
+
    wxString       mFormatString;
 
    NumericFieldArray mFields;