diff --git a/mainwindow.cpp b/mainwindow.cpp
index 71f6ce0..31518d0 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -17,8 +17,8 @@ MainWindow::MainWindow()
     connect(dock->sampleRate, SIGNAL(textChanged(QString)), this, SLOT(setSampleRate(QString)));
     connect(dock, SIGNAL(fftSizeChanged(int)), this, SLOT(setFFTSize(int)));
     connect(dock->zoomLevelSlider, SIGNAL(valueChanged(int)), this, SLOT(setZoomLevel(int)));
-    connect(dock->powerMaxSlider, SIGNAL(valueChanged(int)), &spectrogram, SLOT(setPowerMax(int)));
-    connect(dock->powerMinSlider, SIGNAL(valueChanged(int)), &spectrogram, SLOT(setPowerMin(int)));
+    connect(dock->powerSlider, SIGNAL(upperValueChanged(int)), &spectrogram, SLOT(setPowerMax(int)));
+    connect(dock->powerSlider, SIGNAL(lowerValueChanged(int)), &spectrogram, SLOT(setPowerMin(int)));
 }
 
 bool MainWindow::eventFilter(QObject * /*obj*/, QEvent *event)
diff --git a/spectrogramcontrols.cpp b/spectrogramcontrols.cpp
index c57d4bc..de6cd3f 100644
--- a/spectrogramcontrols.cpp
+++ b/spectrogramcontrols.cpp
@@ -26,15 +26,10 @@ SpectrogramControls::SpectrogramControls(const QString & title, QWidget * parent
 	zoomLevelSlider->setValue(0);
 	layout->addRow(new QLabel(tr("Zoom:")), zoomLevelSlider);
 
-	powerMaxSlider = new QSlider(Qt::Horizontal, widget);
-	powerMaxSlider->setRange(-100, 20);
-	powerMaxSlider->setValue(0);
-	layout->addRow(new QLabel(tr("Power max:")), powerMaxSlider);
-
-	powerMinSlider = new QSlider(Qt::Horizontal, widget);
-	powerMinSlider->setRange(-100, 20);
-	powerMinSlider->setValue(-50);
-	layout->addRow(new QLabel(tr("Power min:")), powerMinSlider);
+	powerSlider = new QxtSpanSlider(Qt::Horizontal);
+	powerSlider->setRange(-100, 20);
+	powerSlider->setSpan(-50, 0);
+	layout->addRow(new QLabel(tr("Power range:")), powerSlider);
 
 	widget->setLayout(layout);
 	setWidget(widget);
diff --git a/spectrogramcontrols.h b/spectrogramcontrols.h
index 7c278a7..e0b3b74 100644
--- a/spectrogramcontrols.h
+++ b/spectrogramcontrols.h
@@ -5,6 +5,7 @@
 #include <QLineEdit>
 #include <QPushButton>
 #include <QSlider>
+#include "qxtspanslider.h"
 
 class SpectrogramControls : public QDockWidget {
 	Q_OBJECT
@@ -26,6 +27,5 @@ public:
 	QLineEdit *sampleRate;
 	QSlider *fftSizeSlider;
 	QSlider *zoomLevelSlider;
-	QSlider *powerMaxSlider;
-	QSlider *powerMinSlider;
+	QxtSpanSlider *powerSlider;
 };
\ No newline at end of file