diff --git a/source/analyzer.cpp b/source/analyzer.cpp
index 73149ec..cf51fcb 100644
--- a/source/analyzer.cpp
+++ b/source/analyzer.cpp
@@ -45,11 +45,11 @@ void analyzer::on_pushButton_calculate_clicked()
         delete [] songList;
     }
     countSongs=0;
-    QDirIterator it_counter(ui->lineEdit_path->text(), {"*.mp3", "*.wav", "*.flac", "*.ogg"}, QDir::NoFilter, QDirIterator::Subdirectories);
+    QDirIterator it_counter(ui->lineEdit_path->text(), {"*.mp3", "*.wav", "*.flac", "*.ogg" ,"*.opus", "*.wv", "*.mpc"}, QDir::NoFilter, QDirIterator::Subdirectories);
     while (it_counter.next()!="") {
         countSongs+=1;
     }
-    QDirIterator it(ui->lineEdit_path->text(), {"*.mp3", "*.wav"}, QDir::NoFilter, QDirIterator::Subdirectories);
+    QDirIterator it(ui->lineEdit_path->text(), {"*.mp3", "*.wav", "*.flac", "*.ogg" ,"*.opus", "*.wv", "*.mpc"}, QDir::NoFilter, QDirIterator::Subdirectories);
     unsigned int k=0;
     songList=new csong[countSongs];
     float preferedLoudness=ui->doubleSpinBox_preferredLoudness->value();
diff --git a/source/mainwindow.cpp b/source/mainwindow.cpp
index 7cb8f2d..38cd0e6 100644
--- a/source/mainwindow.cpp
+++ b/source/mainwindow.cpp
@@ -112,8 +112,11 @@ void MainWindow::on_pushButton_requestLimiter_clicked()
     }else if (vAmpsens_dBu<vMaxAmpInPeak){
         QMessageBox msgBox(QMessageBox::Warning,"Amplifier can't deliver maximum peak power","The maximum power level of the amplifier is below the maximum peak power level of the speaker. To protect the speaker from a distorted signal the amplifier might deliver, a peak limiter is required with the amplifiers input sensitivty set as its threshold.");
         msgBox.exec();
-
-        ui->label_thresholdRMS->setText(QString::number(thresholdRMS,'f',1)+QString(" dBFS"));
+        if (QString::number(thresholdRMS,'f',1)==QString::number(-18-(ui->spinBox_digitalNominalLevel->value()-vAmpsens_dBu),'f',1)){
+            ui->label_thresholdRMS->setText(QString("not required"));
+        }else{
+            ui->label_thresholdRMS->setText(QString::number(thresholdRMS,'f',1)+QString(" dBFS"));
+        }
         ui->label_attackTimeRMS->setText(QString::number(attackTimeRMS,'f',2)+QString(" ms"));
         ui->label_releaseTimeRMS->setText(QString::number(releaseTimeRMS,'f',2)+QString(" ms"));
         ui->label_UMaxSpeakerInRMS->setText(QString::number(vMaxSpeakerInRMS,'f',2)+QString(" dBU (")+QString::number(qSqrt(speakerImp*speakerRMS),'f',2)+QString(" V)"));