Why does the audio sound different than the original ?

Hi ! i have the following code :

 var testClip :AudioClip; 
 var aS :AudioSource;
 function Start () {
     // Create a new audio clip
     var newClip : AudioClip = AudioClip.Create("Test",testClip.samples * 8,testClip.channels,testClip.frequency,false);
     // Create a float array to hold the new clip data 
     var loopData : float [] = new float[testClip.samples * 8];
     // Create a float array to hold the new test clip data
     var testClipData : float[] = new float [testClip.samples];
     // Load the test clip data 
     if( testClip.LoadAudioData() == true){
         // Get the test clip data
         testClip.GetData(testClipData,0);
         var nextSamplePosition : int = 0;
         var sampleI : int;
         // Add test clip data to the new clip 
         for( var sN = 0 ; sN < loopData.Length ; sN ++) {
             if( sN >= nextSamplePosition   ) {
                 if(sampleI < testClipData.Length) {
                     loopData[sN] = testClipData[sampleI];
                     sampleI ++;
                 }else{
                     nextSamplePosition += testClip.samples *2;
                     sampleI = 0;
                 }
                 
             }
         }
         // Set new clip data
         newClip.SetData(loopData,0);
         aS.clip = newClip;
         Debug.Log("Ready");
     }
 }

So basically i created a audio clip 8 times larger than the test clip , then i added the test clip to this new clip in a sequence just as a test , when i play the new clip it sounds different than the test clip , it plays at a slightly higher frequency , only noticeable on lower frequency sounds like a kick drum. The question is why ? Hope someone can help , thanks in advance.