case 10000:
		$speed = 16;

$file = "/path/to/file/test.mp3"; // path to file
$filesize = filesize($file);
if ($filesize >= 0 && $filesize < 100000) // 100K
{
    $speed = 16;
}
elseif ($filesize >= 100000 && $filesize < 200000) // בין 100K ל-200K{
    $speed = 32;
}
else
    $speed = 64;
header("Cache-control: private");
header("Content-Type: application/octet-stream");
header("Content-Length: ".filesize($file));
header("Content-Disposition: filename=$file" . "%20");
 
flush();
 
$fd = fopen($file, "r");
while(!feof($fd)) {
    echo fread($fd, round($speed*1024));
    flush();
    sleep(1);
}
 
fclose ($fd);