Listar todas las Features activas de un Site Collection - SharePoint

$allSiteFeatures = Get-SPFeature | Where-Object { $_.Scope -eq "Site" }
$activeFeatures = Get-SPFeature -Site "http://sitecollectionUrl"

$allSiteFeatures | ForEach-Object {
$active = $false
    foreach($feature in $activeFeatures)
    {
      if($feature.Id.ToString() -eq $_.Id.ToString())
      {
         $active = $true
      }
    }
    if(!$active)
    {
       $_ | DisplayName,ID
    }
}