remove device from multi vm's

hi

how i can remove the HD sound from all virtual macine in the cluster

i try this but its not work

$vmName="*"

$vm=Get-VM-Name$vmName
$audio=$vm.ExtensionData.Config.Hardware.Device|where {$_.GetType().Name-eq"VirtualHdAudioCard"}

$spec=New-ObjectVMware.Vim.VirtualMachineConfigSpec
$dev=New-ObjectVMware.Vim.VirtualDeviceConfigSpec
$dev.Device=$audio
$dev.Operation="remove"
$spec.deviceChange+=$dev

$vm.ExtensionData.ReconfigVM($spec)