Quoted from thedefog:If it was disconnected when you bought it, there is a reason.
I wish it was more common to see notes on a machine when things are disconnected... Was this unplugged because it was cooking boards or because the person just didn't like it? I just went through this with the sub in my HS2. It was taken out of the series deliberately.... After hours of trying to figure out why, I rewired it back in and it seems to be working fine... So who knows.