Purchased a lot of Sonos products in 2 homes. Recently had a brand new amp installed and it is defective. Went through hours waiting on phone for technical support, finally connected with them, diagnosed it and confirmed it was defective after almost another hour on the phone. Agree to send me a new amp, charge my credit card and they will credit me when I return it. OK fine Just received the replacement amp and it is a refurbished amp. So I get a refurbished amp for a defective new unit I just purchased. Trying to resolve and email response says it may take 2-3 days. Might want to think twice about your options when choosing a supplier.