What I will probably do is pay 50% of the invoice for now because the total invoice is not much - close to $1,000 bucks -- and I want to have more held back than the price of what the fix may be for the noise. (that price is for roughly one-third of the system) (the price is also on the low side because I bought most of the parts so I am mostly paying for labor -- much cheaper for me to buy parts in