Is there a general rule of thumb to pricing audio rough in? I am planning on using 14/2 cable brought from each speaker back to future keypad. I will then run a 14/4 and cat5 from keypad down to server room in basement. In general, do you do unit pricing? for example $200 per 2 speaker zone and $300 for 4 speaker zone? Or, do you price based on how much material you think you are going to use plus an time estimate of how long its going to take in labour?