How accurate is that winISD program... If any of you even use it. I think the point of it is to find the optimum tuning frequency for your box and subs and what the SPL of that will be.
Anyway, I put in all of the information for my subs and box and whatever, but for the plot section(where it says SPL it says to enter power and distance. I am not sure what to enter for those places. I just threw in 20ft at 1200W just as a guess and when i finally finished entering all of that in i checked the SPL part and it said that It peaked at 107.72dB @40.31Hz.(the SPL seemed low, but the Hz seemed good).
I put in 2 alpine type-r 12s and a 4 cube box 33x14x25.75. (tuned to 35hz)
Does the SPL seem low to anyone? I went to a comp the other day[without my car ] and when i listened to cars that were being metered i kind of expected to be around 130dBs from what I heard.
i myself have never used the program but i figure distance would be something like 5ft. since that is about how far a normal person would sit from the subs in a car...and 20ft would be outside of the car....