Quote:
brent_s wrote:
 My WinISD Pro v.50a7 model of the 390HO in 2.3 ft^3 sealed with no EQ has a Qtc of .661. With 180watts at 20hz, SPL is 97.06 dB at 1m and excursion is 8.4mm. Excursion limited power is 365 watts. If I use 180 watts as the input power with 3dB of boost at 20hz (PEQ 20hz/+3dB/Q=.1), WinISD will then show 100.06dB/11.9mm at 20hz since +3dB requires 2x power. I think you're assuming WinISD is including the +3dB in your 180 watt input when it's really just the baseline that the boost is then applied to.
-Brent |
Brent,
Your numbers sound closer to correct to me. I was not adding room gain or any filter in WinISD. But looking at my numbers they are a full 6db higher then yours. Maybe I messed up the parameter entry for the 390HO. I am getting a qtc of .657. I am guessing I have Sd wrong. I have the diameter as 380mm. Maybe your number is taking into account for the surround? But I guess that isn't enough of a difference to really matter... I am running the same version of WinISD.