I'm having trouble setting up a file for a Dayton Audio UM18 on WinISD. Can someone tell me what I'm doing wrong?
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You entered too much information. WinISD calculates to a higher degree of accuracy than manufacturer data sheets, so if you enter all the data sheet information WinISD will find the data sheet inaccuracies as errors. For instance, don't enter Qes, Qms and Qts. Just enter Qes and Qms, let the program calculate Qts. You only need to enter about 1/3 of the data, the program will handle the rest.I'm having trouble setting up a file for a Dayton Audio UM18 on WinISD. Can someone tell me what I'm doing wrong?
You have to model the box at the maximum power level you intend to run at, then look at the rear port velocity. Use as much vent area as required to keep the velocity less than 20 within the pass band. You can specify one large port, or any number of smaller ones, of any shape. What matters is the total area.WinISD is showing a single round 4 inch vent 4.16 inches long, This does not seem right. Is it?
Look at the Maximum SPL chart. In an average room you can add 8dB/octave of sensitivity below 30Hz to account for cabin gain. Also add 6dB for two subs versus one. BTW, bass traps have no effect below 80Hz or so. They really should be called midbass traps.Will 2 of these be enough to play flat down to 15-20 Hz at 110 dB? I have a lot of bass traps in the room.