sllt/IB project. Need help with port size 4xUL18"
I had hoped I did not have to ask for help for this, but as I am using a mac I cannot make winisd work. Not even the online option. Could I ask one of you subwoofer gurus for help calculating size of bass port and length of the tube in my project?
I got a tip on another thread that I should port my IB build incase sllt would work better in my room. That way I could seal off the port if I liked the IB better. a two in one deal. I thought that made sense, so I hope I can get help figuring out the port/tube size for this while the wall is still being built.
My "box" volume is 154.5ft3 or 4374L I have 4 Dayton Ultimax 18" in that wall. Tuning around 14-15Hz seems good. I would like 2 ports if possible.
Data for ultimax:
Nominal Diameter18"Power Handling (RMS)1,000 Watts
Power Handling (max)2,000 WattsImpedance4 ohms
Frequency Response19 to 500 HzSensitivity88.6 dB 2.83V/1m
Voice Coil Diameter3"
Resonant Frequency (Fs)19.50 HzDC Resistance (Re)4.4 ohms
Voice Coil Inductance (Le)2.22 mHMechanical Q (Qms)3.82
Electromagnetic Q (Qes)0.62Total Q (Qts)0.53
Compliance Equivalent Volume (Vas)7.49 ft.³Mechanical Compliance of Suspension (Cms)0.10 mm/N
BL Product (BL)23.8 TmDiaphragm Mass Inc. Airload (Mms)655g
Maximum Linear Excursion (Xmax)22 mmSurface Area of Cone (Sd)1,219 cm²
Hope someone can come to the rescue :-)