B&C 18TBW100-4 18" Professional Subwoofer 4 Ohm (parts-express.com)
The website says 6cuft tuned at 35.5hz but I was told that didn't model well.
I couldn't figure out how to model a subwoofer could someone please help me with this. I will be running it with a Crown XLS 1502 so it will be getting 1500 watts rms. How would 4cuft tuned at 34hz look. I want huge back slam it will be put directly behind my seated position. Could someone please model this and tell me if this combination will work good? I had someone model it for me and said it was good but I wanted a second opinion because 4cuft sounds small to me. The port will be 3" tall x 18" wide x 26" long just fyi.
I have done the best model I can. The driver is not really designed for vented application, but for sealed. This makes it tricky to model for vented application.
This is also not a very high quality unit, with a somewhat crude VC with high inductance, so it is hard to really smooth the response to acceptable levels.
However I have played with it and have come up with an acceptable design. The best vented volume is 4.5 cu.ft.
I have attached your model. F3 is 38.76 Hz.
I have to say, you have not yet got the hang of how you go about designing a speaker. You can't pull a tuning frequency out of the back of your neck. You can only design according to the T/S parameters of the driver and what that allows. This design I think is in line with what you were hoping for.
The biggest challenge designing with this driver is getting a reasonable smooth response and not a peaked one note wonder.
The cone is properly controlled in this design and the vent air velocity is a very acceptable range, and the vent resonance out of the audible range.
So this design will work for you.
