Hi!
I've made those speakers, but I have problem with calculating bass refle tube. Now I have 6cm diameter and 14cm long. I can't modify winisd parameter for length. I tried using few equations to calculate it, but results were different. Can somebody please advise?
I've made those speakers, but I have problem with calculating bass refle tube. Now I have 6cm diameter and 14cm long. I can't modify winisd parameter for length. I tried using few equations to calculate it, but results were different. Can somebody please advise?
Try with Unibox or Woofer Box and Circuit Designer.
Both are Excel based. The longer the vent, the lower the Fb.
Both are Excel based. The longer the vent, the lower the Fb.
According to Gorann's pages SR71 original box tuning is 44 Hz with a 14 l box :
www.audioexcite.com ZaphAudio ZA-SR71 Review!
If the internal diameter of the the tube is 6cm then the lenght should be around 25 or 27 cm.
If you use 4.7 cm then the lenght comes around 13 or 16 cm. Depending of the simulation software used.
I always measure box tuning, pretty easy with an impedance measurement with REW or ARTA. Box tuning is the value where the phase curve cross the 0 degree value.
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It may be a little short, try to find a 16 cm lenght tube. You can simply use plumbing tubes and make a round chanfrein on them or on the back pannel. From Zaph design box you can see that the port is 2" (5cm) and the lenght around 15 cm.
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