Originally Posted by
Earl K
- I can't explain your results from using that calculator . It shows me, 3.85" for a 4" diameter tube in a 2 cu' box giving a 50hz tuning. That's a wide variation from your results. I do notice that you started this thread talking about a 50hz tuning ( in 2cu' ) and now you seem to be looking at a 40hz tuning ( in a 4cu' ). BTW, 7" plus, is in the low 40hz tuning range / the online calculator suggests 7.66 for 40hz in a 2 cu' enclosure - my software suggests 7.728" ).
Personally, for this 12" / & according to the "look" of the SIMS I ran - I'd go with a 55 hz tuning. That's plenty low for surround ("helper") speakers / especially when subs are present .