ProSoundWeb Community

Sound Reinforcement - Forums for Live Sound Professionals - Your Displayed Name Must Be Your Real Full Name To Post In The Live Sound Forums => SR Forum Archives => LAB Subwoofer FUD Forum Archive => Topic started by: Andres Gonzalez on November 02, 2004, 05:23:48 PM

Title: HPF vs. vented box tuning
Post by: Andres Gonzalez on November 02, 2004, 05:23:48 PM

In all of my calculations, it shows that the x-max is reached with in a few hertz of the vented box tuning. The minimum excursion happens at the box tuning, then shoots way up fast as you go down in freq.  My question is this:  what should your high-pass frequency be set to given the box tuning?  The high-pass I use is usually 24 db/octave butterworth. But if my box tuning is for example 36 Hz, what high pass should I use to insure that I do not exceed the maximum excursion?

thanks,

gonzo

Title: Re: HPF vs. vented box tuning
Post by: Michael_Elliston¶ on November 04, 2004, 04:10:23 AM

I cant tell you because i dont know the Power,Xmax,Fb,Vb nor driver specifications.

Considering that having the -3db point of filter AT the tuning would just result in slightly lower output at tuning (only just audible) then this isnt a bad place to start in theory.

Try a 'couple of hz' lower.

winisd pro + update can model FIlter + subwoofer alignment and show excursion (beta)

www.linearteam.dk

Cheers