Jump to content

Problem finding Fc of a sealed enclosure using IM-SG


Recommended Posts

Hi, I am having trouble finding the Fc of a sealed enclosure using the IM-SG. I have followed the instructions in the manual: connect the leads to the speakers, turn on unit, start at lowest frequency and increase until you find peak impedance. The problem is it tells me peak impedance is 8.4 ohms at 30.X hz, fluctuates around 30.1-30.3. It drops to 5-6 ohms as you keep increasing frequency, then goes up to 7.6-7.7 at around 65 hz.

The setup is two Elemental Design's EHQS 12s in a truck box, less than 2.0 cubes sealed. These subs never had much output below about 50-60 hz, in fact they are inaudible using the IM-SG at the 30-40 hz range. I am more curious than anything, am I seeing a second resonance a full octave below the "real" Fc, and that's what the IM-SG is reading at 30 hz? Or is it possible for the Fc of a box to be much much lower than the usable output bandwidth?

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Recently Browsing   0 members

    • No registered users viewing this page.
  • Who's Online   1 Member, 0 Anonymous, 452 Guests (See full list)

×
×
  • Create New...