Thoughts on my design?

I'm a newbie here; trying to design a sub for HT use. My goals are 105dB at 20-80 Hz.

I modeled an ESB sub using a Dayton 15" Titanic driver in WinISD and the initial graphs look very promising.

However, I'm probably making numerous newbie mistakes and would like comments from the more experienced crowd here.

I've posted my model at http://www.nogginboink.com/subwoofer_design1.htm. I'd greatly appreciate any feedback any of you might have on this design.

:cannotbe: :smash: -Nogginboink
 
Thanks for the tip!

I ran another model with the driver's published Le and it bumped the output by about 1dB from 40-120 Hz.

I also updated my graphs on my webpage to show predictions with and without the EQ.

Is anyone able to tell me what that huge impedance spike is going to do to my sub? Are there other graphs that would help analyze this design that I could provide?

:cannotbe: :smash: -NogginBoink
 

roddyama

diyAudio Moderator Emeritus
2002-01-19 9:25 am
Michigan
When the woofer operates at or near it fs the cone excursions increase dramatically causing the impedance to increase. In the case of a vented box design, this impedance peak is usually split into two smaller peaks, one above and one below the box f3. Your impedance peak of 47ohm is not unusual.