Hornresp, TQWT, MLTL, and WTF

Hello experts. I am learning how to use Hornresp and think I finally have a grip on how it works, at least enough to load a driver, select the enclosure, and mess with the shape and size of the enclosure. I am trying to model a TQWT and MLTL to see if a concept I have is possible. I am unfamiliar with those designs but wanted to venture beyond sealed and BR. I am building a 2-way loudspeaker so the woofer will need to play smoothly up to its crossover point. As I mess around with the cross-section areas, lengths, driver placement, and stuffing, I can't seem to get rid of the (what appears to be) harmonics. If I were building a subwoofer cabinet, I wouldn't care because all the ripples would be above the cutoff frequency.

My actual questions are:

Is Hornresp displaying the predicted response accurately or is the ringing showing up on the graph just noise above a certain point?
Should I be able to see a relatively flat response graph like I would with Winisd?
Are harmonics a function of these types of enclosures?
Is there any other software besides Hornresp to model these types of enclosures?

Thank you in advance!
 
  • Like
Reactions: emc71
Greets!

HR doesn't include any acoustic damping, so you're seeing a 'perfect' set of eigenmodes that you can deal with in the LW.

No, you'll see a much more accurate response in HR with/without damping whereas a basic T/S program assumes a ~uniform particle density and from long experience have learned that a smooth looking TL, etc., is way over-damped for the majority of folks to the point where quite a few have pulled out most/all of the suggested densities from the few advanced programs I've used, so finally quit suggesting any beyond the pioneer's basic one side, top, back to 'taste' 😉.

Yes: Air Column Resonance

There's other programs with MJK's the best one I know of no longer available, so with HR nowadays matching up well with it see no reason to look further.
 
Greets!

HR doesn't include any acoustic damping, so you're seeing a 'perfect' set of eigenmodes that you can deal with in the LW.

No, you'll see a much more accurate response in HR with/without damping whereas a basic T/S program assumes a ~uniform particle density and from long experience have learned that a smooth looking TL, etc., is way over-damped for the majority of folks to the point where quite a few have pulled out most/all of the suggested densities from the few advanced programs I've used, so finally quit suggesting any beyond the pioneer's basic one side, top, back to 'taste' 😉.

Yes: Air Column Resonance

There's other programs with MJK's the best one I know of no longer available, so with HR nowadays matching up well with it see no reason to look further.
Thank you for this. It definitely clears up what I see on the graph! And also thanks for all the additional information!
 
  • Like
Reactions: GM