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12pi hornsub questions [message #88484] Sun, 22 July 2018 01:04 Go to next message
noviygera is currently offline  noviygera
Messages: 23
Registered: June 2009
Location: United States
Chancellor
Hello,

I'm evaluating the 12pi horns for my application. Home use, 2 channel music. They will need to mate with my mid and high horns.

What's the horn path length?
What would it take to make 12pi play up to 250hz? What part of their geometry makes them roll off above 120hz, as I can see from hornresp simulation?

thanks,
Herman
Re: 12pi hornsub answers [message #88486 is a reply to message #88484] Sun, 22 July 2018 11:16 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 17321
Registered: January 2001
Illuminati (33rd Degree)

The horn path length is 9.3 feet. Upper frequency rolloff is due to mass rolloff, front chamber volume and horn folds. Mass rolloff, front chamber volume and flare are incorporated in the Hornresp model, but the specific folds aren't. That's what tends to make it rolloff a little lower than what the model shows.
Re: 12pi hornsub answers [message #88492 is a reply to message #88486] Tue, 24 July 2018 01:36 Go to previous messageGo to next message
noviygera is currently offline  noviygera
Messages: 23
Registered: June 2009
Location: United States
Chancellor
Wayne,

thanks for responding. Possibly in the future, when I build the WE 13a horns, I would be ok with 100hz upper frequency rolloff. I plan to start that project in the near future. However, my current mids play down to 250hz -3db. Out of curiosity and actual current need, what design changes would it take to bring the upper rolloff freq of 12pi to 250hz? Is it possible?

thanks,
Herman
Re: 12pi hornsub answers [message #88496 is a reply to message #88492] Tue, 24 July 2018 08:42 Go to previous message
Wayne Parham is currently offline  Wayne Parham
Messages: 17321
Registered: January 2001
Illuminati (33rd Degree)

I think if you could extend the upper cutoff if you unfolded the horn and made it straight.

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