Unusual speaker cabinet design

[Silent Screamer]

Sorry to hear about your dad going blind Scott... Tried opening the doc but says it's corrupt.

 

[planet10]

Tried opening the doc but says it's corrupt.

same here.

dave

 

[Jack Caldwell]

Opened OK using Mac

It opened fine on my Macbook. It's an article from AudioExpress April 2010 titled Stuffing and Sound Speed, written by Cornelius Morton. Interesting stuff.

 

[Silent Screamer]

Hi Jack did it open the whole doc? the download got to about 1.08MB and then the message came up again. Possibly the Mac is displaying as it downloads and may be missing the end?

If you have got an uncorrupt copy, can you resave and upload please.

 

[tvrgeek]

I don't understand the concept. Are there different length tubes inside the box with one end closed? How does this work?

Each is a filter, a Helmholtz resonator. This was also written up Speaker Builder. It worked fine, but really was no advantage as you don't need a wide band filter, you need one to control the drivers resonance, so a single band filter ( box ) works fine.

 

[ScottMorton]

I extracted the article and attached to this post. Just a little new to this forum and learning the ropes.

Regards,
Scott

 

[SY]

Hi Scott, are you the author?

edit: Never mind, I see it was your father. Did AX give reprint permission? They're usually really good about that.

 

[planet10]

When i last talked to Ed about posting a published article he said, no problem, please just wait 30 days after the print copy hits the stands.

dave

 

[Keriwena]

Thanks for that, Scott. Great to have this sort of research available. And now, saved and preserved on computers all over the world. Your Dad's work will not be forgotten.

 

[ScottMorton]

From what I understand in studying this design and speaking with my father, these are not "wide band" filters. They are tuned single frequency tubes around the resonance of the driver which has a wider band(bell curve) and therefore the need for a few tubes of narrow band filtering. This is not something you could achieve with just a box which would most likely turn the bell curve into more of an 'M' shape if you managed to tune the box in the middle of the resonance frequency of the driver, best wishes with that idea.

 

[Trask]

I have a pair of Hegeman 1A speakers, and can attest that the bass response is wonderful for the size speaker it is. Its depth is uncanny at time. I do wish someone would commercially produce a subwoofer using the Hegeman loading, as I think it would be very successful. Or simply reproduce Hegeman's design in a full range speaker, as Morrison has done (don't know if his speakers are still in production).