can hornresp model this simple horn with Helmholtz resonator ?

[freddi]

if so, what input ?

fwiw I ran the following simplified sim for Stu Hegeman's EICO HFS-2

And details on the EICO's HFS-2

https://i.imgur.com/7GfHkI8.jpg

 

[David McBean]

if so, what input ?

Hi Fred,

The attached example should get you somewhere near to what you are looking for.

Kind regards,

David

 

[freddi]

Thanks David - I'll play around with that model and see what it does.

Best Wishes,
Fred

 

[freddi]

here's what I see with a real rough model of the 1958 EICO HFS2 cabinet from Stu Hegeman loaded with a Fostex FE206EN. I didn't set the ~3 liter resonator's vent area to the size shown in the plans so will go back and see if that matters much.

At Roger Russell's website, there's a re-print of the 1961 interview with Mr. Hegeman

Eico HFS-2 Advertisement

 

[snappyturtle]

I think these old school cabinets are pretty cool. couple of questions....
do the "Helmholtz resonators" actually do anything in this design, or is it basically just blocked off space?
is there anything gained by the odd sized and restricted horn exits? what would happen if the exits were sized similarly to the last section of the horn?

 

[BP1Fanatic]

Yeah, an enclosure like that needs a plexiglass cover to show off the internals!

 

[freddi]

it looks like (as one might expect) the mass loading from choking down mouth area with slots, reduces gain over a certain area. Hegeman spoke of cutting down upper bass gain to balance the EICO HFS-2 Lowther based speaker.

- dunno about the resonator - if made larger, then could make a suck-out around 110Hz.