First try at a simple tapped horn in hresp/akabak

[Sidi]

Any tips on how to beat down those 80Hz and higher peaks down a bit? Will post akabak results when I actually come up with a layout for this 6cuft behemoth.

If I get a decent result and progressed viability, I'm going to build two of these for home theater use.

Note, Eg=50V

[billfitzmaurice]

Re: First try at a simple tapped horn in hresp/akabak

Any tips on how to beat down those 80Hz and higher peaks down a bit? Will post akabak results when I actually come up with a layout for this 6cuft behemoth.

Go larger, a lot larger. A 6 cu ft bass horn isn't a behemoth, it's a midget. For a 20Hz horn 16 cu ft is about the minimum for a result that makes the added complexity of the horn worthwhile.

[Sidi]

Re: First try at a simple tapped horn in hresp/akabak

getting larger seems to end up just more and more variance in my passband. very high Q peaks.

I did note this is a TH not a front loaded horn though, yes? Perhaps I'll take a look at a standard horn too.

[billfitzmaurice]

Re: First try at a simple tapped horn in hresp/akabak

getting larger seems to end up just more and more variance in my passband. very high Q peaks.

I did note this is a TH not a front loaded horn though, yes? Perhaps I'll take a look at a standard horn too.

THs aren't as easy as some make them out to be, and not all drivers will work well in them. Most THs I see aren't sufficiently better than VBs to be worthwhile. Tom Danley hasn't yet heard footsteps coming up behind him.

[Sidi]

Re: First try at a simple tapped horn in hresp/akabak

We all have to start somewhere :D

[Taterworks]

Re: First try at a simple tapped horn in hresp/akabak

My tapped horn experiments in Hornresp usually start out with a 1:3 expansion, with S0 (narrow end cross section area) being equal to 1/2 Sd (piston area of driver), and SL (mouth cross section area) being 3 times that. From there, you can vary the length of the horn, S0, and SL to modify the behavior of the horn to suit the particular driver. You don't want a throat that is less than 1/4 Sd. The 1:3 flare rate is appropriate for most sub-bass use. Remember that the tapped horn is a narrow bandwidth device; it begins to sound strange in the upper midbass. The best drivers for tapped horns, as noted by Tom Danley, are more similar to the drivers used in car subwoofers - high mass cones with large, high-strength motors and low-to-mid Qts, on long-excursion suspensions.

[Taterworks]

Re: First try at a simple tapped horn in hresp/akabak

My tapped horn experiments in Hornresp usually start out with a 1:3 expansion, with S0 (narrow end cross section area) being equal to 1/2 Sd (piston area of driver), and SL (mouth cross section area) being 3 times that. From there, you can vary the length of the horn, S0, and SL to modify the behavior of the horn to suit the particular driver. You don't want a throat that is less than 1/4 Sd. The 1:3 flare rate is appropriate for most sub-bass use. Remember that the tapped horn is a narrow bandwidth device -- it begins to sound strange in the upper midbass.

[Sidi]

Re: First try at a simple tapped horn in hresp/akabak

The best drivers for tapped horns, as noted by Tom Danley, are more similar to the drivers used in car subwoofers - high mass cones with large, high-strength motors and low-to-mid Qts, on long-excursion suspensions.

What a coincidence, that is exactly what this is. :D