A different type of "TH"?

[Brian Steele]

Please critique this design....

[BP1Fanatic]

TRIO8 "Unhorn" Proof Of Concept - Home Theater Forum and Systems - HomeTheaterShack.com

[Brian Steele]

Originally Posted by BP1Fanatic

TRIO8 "Unhorn" Proof Of Concept - Home Theater Forum and Systems - HomeTheaterShack.com

My own is quite different - check the displacement graph.

[jbell]

Originally Posted by Brian Steele

My own is quite different - check the displacement graph.

how many dog food cans?

[Brian Steele]

Originally Posted by jbell

how many dog food cans?

LOL! None at all this time . I was messing around in HornResp and decided to try out a few designs based around 1/2 wavelength, rather than 1/4 wavelength. This is one of the designs that popped out. Box size increases a little, but cross-section requirement does go down a bit and there's more excursion control below the passband (it might even be possible to run this without a HP filter, considering that the excursion is reduced all the way down to just above 20 Hz). Out of band noise above the passband is also reduced (and is likely going to be further reduced by the folding required to get this alignment into a box). End result seems to be a passband of 42 Hz to over 120 Hz, and 5dB of gain in the passband...

Of course this is all theoretical for the moment.

[jbell]

I've simmed several 'bow tie' TH's, but never built one...

Let me know if you make saw dust on this.

[Brian Steele]

Originally Posted by jbell

I've simmed several 'bow tie' TH's, but never built one...

Let me know if you make saw dust on this.

If I do, it won't be for awhile. Medical issues have curtailed my sawdust-making activities for the moment.

[Patrick Bateman]

Originally Posted by Brian Steele

If I do, it won't be for awhile. Medical issues have curtailed my sawdust-making activities for the moment.

I might have to build one of these!

I do a lot of car audio, and have always faced a conundrum with horns. Tapped horns offer smooth output, but suffer from too much upper bass in the car. The problem is that you want the response to fall verrrrrrrrry slowly in the car, to complement cabin gain.

So the flat smooth response that you get with a TH is great for the house, but a little iffy for the car. (Of course you can just EQ it in the car, and that's exactly what I do.)

Front loaded horns work nicely in the car. But the problem that you run into with FLHs is power handling. Unless you drive a van, a single eight is about the biggest you're going to squeeze into the car. Fitzmaurice's autotuba is a good example. If you try to use a ten or a twelve, box size just gets nuts in a hurry. And if you opt to undersize the horn, you might as well just build a bandpass box because the response of a FLH gets really peaky as you undersize it.

So your "bowtie tapped horn" is a really nice option. It sacrifices the low frequency output of a conventional TH, but again, that can be a *good* thing once you factor in cabin gain. And the excursion reduction will certainly keep a lot of woofers from exploding.

I've attached a quick schematic using the Soundsplinter RLI-P8. Once graph is a TH-Mini style layout, and the other one uses your "bowtie" layout.

[bjorno]

Originally Posted by Brian Steele

Please critique this design....

FYI,One more picture to look at...

b

[Brian Steele]

Originally Posted by bjorno

FYI,One more picture to look at...

b

Thanks. What's "BS-TH2P" and "BS-TH2M" representing? I think I can make out the others - looks like you've simmed the response with a 20 Hz to 120 Hz active bandpass filter. What's your view on the projected results?