Could be, but I guess need we to know MJK's math and be able to understand it to know for sure.
Anyway, all I need to know are the TL that you outlined plus pipe end correction and vent design basics to design successful [ML] speaker/horn cabs.
Hmm, the different end corrections due to differing tapers will impact both the fundamental and pipe harmonics, so maybe this is the 'missing link' you seek.
GM
Rats my computer is a Mac and hornresp seems to be a windows application. Might borrow the wife's. But I think it will supply numbers/graphs rather than reasons.
End correction is a thought, but the difference between the 10:1 and 1:10 tapers makes the length more than double for the same fundamental, which is a very big difference. My reason for thinking about mass loading was wondering if an expanding line is a sort of "negative" mass loading, and a diminishing line is a positive.
Thank you all for your responses.
End correction is a thought, but the difference between the 10:1 and 1:10 tapers makes the length more than double for the same fundamental, which is a very big difference. My reason for thinking about mass loading was wondering if an expanding line is a sort of "negative" mass loading, and a diminishing line is a positive.
Thank you all for your responses.
You all make me very confused.
A conical horns radius increases as radius_at_throat * ( 1 + some_constant * distance_from_throat). I.e. the sides are straight lines.
Which means that from some distance from the throat the horn area will start to expand according to distance_from_throat ^ 2 (squared).
For small distances from the throat or small expansion rate we can use that (1 + d)^2 is approximately equal to 1 + 2d if d << 1 (much smaller than 1).
I can't tell You when the approximation is valid for a horn. Plug in Your numbers and see what You get.
A conical horns radius increases as radius_at_throat * ( 1 + some_constant * distance_from_throat). I.e. the sides are straight lines.
Which means that from some distance from the throat the horn area will start to expand according to distance_from_throat ^ 2 (squared).
For small distances from the throat or small expansion rate we can use that (1 + d)^2 is approximately equal to 1 + 2d if d << 1 (much smaller than 1).
I can't tell You when the approximation is valid for a horn. Plug in Your numbers and see what You get.
Right, you have use one of those Windoze emulator programs.
Well, my simpleminded way of understanding it is that the 10:1 is exerting 'x' amount of acoustic pressure under compression at the terminus and a 1:10 has to have a longer expansion to build it up to the same acoustic pressure plus the end correction of the horn is much greater than the TQWT, making for more harmonic structure offset.
You're welcome!
GM
They aren’t emulators, they are virtual machines. Sun’s is free but you still need a copy of Windows to install in it. WINE is free and runs without Windows, and i think HornResp is well enuff behaved to run it it. HornResp does’t take damping into consideration which makes it hard to interpret. Leonard’s TL sim is better in that respect.
dave
Ok, thanks, thought I saw them called emulators a long time ago when options first became available. Anyway, just know that some folks run HR on Macs. Best to browse, search, ask details here: http://www.diyaudio.com/forums/subwoofers/119854-hornresp.html
HR now has mostly good enough filling options, just don't know how to interpret his specs to fiberglass, etc., except by measured results plus has XOs and more new features than I can keep up with.
GM
HR now has mostly good enough filling options, just don't know how to interpret his specs to fiberglass, etc., except by measured results plus has XOs and more new features than I can keep up with.
GM
In thoe days they were emulatora as the Intel machine language had to be emulated under 680xx or PowerPC. Since the change to Intel processors it just takes a virtual machine. Macs can also run Windows stand alone, but — from experience — it is a pain to have to reboot to go from one to the other.
It is ironic that often the easiest way to use MS-DOS is under one of the virtualizers on a Mac.
dave
Thanx. One of those myriad updates GM mentioned.
What does a response simulation look like? I’ve yet to see one that looks like damping has been considered.
dave
What does a response simulation look like? I’ve yet to see one that looks like damping has been considered.
dave
Simple example:
Attachment 1 - No damping (Hornresp calls this an offset driver horn).
Attachment 2 - Same system, but with some damping added (Hornresp calls this a transmission line).
See also:
http://www.diyaudio.com/forums/mult...ty-without-waveguides-dsp-12.html#post5128263
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