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75.109.11.25
Version 15 HORNRESP
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nt
The capability was always there, all that differs is the instructions that outline how to do it.
Hi Bill,
Just for the record, Hornresp could not really model tapped horns accurately prior to Version 15.00 :-).
The tapped horn simulation engine now in Hornresp is completely new, and the result of considerable effort on my part in recent times - it meant some very late nights, or should I say early mornings! It is purpose-built to specifically analyse volume velocities in the tapped horn lumped-parameter acoustical equivalent circuit.
While it might be possible to achieve reasonable indicative results using earlier versions of Hornresp, the model in the latest release is far superior theoretically, and should give more accurate predictions of performance.
Accordingly, I would strongly recommend that only Version 15.00 (or later) be used for tapped horn simulation work.
Regards,
David
I tried using the tapped function, got the prompt asking if for tapped horn function, but I could not find where the values for the remaining three L values get entered. I can understand the alteration to the program, especially the L value for the horn closed end to the diaphraghm. I got around the lack of same previously by calculating that space as a front chamber to account for its resonance. While the length wouldn't be accounted for in terms of phase the quarter and half wavelength distances would be far too short to be of concern within a subwoofer passband. In any event, how does one enter the other three L values? Thanks.
Hi Bill,
The fact that you saw the tapped horn prompt means that you had already done everything that you needed to. In specifying the three segments you automatically provided the program with the L values it requires. L12, L23 and L34 are simply the lengths of the three segments. After calculating the tapped horn result, if you move the mouse pointer over the schematic diagram you will see descriptions of the various components making up the system.
Incidentally, I have just released Version 16.00. I was able to use the knowledge gained in developing the tapped horn model to improve the existing Combined Response tool.
Kind regards,
David
Understood, it's as clear as gin when explained that way. But the instructions in the Help file aren't nearly as illuminating. I wondered why they specified three segments, never made the connection. Thanks.
Hi David
regarding use of the new Tapped Horn model, might you explain how this is properly entered/"done" in Hornresp 15's input window? also, does the new engine improve other predictions?
Best,
Freddy
ps - my klam vid might only be around 1MB (?) :^)
Hi Freddy,
Have a look at Note 7 on page 15 of the Hornresp Help file - if the information there is not sufficient for your purposes please let me know which bit doesn't make sense, and I will try to improve the description. The new tapped horn engine does not change the predictions for other system types.
...I will give the klam video another try :-).
Kind regards,
David
You might not have optimized the earlier versions for TH, but when the TH came out and I surmised via the pics and impedance charts what it was I used the version available at the time to confirm my hypothesis, and it did so very well.
will it also do your "Omni"?
Not unless David has made a change since the last version, which doesn't seem to deal well with reflex/horn combinations, as it predicts a massive phase notch at fb.
be nice to have that ability - - I've not used hornresp for a long time and when piddling with it today failed to open up the tapped horn option
when did you first do the "omni" type? - I remember a triangular half-horn of yours in Speaker Builder whose rear wave fired into a folding stand and front wave into a waveguide kinda like omni
Doing a tapped horn you just do a backhorn and leave both the front and rear chamber values at zero. It can get cranky about the number and type of segments, though, so follow the instructions. My Omni cabs are straighthorn/reflex cabs, nothing unusual there, though the O10, 12 and 15 vent the port into the horn, and that's very much a seat of the pants design process. The OmniTop 12 and 15 are more conventional, the ports vent direct. I intially modeled those using HornResp for the horn section, WinISD for the reflex, combining the two, though the final port sizes were determined by testing with completed cabs.
Hi Bill
I have not used McBeans thing yet but would comment that while one can find horn and driver parameters that work that way (rear driven horn with direct radiating on one side as described), the more useful and powerful alignments, evident in all the Tapped horns is that all have a horn section after the drivers second connection.
It is important (in the Tapped horn) that the two faces of the radiator be appropriately coupled to the one acoustic path to get the most out of the system, the idea is one then has a variable source impedance to compensate the horns variable load down low, hence a significant reduction in ripple and cone motion for a given size horn and cutoff.
This is not present in the rear loaded back horn at least to any significant degree like a proper T.H.
Best,
Tom
I haven't used it either, so no comment on its accuracy, but no reason to think it wouldn't work well. As to the rest, obviously one can't just toss some numbers into the program and come up with a box design, as the topology is just as important as the numbers.
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