Version Release 1. Operating Systems. Additional Requirements None. Total Downloads 5, Downloads Last Week Report Software. Related Software. Apple iBook Firmware Free. Firmware for hardware v7. So the modeled results should be fairly accurate up to the frequency where the horn starts to have directivity - where the polar pattern starts to narrow.
This is typically at the frequency where the wavelength falls below the diameter of the horn mouth. Above this frequency, Hornresp will predict lower SPL levels than what you would measure on-axis. Hornresp now includes tools to investigate this effect. Once you calculate the model, go to the SPL Response chart.
Under Tools, select Directivity. If you enter a blank input, you will see the power response. If you enter 0, you will see a prediction of the on-axis response. You can also enter other angles. Also under tools, you can look at the Pattern tool. This will predict the polar pattern at the frequency you input and show you the DI, directivity index at that frequency.
Directivity index is a number in dB giving the gain over what the level of the power response is. Tools are listed per Window. For simulating multiple driver subs like the Labhorn. Subs calculated these way for PA use aren't very functional in handling, size and weight and the name monsterhorn comes quickly in place.
The normal route for PA use is to design 4 or 6 cabs that in total will have the same moutharea and hornlength as one of these monsters. This way it does show that you need to have realistic demands when it comes to both SPL and low frequency response. With the use of the "compare"-function ahead you can easily reverse engineer this monsterhorn to a more usable size and weight. Find: Easy to find a record if you have too many already you'll , just select and close.
For example at Window 6 it will tell you the excursion the driver has to make at a specific frequency, so you can see what power your horn will handle. Does anybody know a way around this? You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum.
This page was generated in 0. Start Prev 1 2 Next End 1 2. I was sent this guide to Horn resp a long time ago, thought i would post it up for you guys to read Hornresp Kickstart Introduction The Hornresp program, written by David McBean and based on Olson's horn model, is a very easy to use horn simulation program. Some people call it a bass horn simulation program as it does not have enough input information to always simulate higher frequencies accurately, but the model is accurate for predicting power response at higher frequencies as well more on this later.
But if it's so easy, why write a guide? While it's easy to use, it has some abbreviations and terms which will remain a mystery to many, even after reading the built-in help file. Furthermore Hornresp's abilities keep growing steadily. Hence the reason for this guide. Entry guide ANG: Here you indicate where the horn is located. In a nutshell, enter 0. This full sphere is known as 4 Pi space. When placed on the ground, the sphere is cut in half and the ground forms an acoustic mirror which effectively doubles the size of the horn mouth compared to full space.
As a result you can make the mouth smaller when placed on the ground. This is called half space. When the horn is against another wall, the hemisphere is divided in half again, quarter space. Each time the radiation angle is cut in half, the required mouth size is halved, hence it is recommended to place the horn in a corner to reduce the necessary physical size of the horn.
In most cases, except very large PA, subs are ground stacked and thus are best simulated in half space. Tops are usually flown or placed upon standards or subs to get the high frequency drivers horn mouth above the crowd. This is accelerated by the horns increased directivity at higher frequencies they aren't strictly omni-directional any more and thus are less affected by boundary loading.
PA tops in general therefore should be simulated in full space. Note: Loading into half the previous space i. This tab will influence the SPL and cone excursion and enables you to get an indication of the maximum SPL performance based on the excursion limits of the driver. Hornresp has a calculator appearing upon double click in the tab that can "translate" the amount of Watts, on a specific load impedance , to the Voltage required in the tab.
For instance if you need Watts into a 8 Ohm load, Hornresp calculates The next values ought to give you a start: Cable from amplifier to speakers 10 meters long, 2. CIR: Free space normalised horn mouth circumference in flare cut off frequency wavelengths - CIR is only visible when either the last horn segment is Exponential or the first and only horn segment is either Exponential or Hyperbolic-exponential.
As you might know, Hornresp simulates the horn mouth, throat and segment area's as if those are circular. To give optimum efficiency at the cut off frequency of the horn, the circumference of the circular mouth area needs to be the same length as the wavelength, corresponding with that cut off frequency in 4.
You have achieved this when CIR is 1. In 1,0 Pi this mouth area can be made smaller again, etc. In most modern horn designs the actual mouth area is smaller than the optimum mouth area most often a compromise between gigantic size and actual performance needed. About the reasoning behind this you can find more information in the Speakerplans FAQ's and general horn theory found on the www. In short you can get away with a CIR smaller than 1.
See also the schematic diagram. S1: This is the area at the beginning of the horn or throat area , the end closest to the driver. It's ratio to the driver's area sets the compression ratio for normal horns.
Use a calculator and work it out in cm. I'll choose 50 cm wide x cm high which gives cm2. Now click on L12 - this is the length. We'll let hornresp calculate this based on F12 which is the number we'll input for our cut off - 40 Hz. We hope to get the horn to extend to this point. Select calculate and it works out the length.
Now click save and the new numbers are entered: Now click calculate to see the new results. Not quite as impressive as before but we have maintained the extension and efficiency except for a midbass dip and the volume is now around L. Let's simulate for corner loading.
Change Ang to 0. This compensates for 12 db of acoustic gain that inflates the efficiency.
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