Ich zitiere mal meinen englischsprachigen Post aus einem anderen Forum:
Ok guys, im a little late on this, but anyways, lets start with simple BR or BP simulations:
(please ignore my lacking english skills)
If you look at the first picture i posted, you will notice the hornresp input screen is divided into 4 segments. For Bassreflex and Bandpasses with straight ports, you can ignore the green "Horn segments" part. We will get back to it later.
So first thing to set is where our cab will be placed. Double click on the "Ang" field in the top left hand corner. If we design a bass cabinet standing on the floor, like it would be in open air situations, we enter "2pi" (halfspace). If your not familiar with this yet, please search the net, as this is very basic knowledge allways needed.
Second thing to enter is the input voltage "Eg". I would recommend starting with 1w simulations, so you double klick the field and enter 1w and the nominal impedance of your chosen chassis. Hornresp will calculate the coresponding voltage.
Now, jump to the blue "Chassis TSP" area.
Open you chassis datasheet and enter the cone area "Sd" in cm².
Go from left to right and allways double click the next field and enter the data hornresp is asking for. The "Re" field is not to be double clicked as you will find it in the datasheet, just enter this value.
Please note: hornresp works in the metric system, so any values will be either cm², cm³ or liters. if you enter data in inches or anything, results will be wrong! Also, use "," and not "." for commata.
Now continue with the next row from left to right. "Le" again wont be calculated, just enter the value found in the datasheet.
Now you get to the "Nd" field. You can double click the field aswell as the "Nd" itself. For our basic systems (BR, BP, FLH, BLH) we will leave "Nd" as it is. Later, you will find things like "TH" or "TH1" here, to simulate tapped horns or multichamber arrangements. If you would like to simulate an enclosure with mutliple chassis, such as a 2x18" BR, you can now enter the number of chassis (2 for my example) in this field.
Note: I do not recommend doing this. I allways simulate single chassis enclosures and adjust the "Ang" value to mutliply this cabinet (I will show you how later). Both will give you exactly same results, but you cant divide a cab in half with this method, just multiply, so i allways start with one single chassis. But if you have the dimensions of a 2x18" enclosure measured out and are not fully sure which values will have to be divided and which not to simulate half of the cab, this is a the way to do it.
By the way, volumes and areas will allways be divided by the numer of chassis sharing them, lengths wont!
Before we continue with the interesting chamber arrangement, go to "file-> copy driver to database " and enter the name of this chassis. If you do a sim with the same chassis at a later point, you will not need to enter all the TSP again, just go to "file-> paste chassis from database". Pretty handy!
Ok now take a look at the second picture i posted. For bassreflex, you will find 4 values needed to specify the enclosure, "Vrc", "Lrc", "Lpt" and "Ap"(orange area).
In my first pic, i give a short explanation of what this values stand for. These will also be displayed at the bottom of the hornresp screen if you swipe over the values with your mouse.
In the screenshot you see from my input data, i simulated a simple BR enclosure with a backchamber of 140l, a depth of 50cm (Note: this value is only needed to calculate standing waves etc in the chamber. You dont need to be too exact here, a guess is allright for a start). The port area is 400cm² and its 35cm long. I would recommend to choose a port area about 1/3 to 1/2 of "Sd" at bass cabinets, if you make it much smaller, it will suffer from port noise, turbulence etc at high levels likely.
Note: The tuning frequency of a port will rise if a) you make the area bigger b) you decrease the length or c) you decrease the chamber volume and vice versa.
Hornresp allways simulates one single port. If you want to have multiple ports in your design later, you will have to divide the port area by the number of ports intended and make them all as long as "Lpt" is.
Also note that the location of the ports within the enclosure could make the port virtually longer. This will be siginficant when you place the ports in a corner or against a sidewall. In some of my designs, i had to shorten the port by as much as 25% at the prototype to compensate for this. What you learn here is that a prototype will allways be needed, no matter how accurate your hornresp sim is!
Ok, we are nearly done. Press the calculate button and look at the results. For starters, the acoustical power, diaphragm displacement and electrical impedance is the interesting data.
What they stand for exactly and what these results tell you will be discribed at another post. Just one thing in advance: To check if your chassis will take its full RMS or AES rating without exceeding Xmax, alter the "Eg" value on the input screen (double click, enter RMS rating....) , calculate again and look at the diaphragm displacement. Below the tuning frequency, the excursion will be very high, but this wont be an issue as you introduce a highpass filter (lowcut) to the system, which is obligatory with ported enclosures! Whats interesting is the excursion maximum at the octave above the tuning. This should not exceed the xmax of your chassis, if it does, you will have to reduce power below the RMS rating to prevent damage.
And now the most handy thing ever:
You will not need to change the chamber arragement over and over again and allways calculate and go back again to input screen to alter it.
Go to "tools-> loudspeaker wizard". Here you can see in real time how changing a certain parameter is affecting the dispersion, spl, impedance etc. of your system.
Please note: for ported enclosures acoustical power graph, the bottom right hand corner field must allways show the "combined response". If not, hornresp will only show the sound comming from the front of the cone OR the port, but not both combined, which is ofcourse what you would like to see.
Ok, i will leave it like this for a start and continue in another post.
[Externer Bildlink zu Audiofotos]
[Externer Bildlink zu Audiofotos]
). Gut, dann wird die Kiste wiederum größer, das wäre wohl nicht so sinnvoll, wenn beides in eine Box soll.
Klangart
![[Externer Bildlink zu Audiofotos]](http://www.audiofotos.eu/images-i4937blrn6r.jpg){kind=link}
![[Externer Bildlink zu Audiofotos]](http://www.audiofotos.eu/images-i4938brfqfb.jpg){kind=link}