Originally Posted by cubdenno
Will probably get yelled at, since I am not searching, but why is to much motor force a bad thing in a horn.
I ask because I was wanting to try my hand at building one of these.
I have a TC buyout 15 with a TC9 motor that I was thinking about trying just because I have it. It was an OEM for a HT sub with a matching passive. No other info. I need to test it for the T/S parameters.
I didn't say "any tapped horn", I said "this tapped horn".
Now, keep in mind that I'm only a hobbyist when it comes to tapped horn design. I have had no formal training in acoustics or anything like that. My design decisions and processes are purely based on my own experience and empirical results.
For me, designing a tapped horn is a balancing act. The amount of motor force, the driver's cone area, and the area and rate of expansion of the horn all must be balanced appropriately for things to work out according to the model.
All else being equal, in simulation-land, the larger motored drivers (higher BL) tend to want a smaller horn at the throat end in order to achieve a reasonably flat response. That's great, except that in actual use, the driver diameter sets the minimum width of the horn, we're not dealing with a circular section. So, as a result, the aspect ratio of the rectangular horn section increases and the smaller horn has a higher amount of surface area relative to the horn area, which may increase the losses in the horn. Of course - you've also got to make the horn large enough at the mouth end to fit the driver inside.
Certainly - there is more to this than I have the time or desire to go into at the moment.
I've built some tapped horns that were too small, the results weren't pretty.