I think I've done enough fiddling and tweaking of this design that I'm ready to get some external opinions on it now. I'm nowhere near the building point yet (wish I could afford it), but I thought it would be good to get any bugs I missed squashed in advance. Also, since I'm primarily doing this for people who would otherwise be interested in building my Tang Band horn if only it weren't the size of a house, I'm wondering if I got the size down enough for those folks.
Goals for this design:
- tapped horn
- must do Dolby reference in half space to 15Hz
- must do the above with less than 300 watts
- must be way smaller than Wolfhorn II - plywood costs money
- drivers must be affordable for a poor Canadian like me
- total project cost must stay around $500 minus the amp
I think I've gotten the best compromise out of this design now, but I'd like some second opinions. If modeling is any indication, and my experience in putting one together is any indication, this thing should be a beast. It should be able to hit reference at 15Hz with less than 150W at 8 ohms. Corner loading should get it into the mid 120dB's without problems. Driver displacement in the passband with the full 360W output of one channel of my QSC amp is only 20mm - should be safe for these woofers (CSS SDX 10").
Now, don't quote me on this because I'm still learning... with these woofers, there is a strong possibility this will still have a fair bit of output below 15Hz. 15 should be easy - Wolfhorn II has a lower corner in room than modeled. I'm counting on that again with this design. 13-14 may be possible at reference, but the drivers may be getting into trouble by 13 and I have no idea where the THD will start causing problems yet.
Finally, I have another revision of this design because I wasn't happy with the 1W/1M sensitivity. It adds 2dB from about 17-40Hz or so. However, this one is bigger at 570L due to more horn flare and rolls off faster. I'm leaning for the 517L version I'm posting here, because it meets all my goals already, but if there is any interest I'll toss up the other one for comparison. And let's face it - 517 liters internally is still a pretty big design, even if it is 135 liters smaller than Wolfhorn II.
I can get this design down even smaller with even more output if I raise the corner a bit, but to be honest I have no interest in raising the corner. This was supposed to do everything the TB horn does (and then some) in a smaller package. Can't do that if it only plays to 18Hz
Anyhow, if this thing sounds good to you guys, I'll go ahead and start trying to fold it. If not, there's a good six months of time before I can get something built with which to make improvements.
Hornresp record attached - screenshots to follow in my next post.
Edit - now that this project is done, I'm now adding the plans to this post. The original simulation which was in this post is now invalid, so I'm replacing it with the final product's simulation.
There are some alternate drivers that should work based on published TS parameters. Note that these have not been measured or verified by yours truly. Try these drivers at your own risk. Some work better than others. In order of most to least compatible based on motor strength and general suitability:
- TC Sounds Epic 10
- SEAS L26ROY
- Dayton TIT280C-4
- Fi X10
- Funkin Audio SL-250
- HiVi SP10
- ACI SV10
SDX 3L.zip 221k .zip file
sdxr3lr2.txt 0.408203125k . file
Edited by Oklahoma Wolf - 2/18/13 at 7:40pm