Ok, I think I'm ready to start my thread now. Don't have the woofers ordered yet, and that's partly because I'm now trying to decide between two designs.
As the title suggests, I'm trying my hand at a horn. But not just any horn - my brain wanted to jump right into the deep end. I have two tapped horn designs I've come up with, and I want to see which one's more worthy of my time and money. Not to mention see if I got any of this stuff right
For want of a better name I'm calling them Wolfhorn I and Wolfhorn II. The build itself is planned for spring/summer 2010... I can't do it in winter due to health issues, and that gives me time to iron the wrinkles out and fold the horns.
Some details - WH I is a 20Hz horn and uses the Tang Band 6x9" W69-1042M. These things can be found on eBay for cheaper than dirt right now, and are the reason I wanted to take a stab at tapped horns. They modeled surprisingly well in a TH, and with the price so cheap why not give it a try. As an alternate driver, the W8-1747 and W8-1747A appear to work as well, and get louder, but the response isn't as smooth. Haven't checked on the compression ratio for them yet. W69-1042J does not work, however. The general idea is that I would be building two of these designs, each housing two woofers. The design is about 420L as it is right now. Each one can exceed reference, so I'm not going nuts over getting that magical 120dB at 20Hz number in eighth space I was so obsessed over last night.
Now, Wolfhorn II is much the same as I, only with a 16Hz corner, a 600L design, and two much bigger Tang Band woofers - the 8x12" W8Q-1071F. This one gets MUCH louder than Wolfhorn I. The problem is, I'm still so new to this I don't 100% know if the design will work. It models well, as pictured below. Risk factor to the wallet is high as these woofers would need to be bought from Solen for about $104 Canadian each. I would only be building one of these. I may try it anyway, and just do Wolfhorn I in the meantime for practice.
Attached is a zip file of both designs. Any advice about the design is most welcome, if you spot something I need to address.
These shots are all modeled eighth space. That's how these would be run in my room. The room in question tends to fall off a cliff below 22Hz if the LLT is any indication, so keep that in mind.
These are with as much power in as the woofers can take without bottoming out. II might need some active EQ to pull down that big peak around 60Hz. Not sure about the compression ratio on WH2... is 3.12:1 possibly too much for those woofers
? I get 2.66:1 if I up S1 to 300, which adds another 20L to the size, but maybe that's the way to go there. 123dB in eighth space at 15.5Hz... that's going to get me committed to an asylum if I run it full out in here.
Edit - I'm adding the Sketchup plans and Hornresp sim for the final built version of Wolfhorn II to this post.
Wolfhorn 2.zip 24.0263671875k . file