Project Wolfhorn - Page 6

Yeah... I prefer to just cook up one to handle everything if I can.

Go into their owner's manual download area - they have a downloadable PDF with all the specs in it. There also should be a tab on the product page with the basic parameters listed.

These woofers like a high compression ratio... fortunately, the cones from afar look to be sturdy enough to handle it.

The horn would probably have to be redesigned... it's designed with two drivers in mind, and removing one would change it completely, and for the worse. I'd say you could cut it in half, but the woofers are too wide for that.

I've attached the best I can do on short notice for a single one of these Tang Band woofers at 16Hz. It won't do 115dB, but the design volume is down to 275 liters or so. The most it will take is 80W before exceeding Xmax, and it hits 107dB at 20Hz and 104dB at 16Hz at that level.

Given the still large size and the low SPL capability, it's probably not worth doing. In singles, these woofers are happier staying around 20Hz.

 

wh2sd.txt 0.3974609375k . file

Wait... four of those and you want more?

His Shiva horn is pretty close in SPL to my double TB horn... it takes both of these TB woofers to match it.

I don't really have anything in my Hornresp database that significantly beats the SPL from this TB horn that still looks do-able. I'm working on a redesign of this one using the SDX 10," and that one will be about 520 liters, but still will only do 115dB in half space before Xmax (this one does 110 in half space). I just don't need anything more capable than that, so I haven't really concentrated on any monster SPL designs. As long as I get an efficiency boost on the low end over a vented box, I'm pretty much happy.

That said, I have gotten terrific simulations from two DIYMA R12 woofers. They will just about drop into this TB horn and push 130dB in a corner with the addition of a segment on the end of the horn to lower the corner to 14Hz. Problem is, they aren't being made anymore.

Ah... that makes more sense. I can't imagine not being happy with the output of four of the Shiva horns.

The SDX 10 redesign of the TB horn will be 12" deep at most if I can get away with it. It'll still be big, but not as scary to actually build. It becomes a real brute if I let the size go up to 850L, but I'm choosing to sacrifice some sensitivity for size as long as I get my 115 in half space. One reason for making it so thin is that I don't want to mess with bracing again except for the throat. Will probably use the same 3/4" shop birch, so it should be plenty solid on its own.

It'll take me about a year to get to that project though. There's no more money in the subwoofer budget this year.

I'll have to post some graphs once I get back home. The box design is the same as the one I built for the TB horn, only with a segment added to the mouth that has no flare. Comes out to be over seven feet long with the addition of that segment. 735 liters before materials.

That there is the question. Compression ratio is the same as my horn - 3.25:1. A redesign may be needed.

Patrick Bateman over at DIYAudio has recently done a tapped horn with these... if anybody would know what's safe for these woofers, it would be him.

Ok - here's what the horn looks like with the DIYMA woofers and the mouth extension. This is about as accurate as I can model it. Impulse response is worse due to kludging new woofers into this design, but everything else looks great.

When given 900W at 2 ohms, these woofers are just outside Xmax but still well inside Xmech. This gives you 120dB over much of the passband in half space. Eighth space graph shows over 130dB, but I would realistically only expect about 125-127dB from corner loading.

Compression ratio is 3.32:1, design volume is 747L. 14.5Hz corner. With an aluminum cone, they might be ok.











Edit - had to re-do the images due to an error - you may have to refresh a couple times to get the corrected ones, if you saw this right after I posted. This time, I set it up with the 900W input.

 

wh2diyma.txt 0.4052734375k . file

If you go ahead and build these, you gotta promise me I can come hear them the next time I visit Kansas to see relatives

You're going to need a lot of plywood. Probably about four sheets per box.

Feel free to play with the woofer in Hornresp - this is just what I would do if I had those woofers lying around since I already have the horn built. All I'd need to do is tack on that mouth extension to the mouth end of the horn.

Sneak them into the garage behind a new van


Quick impressions - better than the Rockfords, but not much advantage over the CSS SDX10. I can get the size down to about 510 liters vs. 523, but the extra cost of the TC woofers negates the small space advantage. I'd love to play with them, but there isn't a good enough reason right now for me to pay the extra.

What I'd really like to find is a woofer like this that's at least 88dB sensitive, like my Tang Band woofers, or better.

Yeah... I just wish I could get them for cheaper

The Axis 12" works very well also.

Vas is a bit on the high side, Fs is on the low side. Probably not that good of a TH woofer

I should quit worrying about driver sensitivity and just concentrate on designing the next TH to boost that sensitivity as much as possible. That's where the Epic 10 seems to have the advantage over the SDX 10... because it likes a smaller throat and higher compression ratio, I can give the horn better sensitivity in the same size design. If I can get it to 92-93 dB, it'll match up better to my Tang Band horn.

I have several months yet before I can afford to do this again... who knows, by that time I may well have talked myself into working with the Epics anyway

Soup's on!



Receiver is at -10dB, and the LFE is calibrated 5dB hot. 120dB peaks, and the horn still has more to give. Not only was this Flight of the Phoenix, but I got the woofers on video during the barrel roll scene

This video looked so much better before I had to compress it so it would upload in under an hour. Upload bandwidth both sucks and blows here.

The sound quality was garbage before I compressed the file - that camera only records 8 bit mono. I had to convert it to a better audio stream just to compress it. And of course, 126db+ at the mouth just overwhelms the microphone in it.

Picture quality was a little better before compressing, but the file size was just too large to upload quickly. As it was, a 20MB file took about 40 minutes. The original file would have been hours.

Edit - I just found out five minutes ago this DVD has a DTS soundtrack. How sad is that? I've had this DVD for months. Did the whole demo with Dolby Digital.