Wolfhorn SDX Design Finished - Page 4 - AVS Forum
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post #91 of 351 Old 12-31-2010, 10:00 AM
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Lookin good, i would love to have the sketchup file when you are ready to send it out.
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post #92 of 351 Old 12-31-2010, 07:25 PM
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Quote:
Originally Posted by soho54 View Post

The idea is the get the resistance, and reactance to cancel out at the cut off.

OK, but........... and here is where I let it hang since from my experiments with what I believe is an ideal BLH, there seems only one way to get it in a TH alignment, though as we both proved in a sim, one can get a certain amount of it via misalignment.

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post #93 of 351 Old 12-31-2010, 08:33 PM
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Originally Posted by soho54 View Post

So at what point is it not reactance annullance anymore? I would really like to nail this down. If possible.

For me it's the same as for a FLH, high damping at Fc, i.e. max acoustic power (SPL)/watt. Don't have a clue how far off center is required to negate it in a TH alignment, but it doesn't take much to over/under-damp a FLH, so it seems reasonable to me that in a TH it's pretty much all or nothing since it's the horn's pulses doing the damping same as a BLH.

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post #94 of 351 Old 01-03-2011, 12:42 PM - Thread Starter
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Cutlist is ready. This build requires just under three 4x8 sheets of 3/4" plywood. Much better than my last design, which got well into a 4th sheet. The jury's out on whether or not I'll be using Arauco instead of the usual 11 ply shop birch... it all depends on what the prices are like on wood buying day. If the prices haven't changed much, I'll probably be looking at about $120 for wood. From there, all I'd need is 2 big tubes of PL Premium, lots of screws, and some 1" dowels to brace the throat segment with. The rest of the horn will not be braced... the width is narrow enough and the 3/4" plywood is stiff enough that I may not need it.

There is one panel I have to install in sections again to prevent the need for a 4th sheet of ply. Going to do that the same way as I did with the last project, only this time the panel needing the extension will not be the one right in the throat. I may not be leaving the metal brackets I use to hold the extension in place while the PL dries inside the box this time.

Ordering the drivers in 3... 2... 1... now
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post #95 of 351 Old 01-03-2011, 01:29 PM
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Very exciting OW. keep us up to date on the build!
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post #96 of 351 Old 01-03-2011, 02:04 PM
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Pardon me Sir but your BL figure is off a tad, double click the BL field and enter the info that HR asks for, you'll get 11.56.

Regards,
Dan
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post #97 of 351 Old 01-03-2011, 02:42 PM - Thread Starter
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Ah, so it is... thanks. Doesn't seem to make a lot of difference to the design though, to my profound relief. I can leave it be.
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post #98 of 351 Old 01-06-2011, 06:06 PM
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Holy cow, I haven't checked this thread in a long time. This looks amazing!
I'm not sure why folks aren't (edited) jumping up and down over this?

"The boom is dead, long live the bass"
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post #99 of 351 Old 01-06-2011, 06:10 PM
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Quote:
Originally Posted by CZ Eddie View Post

I'm still keeping an eye out for the perfect horn sub that would fit between wall studs and be about 90+ tall so I could drywall around it, leaving only a small portion sticking out.

I'd want two of them. One for the front and rear of my room. And capable of being nearly flat to 15hz.

But it would have to beat my pair of 15" 16hz tuned Tempest X for output. And that seems to be the tricky part.

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cz, how deep?

Just saw this. At the time I was thinking 12" deep maybe? Typical wall studs are about 3.5" deep, leaving about 8.5" or so sticking out of the walls. Might not be worth all that trouble just to save 3.5" though?

"The boom is dead, long live the bass"
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post #100 of 351 Old 01-06-2011, 09:55 PM - Thread Starter
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Quote:
Originally Posted by CZ Eddie View Post

I'm not sure why folks are jumping up and down over this?

Are or aren't?

Spent all evening trying to come up with a multiple taper design I wanted to try folding. Didn't work out too well - too much obsessing over the reactance annulling. I can get it to look better than the latest single taper revision I posted, but trying to get the reactance spikes as far down as possible while getting the impedance spikes to line up and match them drove me nuts.

I better just leave version 3K alone, I think. I'm just not able to do any better at this point in time with these woofers. Beats my last horn by a mile - I suppose that's good enough.
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post #101 of 351 Old 01-07-2011, 04:46 AM
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Sorry, "aren't" is what I meant. I fixed it.
I compared your Wolfhorn with the TH-Spud last night in Hornresp and yours is way flatter and extends further. Your enclosure design is taller and deeper but the SPL also rocks pretty hard. More than two TH-Spuds put together?

So many subs, so little time. This one has officially made it onto my short list though!

"The boom is dead, long live the bass"
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post #102 of 351 Old 01-07-2011, 05:39 AM - Thread Starter
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Now that you mention it, it is shallow enough to peek through 16" O.C. wall studs. There's some flexibility with mouth placement as well - you could put it on the bottom panel instead of where I have it without issues as long as it's at the end of the horn and the same area.

Don't want to speculate too much on how much like a SPUD it might be. Don't have one to compare with. It's not quite as smooth a response as it could be if I had weeks to cook up a good multiple taper design. But the woofers are more capable than the 8's used in the SPUD so I'm using that extra displacement to drop the corner to 16Hz without losing SPL.

If this horn is anything like my last one, it won't stop at 16Hz either. I hope to get reference down to 14Hz in room with this thing. My TB horn already does 14... just not that loud.
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post #103 of 351 Old 01-07-2011, 01:43 PM - Thread Starter
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Drivers have arrived. First impressions... I picked the right tools for the job. These things are seriously beefy... much more so than the Tang Band woofers I used last time. Diaphragms are nice and strong - the compression ratio of the horn should be no problem at all for them. At any rate, they're in one piece and the DMM says the coils are just fine. I'm good to go when the warm weather gets here. I'll break them in sometime between now and then when I get a chance.

Here's a picture of them on top of the Tang Band horn:



And one posed inside the TB horn to give some idea how the SDX compares to the W8Q-1071F:

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post #104 of 351 Old 01-07-2011, 03:13 PM
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post #105 of 351 Old 01-07-2011, 03:36 PM - Thread Starter
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I'd say it's more of a "first couple of warm days I get" project. Now that the woofers are here I just want to build it and hear how it does
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post #106 of 351 Old 01-07-2011, 03:51 PM
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nice lookin drivers
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post #107 of 351 Old 01-07-2011, 03:53 PM
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Defo looking forward to seeing the results on this one.
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post #108 of 351 Old 02-11-2011, 11:19 AM
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Any updates?

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post #109 of 351 Old 02-11-2011, 11:40 AM - Thread Starter
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Nothing yet. Still winter out there, though it's supposed to be above freezing for a few days. It's going to take a while yet to get rid of all this:



Will get the drivers broken in next week if I can remember to do it.
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post #110 of 351 Old 02-11-2011, 12:13 PM
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Tell me about!
8 degrees on the way to work this morning. Ugh! I despise winter!

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post #111 of 351 Old 02-13-2011, 05:33 PM - Thread Starter
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And now, I present a video of the driver break-in in a lame and futile attempt to make it look like there's actual progress being made:



Still a huge pile of snow out there, even though we've been above freezing for 3 days now. The warm spell is going to last a couple more days and then apparently Mother Nature thinks we need more snow and cold again
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post #112 of 351 Old 03-16-2011, 09:15 AM
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Snow melted yet?
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post #113 of 351 Old 03-16-2011, 10:25 AM
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Quote:
Originally Posted by PrimeMover View Post

Snow melted yet?

Stupid celcius... WTH is 2 C?



Central Texas is forecast for 80's/60's F the rest of the week.
LL

"The boom is dead, long live the bass"
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post #114 of 351 Old 03-16-2011, 04:00 PM
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I know you got your speakers but I was just wondering if you ever considered the Tympany LAT for a TH.
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post #115 of 351 Old 03-16-2011, 04:29 PM
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Our snow is gone. Good riddance!!
Ugh.

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post #116 of 351 Old 03-16-2011, 05:51 PM - Thread Starter
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Quote:
Originally Posted by PrimeMover View Post
Snow melted yet?
Nope - there was a ton of it to melt, and it's not leaving fast.

Quote:
Originally Posted by CZ Eddie View Post
Stupid celcius... WTH is 2 C?
35.6 Fahrenheit.

Quote:
Originally Posted by gibroni View Post
I know you got your speakers but I was just wondering if you ever considered the Tympany LAT for a TH.
Right up until I saw the price. Not worth the trouble.

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Our snow is gone. Good riddance!!
Ugh.
Lucky you
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post #117 of 351 Old 03-17-2011, 03:19 PM
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Quote:
Originally Posted by jpmst3 View Post

Our snow is gone. Good riddance!!
Ugh.

Quote:
Originally Posted by Oklahoma Wolf View Post

Lucky you

Yea, some of us had black ice this morning - not fun when the road tilts down 20 degrees at the end of your driveway

Chris

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--Despair, Inc. "Regret"

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post #118 of 351 Old 05-14-2011, 07:03 PM - Thread Starter
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It's on.



Once again, I went with C2 grade shop birch from Windsor. 11 ply, as good as it ever was. You couldn't beat the price with a bat even before they put it on sale for the month of May. $30 a sheet means all my wood cost me $95.

So far, I'm in this project about $320 for drivers, $95 for wood, $12 for screws, and $20 for two gigantic tubes of PL Premium. I get $447 when I do the math.

Of course, I did have to drop $60 into the gas tank to go get the wood from Medicine Hat...
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post #119 of 351 Old 05-14-2011, 07:06 PM
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Hey OW, nice to see you on another website... You on overclockers.com? I have the same user name on there too
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post #120 of 351 Old 05-14-2011, 07:09 PM - Thread Starter
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Yes I am. Either that, or it's my evil twin. We share the same body and imaginary friends.
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