My Dual Tang Band 8x12 Tapped Horn Project - Page 4 - Home Theater Forum and Systems - HomeTheaterShack.com

Reply
 
Thread Tools
post #31 of 99 Old 01-19-10, 01:05 PM
Elite Shackster
 
Ricci's Avatar
Josh
 
Join Date: May 2007
Location: Louisville, KY
Posts: 2,431
Re: My Dual Tang Band 8x12 Tapped Horn Project

Jacob,

You are right. I wasn't really intending to say that people should post 4pi graphs even though I did ask Jeremy to post one. I was just explaining why I use it. I have seen a lot of people lately posting 0.5pi or 1.0pi graphs and that was my main point. As you say it's very easy to make a mental 6 or 12db subtraction if you know what you are looking at. As mentioned a lot of people do not know the difference and they see 2 graphs and think that they are looking at apples/apples when they aren't at all. I think everyone is on the same page here...

BTW,

I may ask for your opinions on a design I'm piddling with in the future as your horn design chi is much stronger than mine.
Ricci is offline  
Sponsored Links
Advertisement
 
post #32 of 99 Old 01-19-10, 01:36 PM
Senior Shackster
 
Join Date: Jul 2006
Location: I ain't tellin ya!
Posts: 267
Re: My Dual Tang Band 8x12 Tapped Horn Project

Yeah, it really didn't fit here, but I thought it needed to be thrown out there somewhere. I know you have a good handle on it.

I don't know how much help I'll be to you, but send a PM.
soho54 is offline  
post #33 of 99 Old 01-20-10, 03:38 PM
Shackster
Michael
 
Join Date: Nov 2007
Location: UK
Posts: 59
Re: My Dual Tang Band 8x12 Tapped Horn Project

Anybody read this thread think.....wow 8 times 12 inch subs in a tapped horn my word the world is going to end with that awesome bass!

Oh well, still looking forward to hearing this.

A good friend of mine recently took a old 6.5 inch woofer from a high tuned computer "midwoofer" and we put it in a tapped horn and run a nice plate amp to it and we were utterly astounded with the output and frequnecy range!
micb is offline  
 
post #34 of 99 Old 01-20-10, 05:47 PM Thread Starter
Senior Shackster
Jeremy
 
Join Date: Dec 2009
Location: Eastend, SK, Canada
Posts: 333
Re: My Dual Tang Band 8x12 Tapped Horn Project

Wait until someone convinces me that Wolfhorn III is viable... some of the sims for the IXL 18.2.2 made my jaw drop. If I go ahead with that one, I may stop at 20Hz due to the sheer size of the cabinet needed to get the compression ratio to sane levels.

Right now I have that one at a 19Hz corner in half space showing low to mid 120dB output before it runs out of excursion. Compression ratio is 2.13:1 currently. 766L design so far. I'd post a graph but I'm not happy with the uneven SPL graph in it right now. Needs more work, and I'm still not sure I'll bother. It's easier doing these with smaller drivers

I should sim the 12" IXL now that he has two versions of it. Maybe the 10" too.

Last edited by Oklahoma Wolf; 01-20-10 at 05:53 PM.
Oklahoma Wolf is offline  
post #35 of 99 Old 01-21-10, 08:52 PM
Joe
 
Join Date: Jan 2008
Location: Virginia
Posts: 8
Re: My Dual Tang Band 8x12 Tapped Horn Project

Quote:
Oklahoma Wolf wrote: View Post
The Dayton DVC used in the Tuba HT might work in the Wolfhorn II design as well, but then I'd have no choice about making the box deeper. Another plus to the oval TB's. And the fifteen would be less tolerant of the compression ratio too.

Going back on topic, I think I'll compromise a little and increase depth to 15.5." That will allow room for bracing while still allowing for the thickness of the saw blade. I will be using some damping material around some of the folds to hopefully help with standing waves.

No expert here- just a thought.

Would mounting the Dayton DVC diagonally in the box like some of Siegfried Linkwitz’s dipole woofer designs help in any way?
HokieJoe is offline  
post #36 of 99 Old 01-21-10, 10:13 PM Thread Starter
Senior Shackster
Jeremy
 
Join Date: Dec 2009
Location: Eastend, SK, Canada
Posts: 333
Re: My Dual Tang Band 8x12 Tapped Horn Project

Nope, I modeled it and even if it did fit (actually, I think it will after all) the response isn't great with this design.

I keep going back and forth on the reflectors yet. I think I may add them after all - I'm sure they won't hurt. Unless the circular saw slips while I'm trying to do angle cuts, that is... maybe I'll just use the jigsaw for those.
Oklahoma Wolf is offline  
post #37 of 99 Old 01-22-10, 01:34 PM Thread Starter
Senior Shackster
Jeremy
 
Join Date: Dec 2009
Location: Eastend, SK, Canada
Posts: 333
Re: My Dual Tang Band 8x12 Tapped Horn Project

The woofers are here. One is defective - scratching noise as you push down on the cone

I tested them briefly with a 10Hz sine wave. The bad one sounds like a jackhammer. Will have video when I can get it uploaded.

Initial impressions - these are some serious looking woofers. Will have to use the QSC to do the break in, as my old 60W x2 Noresco amp got way too hot already just testing them.









Oklahoma Wolf is offline  
post #38 of 99 Old 01-22-10, 02:43 PM Thread Starter
Senior Shackster
Jeremy
 
Join Date: Dec 2009
Location: Eastend, SK, Canada
Posts: 333
Re: My Dual Tang Band 8x12 Tapped Horn Project

So I was sitting here thinking about waiting on a new driver when my brain said something to me and we had this conversation:

"Say, Wolfie, old buddy, you've been an electronics tech for a while now and have fixed everything from digital cameras to sentry key modules in minivans."
"Yeah, so? I paid for a new working woofer and shouldn't have to fix it."
"Well... see that there? You can see the voice coil and down into the gap easily on these woofers."
"Your point, brain?"
"I think I see something in there that doesn't belong poking its head out of the gap."
"Hmm... you're right. Hand me those dental picks there and I'll have a look."

So I carefully pushed the cone up until the coil left the gap and did some poking around with the dental picks I use for delicate de-soldering work. How do you get a sub to sound like a jackhammer? You toss metal filings into the gap, that's how:



The defective driver is now working silently. There are a few scratches on the enamel of the coil, so I'll have to strap these both to the QSC and see if they survive break-in. Just maybe I'll get away with not having to send the noisy one back now.

Edit - and we have video now too - this is before the repair. Note that some of the noises you hear when I move over to the other woofer is the camera re-adjusting. Sorry about the quality - this was a Fuji S700 taking the video.


Last edited by Oklahoma Wolf; 01-22-10 at 02:51 PM.
Oklahoma Wolf is offline  
post #39 of 99 Old 01-22-10, 03:27 PM
Senior Shackster
 
mwmkravchenko's Avatar
Mark
 
Join Date: Jul 2009
Location: Perth Ontario Canada
Posts: 580
Re: My Dual Tang Band 8x12 Tapped Horn Project

Lookin good!

Nice to see a guy who can think on his feet.

You have a front row seat to the famous Tang Band QC

Mark

___________________________________________________________________________ ___________

Mark

Artificial intelligence is no match for natural stupidity.
mwmkravchenko is offline  
post #40 of 99 Old 01-22-10, 03:27 PM
Elite Shackster
 
tcarcio's Avatar
TC
 
Join Date: Jun 2007
Location: Worcester Mass.
Posts: 3,374
My System
Re: My Dual Tang Band 8x12 Tapped Horn Project

Just my opinion but I would return it anyway. With that piece of metal in there it might have caused some damage that might not show up right away, No?
tcarcio is offline  
Reply

Bookmarks

Tags
8x12 , band , dual , horn , project , tang , tapped

Quick Reply
Message:
Options

Register Now




PLEASE COMPLETE ALL REQUIRED FIELDS BELOW... THANKS!

REQUIRED FIELDS ON THIS PAGE
YOU MUST COMPLETE ALL OF THESE

Username
Password
Confirm Password
Email Address
Confirm Email Address
Random Question
Random Question #2




User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
PLEASE READ BELOW PRIOR TO ENTERING AN EMAIL ADDRESS!

ATTENTION!

YOU MUST ACTIVATE YOUR ACCOUNT!

Activation requires you reply to an email we will send you after you register... if you do not reply to this email, you will not be able to view certain areas of the forum or certain images... nor will you be able download software.

AN INVALID EMAIL ADDRESS WILL CAUSE YOUR ACCOUNT TO BE DELETED!

See our banned email list here: Banned Email List

We DO NOT respond to spamcop, boxtrapper and spamblocker emails... please add @hometheatershack DOT com to your whitelist prior to registering or you will get nowhere on your registration.


Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML is not allowed!
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 


For the best viewing experience please update your browser to Google Chrome