Collaborative Tapped horn project - Page 152 - diyAudio
Go Back   Home > Forums > Loudspeakers > Subwoofers

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 12th April 2008, 07:59 PM   #1511
GM is offline GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
Thanks! OK, best to assume that a watt or two down low is all it's good for then without some room gain:

GM
Attached Images
File Type: gif mtx 6.5 18.32-130.27 hz expo th - specs.gif (13.4 KB, 799 views)
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote
Old 12th April 2008, 09:57 PM   #1512
diyAudio Member
 
rcavictim's Avatar
 
Join Date: Jun 2004
Location: Next to an open wormhole NW of Toronto
Quote:
Originally posted by boydon_lepasci


It's a 6-1/2" midbass from an MTX RT260S component set. Unfortunately I don't have a datasheet with Xmax on it. The TS parameters I am using are from the Woofer Tester II. Could you post the input window that goes with that SPL plot? I'm still trying to get the hang of picking flare rates and adapting them to the desired BW(using Leach's math via ML Util) and efficiency.

112dB SPL at 30 Hz from a 6-1/2" driver? What is the motor made of, plutonium with a diamond cone? That plot GM showed a couple of posts back of this driver's expected performance looks uber nice. Almost too nice. What am I missing here?
__________________
"There are more worlds than the one you can hold in your hand." Albert Hosteen, Navajo spiritual elder and code-breaker, X-Files TV Series.
  Reply With Quote
Old 12th April 2008, 10:07 PM   #1513
MaVo is offline MaVo  Germany
diyAudio Member
 
Join Date: Jan 2006
Quote:
Originally posted by rcavictim
What am I missing here?
A horn of almost 800 liters.
  Reply With Quote
Old 13th April 2008, 07:00 AM   #1514
djk is offline djk
diyAudio Member
 
djk's Avatar
 
Join Date: Feb 2001
Location: USA
"What am I missing here?"

4 ohm driver with 10V input = 25W for 112dB, and it's huge.
__________________
Candidates for the Darwin Award should not read this author.
  Reply With Quote
Old 13th April 2008, 08:46 PM   #1515
freddi is offline freddi  United States
diyAudio Member
 
freddi's Avatar
 
Join Date: Aug 2005
hey guys - - are there appropriate 12" drivers available in US to work in a tapped horn about the size and configuration of William's updated 30Hz horn? - I need suggestions TIA Freddy
  Reply With Quote
Old 13th April 2008, 10:14 PM   #1516
freddi is offline freddi  United States
diyAudio Member
 
freddi's Avatar
 
Join Date: Aug 2005
its been awhile since I looked at TH --tell me if this diagram is labeled correctly for modeling and if not please correct it
http://img224.imageshack.us/img224/644/30hzdia1brb3.gif
  Reply With Quote
Old 13th April 2008, 10:20 PM   #1517
diyAudio Member
 
MikeHunt79's Avatar
 
Join Date: Aug 2003
Location: Bristol, UK
I'm slowly getting to grips with hornresp, thru trail and error mainly. That tapped horn wizard thing is awesome tho, it would be even better is more values could be tweakable in the wizard...

Anyway, I've worked on a couple of enclosures for my Eminence Magnum 12HO, and it seems to be a trade off between SPL and bandwidth... Both are around 250L which is a nice size for me.

Both are 1 x pi:
Click the image to open in full size.

I'm thinking the black curve would be better, as I'm getting almost an extra 3db, with only slightly less extension?
  Reply With Quote
Old 14th April 2008, 01:24 AM   #1518
tb46 is offline tb46  United States
diyAudio Member
 
Join Date: Jan 2006
Location: Texas
Default Eminence_Magnum_12H0_MikeHunt79

Hi MikeHunt79:
I had about the same for that one, the small inductor takes care of the passband wobbles.
Attached Images
File Type: jpg th_eminence 4012_30hz_small.jpg (64.9 KB, 727 views)
__________________
Oliver
  Reply With Quote
Old 14th April 2008, 02:29 AM   #1519
aceinc is offline aceinc  United States
diyAudio Member
 
Join Date: May 2007
I have a pair of drivers with the following specs;

QTS: .33
QMS: 4.69
QES: .35
VAS: 1.822 sq Ft, 51.6 litres
SPL: 88
FS: 25.4
RE: 4
LE: 1.2
XMAX: 4.3 mm
They are nominal 10" drivers, actual piston area is about 8.25".

I was hoping someone might model these either as a single driver, or perhaps using the pair sliding the second driver up the throat to see if it "improves" things.

Paul
  Reply With Quote
Old 14th April 2008, 03:40 PM   #1520
diyAudio Member
 
MikeHunt79's Avatar
 
Join Date: Aug 2003
Location: Bristol, UK
Default Re: Eminence_Magnum_12H0_MikeHunt79

Quote:
Originally posted by tb46
Hi MikeHunt79:
I had about the same for that one, the small inductor takes care of the passband wobbles.
I'm guessing the inductor is 2.6mH, judging by the difference in the Le value? It definitely helps tho, I've tried adding one to my intended box and it didn't really help much as it increased the 80Hz dip.

Just a quick question, isn't the compression ratio a little high? I thought you shouldn't go above 3:1, so 552:1 seems too much...

Anyway, I'm pretty happy with this design, even tho it isn't amazingly flat, I'm gonna have a go at building it:
Click the image to open in full size.

I used the spreadsheet posted earlier to see that it will be less than 8ft tall which means it will fit in my room... Now the only part I'm struggling with is how to actually convert into a finished design... Are there any links for anything similar which show how to turn the sim into an enclosure design? I'm going thru the wiki right now, and I may yet strike gold.

EDIT: Aceinc, the FS looks a little low on that driver, but try putting the values in hornresp anyway, and see how it performs.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not 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 code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



New To Site? Need Help?

All times are GMT. The time now is 02:17 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2