Single sheet TH challenge - Page 155 - 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 22nd May 2012, 01:54 PM   #1541
tb46 is offline tb46  United States
diyAudio Member
 
Join Date: Jan 2006
Location: Texas
Default Posts #1539/1540

Hi Phil B,

If you made a Hornresp model, did you change it to a TH1 model by double-clicking on TH? That way you can add your horn extension as S4/S5. You may then have to use Exp for the S2/S3 horn segment as this horn has multiple tapers.

Regards,
__________________
Oliver
  Reply With Quote
Old 22nd May 2012, 02:01 PM   #1542
diyAudio Member
 
Join Date: Jan 2008
Quote:
Originally Posted by Brian Steele View Post
Something really looks a bit off there. Did you do an impedance response test on your SS15 to see if it was a good match for the HornResp model?
Brian,

Indoor room modes often dominate low frequency measurements. Move the microphone or the speaker around and the response will change.

The indoor warehouse response simply reflects the "boom boom room" effect, their previous outdoor tests match the "normal" SS15 response pretty closely, as can be seen in the two screen shots of the same speakers below.
Left is in the warehouse, right is outdoors.
Attached Images
File Type: jpg Indoor:outdoor.jpg (87.0 KB, 418 views)

Last edited by weltersys; 22nd May 2012 at 02:03 PM.
  Reply With Quote
Old 22nd May 2012, 02:36 PM   #1543
Phil B is offline Phil B  Australia
diyAudio Member
 
Join Date: Jan 2012
Location: Melbourne
Hi

I`ll have to ask Mr Rich ( R23d) about the hornresp modelling, he plugged in most of the data and we only made some small changes to match the RCF drivers.
As for the difference between indoors and outdoors I`ll have to go back to my statement of Holm Impulse giving us some very strange readings. It seems to fill in the gaps until it gets stable enough to plot properly. The REW measurements are very good and reflect what my ears think the boxes are doing. We tried running full range sweeps with Holm on the Unities and Subs combined outdoors. It just couldn`t give us an accurate reading with all the passband gains set at relative volume, it would seem to latch onto the highs and ignore the subs / mids.
NOW I must confess I hardly know the program and was intrigued to try it out. Again if I had the time to sit down with it and work out why we getting these results I`d love to! BUT time meant we moved to REW and now have two sets of results on two different measurement programs......not ideal or helpful!!
The warehouse we measured in was VERY big but full of clutter. Also we measured from 3-4m away on initial runs. So even with the mic pointing at the floor from < 1cm we might have got some room modes.The very first measurement runs were made with temp barn doors on one box at about 2am....not too scientific!
I personally am very happy with the result the doors give. We knew the subs were never going to reach 35hz or be 6db louder with them but they have added a simple, cheap way of getting nearer to that!

Phil B
  Reply With Quote
Old 22nd May 2012, 02:46 PM   #1544
Djim is offline Djim  Netherlands
diyAudio Member
 
Join Date: Dec 2009
Location: 'Ollanda
Hi Phil B,

Do you have indoor measurements of the same setup without the "barn doors"?
  Reply With Quote
Old 23rd May 2012, 01:38 PM   #1545
diyAudio Member
 
Join Date: May 2012
Default Thanks

As a new person to this site I just want to say thanks. This thread is an example of the collaboration that is the very best of the internet. I plan to build four to six of these this summer as a church youth group project. I am trying to create an initial lead booklet on the project for the kids and this thread at over 150 pages and 1500 posts has become a monster to navigate and extract the latest/best information from. Would it be possible to pull out and collect at the top of the thread:

1)The latest cutsheet
2)Recommended materials including adhesives and finishes
3)Assembly tips including where additional bracing may be wise even if they don't come out of a single sheet
4)Tips on finishing
3)Thoughts on best locations and options for handles, pole sockets, input panels.
4)Recommended drivers, response simulations for those drivers, real world measurements for those drivers
5)Recommended signal processing and amplifier power

Again this is a thread for the ages thanks to all the collaborators.
  Reply With Quote
Old 23rd May 2012, 03:44 PM   #1546
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
I echo Dynamic's request.
An index in post1, showing links to the best bits of information would be really helpful to everyone reading this Thread.
__________________
regards Andrew T.
  Reply With Quote
Old 23rd May 2012, 09:41 PM   #1547
jbell is offline jbell  United States
diyAudio Member
 
Join Date: Apr 2003
Location: .
Quote:
Originally Posted by AndrewT View Post
I echo Dynamic's request.
An index in post1, showing links to the best bits of information would be really helpful to everyone reading this Thread.
I've pm'd mods a couple times with the same request. If we can get moderator approval, I'd sure like to edit post 1 for just exactly that.

moderator? please??
  Reply With Quote
Old 23rd May 2012, 10:16 PM   #1548
jbell is offline jbell  United States
diyAudio Member
 
Join Date: Apr 2003
Location: .
ahhh... THANK YOU... I now see an 'edit' on post 1.... Anyone with votes for favorite posts, let's hear them. In a couple days I'll compile a list of the best, and put it in the first post.
  Reply With Quote
Old 24th May 2012, 08:48 AM   #1549
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Jbell,
the edit first post feature was brought in many weeks ago.

You don't need to ask the Moderators.
__________________
regards Andrew T.
  Reply With Quote
Old 24th May 2012, 02:00 PM   #1550
...truth seeker...
diyAudio Member
 
Ed LaFontaine's Avatar
 
Join Date: Feb 2004
Location: where the Appalachians rise from the Blue Grass
jbell, Thank You...the editing into post #1 has begun
  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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Here is a Challenge latala Solid State 41 12th May 2011 01:13 AM
Renovation Challenge ZirconiumZephyr Multi-Way 16 1st September 2009 08:38 AM
Design Challenge #1 kgillies Subwoofers 12 13th June 2007 03:20 PM
a challenge --or I need help lawrence99 Car Audio 0 9th March 2005 04:44 AM
The challenge ! thylantyr Solid State 51 24th July 2003 08:41 PM


New To Site? Need Help?

All times are GMT. The time now is 03:03 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