Single sheet TH challenge - Page 85 - 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 1st April 2011, 08:45 PM   #841
diyAudio Member
 
Join Date: Jan 2011
Quote:
Originally Posted by Djim View Post
An overview of SS15 with old and new 3015lf driver and the SS15 with 18Sound 15W700.
Hey I just noticed those were all 2 pi tests. Do you have those comparisons with 1 pi testing?

And if I'm reading it correctly, those sims are at 2.83V right?

Last edited by m R g S r; 1st April 2011 at 08:56 PM.
  Reply With Quote
Old 1st April 2011, 09:28 PM   #842
Djim is offline Djim  Netherlands
diyAudio Member
 
Join Date: Dec 2009
Location: 'Ollanda
Just download HornResp and you can copy the numbers as given in my examples for the drivers you like to see (halving Pi means +5dB)

The maximum safe excursion and SPL graphs are calculated for each driver independently. In these graphs you can find the corresponding power in Watts and excursion in millimetres. In reality the excursion will be less then predicted since HornResp isn't able to predict the compression factor for each driver.
  Reply With Quote
Old 1st April 2011, 09:32 PM   #843
diyAudio Member
 
Join Date: Jan 2011
I have a Mac so I can't as far as I know unless hornsresp works on a Mac now ? (not running windows on a Mac)

And woopss I meant 4pi Aka Into free space (that's how I'll be using my ss15)

Last edited by m R g S r; 1st April 2011 at 09:43 PM.
  Reply With Quote
Old 1st April 2011, 10:20 PM   #844
Djim is offline Djim  Netherlands
diyAudio Member
 
Join Date: Dec 2009
Location: 'Ollanda
4 pi works the other way around so -5dB will work. Any drivers in particularly you are interested?
  Reply With Quote
Old 2nd April 2011, 10:02 PM   #845
jbell is offline jbell  United States
diyAudio Member
 
Join Date: Apr 2003
Location: .
Finally had a chance to do a bit of testing outside. I also tried to put to numbers some of the things I knew, but never documented. (like on side vs upright)

I also did a quick 'directivity test' where I drew a 10meter circle, started a sine wave and then walked around with a spl meter.

Pretty interesting stuff (at least to me....)
Attached Images
File Type: jpg ss15 responsesidevsupright.JPG (84.1 KB, 1397 views)
  Reply With Quote
Old 2nd April 2011, 10:13 PM   #846
Djim is offline Djim  Netherlands
diyAudio Member
 
Join Date: Dec 2009
Location: 'Ollanda
Nice results Jbell. But before you make a conclusion between horizontal and vertical position, remember that you are measuring trough a tiny microphone membrane and nobody puts his ear to the ground (not meant as critic but as a reminder ;-).

Last edited by Djim; 2nd April 2011 at 10:16 PM.
  Reply With Quote
Old 2nd April 2011, 10:47 PM   #847
diyAudio Member
 
Join Date: Jan 2008
Quote:
Originally Posted by jbell View Post
Finally had a chance to do a bit of testing outside. I also tried to put to numbers some of the things I knew, but never documented. (like on side vs upright)

I also did a quick 'directivity test' where I drew a 10meter circle, started a sine wave and then walked around with a spl meter.

Pretty interesting stuff (at least to me....)
Distant surroundings can have significant impact on LF test results, as I found with my outdoor directivity tests.

What was the distance between the SS15 and the nearest building ?
What was the direction of the SS15 in relation to the nearest building?

Art
  Reply With Quote
Old 2nd April 2011, 10:57 PM   #848
diyAudio Member
 
Join Date: Nov 2010
Quote:
Pretty interesting stuff (at least to me....)
Jim; I would like to do my testing as close to yours as posible. Did you set your level to 2.83VRMS using 60Hz? Andy
  Reply With Quote
Old 3rd April 2011, 12:59 AM   #849
jbell is offline jbell  United States
diyAudio Member
 
Join Date: Apr 2003
Location: .
Quote:
Originally Posted by 4pyros View Post
Jim; I would like to do my testing as close to yours as posible. Did you set your level to 2.83VRMS using 60Hz? Andy
When I do my sine wave tests, I just leave the meter connected. If there is a bit of drift off of 2.83v, I make fine adjustments.
  Reply With Quote
Old 3rd April 2011, 02:31 PM   #850
diyAudio Member
 
Join Date: Nov 2010
Can I cheak the resonance of the TH sub by cheaking the AC current with a DVM and looking for a Dip? Andy
  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 02:12 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