Go Back   Home > Forums > Loudspeakers > Full Range

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 18th March 2011, 05:36 PM   #11
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
Chris touched on our use of SDX7. The SDX7 gives no warning of running out of excursion. You just get a very disturbing "fart" when the voice coil hits its stops. To avoid this one needs to use a sealed box, an aperiodic box (the TL we built had to get stuffed to aperiodic to avoid the ugly noises, or you need to actively filter below the tuning frequency of a "vented" box.

Remeber that when you look at how loe a woofer goes F3 is mostly meaningless, F10 is much more significant, and things will sounf better if the slope of the roll-off more closely matches the room gain,

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 21st March 2011, 02:15 PM   #12
rho is offline rho  Belgium
diyAudio Member
 
Join Date: Sep 2003
Location: Peer, Belgium
How big was the room and at what SPL did you get the bottoming-out of the driver?

Do you know what the F10 of an SDX7 in a 15 liter box is? (I migrated to linux, still need to find some good simulation SW)
  Reply With Quote
Old 21st March 2011, 05:35 PM   #13
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
We have no issues with SDX7 bottoming when sealed. My room is pretty large, the amp we were using was running out before the speakers, max levels were louder than i usually listen to (bit not really really loud).

14 litre sims as Q = 0.58, F3 ~ 70 Hz, F10 ~ 33 Hz

The chart is from the SDX7 sealed doc, 3.5, 7, 14, 21 litre, Q = 1.0, 0.707. 0.58, 0.5

dave
Attached Images
File Type: gif SDX7-sealed-alignments.gif (18.1 KB, 187 views)
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 23rd March 2011, 06:38 PM   #14
rho is offline rho  Belgium
diyAudio Member
 
Join Date: Sep 2003
Location: Peer, Belgium
Thanks for the info.
I think I'll have to put the SDX7 at the top of my shortlist then.
  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
Compact bookshelf design recommendation? kenny12 Multi-Way 24 23rd May 2009 09:00 PM
Compact TL design thoughts Larsp Subwoofers 0 23rd January 2007 12:20 AM


New To Site? Need Help?

All times are GMT. The time now is 03:38 AM.


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