Quick 'n fast- F.A.S.T - Page 4 - diyAudio
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 10th October 2012, 03:23 PM   #31
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
Quote:
Originally Posted by jameshillj View Post
Harry Olson's 8" RCA LC-1A
It is a 15"

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 10th October 2012, 04:04 PM   #32
diyAudio Member
 
Melo theory's Avatar
 
Join Date: Sep 2009
Location: Gulfport fl.
Quote:
Originally Posted by Bob Brines View Post
What ever. The point is that cone breakup has to be well above 1kHz.

Bob
Well, we don't have to use a 1st order crossover. It would be nice, but not necessary.
__________________
I LIKE YOU
  Reply With Quote
Old 10th October 2012, 05:39 PM   #33
diyAudio Member
 
mondogenerator's Avatar
 
Join Date: Sep 2009
Location: City Of Villans
Blog Entries: 1
Vix, im interested to know which 3" fullranges you have used with a 1st order HP at 300hz. I have TB W3-1285SG and MA A6, and NEITHER worked well at all high passed 1st order. I found 2nd order HP and 1st order LP worked far better at 300hz or thereabouts. Even with 47uf single cap giving a higher F3 didnt work well. Unless the driver Z at Fs is flattened i dont have much confidence in what you claim.
__________________
Every new piece of knowledge pushes something else out of my brain - Homer.....................Simpson
  Reply With Quote
Old 10th October 2012, 06:00 PM   #34
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
Quote:
Originally Posted by mondogenerator View Post
Unless the driver Z at Fs is flattened i dont have much confidence in what you claim.
A thread for Tysen and variations on FAST

Click the image to open in full size.

We went active with Tysen, but a similar mid-TL worked well with a 1st order series XO at a bit above 300 Hz.

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 10th October 2012, 06:22 PM   #35
diyAudio Member
 
tuxedocivic's Avatar
 
Join Date: Jan 2011
Location: Ladysmith, BC
Dave, that is cool. I wonder though if the actual acoustic slope would have been closer to 150hz on that one. As the filter engages the z peak at 200hz would resist the filter and then as it comes off the peak toward 150hz the filter would fully engage. I'm not sure that's how to technically describe it, but it's how my thought process works.

Edit - nevermind. You said series. I'm not sure how things would be effected.

Last edited by tuxedocivic; 10th October 2012 at 06:24 PM.
  Reply With Quote
Old 10th October 2012, 07:52 PM   #36
diyAudio Member
 
Bob Brines's Avatar
 
Join Date: Jan 2003
Location: Hot Spring Village AR
Of course, you don't have to do 1st order and you don't have to cross at 300Hz. Where you cross is dependant on all of the other parameters of you speakers/room. You do need substantial overlap, even 4th order and you want the woofer cone breakup as far down as possible. But then again, you want to unload the FR as much as possible, and you need the phase rotations as low as possible. These are conflicting requirements. You simply play with it until is sounds right. Hence the beauty of DSP.

Bob
  Reply With Quote
Old 11th October 2012, 05:25 AM   #37
diyAudio Member
 
mondogenerator's Avatar
 
Join Date: Sep 2009
Location: City Of Villans
Blog Entries: 1
nice post Dave, it illustrates my point perfectly. Aperiodic mid loading, or impedance conjugate is the only way i can see a 300hz xo working well with a 3" driver. Clearly filtering at the preamp stage is the only way to cross 1st order and get the correct filter slope.
__________________
Every new piece of knowledge pushes something else out of my brain - Homer.....................Simpson
  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
DBX RTA-M measurement mic,M audio fast track usb. Quick sale tomat Swap Meet 6 21st September 2011 03:09 AM
Fast sub anyone? cr0wl3y Subwoofers 63 29th May 2010 03:42 PM
Quick quick question ! guitvinny Pass Labs 6 7th February 2007 04:20 PM
THAT was fast DragonMaster Everything Else 0 25th August 2006 05:52 PM
How fast are 'Fast Fuse' and how to identify? bigpanda Solid State 7 22nd March 2005 09:00 PM


New To Site? Need Help?

All times are GMT. The time now is 12:19 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