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 1st September 2011, 10:37 PM   #21
Greg B is offline Greg B  United States
diyAudio Member
 
Join Date: May 2004
Location: Los Angeles, California
Quote:
there is some precedence for this approach in the old SDX7/alpair5 combo.
Even more precedent than that... I 'stole' the idea from an old ~1970 pair of Wharfedales I had. 2 ways with a crossover near 1kHz were common in the 60's AFAIK. The original AR-1 used an Altec 755 as a 'tweeter'.

This is really the kind of project where you'd want to try a few different crossover points and decide for yourself. Dave reports plenty of dynamic range with a 350hz crossover, and I do like crossing at the baffle step if possible. OTOH, years ago I crossed an FF125K to a 10" bass driver at about that zone, and it clearly could not keep up with the woofer, at least with a 1st order highpass. Obviously a steeper and/or active crossover will solve that, but introduces its own problems.
  Reply With Quote
Old 2nd September 2011, 12:45 AM   #22
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 chazdrumzalot View Post
SDX7/alpair5 combo. Crossover points anywhere from 500hz to 1.5khz were suggested
If it has the minimal treatment SDX7 rolls off fairly smoothly at 1.4-1.5 kHz. If stock it is a rollercoaster above 500 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 6th November 2011, 06:56 AM   #23
diyAudio Member
 
norman bates's Avatar
 
Join Date: Nov 2003
Location: iowa
FF225wk.
I know it ain't cheap, but what about adding a fostex supertweet ?
Like the ft96h ?

http://www.fostexinternational.com/d...f/ft96hrev.pdf

Not sure but a 2uF should be a pole near 10khz.
They recommend 1uF (20khz pole, -3db@20khz, -9db@10khz). This seems too high for me.

Norman
  Reply With Quote
Old 6th November 2011, 09:11 AM   #24
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
Steve the shawdow (the guy that came up with Metronome) has just done up (with Toppy's help) an FF225wk Met + FT17. He found a 1 uF worked right afetr trying a whack of variations.

Last post in the thread (as of now)

audio-talk :: View topic - Axiom 401 in a Metronome Cabinet

A more efficient tweeter would need a smaller cap.

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 7th November 2011, 03:41 PM   #25
chrisb is offline chrisb  Canada
diyAudio Member
 
Join Date: Aug 2002
Location: victoria BC
Quote:
Originally Posted by norman bates View Post
FF225wk.
I know it ain't cheap, but what about adding a fostex supertweet ?
Like the ft96h ?

http://www.fostexinternational.com/d...f/ft96hrev.pdf

Not sure but a 2uF should be a pole near 10khz.
They recommend 1uF (20khz pole, -3db@20khz, -9db@10khz). This seems too high for me.

Norman

if the extreme extension and sensitivity of this class of horn super tweeter is not essential, something like the 85WK allows a lot more flexibility in terms of playing with XO corner and slopes, for slightly more than 1/4 the cost of the FT96H
__________________
you don't really believe everything you think, do you?
community sites t-linespeakers.org, frugal-horn.com commercial site planet10-HiFi
  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
Swap: Fostex T825 for a higher efficiency top tweeter by Fostex, Coral etc anubisgrau Swap Meet 1 22nd July 2012 06:12 PM
FS: 2 super tweeters Fostex T90A + 2 attenuators Fostex AT50H merlin el mago Swap Meet 7 29th October 2010 09:14 PM
fostex 208ez and fostex ft17 h good kombo? almightybozo Full Range 1 24th September 2010 06:00 PM
FOSTEX FE126 in Fostex BR Enclosure nafunga Full Range 3 29th July 2008 07:21 PM
WTB: a pair of Visaton B200 or Fostex F108ES or Fostex FE126e or Jordan JS92S Rafal Swap Meet 0 10th November 2006 01:35 PM


New To Site? Need Help?

All times are GMT. The time now is 02:39 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