New Jordan driver - preliminary details - Page 19 - 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 26th January 2013, 01:10 PM   #181
rdf is offline rdf  Canada
diyAudio Member
 
rdf's Avatar
 
Join Date: Jun 2004
Location: big smoke
Quote:
Originally Posted by Scottmoose View Post
You were talking about reduced excursion in the octave above tuning (utter twaddle since it is a rather well known fact that this is the region of maximum excursion in most vented box configurations, the one you posted self-evidently being no exception)....
Post 166? It's been a while but isn't the dashed blue line free air excursion? If so excursion would appear to be lower for the vented case, as well as closed box as I recall. The peak above tuning frequency is still substantially lower. What am I missing?
__________________
Ears aren't microphones.
  Reply With Quote
Old 26th January 2013, 01:25 PM   #182
Colin is offline Colin  United Kingdom
diyAudio Member
 
Join Date: Aug 2003
Location: UK
Quote:
Originally Posted by Scottmoose View Post
If you want to maximise dynamic range, that's certainly the way forward. There are limits to what unsupported wideband units, even ones with considerable travel available to them, can do.
Yes, that's what I was getting at - although I can certainly see the attraction of going for bass extension. It's the usual matter of choosing your own particular compromise, although I don't find the satellite/sub approach loses anything, other than floor space.
  Reply With Quote
Old 26th January 2013, 01:31 PM   #183
diyAudio Member
 
Scottmoose's Avatar
 
Join Date: Mar 2005
Location: UK
The gentleman was, I believe, claiming an MLTL with an F3 of 30Hz provides reduced driver excursion in the octave above Fb compared to enclosures tuned to a higher frequency. Which is nonsense, since in the vast majority of vented alignments (including the one for which he posted a displacement curve) maximum driver deflection occurs in this region. This octave naturally varies according to Fb. It is ironic though that the MLTL alignment I posted, which Mr. Dikovics has taken such an exception to, provides considerably lower driver deflection in the 60Hz - 100Hz region he originally stated he was concerned about, and indeed at all other frequencies < 150Hz, apart from the narrow region around Fb in the plot he posted in post 166. Of course, being tuned higher, my box doesn't have as much output in the low 30Hz regions, trading this off against a more balanced output higher up, a very flat impedance load, and very linear driver deflection. Here are the two displacement plots together, to ease comparisons:
  Reply With Quote
Old 26th January 2013, 01:32 PM   #184
Colin is offline Colin  United Kingdom
diyAudio Member
 
Join Date: Aug 2003
Location: UK
FWIW, my take on the debate between Mark and Scott is that it is valuable to have different approaches to enclosure design. Pick the designer whose preferences matches your own. The more designs available for a given driver, the better.
  Reply With Quote
Old 26th January 2013, 01:38 PM   #185
diyAudio Member
 
Scottmoose's Avatar
 
Join Date: Mar 2005
Location: UK
Exactly Colin. I have no issues whatsoever with Mark's boxes; they are self-evidently perfectly valid enclosure designs of their type. But they are not the only valid type of MLTL alignment, and my purpose behind providing the one a couple of pages ago was to offer something a little different from the more usual run. For it, I decided to use an alignment I regularly employ, and known to be very effective. This is DIY: as you say, a range of box alignments to suit different preferences is usually nice to have, at least in my experience.

Last edited by Scottmoose; 26th January 2013 at 01:49 PM.
  Reply With Quote
Old 26th January 2013, 04:52 PM   #186
diyAudio Member
 
Scottmoose's Avatar
 
Join Date: Mar 2005
Location: UK
Disregard some of the above. I think we shall leave it that Mike and I have provided different box alignments. With any luck, a mod. might clean the thread up a bit, since it's a distraction from the Eikona, which isn't fair.


Quote:
Originally Posted by smallangryboy View Post
Scott

I wondered if you would be able to do me a favour? Would you be able to see how both the Jordan EIKONA and the EAD E100HD may model in this cabinet?
Sure. With the Eikona at any rate. A handful of FR plots attached; sans, with light & slightly more extensive damping. The other graphs assume the latter (0.5lbs ft^3 damping throughout). It doesn't go very low & has a bit of harmonic ripple, although in practice I'd expect that to be slightly less than indicated. Note that these are quasi-anechoic plots, that do not consider room-gain, amplifier output impedance, or the driver's actual rather than mathematical response. Carefully positioned, you may be able to get away without any compensation circuits since you've a free space baffle F3 of about 646Hz. The LF of the Eikona is rising somewhat at this point relative to where it's at between ~800Hz - 4KHz (see attached. Every little helps), & when it finally rolls off, the box may provide some balancing gain. Might be a bit of a dip between these points, but we're in the region dominated by the room in any case, where you're never going to get anything flat without masses of measurement & Eq.

If I'm honest, not great, but for what it is (a very small TL), I've seen worse.
Attached Images
File Type: png Labyrinth.png (108.3 KB, 219 views)
File Type: jpg Eikona_FR.jpg (99.1 KB, 211 views)

Last edited by Scottmoose; 26th January 2013 at 05:15 PM.
  Reply With Quote
Old 26th January 2013, 05:00 PM   #187
diyAudio Member
 
Join Date: Dec 2004
Quote:
Originally Posted by Scottmoose View Post
Sure. With the Eikona at any rate, I've seen worse for what it is (a very small TL). A handful of FR plots attached; sans, with light & slightly more extensive damping. The other graphs assume the latter (0.5lbs ft^3 damping throughout). It doesn't go very low & has a bit of harmonic ripple, although in practice I'd expect that to be slightly less than indicated.
Thanks Scott, very much appreciated, scratch that design then...
  Reply With Quote
Old 26th January 2013, 08:54 PM   #188
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 Scottmoose View Post
The other graphs
Of note should be the impedance curve. Guys, time to break out your current amplifiers.

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 26th January 2013, 10:22 PM   #189
diyAudio Member
 
Scottmoose's Avatar
 
Join Date: Mar 2005
Location: UK
Yeah, it's almost as flat as the MLTL I did, so those using amplifiers with a high output impedance should be fairly happy. They're about as unreactive as it gets.
  Reply With Quote
Old 26th January 2013, 11:09 PM   #190
GM is offline GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
it seems that no matter how many times it gets posted or who posts it, the vast majority of folks 'raised' on stupid high DF amps and T/S specs don't understand that a loudspeaker is just one link in the signal chain, so best overall performance requires designing it as part of a system that includes the room.

GM
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  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
I really need some details for this driver. Boscoe Subwoofers 1 18th April 2010 06:19 PM
Driver details Twisted85 Multi-Way 7 1st November 2009 07:00 PM
details for videologic digitheatre dts sub driver please m1c Subwoofers 8 5th October 2008 02:24 AM
SMPS driver transformer details needed dhanukak Power Supplies 0 25th September 2007 08:17 AM
Jordan driver sma Full Range 0 12th February 2004 01:07 PM


New To Site? Need Help?

All times are GMT. The time now is 05:44 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