Beyond the Ariel - Page 302 - diyAudio
Go Back   Home > Forums > Loudspeakers > Multi-Way

Multi-Way Conventional loudspeakers with crossovers

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 12th January 2008, 05:51 AM   #3011
Banned
 
Join Date: Feb 2004
Location: Portal 2012
Click the image to open in full size.

Magnets, wire, mylar and frame.

Click the image to open in full size.
  Reply With Quote
Old 12th January 2008, 03:06 PM   #3012
Banned
 
Join Date: Feb 2004
Location: Portal 2012
Default Re: Sobering Article in Rolling Stone - High Def Audio

Quote:
Originally posted by Lynn Olson

The Death of High Fidelity.

Quite a counterpoint to the CES madness this week, isn't it? More on the topic here.

After all the fanfare and industry buzz about the wonderful convenience and versatility of software-based Digital Audio Workstations, this is what the software is actually used for - extreme dynamic compression that was technically impossible back in the all-analog days.


What we need to do is to form a motivated group of people with backing by the musicians / performers / recording engineers / music lovers / audiophiles to collectively create a standard licensed format- maybe call it Hi Def Audio or HDA (similar to THX in being a licensed format for self monetary support) that would set the rules for modern recordings

Lay down the law on compression, mixing, frequency response, miking and mastering techniques, ect... - use the license money to promote the quality of the playback, deeper music appreciation, ect. and educate people on the benefits of high quality music playback

If there is a will there is a way!
  Reply With Quote
Old 14th January 2008, 12:02 AM   #3013
ScottG is offline ScottG  United States
diyAudio Member
 
Join Date: Feb 2003
Location: US
Default Re: Re: Re: Gradient Helsinki 1.5

Quote:
Originally posted by AJinFLA


I highly doubt that.

cheers,

AJ

..and you would be correct, I was wrong.

http://www.audiocircle.com/circles/i...&topic=49585.0

Clearly from that 2nd picture its a dipole. I'm guessing what that forum isn't getting is the concept of polar rotation.

I don't think though that it has anything to do with corner loading per se. (..though again of course I always could be wrong.)
__________________
perspective is everything
  Reply With Quote
Old 15th January 2008, 10:47 PM   #3014
diyAudio Member
 
Join Date: Jan 2004
Location: Washington State
Default Sica

Lynn ... Jensen suggested this for my UB waveguide. http://www.sicaspeakers.com/12K3.pdf
Looks good for OB if not too stiff. Not as efficient as I would like, but beggers ...
Zene
  Reply With Quote
Old 16th January 2008, 02:19 AM   #3015
AJinFLA is offline AJinFLA  United States
Banned
 
Join Date: Feb 2005
Location: Tampa
Default Re: Re: Re: Re: Gradient Helsinki 1.5

Quote:
Originally posted by ScottG



..and you would be correct, I was wrong.

http://www.audiocircle.com/circles/i...&topic=49585.0

Clearly from that 2nd picture its a dipole. I'm guessing what that forum isn't getting is the concept of polar rotation.

I don't think though that it has anything to do with corner loading per se. (..though again of course I always could be wrong.)
Interesting. But is that Gradient at CES, or electronics manufacturer X, using their speakers in that room? Still believe it's primary intent is smaller Euro rooms, where corner placement might be dictated.
Jorma Salmi is a designer who knows what he is doing (near top IMHO). Not sure why he wouldn't use a coax for MT, but I'm sure he has his reasons for that particular design.
The polar opposite of the brain dead designs that make up about 95% of speakers I see pictured at the show (that Audiocirce site had a ton of pics). Some of them sure look pretty enough to sound good to audiophiles though.

cheers,

AJ
  Reply With Quote
Old 16th January 2008, 09:35 PM   #3016
MtnBob is offline MtnBob  United States
diyAudio Member
 
MtnBob's Avatar
 
Join Date: Dec 2003
Location: 8800 ft above sea level
Hello all, This is a little late, but I've been out of town for 3 weeks. About 30 (or so) posts back cone tweeters were mentioned. I've been listening to them for over 40 years and I like them over domes, but it's hard to find any new ones. I prefer open back for dipole use. Anyone know of a source other than e-bay or the thrift store?
__________________
"Whenever you find you are on the side of the majority, it is time to pause and reflect."
Mark Twain
  Reply With Quote
Old 18th January 2008, 09:27 PM   #3017
mige0 is offline mige0  Austria
diyAudio Member
 
mige0's Avatar
 
Join Date: Jan 2005
Location: Austria, at a beautiful place right in the heart of the Alps.
Hi


The topic of Doppler genererated intermodulation distortion is something pretty interesting and I adopted my earlier spreadsheet with the functionality to import and process any measured or simulated speakers.

Exported data of the beautiful simulation software "Hornresp" from David J McBean can be imported almost directly.





Click the image to open in full size.


http://members.aon.at/kinotechnik/di...distortion.xls





Now its very simple to check open baffle against closed box or horn and wave guide.




Have fun !
Michael
  Reply With Quote
Old 18th January 2008, 09:51 PM   #3018
diyAudio Member
 
chrismercurio's Avatar
 
Join Date: Aug 2006
Location: Silicon Valley
Default Drivers

It seems like driver selection is still way up in the air. Why not put these into the mix...

http://www.harman-japan.co.jp/produc...me/1500al.html

http://www.harman-japan.co.jp/produc...ome/435be.html

http://www.harman-japan.co.jp/produc...e/ut045be.html

They aren't really cheap, or even affordable...but they probably sound nice.

C
  Reply With Quote
Old 19th January 2008, 08:01 AM   #3019
diyAudio Member
 
Lynn Olson's Avatar
 
Join Date: Jul 2004
Location: Northern Colorado
The 435Be is the most interesting of all, and there is no direct equivalent - the process TAD uses to form their Beryllium diaphragm is different (vapor deposition vs JBL's preformed sheets). I'd still use a Tractrix or LeCleac'h waveguide instead of JBL's horn, though - BiRadial horns are optimized for coverage, not impulse response.

Good article here on the development of the 435Be. The sonic inferiority of Titanium diaphragms compared to Aluminum is discussed with refreshing frankness, along with the surprising admission that "both aluminum and titanium compression driver diaphragms are in breakup for much of their response".

Diaphragm breakup means high distortion, chaotic wavefronts coming out of the phase plug, and non-minimum phase FR deviations - all bad things. To examine one point alone, if the diaphragm is in breakup, that means different portions are out of phase with each other, instead of emitting coherently.

This invalidates the underlying design assumptions of the phase plug, which in turn means that the wavefront emerging from the phase plug is no longer coherent and uniform. If the wavefront isn't uniform entering the horn, it will certainly be in much worse shape by the time it leaves the horn with additional diffraction artifacts added in. Thus, a frequency response with many small deviations, polar response with narrow artifacts, and time response that takes a long time to settle to zero. All from diaphragm breakup.

I'll grant that soft-dome tweeters are in breakup over much of their range as well, but that's a bit different - the damping goo spread onto the silk dome diffuses the resonances into a very fine-grained pattern, and there is no phase-plug assembly and horn to magnify small departures from coherent radiation into big ones. And it's no secret that pushing a soft-dome tweeter into 100+ dB SPL's is not a good idea from either a distortion or longevity standpoint.
  Reply With Quote
Old 25th January 2008, 04:08 PM   #3020
dobias is offline dobias  United States
diyAudio Member
 
Join Date: Jun 2007
Default Center Speaker

Gentlemen,
I don't recall seeing center speakers discussed in this (lengthly) thread.
I would like to spread out my OB speakers for furniture placement reasons. What are the pros & cons about using a center OB speaker?
If it is a reasonable addition, I remember(from my younger years)there were various ways to wire it, all with different disadvantages. Any wiring suggestions?
dobias
  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



New To Site? Need Help?

All times are GMT. The time now is 11:41 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