Seas U16RCY/P + Seas 27TBCD/GB-DXT = Prestigious Two – Monitor DXT - Page 4 - 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 July 2012, 06:09 AM   #31
diyAudio Member
 
chlorofille's Avatar
 
Join Date: Jul 2008
Location: Malaysia
For a start, the Scanspeak D3004 Beryllium!
  Reply With Quote
Old 12th July 2012, 08:41 AM   #32
gornir is offline gornir  Sweden
diyAudio Member
 
gornir's Avatar
 
Join Date: Sep 2007
Location: Sweden
Quote:
Originally Posted by 5th element View Post
With regards to the large peak @ 27kHz finding its way into the harmonic distortion via resonance amplification, this is an issue in mid/bass drive units, but I think it's much less of an issue in tweeters as the harmonics produced are higher then what we can hear. The only way these could be audible is via the creation of IMD products.
I agree with you that this kind of cone break-up for a mid-woofer would be a major issue that would have to be dealt with. The DXT tweeter has one of the sharpest cone break-ups I’ve ever measured and it contributes to a rise of about 8 times in the distortion profile for the third-order harmonics at 9kHz. Unfortunately with my measurement setup I cannot catch this, but I’ve seen other measurements done for this tweeter that shows the effect. One such is the German DIY magazine “Hobby & Hifi” issue 2010/1.

I also think that this effect shouldn’t be exaggerated, but some people are sensitive to it, others aren’t. I think it’s up to each and everyone to listen and see if it’s an issue or not and do their own conclusion. This was my main point with pointing it out. The DXT tweeter is a great driver, but it might not fit everyone’s sonic preferences.

Quote:
Originally Posted by gainphile View Post
I am a metal-cone kind of guy and aware of their 'issues'. In my ears the distortion numbers in higher frequency is no problem. But I dislike phase plug, hence where the DXT fits in! My "best" tweeter so far is Vifa DQ25 with phase shield removed. Sounds great except that resulting massive null at 15khz.
So as I really hope the Seas DXT will be a very nice compromise between smoothness and directivity . I'll report ...
The DXT tweeter is a great driver and I think you will be happy with it.

Quote:
Originally Posted by gainphile View Post
Göran, come on.. spill the beans. What are these tweeters you prefer over the DXT
I’ve used so many tweeters over the years, but if you force me to answer and I compare it with some tweeters I’ve recently used. This is my current favorites:

1. For twice the money ScanSpeak D3004/660000 (a class of its own)
2. For the same amount of money ScanSpeak D2608/913000 “HDS”
3. For less money Dayton Audio RS28F-4 (a good contender to the DXT)

As you can see, none of these are “metal” tweeters.

Quote:
Originally Posted by chlorofille View Post
For a start, the Scanspeak D3004 Beryllium!
Yes, I’ve also used the ScanSpeak Beryllium lately, but it’s so expensive so it’s not fair to compare it and it has a unique sonic character that is hard to compare with other hard dome tweeters and soft dome tweeters. I think this is a kind of tweeter you either love or hate, so to speak.

Regards

/Göran
__________________
Author of the "AudioExcite Loudspeaker Design" website
http://www.audioexcite.com
  Reply With Quote
Old 12th July 2012, 11:35 PM   #33
diyAudio Member
 
5th element's Avatar
 
Join Date: Oct 2002
Location: England
Quote:
Originally Posted by gornir View Post
. The DXT tweeter has one of the sharpest cone break-ups I’ve ever measured and it contributes to a rise of about 8 times in the distortion profile for the third-order harmonics at 9kHz.
Indeed and if one played a 9kHz tone through the DXT, the tweeter would generate a third harmonic at 27khz and this would then be amplified by the domes bell mode resonance. We cannot hear this though.

The only way this can be audible in any way would be through the generation of difference tones through IMD. It would be interesting to throw some worst case scenario test signals at the DXT just to see how much of an issue this could potentially be.
__________________
What the hell are you screamin' for? Every five minutes there's a bomb or somethin'! I'm leavin! bzzzz!
  Reply With Quote
Old 13th July 2012, 01:58 PM   #34
diyAudio Member
 
gainphile's Avatar
 
Join Date: Dec 2007
Location: Melbourne the sunny city!
Well I didn't have to wait long. Gotta love Madisound and USPS

Click the image to open in full size.

It was pretty easy to equalise them to flat actively, just a simple notch centered at around 4khz. I had not bothered to fine tune them yet as they are still surface mounted. But my first impression is very clean, neutral sound.

Looks great too!
__________________
http://gainphile.blogspot.com
  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
WTB SEAS Prestige 27TBCD/GB-DXT poler Swap Meet 3 28th September 2011 03:22 AM
SEAS DXT tweeter and integration.. Elbert Multi-Way 1 13th October 2009 11:46 PM
My Seas DXT + SS18W speaker ojg Multi-Way 29 15th January 2009 08:44 PM
FS: Seas 27TBCD-DXT - new waveguide tweeters Tenson Swap Meet 3 8th July 2008 12:53 AM
27TBCD/GB-DXT as an alternative to 27TBFC/G AntM Multi-Way 2 17th June 2008 12:03 AM


New To Site? Need Help?

All times are GMT. The time now is 03:01 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