The One and Only Full Range AMT - 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 13th December 2009, 05:57 PM   #31
49 - for the 18th time
diyAudio Member
 
c2cthomas's Avatar
 
Join Date: Oct 2006
Location: Near "Music City" (Nashville Tennessee)
Quote:
Originally Posted by RayCtech View Post
listening is great as long as proper equipment are used.
Uh-oh - nooooowwwww I'm in trouble

SWMBO is not going to be happy with me nailing up several layers of sheet rock and MDF onto "her ceiling" - let alone adding to the "electronics stuff".

Congrat's on the response curves - they look pretty nice for "in-room" measurements
__________________
DIY audio can be expensive but getting to see things go up in smoke - that's priceless!!!! ..... "whatever - call it brainfart of Mighty ZM"
  Reply With Quote
Old 14th December 2009, 01:20 PM   #32
diyAudio Member
 
Join Date: Mar 2008
Location: Uzhgorod
measurement looks like some wave guide adding efficience in region of lowmids will be usefull?
  Reply With Quote
Old 15th December 2009, 09:29 AM   #33
Account disabled at member's request
 
Join Date: Sep 2007
Location: Multiple...
Quote:
Originally Posted by Charcoal View Post
measurement looks like some wave guide adding efficience in region of lowmids will be usefull?
A wave-guide are designed and will be used when the AMT (as a dipol) will be used as a midrange / tweeter and crossed over at 100 - 300Hz.

The measurement was taken at 75 degrees off-axis in a reflective room, and in a horn enclosure designed for five AMTs.
The four remaining "holes" are not properly acoustically sealed and interferes and give some dB misreading (both plus and minus).
The measured results are only coarse indications of how the AMT operates in general...

StigErik:
I measured the AMT in free air without a baffle and it the drops in level from 1500Hz even if voices still are relatively "good" - much better than expected.
  Reply With Quote
Old 15th December 2009, 09:51 AM   #34
diyAudio Member
 
Join Date: Mar 2008
Location: Uzhgorod
when they will be availble for purchase?
  Reply With Quote
Old 15th December 2009, 10:34 AM   #35
Account disabled at member's request
 
Join Date: Sep 2007
Location: Multiple...
Quote:
Originally Posted by Charcoal View Post
when they will be availble for purchase?
Good question...

The AMT have caused much more attention than I had expected and I believe your question need to be answered at a later point of time...
  Reply With Quote
Old 15th December 2009, 11:05 AM   #36
diyAudio Member
 
Join Date: Mar 2008
Location: Uzhgorod
I have read a lot of opinions claiming that making AVT big for fullrange causes unacceptable distirsions .. did you manage to vercome that?

Really interested in that but knowing norwegian selfcosts little bit afraid of price))
  Reply With Quote
Old 15th December 2009, 12:59 PM   #37
Account disabled at member's request
 
Join Date: Sep 2007
Location: Multiple...
Quote:
Originally Posted by Charcoal View Post
I have read a lot of opinions claiming that making AVT big for fullrange causes unacceptable distirsions .. did you manage to vercome that?

Really interested in that but knowing norwegian selfcosts little bit afraid of price))
As I designed the AMT for this bandwidth, and used my own variation of the principles of operation and my own implementation after my own calculations and with materials after my own evaluations - I really do not know why other AMTs effectively do not work properly below 1 - 2kHz.

As I only flipped through the patent papers to verify the most basic principles of operation and was not "bothered" by how other AMTs are designed I believe I was having the needed "freedom" to realize my own goals.

The measured distortion with the current builds are perfect down to 300Hz, and from 300Hz and down to 100Hz there are a rise of 5dB, and from 100Hz and down to 20Hz there are a rise of another 10dB in distortion.
This increase in distortion are related to the physical abilities of the AMT and due to the falling SPL level.

To keep the distortion level down to the perfect level at lower frequencies - then 4 AMTs are need to cover the frequencies below 300Hz etc..
  Reply With Quote
Old 15th December 2009, 01:04 PM   #38
Account disabled at member's request
 
Join Date: Sep 2007
Location: Multiple...
.

Last edited by RayCtech; 15th December 2009 at 01:06 PM. Reason: The reply was posted twice..
  Reply With Quote
Old 15th December 2009, 02:04 PM   #39
diyAudio Member
 
Join Date: Mar 2008
Location: Uzhgorod
even using one crossed over with some array of light weight cone woofers - could be greate design.
  Reply With Quote
Old 15th December 2009, 03:49 PM   #40
Account disabled at member's request
 
Join Date: Sep 2007
Location: Multiple...
I expect there will be questions regarding the practical usability of the AMTs.

When only on AMT are used pr. channel with an enclosure or suitable baffle and run with the full frequency spectrum, 65 to 70 dB average and 90dB peak in the listening position are possible without any kind* of distortion or noise.
This are when using a completely DC coupled system.

*meaning I cannot hear any distortion or noise

Last edited by RayCtech; 15th December 2009 at 03:59 PM.
  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
Frequency range of the human voice & full range center channel speakers jwmbro Multi-Way 31 20th January 2008 04:07 PM
5.25 full range boxcustom Full Range 0 20th March 2007 10:33 PM
Full Range jered22 Full Range 2 13th January 2005 12:16 AM


New To Site? Need Help?

All times are GMT. The time now is 03:29 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