Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

A Study of DML's as a Full Range Speaker
A Study of DML's as a Full Range Speaker
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 5th August 2020, 03:07 AM   #2191
Bobbb is offline Bobbb
diyAudio Member
 
Join Date: Apr 2020
Like many people here, I saw the Tech Ingredients videos then found this thread. After a lot of studying and procrastinating, I finally took the plunge.

I went with 2 x4í x ľĒ sheets of birch plywood. I liked how the wood panels sounded in the TI video. Besides itís impossible to get a 4x8 sheet of XPS into my Corolla. Other than drilling a couple holes in them so I could put wire through them to suspend them, I havenít done any modifications to the boards such as curving the corners.

The first exciters I attached were the DAEX 25FHE-4. They are 4 ohm and I have an 8 ohm receiver so I put 4 ohm resistors in between the amp and the exciters. The panels sounded like a good TV speaker. Nothing to write home about. Out of curiosity, I took the resistors out of the circuit and tried the panels again. The sound was worse so I put the resistors back.

Then I added a DAEX 30HESF-4 to each panel. Since I still had the resistors in place I hooked up the exciters in parallel. Adding a second exciter to each panel improved the sound quality immensely.
Placement of all the exciters was determined by hooking them up and sliding them around on the panel until I found the most pleasing sound.

I affixed the exciters to the board with a 3M double-sided tape that is not as strong as the tape that comes on the exciters. This allows me to move things around until I settle on the excitersí final placement.

The midrange can be pretty thin but itís not too objectionable. When I listen to videos of people just talking, the voices sound less present than using my 90's era Advent Heritage speakers. This could be the result of room response Spedge mentioned in the previous comment.

String bass sounds OK as long as the player stays away from the lowest notes. Something with a very pronounced and thumpy bass like some Taylor Swift and even some 60s music like The Doors, Hermanís Hermits or Kinks causes such unpleasant buzzing it sounds like the exciters are going to self-destruct. A subwoofer would be nice.

I also suspect burn-in is happening. The sound seems to be improving the more I use the speakers.

Thereís certainly more work to do but thatís my story so far.

Bob
  Reply With Quote
Old 5th August 2020, 05:48 PM   #2192
spedge is offline spedge  United Kingdom
diyAudio Member
 
Join Date: Sep 2009
Hi Bob.
An unpleasant buzzing doesn't sound good, are the lead out cables unbalancing the exciters causing them to wobble as they are vibrating in and out.
Are you overdriving them in the low end,same as above.
If it is the panel buzzing you could have a loose ply.
Best way to trace the buzz would be maybe get a 3ft or so of garden Hose or something similar, one end to your ear and the other end to move around where you think the buzzing is coming from.
The wires must never touch the panel obviously.
Hopefully the garden Hose will do the trick?
All the best
Steve.
  Reply With Quote
Old 5th August 2020, 07:36 PM   #2193
moldie is offline moldie  South Africa
diyAudio Member
 
Join Date: Jul 2020
Location: Cape Town
Quote:
Originally Posted by Bobbb View Post
Then I added a DAEX 30HESF-4 to each panel. Since I still had the resistors in place I hooked up the exciters in parallel. Adding a second exciter to each panel improved the sound quality immensely.
Bob
Hi Bob, you can hook the exciters up in series and omit the resistors. That will present an impedance of 8 ohm to your amplifier.
  Reply With Quote
Old 6th August 2020, 12:28 AM   #2194
57buick is offline 57buick  United States
diyAudio Member
 
57buick's Avatar
 
Join Date: Aug 2020
Location: Albany, OR
Im experimenting with 18x24 canvas from the art store. I coated the back with PPG gripper arylic primer and also used the gripper to paste a circle of 3 ply birch to back to epoxy the exciter too. Just holding the exciter on there by hand sounds great. Once this drys tomorrow Ill try hooking them up and get the full effect and see where they are at.

Im thinking im gonna try a set with 2 exciters so I can wire them in series for my 8ohm receiver.

I can't decide though should I paste them on 2 separate pieces of wood or just one longer piece of wood?
Attached Images
File Type: jpg back coated.jpg (895.2 KB, 160 views)
File Type: jpg primer sealer.jpg (765.0 KB, 153 views)
  Reply With Quote
Old 6th August 2020, 10:22 AM   #2195
spedge is offline spedge  United Kingdom
diyAudio Member
 
Join Date: Sep 2009
57buick.
I used pva ,2mm bulsa ply 6x4inch ,the frame was about 18x12inches,the panel was placed in the centre of the picture frame,the exciter was slightly offset on the ply ,not sure this was necessary,as the canvas would dampen the panel anyway ?and having everything centrally mounted would balance the canvas ?
I covered the whole panel canvas in thinned pva ,this helped stiffen the canvas and also tightened the surface through shrinkage .
I did also cover the front surface up to an inch from the fame in cascamite which made the surface very rigid ,but over time it cracked badly and ruined the panel.
I could do a recording of the panel to give you an idea what it sounds like but it might buzz a bit?
Steve
  Reply With Quote
Old 6th August 2020, 12:43 PM   #2196
sucra2 is offline sucra2  England
diyAudio Member
 
Join Date: Jun 2020
Default Quality Sound

Good day folks


Firstly, would like to thank this thread for giving me inspiration and guidance!
Ok, Just returned to the UK needing a new sound system had my eye on this for over a year now. But just couldnít part with that cash. I stumbled on TI YouTube channel and this was the project for me..


Bought 2 Dayton Audio DAEX30HESF two bits of Birch spray varnished attached them and was blown away instantly, the way the music filled the room was and experience of its self. Not to mention family members saying ď It sounds like the piano is in the roomĒ.


As Iím a lover of heavy reggae the DAEX30HESF struggled to cope in this environment, so I narrowed the problem down to excessive movement when introduced to bass.



18Ē Active Sub added


EQ added (with sub out)


Better but still too much wobble lower mids


XO added


Delivered a lot more versatility to my set up, but I wanted more depth at higher volumes.


So I found these 100 watt monsters

Click the image to open in full size. l.jpg (79.1 KB)




Click the image to open in full size.
Attached them to a naked bit a ply and it was quite disappointing hollow tinny still no depth.
My 60 watt max amp couldnít drive them


250 watt per channel amp added


With the XO and EQ onboard sound manipulation was easy. However, there was a hum coming from the naked boards? You pros call it resonance, so I didnít varnish or paint wanted an easy fix so I went for self-adhesive vinyl.


Now I have a crystal-clear PA system (for a fraction of the cost) that fills the whole house with music regardless of room upstairs or down.


Handles any music you throw at it adding a depth of sound that most donít even know was there.


The best bit is that my two main speakers look like Ö.. See for yourselves

Click the image to open in full size. speaks.jpg (86.7 KB)
Click the image to open in full size.
Attached Images
File Type: jpg l.jpg (79.1 KB, 105 views)
File Type: jpg speaks.jpg (86.7 KB, 118 views)

Last edited by sucra2; 6th August 2020 at 12:57 PM. Reason: No photos
  Reply With Quote
Old 6th August 2020, 05:31 PM   #2197
spedge is offline spedge  United Kingdom
diyAudio Member
 
Join Date: Sep 2009
Sucra2.
Wow !where did you find those exciters can you give more information on them.
They are a bit overkill for me as I only at the moment use small panels with 10watt exciters,but in the future, who knows.
Also how about some pictures to show how you have mounted them if that's OK.
Steve
  Reply With Quote
Old 6th August 2020, 05:40 PM   #2198
spedge is offline spedge  United Kingdom
diyAudio Member
 
Join Date: Sep 2009
Sacra2.
Blimey!
Diamondboxx, I wouldn't want to be the one carrying that down the beach .
Should rename it the coronary!
Steve
  Reply With Quote
Old 6th August 2020, 06:08 PM   #2199
kaptajnThomsen is offline kaptajnThomsen  Denmark
diyAudio Member
 
Join Date: Jan 2020
Location: Copenhagen
Sucra2, I'm happy you arrived at a setup you are satisfied with!
Am i correct in assuming this exciter is the one you used: 50-100W Powerful 4/8ohm Flat Panel Exciter Sound Exciter Speaker - Dongguan Dason Electric Co., Ltd. - ecplaza.net
?
Beautiful speakers! Would you care to share some more details on build and materials? Perhaps even a few more photos of the build?
Cheers
  Reply With Quote
Old 6th August 2020, 08:20 PM   #2200
sucra2 is offline sucra2  England
diyAudio Member
 
Join Date: Jun 2020
kaptajnThomsen


The build was very simple as I have no power tools or electronic meters.


This thread gave me the idea then I left the rest to intuition and creativity
I had a vision of what I wanted to achieve and set about doing it.



My method was the bog standard method, including nails and fishing wire. However, the vinyl thing happened because I didn't want to paint or spray....


I am very much an eclectic when it comes to music so I would recommend EQ XO to have complete control of the sound to tailor it to how you like it..


P.s
Sitting in that chair gives you a feeling of wearing headphone


I have another pair of the big exciters if anyone needs a set pm me


Cheers


S2
  Reply With Quote

Reply


A Study of DML's as a Full Range SpeakerHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Full Range Voice Range single speaker and enclosure loninappleton Full Range 23 8th May 2014 11:14 PM
Proposal for a full range speaker radio Full Range 20 23rd April 2014 05:03 PM
Design Study: Full Range Line Array Dumbledog Multi-Way 5 27th October 2013 12:45 PM
Full range speaker package. perceptionchanges Swap Meet 1 15th July 2013 03:08 AM
Full range active speaker zebra100 Full Range 10 24th August 2009 11:28 AM


New To Site? Need Help?

All times are GMT. The time now is 12:23 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright ©1999-2020 diyAudio
Wiki