Custom DIY 6.5" Fullrange Driver - diyAudio
Go Back   Home > Forums > Loudspeakers > Full Range
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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 10th October 2016, 06:14 AM   #1
ghemml is offline ghemml  Singapore
diyAudio Member
 
ghemml's Avatar
 
Join Date: Sep 2010
Default Custom DIY 6.5" Fullrange Driver

Been playing around with some of the spare neo magents I have got from a previous purchase for my ribbon tweeter.

So came out with a 6.5" fullrange custom built without really burning my pocket.

Click the image to open in full size.
Click the image to open in full size.
Sizing of the motor using Neo Magnets

Click the image to open in full size.
Click the image to open in full size.
AutoCAD design and sending for fabrication

Click the image to open in full size.
Click the image to open in full size.
The Hamburgers looking motor
  Reply With Quote
Old 10th October 2016, 06:17 AM   #2
ghemml is offline ghemml  Singapore
diyAudio Member
 
ghemml's Avatar
 
Join Date: Sep 2010
Click the image to open in full size.
Initially I used GR10 phenolic for the damper... but the flexural strength just too small... end up I use LE phenolic sheets

Click the image to open in full size.
Design and fabricating the Basket
  Reply With Quote
Old 10th October 2016, 06:18 AM   #3
ghemml is offline ghemml  Singapore
diyAudio Member
 
ghemml's Avatar
 
Join Date: Sep 2010
Click the image to open in full size.
Designing a mold and jig for the folding of the cone

Click the image to open in full size.
Click the image to open in full size.
Gluing up the cone and the voice coil using hemp paper
  Reply With Quote
Old 10th October 2016, 06:19 AM   #4
ghemml is offline ghemml  Singapore
diyAudio Member
 
ghemml's Avatar
 
Join Date: Sep 2010
Click the image to open in full size.
Add in the whizzer cone and the overall weight (6.3grams)

Click the image to open in full size.
Close up on the Phenolic damper (Spider)

Last edited by ghemml; 10th October 2016 at 06:29 AM.
  Reply With Quote
Old 10th October 2016, 06:25 AM   #5
ghemml is offline ghemml  Singapore
diyAudio Member
 
ghemml's Avatar
 
Join Date: Sep 2010
Default Some quick measurement I made

Click the image to open in full size.

Click the image to open in full size.
  Reply With Quote
Old 10th October 2016, 06:35 AM   #6
ghemml is offline ghemml  Singapore
diyAudio Member
 
ghemml's Avatar
 
Join Date: Sep 2010
Default Test run using a LM3886

https://www.youtube.com/watch?v=CQNzTsXtmkA
  Reply With Quote
Old 10th October 2016, 07:15 AM   #7
diyAudio Member
 
Join Date: Feb 2016
Location: 020
wow, this is next level stuff! Keep us posted.
  Reply With Quote
Old 10th October 2016, 04:43 PM   #8
xrk971 is offline xrk971  United States
diyAudio Member
 
xrk971's Avatar
 
Join Date: Oct 2012
Location: Metro DC area
Beautiful work! The motor parameters came our quite nicely. Are the motor and magnets held together with self magnet force or did you also bond with glue? I like the spider - I have often thought the whole speaker sans magnet and motor and VC could be 3D printed in one shot (including cone). The sound is nice - do you have any measurements in a sealed box or large baffle so we can see frequency response?

Last edited by xrk971; 10th October 2016 at 05:05 PM.
  Reply With Quote
Old 10th October 2016, 04:56 PM   #9
diyAudio Member
 
Join Date: Nov 2004
Location: Rakkestad
Send a message via MSN to Snickers-is
Cool stuff!

Did you make a T/S simulation or measurement?
__________________
Live sounds better than HiFi.
  Reply With Quote
Old 10th October 2016, 05:52 PM   #10
ghemml is offline ghemml  Singapore
diyAudio Member
 
ghemml's Avatar
 
Join Date: Sep 2010
Quote:
Originally Posted by Lohengrimas View Post
wow, this is next level stuff! Keep us posted.
Will do

Quote:
Originally Posted by xrk971 View Post
Beautiful work! The motor parameters came our quite nicely. Are the motor and magnets held together with self magnet force or did you also bond with glue? I like the spider - I have often thought the whole speaker sans magnet and motor and VC could be 3D printed in one shot (including cone). The sound is nice - do you have any measurements in a sealed box or large baffle so we can see frequency response?
The motor and the magnets are hold up by the magnetic force and the groves to prevent them moving to the pole piece. You can see in the CAD cross section picture below:

Click the image to open in full size.

To put in the N42 ring magnet for assembly is quite a Nightmare. You can imagine the inner ring of the magnet keep getting attracted to the pole piece.

3D printing might be handy for fabricating the speaker basket, but that's limited to plastic 3D printing at the moment.

The damper is one of the main design(I believe), as I find the damping capability is somewhat better than normal conventional speaker damper(spider). It returns to equilibrium much faster, from observation when I inject low freq music.

Another importance to the design the paper voice coil, the sound impression has more natural feel to it with a blend of fostex + lowther texture. But downside is they can get destroyed easily as seen in lowther fullrange.

I will be planning to measure up after my phase plug and binding post terminal is machined out by this week. And probably do up a tapper tube enclosure for it.

Quote:
Originally Posted by Snickers-is View Post
Cool stuff!

Did you make a T/S simulation or measurement?
Its measured using WT3, I did a full TS measurements but since I missing the phase plug and the lead wires are still dangling outside performing the measurements might not be fully accurate. But for now the Fs, Qes, Qms and few other TS parameters are pretty accurate.

The WT3 test you see if just to help me measure the pairs up to see if there is any mismatch.

Last edited by ghemml; 10th October 2016 at 05:55 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
Your favorite 2" Fullrange driver? mayhem13 Full Range 5 11th March 2015 11:19 PM
Making my own custom low tech 12" fullrange from an old Akai woofer:) impuls60 Full Range 3 6th December 2011 12:19 AM
Pioneer 4.5 fullrange driver ("A11"): $20/each gychang Swap Meet 0 4th September 2011 09:52 PM
Interesting Cheap - possible "fullrange" eff. driver ScottG Full Range 1 28th March 2006 12:28 AM
DIY fullrange driver? Nappylady Full Range 24 25th February 2004 03:17 PM


New To Site? Need Help?

All times are GMT. The time now is 08:28 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2
Wiki