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

Alpair 6M for Cyburgs Needle / BR M.A. Design
Alpair 6M for Cyburgs Needle / BR M.A. Design
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 6th February 2018, 06:14 PM   #61
grahamgraham is offline grahamgraham  United Kingdom
diyAudio Member
 
grahamgraham's Avatar
 
Join Date: Oct 2016
Location: London
I like the sound of a big puffy mass...


OK, I will try on the weekend to remove the old wadding and insert newer fluffier masses. Tho, I wonder if it would be beneficial to start again with ply?

Quote:
Originally Posted by planet10 View Post
The structure you want is no structure… one big puffy mass.

Here is what 40g of acoustastuff looks packaged/teased

Click the image to open in full size.

dave
  Reply With Quote
Old 6th February 2018, 06:32 PM   #62
chrisb is offline chrisb
diyAudio Member
 
Join Date: Aug 2002
Location: victoria BC
Don't look here for an argument against using decent Baltic Birch plywood. A trick of another designer of similarly configured enclosures - and I think Scott wouldn't mind saying one that's been around for decades - would be to make the rear panel removable on cleats to allow easy access to adjust amount & distribution of fill.

And even on something as compact as these, a little bracing never hurts
Attached Images
File Type: jpg 7.3 Penils MarKenT 003.jpg (278.4 KB, 72 views)
__________________
kinda burnt out - taking a break

Last edited by chrisb; 6th February 2018 at 06:35 PM.
  Reply With Quote
Old 6th February 2018, 06:43 PM   #63
grahamgraham is offline grahamgraham  United Kingdom
diyAudio Member
 
grahamgraham's Avatar
 
Join Date: Oct 2016
Location: London
I'm starting to regret my shortcuts!

If I add cleats surely I will change the cross-sectional area and volume of the design, tho?

Quote:
Originally Posted by chrisb View Post
Don't look here for an argument against using decent Baltic Birch plywood. A trick of another designer of similarly configured enclosures - and I think Scott wouldn't mind saying one that's been around for decades - would be to make the rear panel removable on cleats to allow easy access to adjust amount & distribution of fill.

And even on something as compact as these, a little bracing never hurts
  Reply With Quote
Old 6th February 2018, 07:05 PM   #64
grahamgraham is offline grahamgraham  United Kingdom
diyAudio Member
 
grahamgraham's Avatar
 
Join Date: Oct 2016
Location: London
I just had a thought... (Danger zone)

If I jigsaw out a very straight rectangle from the rear I could use the cut out and mount it to another panel so it could fit back in being secured by screws around the edge. Poorly doodled image attached.

I could put foam tape on the seems.

Quote:
Originally Posted by chrisb View Post
Don't look here for an argument against using decent Baltic Birch plywood. A trick of another designer of similarly configured enclosures - and I think Scott wouldn't mind saying one that's been around for decades - would be to make the rear panel removable on cleats to allow easy access to adjust amount & distribution of fill.

And even on something as compact as these, a little bracing never hurts
Attached Images
File Type: jpg image.jpg (526.4 KB, 70 views)
  Reply With Quote
Old 6th February 2018, 07:49 PM   #65
chrisb is offline chrisb
diyAudio Member
 
Join Date: Aug 2002
Location: victoria BC
I don't think the slight decrease in total CSA / volume from adding cleats wouldn't be significant enough, but if concerned, your idea could certainly work. The cleats on Pensils above were 18mm square, and they also incorporated closed cell foam weatherstripping tape - not shown in the photo.
__________________
kinda burnt out - taking a break
  Reply With Quote
Old 9th February 2018, 02:37 PM   #66
grahamgraham is offline grahamgraham  United Kingdom
diyAudio Member
 
grahamgraham's Avatar
 
Join Date: Oct 2016
Location: London
I have reassessed the fluffy mass and plumped for a fluffier filler. Hopefully once I have this in the issues will be solved.

I listened to the port very carefully with my ear to it and I could hear clear vocals. I guessing that once I get the stuffing right it will have a knock on effect to the other frequencies?

When listening to TV with them voices are very boxy and resonant with a dip somewhere in the upper mid (?).
Attached Images
File Type: jpg image1.JPG (489.4 KB, 46 views)
  Reply With Quote
Old 9th February 2018, 06:13 PM   #67
planet10 is online now planet10  Canada
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Alpair 6M for Cyburgs Needle / BR M.A. Design
The pipe produces a ripple train. You want to preserve the lowest one and get rid of the rest. The restricted terminus, driver off-set and damping are all tools to create the low pass filter at the terminus.

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote

Reply


Alpair 6M for Cyburgs Needle / BR M.A. DesignHide 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
Cyburgs Needle kit ebijma Full Range 5 13th October 2007 11:53 AM
Cyburgs-Needle and Cyburgs-Pipe for FRS 8 Cyburgs Multi-Way 20 2nd October 2007 09:24 PM
Cyburgs-Needle using W3-315SC mariusn Full Range 35 27th January 2007 06:56 PM


New To Site? Need Help?

All times are GMT. The time now is 06:19 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki