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

Multi-Way Conventional loudspeakers with crossovers

The XBush Mark 2. A synergy/Unity horn of spherical proportions
The XBush Mark 2. A synergy/Unity horn of spherical proportions
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 October 2016, 02:14 PM   #1
bushmeister is offline bushmeister
diyAudio Member
 
Join Date: Sep 2012
Default The XBush Mark 2. A synergy/Unity horn of spherical proportions

So I am sure some of you will remember the crazy month earlier this year where I spent a mad few weeks knocking out a really nice 'little' synergy horn using a full range driver (the SB65WBAC25), two 8 inch woofers (SB23NRXS45) and a SOTA CD horn (XT1464) under the expert guidance of Xrk - master of computer simulations!

It ended up having rather good measurements and sound (It is my favorite speaker and I have some rather good ones).

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

The one problem with it was the way it looked...........

Click the image to open in full size.

So, I have spent the last 6 months thinking and planning how I can make this thing look half decent......

This won't be everyone's cup of tea I am sure, and my progress pictures are likely to look fairly poor before it looks better, so bare with me.

CLICK ON IMAGE TO VIEW CORRECT ASPECT RATIO

So take one spherical planter:

Click the image to open in full size.

Usually a sphere shaped enclosure is not great for internal modes. This is due to the overwhelming single internal dimension - the diameter - causing a large resonance. Fortunately, due to the design of a synergy horn - the horn sits right inside the enclosure - subdividing the space up and breaking up any resonances:

Click the image to open in full size.

Try horn for size with a bit of cutting:

Click the image to open in full size.

Strengthen further - just because I can......with two layers of fiberglass, then a 2cm thick layer of structural two part car body filler......

Click the image to open in full size.

make a 3mm aluminium/6mm MDF/3mm aluminium CLD baffle ring:

Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.

take one heavy gauge peony plant support, turn it upsidedown, angle grind off the legs, and spray it black....

Click the image to open in full size.
Click the image to open in full size.

Getting there - nearly finished with the Mark 1 - white box for comparison......
Click the image to open in full size.

Click the image to open in full size.

Last edited by bushmeister; 26th October 2016 at 10:30 AM.
  Reply With Quote
Old 6th October 2016, 02:22 PM   #2
bushmeister is offline bushmeister
diyAudio Member
 
Join Date: Sep 2012
Soooo. Take one 51cm diameter spherical polystone planter....... Volume - 60L.
Attached Images
File Type: jpg IMG_20161006_105213.jpg (289.5 KB, 1103 views)

Last edited by bushmeister; 6th October 2016 at 02:26 PM.
  Reply With Quote
Old 6th October 2016, 02:30 PM   #3
bushmeister is offline bushmeister
diyAudio Member
 
Join Date: Sep 2012
The polystone sphere is about 6kg. It appears to have a hard polystone outer layer, with a 4mm fiberglass inner which is orange. It is fairly light for it's size but very strong - I can sit on the side of it without any deformation.

Cut away rim in two areas to allow 8 inch woofers to slot in....
Attached Images
File Type: jpg IMG_20161006_105139.jpg (311.3 KB, 166 views)
File Type: jpg IMG_20161006_110026.jpg (265.6 KB, 1102 views)
File Type: jpg IMG_20161006_110038.jpg (254.2 KB, 148 views)
  Reply With Quote
Old 6th October 2016, 02:32 PM   #4
xrk971 is online now xrk971  United States
Got Foam?
diyAudio Member
 
xrk971's Avatar
 
Join Date: Oct 2012
Location: Metro DC area
The XBush Mark 2. A synergy/Unity horn of spherical proportions
I see where this is going.... nice

Click the image to open in full size.

For the record, no one was calling your babies ugly.
  Reply With Quote
Old 6th October 2016, 02:35 PM   #5
bushmeister is offline bushmeister
diyAudio Member
 
Join Date: Sep 2012
Next. Strengthen further - just because I can......with two layers of fiberglass, then a 2cm thick layer of structural two part epoxy.......

Sphere now weighs about 15kg and is utterly 'dead' to a knuckle wrap test......
Attached Images
File Type: jpg IMG_20161006_142541.jpg (276.0 KB, 1074 views)
  Reply With Quote
Old 6th October 2016, 02:47 PM   #6
bushmeister is offline bushmeister
diyAudio Member
 
Join Date: Sep 2012
Obviously the horn will need some gentle modification. I will cut back the corners and round them. I will also need a new baffle.

So I have made a cardboard template and plan to cut a 5mm aluminium baffle with sorbothane gasket..
Attached Images
File Type: jpg IMG_20161006_113242.jpg (267.9 KB, 151 views)
File Type: jpg IMG_20161006_113013.jpg (263.1 KB, 136 views)
  Reply With Quote
Old 6th October 2016, 02:53 PM   #7
bushmeister is offline bushmeister
diyAudio Member
 
Join Date: Sep 2012
Quote:
Originally Posted by xrk971 View Post
I see where this is going.... nice
For the record, no one was calling your babies ugly.
X - I know - you are always so polite......but deep down in my heart.....I knew they were hideous.
  Reply With Quote
Old 6th October 2016, 04:38 PM   #8
bushmeister is offline bushmeister
diyAudio Member
 
Join Date: Sep 2012
I will likely spray the aluminium baffle matt black and blend in the wave-guide to make it look uniform.

My plan is to sit the 'globes' on a ring hairpin plant stand like this:
Click the image to open in full size.

Inspiration taken from these:

Click the image to open in full size.
  Reply With Quote
Old 6th October 2016, 04:40 PM   #9
bushmeister is offline bushmeister
diyAudio Member
 
Join Date: Sep 2012
Does anyone know of a nice way of cutting a perfect 40cm diameter circle in 5mm aluminium sheet?!?
  Reply With Quote
Old 6th October 2016, 04:45 PM   #10
chrisb is offline chrisb
diyAudio Member
 
Join Date: Aug 2002
Location: victoria BC
CNC water jet / laser - the water jet will leave some minor burring, but that'd easily be remedied

sometimes it pays to have tricky work done elsewhere
__________________
Retired from active DIY
  Reply With Quote

Reply


The XBush Mark 2. A synergy/Unity horn of spherical proportionsHide 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
unity/synergy horn my turn charlie2 Multi-Way 4 15th March 2016 10:16 PM
Questions on Synergy/Unity Horn rb132333 Multi-Way 26 9th October 2015 08:49 PM
synergy/unity horn; Can this be done as a 2 way design? gafhenderson Multi-Way 19 27th November 2013 02:52 AM
Unity/Synergy horn 454Casull Multi-Way 9 10th June 2013 05:35 PM
why not Tractrix for Synergy/Unity horn ? Bigun Multi-Way 1 6th May 2012 03:28 AM


New To Site? Need Help?

All times are GMT. The time now is 08:53 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki