DCAudioDIY.com

DC Area Audio DIYer's Community
It is currently October 31st, 2024, 8:17 pm

View unanswered posts | View active topics


Board index » DCAudioDIY Main » Project Discussions

All times are UTC - 5 hours [ DST ]



Post new topic This topic is locked, you cannot edit posts or make further replies.  Page 7 of 15
  [ 147 posts ]  Go to page Previous  1 ... 4, 5, 6, 7, 8, 9, 10 ... 15  Next
  Print view Previous topic | Next topic 
Author Message
Stuart Polansky
PostPosted: December 28th, 2018, 3:18 pm 
Offline
User avatar

Joined: December 14th, 2013, 2:19 pm
Posts: 985
Brombo, you have a PM
Top
 Profile  
 
mix4fix
PostPosted: December 28th, 2018, 9:05 pm 
Offline

Joined: June 22nd, 2013, 11:00 am
Posts: 1051
I ordered the rest of the parts.

10 crossover parts
2 bags of polyfill
2 binding posts instead of the spring loaded ones

_________________
I reject your music, and substitute my own.
Top
 Profile  
 
Stuart Polansky
PostPosted: December 29th, 2018, 8:54 am 
Offline
User avatar

Joined: December 14th, 2013, 2:19 pm
Posts: 985
Good job! You won't be sorry. Great pride in turning a pile of parts into a nice sounding finished project.
Top
 Profile  
 
SoundMods
PostPosted: December 29th, 2018, 12:20 pm 
Offline
User avatar

Joined: July 24th, 2015, 4:17 pm
Posts: 1747
Location: Parkville, Maryland
mix4fix wrote:
I ordered the rest of the parts.

10 crossover parts
2 bags of polyfill
2 binding posts instead of the spring loaded ones



Just a note on fill. I found that polyfill is reactive and nowhere near as effective as wool or fiberglass. I know you already ordered the polyfill, but I feel you'll get a better result if you use wool or fiberglass.

_________________
Walt
Top
 Profile  
 
Cogito
PostPosted: December 29th, 2018, 12:54 pm 
Offline

Joined: July 17th, 2016, 6:24 am
Posts: 1126
SoundMods wrote:
mix4fix wrote:
I ordered the rest of the parts.

10 crossover parts
2 bags of polyfill
2 binding posts instead of the spring loaded ones



Just a note on fill. I found that polyfill is reactive and nowhere near as effective as wool or fiberglass. I know you already ordered the polyfill, but I feel you'll get a better result if you use wool or fiberglass.


Fiberglass will not work in this application. Goal of the fill in this application is to dampen the resonances without hindering sound waves passing thru the transmission line. That needs playing around with the density and amount of the fill. Polifill is perfect for adjusting the density.
Top
 Profile  
 
SoundMods
PostPosted: December 29th, 2018, 1:14 pm 
Offline
User avatar

Joined: July 24th, 2015, 4:17 pm
Posts: 1747
Location: Parkville, Maryland
Cogito wrote:
SoundMods wrote:
mix4fix wrote:
I ordered the rest of the parts.

10 crossover parts
2 bags of polyfill
2 binding posts instead of the spring loaded ones



Just a note on fill. I found that polyfill is reactive and nowhere near as effective as wool or fiberglass. I know you already ordered the polyfill, but I feel you'll get a better result if you use wool or fiberglass.


Fiberglass will not work in this application. Goal of the fill in this application is to dampen the resonances without hindering sound waves passing thru the transmission line. That needs playing around with the density and amount of the fill. Polifill is perfect for adjusting the density.


As is fiberglass and wool. ??? Polyfill is reactive -- meaning it does a mediocre job when the goal is to dampen. Stuffing pillows -- you bet. Most speaker manufacturers other than the anal high-end guys use polyfill because it is cheap and does not create issues that OSHA might be worried about.

I am not talking about ridged fiberglass, but the stuff similar to that used for attic insulation. There was a time where fiberglass was the material of choice for U.S. speaker manufacturers and wool the choice of U.K. manufacturers. Wool is still desired to this day -- fiberglass not so much. Fiberglass friable fibers get everywhere and it is always advisable to wear a face mask and clothes you won't mind throwing out if you get frisky with the stuff.

Another material that I found extremely good and easy to work with is raw cotton right off the plant. At one time fabric shops carried it. No more. You still may be able to obtain raw cotton on eBay. Given a choice between raw cotton and the others -- cotton goes to the top of my list.

_________________
Walt
Top
 Profile  
 
tomp
PostPosted: December 29th, 2018, 1:33 pm 
Offline
User avatar

Joined: February 28th, 2013, 3:31 pm
Posts: 1806
Interesting information.

https://stason.org/TULARC/entertainment ... t-wit.html

https://www.diyaudio.com/forums/multi-w ... inets.html

https://www.qtasystems.co.uk/articles/h ... amping.htm
Top
 Profile  
 
brombo
PostPosted: December 29th, 2018, 2:18 pm 
Offline

Joined: July 8th, 2016, 4:34 pm
Posts: 592
For sealed boxes there is this. Don't know of relevance to vented enclosures.

http://bgavinsound.com/Reference/Speake ... hermal.txt
Top
 Profile  
 
mix4fix
PostPosted: December 29th, 2018, 3:15 pm 
Offline

Joined: June 22nd, 2013, 11:00 am
Posts: 1051
When I receive the stuff, how do you install/mount them?

_________________
I reject your music, and substitute my own.
Top
 Profile  
 
tomp
PostPosted: December 29th, 2018, 4:57 pm 
Offline
User avatar

Joined: February 28th, 2013, 3:31 pm
Posts: 1806
These boards are what I used for the egg crossovers. They come in different colors and sizes and make placement of the individual components easy. You can also drill holes at the corners for spacers and screws to mount them inside the speaker cabinets.

https://www.parts-express.com/white-per ... 7--260-190


Attachments:
Mid _ High crossover_small.jpg
Mid _ High crossover_small.jpg [ 317.48 KiB | Viewed 119174 times ]
Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic This topic is locked, you cannot edit posts or make further replies.  Page 7 of 15
  [ 147 posts ]  Go to page Previous  1 ... 4, 5, 6, 7, 8, 9, 10 ... 15  Next

Board index » DCAudioDIY Main » Project Discussions

All times are UTC - 5 hours [ DST ]

Who is online

Users browsing this forum: No registered users and 22 guests

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Switch to mobile style
Powered by phpBB® Forum Software © phpBB Group