isobaric sub with scanspeak 25W8565-00 - diyAudio
Go Back   Home > Forums > Loudspeakers > Subwoofers

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 23rd May 2010, 03:44 PM   #1
diyAudio Member
 
Join Date: Feb 2003
Location: deventer
Default isobaric sub with scanspeak 25W8565-00

hi there
I'm looking for a isobaric design with two 25W8565-00 's
There were some but websites are down....
Can anybody help in some way?
thanks
__________________
I hate carryable audio-equipment!
  Reply With Quote
Old 24th May 2010, 04:24 AM   #2
diyAudio Member
 
Brett's Avatar
 
Join Date: Jan 2002
It's not much use as a sub; the driver only has 6.5mm of Xmax. Sealed isobaric for Q=0.707 is 52L net, F3 is 35Hz and it runs out of Xmax with 100W/driver at 65Hz.

Ported is even worse in terms of excursion, but has a nice FR. I tried a couple of different volumes but 110L was about the best.

I'd use something different for a sub.
  Reply With Quote
Old 24th May 2010, 09:22 AM   #3
diyAudio Member
 
Join Date: Feb 2003
Location: deventer
thanks Brett
but are those graphs for an isobaric design or just two 25w's in a cabinet?
__________________
I hate carryable audio-equipment!
  Reply With Quote
Old 24th May 2010, 10:01 AM   #4
diyAudio Member
 
Brett's Avatar
 
Join Date: Jan 2002
Isobaric
  Reply With Quote
Old 24th May 2010, 12:03 PM   #5
diyAudio Member
 
Join Date: Feb 2003
Location: deventer
ok! hmm...
not looking that bright indeed.
Maybe I should rethink this project? But I already have those two 25w's.
What else to do with them?
__________________
I hate carryable audio-equipment!
  Reply With Quote
Old 24th May 2010, 12:09 PM   #6
diyAudio Member
 
Brett's Avatar
 
Join Date: Jan 2002
Sell them and use the money to buy useful drivers.
  Reply With Quote
Old 24th May 2010, 12:10 PM   #7
diyAudio Member
 
Join Date: Feb 2003
Location: deventer
BTW, how is it that you calculated 110L. I thought that one should take half of the 'normal' volume for a single driver. I calculated 120L for one unit so shouldn't an isobaric design be around 60ltr?
What did I mis(understand)?
And what are useful drivers?
__________________
I hate carryable audio-equipment!
  Reply With Quote
Old 24th May 2010, 12:29 PM   #8
diyAudio Member
 
Brett's Avatar
 
Join Date: Jan 2002
I tried lots of things, but first I calced a std 4th order tune for a solo driver and got something like 250L, so I halved it. Didn't look any better larger or smaller and going for a small box ported with a low tune doesn't often work as the port becomes too long if you want decently low airspeed.

Try dedicated sub drivers like those from Acoustic Elegance, Exodus, CSS, Fi, Audiopulse etc.
  Reply With Quote
Old 24th May 2010, 05:02 PM   #9
diyAudio Member
 
Join Date: Feb 2003
Location: deventer
Thanks Brett very helpfull
Now you make me do it again! buying more speakers
__________________
I hate carryable audio-equipment!
  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
Has anyone used the Scanspeak D2004/6020-00 tweeter? Face Multi-Way 7 8th February 2011 05:22 PM
stereo subs with scanspeak 25w8565-00 aaronboumans Subwoofers 1 4th February 2009 02:56 PM
ScanSpeak 25W8565-01 or 26W/8861T00 in Push/Pull? HiFiNutNut Multi-Way 0 13th November 2006 11:37 PM
Subwoofer Project with ScanSpeak 25W8565-01 tktran Subwoofers 1 23rd May 2004 05:44 PM
10" scanspeak FS 25w8565-01 Fritz Swap Meet 0 16th October 2002 03:52 AM


New To Site? Need Help?

All times are GMT. The time now is 10:54 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2