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

XO for Vifa PL18WO-08-09 and Vifa XT25TG30-04 MTM
XO for Vifa PL18WO-08-09 and Vifa XT25TG30-04 MTM
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 22nd January 2009, 09:27 PM   #1
knightat83 is offline knightat83  United States
diyAudio Member
 
Join Date: Jan 2009
Default XO for Vifa PL18WO-08-09 and Vifa XT25TG30-04 MTM

I am looking to build a pair of MTMs using the following drivers.


Vifa PL18WO-08-09
http://www.parts-express.com/pe/show...number=297-324

and

Vifa XT25TG30-04
http://www.parts-express.com/pe/show...number=264-555

In a sealed box. These are going to paired with a sub so low end extension is not that important. I have a set of DIY bookshelfs using the PL 17s woofers that I really enjoy so I am fairly set on using the PL 18s as my woofers but would be willing to consider a different tweeter if something better is available around the same price range.

I this woofer/tweeter combo would work well with a crossover of about 2000-2500 hertz from what i have read.

I am not skilled enough to write my own crossover network and was wondering if anyone knew of a project with a published XO design I could use or if someone could help me out with designing something custom for this task. In addition I am slightly worried about the impedance dipping much below 4 ohms as I am using a panasonic xr55 av receiver (yes I know this should be replaced soon).

I found this post:
http://www.diyaudio.com/forums/showt...=&pagenumber=1

but i am not sure if this XO would work well with my woofers. Although it seems like it should.

Thanks in advance for any advice or help.
  Reply With Quote
Old 23rd January 2009, 03:20 AM   #2
Dr. Ram is offline Dr. Ram
diyAudio Member
 
Dr. Ram's Avatar
 
Join Date: Jan 2006
Location: Polynomialand
Default Re: XO for Vifa PL18WO-08-09 and Vifa XT25TG30-04 MTM

Quote:
Originally posted by knightat83
In a sealed box. These are going to paired with a sub so low end extension is not that important.
would be willing to consider a different tweeter if something better is available around the same price range.
In addition I am slightly worried about the impedance dipping much below 4 ohms
knightat83,

- One element you should think about is the alignment of the sealed box. I suggest you go for a box alignment that provides greater damping such as a Bessel alignment because (i) you have a sub and (ii) if your amp output impedance /damping factor is an issue
- Try thinking about putting your woofers in series rather than in parallel. Many will cry foul at that suggestion but it's not as bad as it may sound. Then use a higher impedance tweeter with or without an L-pad, and your impedance issues will cease to be.
  Reply With Quote
Old 23rd January 2009, 09:25 AM   #3
andrew01 is offline andrew01  Australia
diyAudio Member
 
Join Date: May 2003
Location: Adelaide Southern Suburbs
There is a German website called ASE - Acoustic Systems Engineering - who have lots of DIY Vifa designs , some probably use those drivers - worth having a look...
  Reply With Quote
Old 23rd January 2009, 09:40 AM   #4
andrew01 is offline andrew01  Australia
diyAudio Member
 
Join Date: May 2003
Location: Adelaide Southern Suburbs
Forgot to add the URL

http://www.vifa.de/standbox.html

  Reply With Quote
Old 23rd January 2009, 10:29 AM   #5
sreten is offline sreten  United Kingdom
diyAudio Member RIP
 
Join Date: Nov 2003
Location: Brighton UK
Hi,

http://www.speakerbuilder.net/web_fi...ct/erosmk2.htm

Is a possible place to start for a PL18 MTM. As stated in the linked
to post the XT25 is not the first choice tweeter for an MTM, Seas ?

/sreten.
  Reply With Quote
Old 23rd January 2009, 10:42 PM   #6
knightat83 is offline knightat83  United States
diyAudio Member
 
Join Date: Jan 2009
After further research I seem to have come to the conclusion that the "Natalie P." MTM (found at the link below) could be a good solution in my budget range.

http://www.htguide.com/forum/showthread.php4?t=13969

I have never heard any of the Dayton Reference Series line but every review I have seen to date gives them very high bang/buck ratings.

The crossover for this design is fairly simplistic compared to the Modula but seems to be a good starting point. At a later date I could possibly upgrade to the Modula crossover

The beauty here is that it seems like a good foundation for me to build from without being significantly over my head to start with.

Does anyone have strong opinions for or against this design? Right now my cabinets are sealed but I built 3 extra rear panels so I can still easily port them.
  Reply With Quote
Old 24th January 2009, 08:51 AM   #7
andrew01 is offline andrew01  Australia
diyAudio Member
 
Join Date: May 2003
Location: Adelaide Southern Suburbs
Ohh I assumed you already *had* those vifa drivers.....
  Reply With Quote

Reply


XO for Vifa PL18WO-08-09 and Vifa XT25TG30-04 MTMHide 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
Vifa PL18WO-09-08, MTM Jolted_Chicken Multi-Way 17 22nd July 2014 12:51 AM
Group Buy: Vifa XT25TG30-04 Aegeon Group Buys 20 27th February 2011 05:45 AM
Vifa Pl18wo Or Xg18wh bowdown Multi-Way 11 20th May 2007 01:58 AM
a sub from vifa pl18wo-17-4? leadbelly Multi-Way 0 3rd May 2003 10:49 PM


New To Site? Need Help?

All times are GMT. The time now is 12:51 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 16.67%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio
Wiki