opinions on vifa pl18 tl - diyAudio
Go Back   Home > Forums > Loudspeakers > Multi-Way

Multi-Way Conventional loudspeakers with crossovers

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 12th October 2006, 07:11 AM   #1
nebelk is offline nebelk  United States
diyAudio Member
 
Join Date: Nov 2005
Send a message via AIM to nebelk Send a message via MSN to nebelk Send a message via Yahoo to nebelk
Default opinions on vifa pl18 tl

after quite a few different design ideas (firstly a ported bookshelf w/ help from madisound) i think i have finally arrived at a design i want to build.

i wanted to use a single sheet of 3/4" mdf so that limited the size and shape, but i think (hope) i arrived at pretty good compromise

also, how much tweeking must be done to use the crossovers originally designed for the ported box in the new set-up?

please let me know what you think.

drivers......
pl18wo-04
d27tg35
Attached Images
File Type: jpg vifa.jpg (27.6 KB, 919 views)
  Reply With Quote
Old 12th October 2006, 09:29 PM   #2
nebelk is offline nebelk  United States
diyAudio Member
 
Join Date: Nov 2005
Send a message via AIM to nebelk Send a message via MSN to nebelk Send a message via Yahoo to nebelk
i have tried to model this using mjk's worksheets, but i dont know how to save the graphs to post them,
and i am not quite convinced i modeled them correctly anyway.

so if anyone could model it or tell me how to post them it'd be appreciated.

and i am working on drawing up the crossover so hopefully someone can take a look and see if it is ok.

thanks
  Reply With Quote
Old 12th October 2006, 09:58 PM   #3
diyAudio Member
 
vinylkid58's Avatar
 
Join Date: May 2005
Location: Victoria, B.C.
You can copy/paste your plots in Mathcad into another program, even MS Paint will work. Then you can save the graphs as .JPEG etc.

Jeff
  Reply With Quote
Old 12th October 2006, 11:41 PM   #4
diyAudio Member
 
Join Date: Nov 2005
I would expect the original xo frequency to be high enough that the cabinet design would not affect it. Most of the effect of the cabinet design would be in the low bass, although there might be a secondary effect depending on whether the original xo was designed with a baffle step, and if you've changed the cabinet width or tweeter position on the faceplate.
  Reply With Quote
Old 13th October 2006, 02:35 AM   #5
nebelk is offline nebelk  United States
diyAudio Member
 
Join Date: Nov 2005
Send a message via AIM to nebelk Send a message via MSN to nebelk Send a message via Yahoo to nebelk
the origional crossover is below, i think bsc was taken into consideration, but i dont know for sure. if it was designed in, is it appropriate for an 8" baffle?

also, could someone tell me the approx crossover point and slopes.

i am working on the mjk sims so hopefully i can get them up shortly.

thanks
Attached Images
File Type: jpg crossover.jpg (30.0 KB, 788 views)
  Reply With Quote
Old 13th October 2006, 03:16 AM   #6
nebelk is offline nebelk  United States
diyAudio Member
 
Join Date: Nov 2005
Send a message via AIM to nebelk Send a message via MSN to nebelk Send a message via Yahoo to nebelk
here is the mjk simulation done using the old(free) offset version
Attached Images
File Type: jpg sim.jpg (27.6 KB, 739 views)
  Reply With Quote
Old 13th October 2006, 03:28 AM   #7
diyAudio Member
 
elfranche's Avatar
 
Join Date: Dec 2004
Location: Canada
I've used the D27 for some years. very nice..
  Reply With Quote
Old 18th October 2006, 06:27 AM   #8
nebelk is offline nebelk  United States
diyAudio Member
 
Join Date: Nov 2005
Send a message via AIM to nebelk Send a message via MSN to nebelk Send a message via Yahoo to nebelk
ok, can someone tell me if the first crossover i posted looks correct, or if the one below looks better............
Attached Images
File Type: jpg crossover1.jpg (33.0 KB, 670 views)
  Reply With Quote
Old 18th October 2006, 04:52 PM   #9
diyAudio Member
 
Join Date: Aug 2006
Quote:
Originally posted by elfranche
I've used the D27 for some years. very nice..
I used to like it as well until I started running into so many bad ones that I don't dare buy D27's anymore, and this applies to all of them (15's, 35's and 45's). The risk of having problems is simply too high. By "problems" I mean units that measure way outside their published specs and don't even come close to matching with one another. It's not a question of tolerances, they're just plain bad. I know Vifa supposedly fixed problems with the D27 but I've had problems with the "fixed" ones as well so I have my doubts. I'm very close to thinking that the D27 line was poorly designed, plain and simple. This being said I have no complaints about other Vifa tweeter models, I especially appreciate the D25 and D26 but unfortunately these are hard to come by these days. But on the bright side of things, is there are better quality tweeters that sell for less (at least in North America) available to DIY'ers now, such as Hi-Vi units.

As for the PL18, in my personal experience it's an excellent driver. Pricey for a Vifa but it's in a different league than other Vifas and considering its quality it's a good value. Chinese made drivers of similar quality don't sell for much less, when they aren't more expensive. This is just my personal opinion, based on my own listening. The PL line is quite new and I haven't seen any thorough reviews of those drivers yet. I sure would like to.
  Reply With Quote
Old 20th October 2006, 12:11 AM   #10
nebelk is offline nebelk  United States
diyAudio Member
 
Join Date: Nov 2005
Send a message via AIM to nebelk Send a message via MSN to nebelk Send a message via Yahoo to nebelk
please disregard the second crossover i posted,

I beleive the first one is correct and is a second order 12db slope with an L-pad on the tweeter and a Zobel circuit on the woofer.

Is this correct?

any help would be greatly appreciated
  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
Vifa speakers: 2-xt25 4-pl18 Bryan G. Swap Meet 14 2nd November 2008 04:06 PM
Must sell vifa PL18 $20 Vifa pl tweeters $30 colwaiting Swap Meet 0 20th March 2008 03:53 PM
New VIFA (pl18 + xt25) project mrWagner Multi-Way 7 3rd April 2007 12:26 PM
Two Vifa PL18 drivers in 45 liters box OK? andy2 Multi-Way 13 8th September 2006 04:26 AM
Any one used Vifa PL18 225/8 version? JC Fardo Multi-Way 11 27th May 2003 02:34 AM


New To Site? Need Help?

All times are GMT. The time now is 12:52 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