Enclosure for Vifa 4" midrange driver? - diyAudio
Go Back   Home > Forums > General Interest > Car Audio

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 1st March 2007, 05:53 PM   #1
diyAudio Member
 
Join Date: Jul 2003
Location: maryland, USA
Send a message via AIM to eRiCdWoNg
Default Enclosure for Vifa 4" midrange driver?

I've built plenty of subwoofer boxes before but this is my first stab at midrange. I'm a bit confused as what I should use enclosure wise:

This is what I'm using a Vifa MG10MD09 a 4 ohm, 4 inch midrange driver. http://www.madisound.com/cgi-bin/ind....6182&pid=1367

Click the image to open in full size.

My application- MIDRANGE driver, 180 Hz- 3.15K active xover 24 dB/oct slope.

Tweeters- Vifa "ring radiator style" from 3.15K up
Midbass - 8" Silverflute woofers. 180 Hz down.


Should I
A) Build a sealed enclosure, if so what size?

B) Should I simply leave it the way it is now, sharing a common airspace with the Silverflute 8" mids. Help!
  Reply With Quote
Old 1st March 2007, 06:15 PM   #2
diyAudio Member
 
Join Date: Feb 2004
Location: Queensland Australia
Definitely build a separate enclosure for the mid. This serves two purposes. (A) it stops the frequencies from the bass unit coming out through the mid cone. It stops the bass modulating the mid cone and allows the Vifa to concentrate on the mids. (B) a separate mid enclosure will allow the bass unit to function as intended. If you don't separate it from the bass unit the mid will act as a small "Drone cone" or auxilary bass radiator to give it its proper name and this will alter what ever type of bass loading you had planned. As to the size.....well anything around 2-3 litres should be good. It won't be too critical. Now there are some general guide lines to help reproduction. (i) Assymetrical enclosures are good in that if you avoid parrallel sides you get less standing waves in the enclosure and this should make the mids clearer. (ii) make the box thick enough to prevent bass frequencies getting through. Put some sort of fibre in it. ie BAF etc. Now I have found a cheap and simple solution is to use terra cotta flower pots. These come in a variety of sizes, are acoustically "dead", are readily available and already have a hole for the leads/connecting wires. Saves a lot of time. See your local garden supplier. You have to then ensure that ou can attach it to the back of the baffle but there are various ways you can work that out. If you are doing detailed and accurate calculation for the bass unit you need to deduct the volume of any mid range enclosure from the box size to make sure you ave the right volume for the bass driver.

Sound like a really good system...hope it works well.
__________________
"It was the Springtime of the year when aunt is calling to aunt like mastodons bellowing across primeval swamps." P.G. Wodehouse.
  Reply With Quote
Old 1st March 2007, 06:19 PM   #3
MaxS is offline MaxS  France
diyAudio Member
 
Join Date: Mar 2006
Location: France
http://audioclone.free.fr/vifa.html

Try this one.
__________________
Ca marche pas ! Tu ne l' as pas branché non plus ....
  Reply With Quote
Old 1st March 2007, 07:52 PM   #4
diyAudio Member
 
Join Date: Jul 2003
Location: maryland, USA
Send a message via AIM to eRiCdWoNg
Quote:
Originally posted by Jonathan Bright
Definitely build a separate enclosure for the mid. This serves two purposes. (A) it stops the frequencies from the bass unit coming out through the mid cone. It stops the bass modulating the mid cone and allows the Vifa to concentrate on the mids. (B) a separate mid enclosure will allow the bass unit to function as intended. If you don't separate it from the bass unit the mid will act as a small "Drone cone" or auxilary bass radiator to give it its proper name and this will alter what ever type of bass loading you had planned. As to the size.....well anything around 2-3 litres should be good. It won't be too critical. Now there are some general guide lines to help reproduction. (i) Assymetrical enclosures are good in that if you avoid parrallel sides you get less standing waves in the enclosure and this should make the mids clearer. (ii) make the box thick enough to prevent bass frequencies getting through. Put some sort of fibre in it. ie BAF etc. Now I have found a cheap and simple solution is to use terra cotta flower pots. These come in a variety of sizes, are acoustically "dead", are readily available and already have a hole for the leads/connecting wires. Saves a lot of time. See your local garden supplier. You have to then ensure that ou can attach it to the back of the baffle but there are various ways you can work that out. If you are doing detailed and accurate calculation for the bass unit you need to deduct the volume of any mid range enclosure from the box size to make sure you ave the right volume for the bass driver.

Sound like a really good system...hope it works well.
Click the image to open in full size.

Makes sense. I'll spill the beans this is actually my car stereo setup. The doors right now are the "enclosures". The picture is a very early shot when I first did the install 2 years ago. I'm considering also making enclosures for the woofers, but that may be hard to do with the window mechanisms etc. The midrange should be easier since the enclosures don't need to be that big. If I do the woofer I want it to be .5 cubic foot (14 L).

The issue I'm having right now is the system sounds great, but there's always room for improvement. I'm getting a rather large (10 dB) spike at 1 Khz I have to EQ out. I'm hoping this is cause the midrange is not enclosed right now. With an enclosure this should clean up the midrange and bass.


Quote:
Originally posted by MaxS
http://audioclone.free.fr/vifa.html

Try this one.

I clicked on all the links and nothing happened and I can't read french. What does that site do?
  Reply With Quote
Old 2nd March 2007, 12:33 AM   #5
diyAudio Member
 
Join Date: Feb 2004
Location: Queensland Australia
Okay....alright......I give up.....what about a very, very, small flower pot!!!!!!!!!!!!!!
__________________
"It was the Springtime of the year when aunt is calling to aunt like mastodons bellowing across primeval swamps." P.G. Wodehouse.
  Reply With Quote
Old 2nd March 2007, 02:17 PM   #6
diyAudio Member
 
Join Date: Jul 2003
Location: maryland, USA
Send a message via AIM to eRiCdWoNg
I haven't gone in and measured yet but I think I will be able to use a PVC pipe of the right O/D and attach it to the baffle using fiberglass or something similar. Then use a cap at the end. Weekend project here we come!

If I'm lucky I may try to do an enclosure for the woofer.
  Reply With Quote
Old 5th March 2007, 01:33 AM   #7
diyAudio Member
 
Join Date: Jul 2003
Location: maryland, USA
Send a message via AIM to eRiCdWoNg
Well I've done some calculations. The best I can get for the midrange enclosure short of doing major modifications to the car is about .5 Liters. Its much smaller then 2-3 Liters recommended. Any thoughts on this? I guess the only way to find out is to try it.
  Reply With Quote
Old 5th March 2007, 03:20 PM   #8
Clipped is offline Clipped  Thailand
diyAudio Member
 
Join Date: Mar 2005
Location: home
Send a message via MSN to Clipped
nice install...i like it...8" in doors...damp the doors yet? or cover the holes yet?
  Reply With Quote
Old 5th March 2007, 03:33 PM   #9
diyAudio Member
 
Join Date: Jul 2003
Location: maryland, USA
Send a message via AIM to eRiCdWoNg
Quote:
Originally posted by Clipped
nice install...i like it...8" in doors...damp the doors yet? or cover the holes yet?

Thanks, the pic is an early one I had conveniently hosted already. That pic was before I sealed the doors, replaced that access cover with a sheet of braced MDF and before I treated the MDF with Spar Polyurethane.n The damn door still rattles though and its high passed at 60 Hz for the sub which is in the rear of the car.

Curious though, I think one of the reasons my midrange had a spike at 1000 Hz was cause the "enclosure" (hard to describe) I had was too closed off in the back. I'm going to open up the rear and see what it does before building the enclosure. If it sounds good I might just say screw the enclosure :lol:
  Reply With Quote
Old 6th March 2007, 12:56 AM   #10
Clipped is offline Clipped  Thailand
diyAudio Member
 
Join Date: Mar 2005
Location: home
Send a message via MSN to Clipped
i made some door enclosures from 6" pvc elbow joints once , cut to the proper angle...it had a peak around the same freq as you.

since the pvc has a similar pitch to 1000hz when i tapped it, i took silicone and lined the entire interior with it, took off the back and laid aluminium tape across the back and siliconed over it.

i submerged one of those metal straps with holes into the backside with the silicone and epoxied it to the sides (on the inside)to allow for easy mounting,

something similar to a aperiodic membrane, ringing went away with silicone.
  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
WTB: Pair of Vifa 3" midrange domes walker112 Swap Meet 2 20th May 2009 09:31 PM
"Vifa PL11WH09-08 Premium Line Paper cone midrange" GOWA Multi-Way 0 17th November 2007 01:22 PM
FS Vifa 4" M10-MD-39-08 Midrange russw1 Swap Meet 1 27th September 2007 07:56 PM
do i need an enclosure for midrange driver? ironpen45 Multi-Way 3 23rd March 2007 11:12 PM
Enclosure volume for VIFA K10MD midrange murat Multi-Way 0 11th February 2005 09:27 PM


New To Site? Need Help?

All times are GMT. The time now is 06:44 PM.


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