Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Vifa 9 BGS 119/8 Alternative for Picolino 2
Vifa 9 BGS 119/8 Alternative for Picolino 2
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 25th August 2013, 12:12 AM   #1
DaleHughes is offline DaleHughes  United Kingdom
diyAudio Member
 
Join Date: Aug 2013
Wink Vifa 9 BGS 119/8 Alternative for Picolino 2

Hi, this is my first post here, so please be gentle if I come out with something stupid...

Basically, I found plans online for a full range transmission line enclosure called the PicoLino 2. I'm not sure if any of you are familiar with this, but it gets quite good reviews, and looks like a project I'd be interested in doing.

However, the required driver is the Vifa 9 BGS 119/8, which is rather difficult to find where I am. At least, the postage to where I live makes it a somewhat difficult proposition. What I'm looking for is an alternative to this driver that'll work as well. It'd be best if the price could be similar, but I can spend more if necessary.

These are the T/S parameters -
Resonance frq. fms: 87 Hz Mech. Compliance Cms 1.522 mm/N Mechanical Q Qms: 3.08 Moving Mass Mms: 2.2 g Electrical Q Qes: 0.87 mech. Resistance Rms: 0.39 kg/s- Total Q Qts: 0.68 Max. Displacement Xmax: 2.35 mm Equivalent Air-Vol. Vas: 3.1 Liter BL Product Bl: 2.95 N/A DC-Resistance Re: 6.3 Ohm Membrane- Md: 90 Coil Inductance Le: 0.12 mH Membrane-Area Sd: 38 cm
One other thing is that since I haven't built these yet, the diameter of the alternative driver isn't particularly important - I can adjust the design to make it fit.

Thanks in advance!
  Reply With Quote
Old 25th August 2013, 01:52 AM   #2
xrk971 is offline xrk971  United States
Got Foam?
diyAudio Member
 
xrk971's Avatar
 
Join Date: Oct 2012
Location: Metro DC area
Vifa 9 BGS 119/8 Alternative for Picolino 2
This driver sounds a lot like the Vifa TG9FD fiber glass cone driver, although the fs and Qts appears lower.
Vifa TG9FD-10-04 3-1/2" Glass Fiber Cone Full Range 264-1064
There is also the paper cone variant called the TC9FD which I have a lot of experience with and sounds great in a TL. From the picture of the Picolino 2,

Click the image to open in full size.

I think the design looks fairly forgiving of different drivers and I would guess that the TC9FD should work fine - even better I think as the high end on the TC9FD is very good and flat.
TC9FD is here:
Vifa TC9FD-18-08 3-1/2" Full Range Paper Cone Woofer 264-1062
  Reply With Quote
Old 25th August 2013, 03:58 AM   #3
xrk971 is offline xrk971  United States
Got Foam?
diyAudio Member
 
xrk971's Avatar
 
Join Date: Oct 2012
Location: Metro DC area
Vifa 9 BGS 119/8 Alternative for Picolino 2
Here is a simulation of the Picolino2 with a 9BGS vs a TC9FD and TG9FD - the BGS is smoother and the TC9 and TG9 have higher Qts so there is a big bass spike - may be a little boomy but not too bad overall.

- 9BGS
- TC9FD
- TG9FD

all 16 in away from back wall.
Attached Images
File Type: png Picolino2-9BGS-Freq-1m.png (26.7 KB, 614 views)
File Type: png Picolino2-TC9FD-Freq-1m.png (26.7 KB, 602 views)
File Type: png Picolino2-TG9FD-Freq-1m.png (26.9 KB, 591 views)
  Reply With Quote
Old 25th August 2013, 05:13 AM   #4
xrk971 is offline xrk971  United States
Got Foam?
diyAudio Member
 
xrk971's Avatar
 
Join Date: Oct 2012
Location: Metro DC area
Vifa 9 BGS 119/8 Alternative for Picolino 2
Update on alternative to Vifa 9BGS. It is a unique driver: I have tried many other similar drivers in the sim but nothing works as well - so obviously the Picolino2 is really optimized for this driver. You might try adding a lot of stuffing or use a thinner material for cabinet to help absorb that high Qts bass peak. I tried the following drivers and they all had a bass peak: Visaton FRS8, FR10, Tang Band W3-315e, W3-881si, Fostex FF85WK, Dayton ND-90, Peerless 830986. The TG9FD is probably the closest performer to the original.
  Reply With Quote
Old 25th August 2013, 07:54 AM   #5
Scottmoose is offline Scottmoose  United Kingdom
diyAudio Member
 
Scottmoose's Avatar
 
Join Date: Mar 2005
Location: UK
It's a fairly straightforward ~20:1 TQWT.

Of the Vifa units, the TG9 is closest if you can't get the design driver. Damped out you'll get the attached (1/2 space). However, what the bald FR sweeps don't tell you & what is often ignored is the rocketing (read 'chronic') harmonic distortion. So beware with the volume knob.
Attached Images
File Type: png With Vifa units.png (30.9 KB, 578 views)
  Reply With Quote
Old 25th August 2013, 09:01 AM   #6
Frank40 is offline Frank40  Denmark
diyAudio Member
 
Frank40's Avatar
 
Join Date: May 2004
Location: My workshop :-)
Hey, Found is here they should bee in stock. hifisound eShop - VIFA 9 BG 119/8 GLASFASER
  Reply With Quote
Old 25th August 2013, 09:24 AM   #7
mondogenerator is offline mondogenerator  England
diyAudio Member
 
mondogenerator's Avatar
 
Join Date: Sep 2009
Location: City Of Villans
I recall that kit/design from when i 1st started looking at fullrange TQWPs and had the same problem in finding the driver. I bought my alpair 5 with the aim of adapting the design, and then forgot about it lol
__________________
Balancing the things I must do, with the things I'd like to do...This is a skill (or a luxury) amongst many that I do not possess.
  Reply With Quote
Old 25th August 2013, 11:09 AM   #8
xrk971 is offline xrk971  United States
Got Foam?
diyAudio Member
 
xrk971's Avatar
 
Join Date: Oct 2012
Location: Metro DC area
Vifa 9 BGS 119/8 Alternative for Picolino 2
Sounds like the TG9FD is the way to go then. My sim actually has all the folds and geometry as shown in the plans (Click the image to open in full size.) - I was surprised how "optimized" it was for the 9BGS driver.
  Reply With Quote
Old 25th August 2013, 11:32 AM   #9
DaleHughes is offline DaleHughes  United Kingdom
diyAudio Member
 
Join Date: Aug 2013
Wow, thanks for all the information. I appreciate you going to the bother of doing simulations for this. I'll certainly take this all into account when deciding what driver to use.

One question though, what software are you using for the simulations? Is it something someone with nothing more than a reasonable knowledge of computers and basic understanding of transmission line enclosures and speaker parameters could work with?
  Reply With Quote
Old 25th August 2013, 11:37 AM   #10
sayrum is offline sayrum  Germany
diyAudio Member
 
Join Date: Jun 2011
Hey,
Quote:
Originally Posted by xrk971 View Post
... I was surprised how "optimized" it was for the 9BGS driver.
no surprise there. Mr Timmermanns a Master of Engineering, has been publishing a diy speaker building magazin here in germany for many years and is know for his very meticulous approach.

If an easy compact build for a still available full ranger is of interest, maybe this one is for you.

Greetings

Last edited by sayrum; 25th August 2013 at 11:39 AM.
  Reply With Quote

Reply


Vifa 9 BGS 119/8 Alternative for Picolino 2Hide 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
Visaton BGS 40 Pair Save $178 Michael Rothacher Swap Meet 11 15th February 2011 11:35 PM
Samba Squad, Toronto street band, 119 dBC peak bentoronto Music 4 29th July 2010 05:08 PM
pioneer A-119 elec972 Solid State 0 30th December 2006 03:16 PM
Picolino downscaling 4real Full Range 28 2nd December 2004 07:54 AM
OSCONS better than BGs in all Power supply decoupling? PhopsonNY Parts 7 31st December 2002 02:38 PM


New To Site? Need Help?

All times are GMT. The time now is 11:21 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki