Go Back   Home > Forums > Loudspeakers > Full Range

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 16th March 2009, 04:25 PM   #1
m4rs is offline m4rs  France
diyAudio Member
 
Join Date: May 2008
Default Fonken Floorstander

Hello,

I am planning to build a pair of Floorstander MkII with FE127. My amp is an Atoll IN50, a french solid state amp: http://www.atoll-electronique.com/ampliintegre.php

I read I needed to put a resistor between my Amp and the fonken because of the output impedance, but what value, and what type of resistor ?

Thanks

Cyrille
  Reply With Quote
Old 16th March 2009, 05:21 PM   #2
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
I've heard good things with the atoll.

As to size of R to knock back the damping factor, that is a matter of experimenting. I would start by just playing with wire size. You can start with a pair of 24 g strands of Cat 5 cable (because it is easy to get and cheap), but you may find skinnier works even better -- 30g or skinnier magnet wire would be well worth trying... it is skinny enuff that it gets hard to work with and is easy to damage. If you end up there, winding the pair of connectors around a central core (such that conductors cross as an angle) or sandwiching it in heat seal plastic or packing tape is a good idea for longevity.

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 16th March 2009, 09:38 PM   #3
chrisb is offline chrisb  Canada
diyAudio Member
 
Join Date: Aug 2002
Location: victoria BC
Dave, you mean wire size - Cyrille probably already knows what size wore works best for him

and frankly, with the FE127 , depending on speaker placement (i.e. symmetric corner loading) you might not need series R, or even BSC
__________________
you don't really believe everything you think, do you?
community sites t-linespeakers.org, frugal-horn.com commercial site planet10-HiFi
  Reply With Quote
Old 16th March 2009, 10:15 PM   #4
m4rs is offline m4rs  France
diyAudio Member
 
Join Date: May 2008
what I was about to ask is how I would know if R is too small. But it seems that it is in the lack of bass I can hear serie resistor is too small. Or am I wrong?
  Reply With Quote
Old 16th March 2009, 10:15 PM   #5
m4rs is offline m4rs  France
diyAudio Member
 
Join Date: May 2008
And yes for the wore I have an idea of what size works for me
  Reply With Quote
Old 16th March 2009, 10:58 PM   #6
chrisb is offline chrisb  Canada
diyAudio Member
 
Join Date: Aug 2002
Location: victoria BC
Well Cyrille, I'd be inclined to wait til you actually get the drivers fully broken in (up to several hundred hours of playing time), before you make any decisions as to the final value of any BSC and/or series R.

FWIW, the amps I've been using for musical playback for at least the past 5 yrs or so (during which the Fonken family was conceived and continues to expand), have been almost exclusively low damping factor tube amps. That, using a single strand of #24 CAT5, and the small size of my listening rooms, significantly reduces the need for correction of the type you're discussing.

Having said that, on the one occasion that I did build an enclosure for experimentation with a variety of drivers that might need some series R, I used one of these for ease of inserting/ bypassing values under test:

Click the image to open in full size.

they could also no doubt be used as a platform for components for BSC components if desired. (i.e. lots of space to directly attach the passive components, or a PC board or even thin piece of masonite/hardboard.)
__________________
you don't really believe everything you think, do you?
community sites t-linespeakers.org, frugal-horn.com commercial site planet10-HiFi
  Reply With Quote
Old 18th March 2009, 12:19 PM   #7
m4rs is offline m4rs  France
diyAudio Member
 
Join Date: May 2008
ok i'll do that, I just ordered an Amp6 from 41Hz and if I need a correction it'll be easier to switch between the two amps.

By the way thanks to both of you for the fonken design, and for responding to all question on the forum. I work in software development and I'm using linux and free software and I thought it was kind of the same approach. Have you think about licencing your design with one of the creative common licences ?

http://creativecommons.org/about/licenses

Best regards
  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
Fonken black ecir38 Full Range 2 17th December 2008 06:45 PM
Fonken floorstander duct seal & damping artfuldodger Full Range 5 17th December 2008 03:14 PM
Fonken floorstander MKII ecir38 Full Range 68 18th November 2008 02:00 PM
Fostex FE127eN / Fonken Floorstander Mk II Questions N1ESE Full Range 3 15th November 2008 10:36 PM
1st timer building Fonken Floorstander MkII with Planet 10 FE127eN drivers rbclark Full Range 33 24th April 2008 07:25 AM


New To Site? Need Help?

All times are GMT. The time now is 07:34 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