Should I or shouldn't I........ - diyAudio
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 24th May 2011, 03:22 PM   #1
diyAudio Member
 
Join Date: May 2011
Location: Portland Oregon
Default Should I or shouldn't I........

I've recently fell in love with my small Fostex driver (FE127E). Although not in an ideal cabinet I have an idea of what it can and will do in a proper enclosure.

I am getting some Audio Nirvana Alnico 10's for free......well I do have to drive a buddy 400 miles round trip to pick up some Oris 150's and he'll give me the NIB AN's.

Should I scrap all plans moving forward on the Fostex and work with these Audio Nirvana's? We're obviously talking two totally different drivers but could someone maybe compare the two?
  Reply With Quote
Old 24th May 2011, 03:26 PM   #2
ra7 is offline ra7  United States
diyAudio Member
 
Join Date: Feb 2009
Blog Entries: 1
YES. From my experience, the ANs will beat the pants off the fostex drivers... they are more detailed and natural sounding. The fostex are right up there too, just that the ANs are that much better.

Build a voight pipe or some horn enclosure. I wouldn't recommend bass reflex because you won't get much bass out of it. The other option is to slap'em on an OB with a 15" driver. That'll work really well.
  Reply With Quote
Old 24th May 2011, 03:31 PM   #3
diyAudio Member
 
Join Date: May 2011
Location: Portland Oregon
A few issues I may have with a larger driver. My system is "near field" and I only have about 13" in width to work with for each speaker so it will need to be taller and slim.
Secondly, I have zero wood skills and zero tools so if I could do a simple cabinet with a port for these AN's that would be great. As it is I get ALMOST enough low end out of my Fostex.
  Reply With Quote
Old 24th May 2011, 04:45 PM   #4
ra7 is offline ra7  United States
diyAudio Member
 
Join Date: Feb 2009
Blog Entries: 1
Well, if you're satisfied with the FE127's low end, maybe a bass reflex for the AN may not be such a bad idea.

OB will work well and requires minimum skills and tools, but you will need another driver for bass plus a crossover. Might be too much at this stage.

May be just stick with the bass reflex then. The ANs will not disappoint
  Reply With Quote
Old 24th May 2011, 04:52 PM   #5
diyAudio Member
 
Join Date: May 2011
Location: Portland Oregon
I think BR is the best option for me on a few levels. Does anyone happen to have measurements for a BR that would work with the AN Alnico 10?
  Reply With Quote
Old 24th May 2011, 05:00 PM   #6
diyAudio Member
 
Scottmoose's Avatar
 
Join Date: Mar 2005
Location: UK
Given that both drive units are utterly different animals, it is impossible to make any sensible comparison. About as far as we can go is to point out the blindingly obvious, viz. that the AN10in unit is the more efficient, and will have far more linear dynamic range. Given that it is more than five times larger than the little FE127E, this isn't exactly startling.

FWIW, the AN wants a big box; standard 4th order max-flat vented by the factory spec. (about which I have reservations) is 480 litres tuned to 27Hz. You can go smaller (these things are relative) but I wouldn't personally want to use it in a BR much smaller than 250 litres -assuming a half-decent alignment is what is wanted. The AN drive units are not immune from the laws of physics. Sealed would be a better bet if a more modest sized box is needed; 0.707Qtc is around 252 litres but if you're willing to accept a slight rise to 0.8 140 litres should theoretically be reasonable.

Last edited by Scottmoose; 24th May 2011 at 05:06 PM.
  Reply With Quote
Old 24th May 2011, 05:31 PM   #7
IG81 is offline IG81  Canada
diyAudio Member
 
IG81's Avatar
 
Join Date: Feb 2008
I don't know which of the manufacturer listed specs hold water in real life, but with a pretty low Fs (35Hz) and such a Qts (0.53), it is IMHO an ideal contender for an aperiodic box. Design for a sealed enclosure of Qtc~0.95 and de-Q it down to your liking with ScanSpeak Variovents or a DIY resistive vent.

I did a quick kludge/modelling, 80L sealed results in Qtc~0.95 and f3 could be expected around 70Hz (fudgier to estimate). This is of course a big compromise on LF extension to get a smaller enclosure.

IG

Last edited by IG81; 24th May 2011 at 05:38 PM.
  Reply With Quote
Old 24th May 2011, 05:41 PM   #8
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
I have been very underwhelmed by the 8, 10, 12" AN stell basket drivers i have had thru here. The Alnico is likely a diifferent beast, althou with the cones looking the same they will have some of the same issues. When i looked at the Alnico 8, the big drop in efficiency indicated to me that the alnico may well exist for marketing reasons. You expect alnico to have a stronger motor, not a way weaker one.

When one looks at your listening conditions, and consider that at least a couple metres away is needed from a 10 to have it integrate, and then the big difference in required box size...

The 7k peak on the FE127 does need dealing with, but i've had practise with that.

But even as an "investment" the AN are likely good currency.

with reguards IG81's sim, a 13 litre FonkenPrime will net ~65 Hz.

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 25th May 2011, 02:34 AM   #9
ra7 is offline ra7  United States
diyAudio Member
 
Join Date: Feb 2009
Blog Entries: 1
My experience has been quite the opposite to planet10's. The ANs I have are far and away the better drivers compared to every single full range driver I've heard, bar the Lowthers. I recently got a chance to measure their impedance curves and there was an excellent match between the two I have. Even their specs were not too different the published ones. So, I don't know why people go on about the ANs lack of quality control. They're no different than any other driver on the market.

As for listening at such close distances, I would agree that the smaller fostex may be a better choice.
  Reply With Quote
Old 25th May 2011, 03:17 AM   #10
diyAudio Member
 
Join Date: May 2011
Location: Portland Oregon
Thanks for the opinions so far guys. It turns out they are 8" and not 10" but never the less should be fun. I'm leaning towards building with the AN's first (can only afford one at a time). After all I do have the Fostex in cabinets that work for now. OB sounds kind of interesting, I do have some Jensen 12" 16ohm drivers that may work in OB with the AN 8". Building a x-over is WAY beyond me though.
  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



New To Site? Need Help?

All times are GMT. The time now is 05:09 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