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Old 1st June 2006, 11:55 AM   #21
ttan98 is offline ttan98  Australia
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hm
===

I don't understand German, what is the meaning of
"zischilig"?

Also 1.5mm stoke you mean Xmax=1.5mm.

Your input is very informative...
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Old 1st June 2006, 12:45 PM   #22
vmac011 is offline vmac011  Serbia
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Default AN 8" double vent

I live with AN8" for almost a year now (see my thread Audio Nirvana 8" double vented )

The speakers are now burned in thoroughly. It's not bad speaker. In fact, it's pretty good. It developed anoying buzz on certain frequencies in one of them. Apparently, the coil was rubbing against the magnet. The buzz dissapeared completely after 3 months. Accordion suspension is way too soft and has lost it's form on few places, but it didn't affect the performance. Friend of mine made similar enclosures, but with FE206. Naturally, we swaped drivers for a month or so.
The differences are subtle, but noticable. Fostex has better defined bass. It appears to go a tad lower in frequency range too.
Human voices are better reproduced by AN8. In the matter of fact, this is where AN really shines. It has more treble than Fostex, but it causes some listening fatigue for being a little to "dry" even clinical. Fostex produces highs with some dose of coloration or should I say mellow. If they are evenly priced, I would choose Fostex, but I'am quite happy with AN8.

Equipment used:

- 'El cheapo' DVD player ($100 range)
- 8xNOS DAC (kit bought from DIYFidelity.com.au)
- Charlize AMP
- Switch type attenuator (also from DIYFidelity.com.au)
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Old 1st June 2006, 01:43 PM   #23
hm is offline hm  Europe
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Default ttan98

Yes, stroke is Xmax.

"zischelig" ment whisper, hissing sound of the upper highs.

sorry my english is bad, i hope it is understandable.
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Old 1st June 2006, 02:10 PM   #24
ttan98 is offline ttan98  Australia
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hm
===

You have a lot of experience with full range speakers,
a no. of questions please:

1. this type of speaker tends to have peaks at upper midband freqencies eg DX2 peaks at 2 and 10Khz. Does this lead to shouting which occurs in Lowther speakers?
Can this shouting be tamed, if so how?
Fostex is not so prevalent I believe.

2. Some DIY's here go even further to tame this variations of the highs( I think) by put in a cross-over and add an expensive ribbon tweeter, eg Aurum cantus etc. Is this necessary? Any comments eg have you tried or heard a unit with a tweeter installed?

There are a few more questions but that is enough for now....
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Old 1st June 2006, 03:22 PM   #25
hm is offline hm  Europe
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Default ttan98

1. yes, this effect depends on the driver construction,

you see on Fostex and Nirvana it is not a must.

I try a lot, the best way is for me now, donīt use Lowther.

2. i donīt like parts between speaker and amp,
i try to get everything acousticly.
If you take a tweeter than you donīt need an expensive FR,
my experience shows a crossover has a bad influence of
the whole sound.
This is very complicated and complex and my vocabulary
to explain all the interdependens of it, is to small, sorry
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Old 1st June 2006, 07:19 PM   #26
felixx is offline felixx  Romania
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Allmost 8"full range drivers have a problem in 2-3khz region.
Is necessary to do a notch filter to adjust that but only for a limited time...........maybe only burn in period is finish.
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Old 2nd June 2006, 12:18 AM   #27
vmac011 is offline vmac011  Serbia
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Default Wheazer circumcision

I have adopted similar view as our German friend hm in respect to crossovers and notch filters. I would rather re-design enclosure and modify driver to overcome it's shortfalls. Having said that, brings me to mod I did few moths ago which I forgot to mention in my previous post.
I've removed 5mm off the top of the wheazer cone. Speakers are now more civilized and savage hights are gone. The bass seems to be more accurate too (FE206 still goes lower in freq. range). It may sound weird, but mu speakers now really like to play funk. The sound of slap bass is so much better. I recommend Marcus Miller, Louis "Thunderthumb" Johnson and Mark King (Level42). I cream myself every time I hear MrPink from Mark King. This defies common misconception that full range is only for old farts listening opera from vinyl records.
My next experiment is to coat membrane with diluted wood glue to overcome that "papery" sound associated with all large non-Lowther full range drivers. I'll keep you posted.
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Old 2nd June 2006, 01:32 AM   #28
ttan98 is offline ttan98  Australia
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"I've removed 5mm off the top of the wheazer cone."

How do you do this?, can the wheazer cone can be removed first, then you perform the surgery!! then replace it.
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Old 2nd June 2006, 05:12 AM   #29
vmac011 is offline vmac011  Serbia
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Default $2 Nail clipper

To ttan98

I've used nail clipper for this surgery for few reasons:
1. No need to muck arround glue solvents in order to remove the cone
2. I'm lazy to remove drivers from the enclosure.
3. Precision. The pin in the middle of the clipper is not only a fulcrum for the leaver, but it also limits you how deep you can "bite" with it, thus making a perfectly parallel cut.
4. As a consequence of using a nail clipper you'll end up with a nice bloomy edge of a cone. It looks like a flower with lots of petals. Paint it in some loud colours to attract bees.
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Old 2nd June 2006, 05:51 AM   #30
felixx is offline felixx  Romania
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Another good job in modded Fe206 is made by Steve Deckert from decware.com.He said the 3khz peak was gone and is more linear also and is more good than Dx2 from Lowther,
Is good story to read but ......i don't really know that ...........have also an enclosure with modded 206 and two passive rad. and the freqv. go down to 35hz........what do you think about that?
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