[9anda1f]

umm, so what is it that you just did we shouldn't copy???     the 9" wide baffles??

9anda1f

[Shogun]

After 10 days and 25 hours with these filter, I have to say that I am very  impressed with the result. The first day I wasn’t so sure if I would keep it. Now, I can’t live without it! I know I have to let it play some days before making any jugement.

There is more bass, the midrange is more natural, and the unstable treble (is it call beaming?) is removed. The sounstage and the imaging too are more to my liking.  The whole presentation is much much more musical and it doesn’t hurt my ears anymore.

My original plan was to add a bass driver after the filter, but now I not in a rush to do it. I think I can even live without a bass driver or a tweeter.

The best thing with the filter is that it doesn’t seem to loss anything, well at least for my ears.

… with one only exception, the efficiency is reduce, I have to turn the volume from 9 oclock to 10-10:30. The first day I have to turn from 9 oclock to aroutn 12. I’m using a Charlize as a power amp.

Thanks to Scorpion and Mark C. This is the best tweak for the Visation B200. It’s simple to understand and easy to do it.

Sorry if my english is not very good, it’s my third language.

[gilbodavid]

hello 9anda1f. baffles 9" wide and 3.5' long. the driver was near the top. it looked so nice and civilized, then i turned it on and played music that sounded like it was coming out of a small transister radio! quite funny really. The difference detween that and baffles 3 times the width baffles me...

[markC]

You are most welcome Shogun. Nice improvement eh? A notch filter centred @ around 13k further reduces the beaming but complicates things a little; as in do I need a tweeter? I haven't tried a phase plug, but it does sound intriguing...

[gilbodavid]

Has anyone compared the mox to geoff H's circuit here http://www.diyaudio.com/forums/showthread.php?s=&threadid=99662

[gilbodavid]

ps I'm running solo b200's with mox of .68mH and 6.8ohms, huge improvement, and its still too sharp for me in my room, so going to 1mH and 8 or 10ohms to see what that does. i'm interested in getting there without bass drivers...

[markC]

You could try a notch filter. The parts are cheap, and as usual, it is system, room, ears dependant.
The filter I tried consisted of a 27 ohm resistor, 2uf cap and .05mH inductor all in parallel. This parallel filter was then wired in series to the positive leg of the b200 Downstream of the BSC. Don't forget the zobel after the notch filter. Without the zobel things change a lot.
If your not using a zobel currently, try it first b4 you try the notch filter.
Just me thinking outloud.

[konut]

Hehe. Just got my filter yesterday.  Sounds great! Thanks to all. 

[scorpion]

Congratulations Konut, this is really your thread. 

/Erling

[omegaspeedy]

What a great and helpful thread. A bit old I know but has helped me relax my B200 Aperoidic speaker beautifully. A 1mH .28ohm 1.4mm air wound inductor in parallel with a 6.8ohm 10watt MOX resistor has done wonders.

[konut]

  Are those Omega Aperiodic 8s? Sure look like it. Mine sound great with the contour circuit.

[scorpion]

Such a long time ago ........   

/Erling

[markC]

Yes, it was a long time ago. I'm still happily using the same circuitry! You definitely lose efficiency but it sure smooths out the sound.

[omegaspeedy]

So what is the thoughts of the addition of a 3.3uF cap to this circuit? I'm about to try it but it seems that there was not much more talk about it.

Yes those speakers above are my take of the Aperoidic 8's. Coming from a large Fostex BLH I'm still not 100% sure they are for me but still having fun tweeking them to the limit.

James.