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Old 1st November 2011, 12:40 PM   #11
tyu is online now tyu  United States
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Default Magnepans MOX-1

All you can do is put things in front of the sound,Less is More.
In the 90s i had a pr of the MG3a like you an Windell at Magnepan told me there was no better way to get good sound,To day thay have found the crossover that thay use is the only way to go ... Ok for there new MG1.7s an other .7 Maybe...Your setup work vary good with the MG3a,s...Your on the right path i think,just get caps you like an your there...
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Old 1st November 2011, 03:48 PM   #12
Davey is offline Davey  United States
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I'm convinced.

I first built a PLL approximately thirty years ago......and have constructed many since then.

It's certainly an option, but ALL variables (and there many) have to be well understood to achieve the desired result.

Cheers,

Dave.
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Old 1st November 2011, 05:03 PM   #13
tyu is online now tyu  United States
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So you not going to give us you Variables ON THE 3a...Thanks
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Old 1st November 2011, 07:12 PM   #14
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Default Ulaahh...

Ulaaahh...

The photo show a nice 6db/oct filter, with an 'nice' resistor coming from nowere...
6db/oct is the most artistical soluiton, on the paper it gives the perfect results...
Reality is completly different : the two speakers must match in many areas, having the same 'tone', the same phase shift, the same impulse response, the same power handling...
... on three octaves at least.

If no, then ... I experienced so many failures in the last 30years that I will not review them.
Basically, there is no way to obtain high level of sound with a 6dbct filter, in respect with a good impulse response and stable stereo image. Few succeded, I admire them !

About MGIII : only having a look to the impulse response of the bass and mid panels of the MGIII show that ther is a total incompatibility. Sorry for the Magnepan staff for whom i've got the highest respect.
The medium pannel is far away quicker than the low panel.

12db gives acceptable results, 18db/oct is 'better in impulse response, but i prefered the less precise but more rich sound given by the 12db/oct.

good to discuss about this ,
Mathieu
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Old 1st November 2011, 07:18 PM   #15
andyr is offline andyr  Australia
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Quote:
Originally Posted by Acoustannoy View Post

Basically, there is no way to obtain high level of sound with a 6dbct filter, in respect with a good impulse response and stable stereo image.

Mathieu
Then how do you explain the fact that for the current models 1.7 & 3.7, Magnepan have used all-6dB filters?

Regards,

Andy
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Old 1st November 2011, 08:01 PM   #16
tyu is online now tyu  United States
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Well wheres my Rs........12db works for me...I have a pr of 3a here now got them for free, geting them out of a guys house, thay went or he went! An dont think thay sound good with anyset up i have,maybe the R tweeter with my Acoustat M3s...but have not even done that goodluck....
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Old 1st November 2011, 08:07 PM   #17
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Aarghh...
I m trapped.
i don t know the latest mgs, i can only assume that the impulse response of the low frequency pannel is closer to the mid pannel. Mg people know these pannels like their own children and they found a way to quicken the low pannel...
Basically the big advantage of the mg s is that low and mid pannel use the same mylar film. So at least the 'tone' is the same.
When writing a out my attemts about tuning 6db/oct filters, i was maily thinking about traditional speakers. 20years ago i sweared only by 6db, listening tests brang me bagk o reality...
cheers
mathieu
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Old 16th January 2013, 08:50 PM   #18
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I forgot to answer ...
For active filter out of DIY, the Bryston if a good choice even if not cheap.
Mathieu
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Old 27th January 2013, 05:22 AM   #19
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Default Biamp PLLXO 400Hz - 200000ohm / 3300ohm

Here is the PLLXO 12db - 400Hz for biamp.
Mathieu
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