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Old 8th November 2012, 10:07 PM   #11
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Default Nice Outcome

Since my 3a's were rebuilt at the factory (shipping damage) and the previous owner had painted the external crossover boxes there was information that I didn't have.
I found out today that the supplied crossovers have a built in ability to easily bi-amp.
The output from one amp goes into the Magnepan external crossover and then into the MG3a as normal set-up.
The amp chosen for mid-hi duty then goes DIRECTLY into the panel as there is the rest of the factory crossover inside the panel!
I'll try with tubes on the mid-hi side and then decide if I will pursue further.
BNK
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Old 9th November 2012, 08:52 PM   #12
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Hi brassnkeys, I think I have understood the set up. If so that arrangement is not strictly bi-amping as usually understood. To gain the benefit of reduced IMD in the power amps the frequency division needs to occur prior to the amp' as you were proposing in your first post.
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Old 9th November 2012, 09:00 PM   #13
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Jonathan,
Yes, I see what you are saying.
I did do an experiment today sending signal to a s.e.t. I have and using that to feed the mid/hi panels and leaving Adcom 555's the low panels.
2 things...
The s.e.t. doesn't have the power to properly drive through the loss of the crossover in the Maggies but...
the sound of the mid/hi is spectacular coming from the s.e.t.
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Old 9th November 2012, 10:43 PM   #14
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Yes, well that is a plus. The cross over should not absorb too much power though. You obviously have serious/high quality speakers and they won't have scrimped on the crossover quality. I Googled a photo' btw and it is not an "el cheapo" unit by any means.......

You will probably need a BIGGER s.e.t ha ha!
I was speaking with a fellow Aussie yesterday and he is going to build a 4 way active valve amp' system. Output transformers that cover the full audio range are of necessity a compromise but when you band split the way he is you can optimise the building of them for each frequency band. Pretty high tech'.
But the inevitable domestic "fiscal cliff" will inhibit that sort of thing down my way.
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Old 9th November 2012, 11:55 PM   #15
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Btw if you want to read up a bit more about this area there is a recent thread called "Active vrs passive" running in the multi-way forum and it has over 700 post and, if you'll excuse the expression, very 'active' at the moment. There is the inevitable "toing" and "froing" going on which is largely uninformative but if your prepared to wade through the rhetoric there will be good stuff too.
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Old 10th November 2012, 06:57 AM   #16
andyr is offline andyr  Australia
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Quote:
Originally Posted by bassnkeys View Post
Factory rebuilt MG 3's
Hi bnk - email me at: redwood dot andrew at gmail dot com

I took my IIIas to 3-way active (replacing the internal XO as well as the external) and then moved on to a more extreme version of the IIIas (search the Planar Asylum archives for "Frankenpans"! ).

So I can help you with what you want to do.

Regards,

Andy

Last edited by andyr; 10th November 2012 at 07:01 AM.
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Old 10th November 2012, 07:06 AM   #17
andyr is offline andyr  Australia
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Quote:
Originally Posted by bassnkeys View Post
The amp chosen for mid-hi duty then goes DIRECTLY into the panel as the rest of the factory crossover is inside the panel!
BNK
Not so, sorry. The internal XO is mid LP / ribbon HP ... so doing what you did, removes the (very necessary!) mid HP filter which is in the external XO box.

If you want to bi-amp - you need to go active and replace that external passive XO box with a 2-way active XO. But your SET is not going to cut it!


Regards,

Andy

Regards,

Andy
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Old 10th November 2012, 11:00 AM   #18
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You will probably need a BIGGER s.e.tha ha!
I was speaking with a fellow Aussie yesterday and he is going to build a 4 way active valve amp' system. Output transformers that cover the full audio range are of necessity a compromise but when you band split the way he is you can optimise the building of them for each frequency band. Pretty high tech'.
But the inevitable domestic "fiscal cliff" will inhibit that sort of thing down my way.[/QUOTE]

I think a giant s.e.t. would be the answer...
Right now I am feeding these panels with something in the neighborhood of 700 solid state each and they sound fantastic.
IMHO s.e.t.'s are the best sounding amps out there but 700 watt s.e.t.'s are not going to happen so....
BNK
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Old 10th November 2012, 05:41 PM   #19
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Having said that I must say that my friend found a beautiful, used Audio Research vt 100 last year and it is MUSICAL... out of my budget but an amazing piece.
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