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In Reply to: RE: That schematic doesn't make any sense to me, Davey ... posted by pistonengine08 on July 09, 2015 at 19:01:11
Pretty sure this is correct but looks like a short across the mid - not sure how it's driven at all?
I am using ALLXO and two channels/speaker
Should be simple to remove the woofer from the circuit, connect directly to low channel. Takes care of that end.
For the high channel, I foresee issues. I can't simple set the ALLXO and leave the circuit intact, because I'll be stacking HPFs onto the mid - not good. But I don't quite honestly understand how the mid XO is working to avoid that... sigh...
Edits: 07/09/15Follow Ups:
.
You hadn't seen that schematic on the Magnestand webpage before this?? :)
The older version of LspCAD has trouble with series network, but the newer version is much better. However, the inherent issue with this particular schematic can't be sorted with either LspCAD version.
Dave.
Yes, I had seen that schematic before.
My version of lspCAD has no problems with series XOs - just not that one!
Regards,
Andy
Hmmmm. The new version allows to create schematics in free-form configuration, so I wouldn't expect a problem. Are you saying that Magnestand schematic is incorrect in some way? How could that possibly be? :)
Dave.
Or I don't know how to create schematics in free-form configuration?
I'm not sweating, though! ;-))
Andy
Do you know what software will successfully work with the schematic?
No, it's not correct because, as you say, the midrange driver is shorted. (It certainly won't work like that.)
Remember, this is a series crossover. :)
Keep at it.
Dave.
No it's definitely right. The only errors are of omission. I spoke with Wendell over the phone today and he assured me they cannot be bi-amped. I understand that is not strictly true, I could physically undo everything and amp it how I please, but I understand his message.
Unfortunately he didn't seem to understand biamping is less about the speaker and more about the amplifier...
Not sure what I'm going to do. I'm sure the dealer won't want them back in the condition I have one in. I think I will install them in my frames sans bi-amping for the time being, and try and work through the schematic. At some fundamental level, there is a signal present to the tweeter/mid combo and it can be recreated prior to the amp instead of after the amp.
Perhaps in this case the solution for the amp doing mids and highs is to have it do midbass as well and lighten its load with a pair of powered subwoofers at 80-100hz or so. That way you get the well integrated drivers on one moderately stretched amp while taking out the heavy lifting required for low bass.
Your translation of the Magnestand schematic into ALLXO might be correct, but that doesn't mean it will work. :)
Clearly the midrange would not be producing any sound in your ALLXO example. (That should be obvious.)
Wendell obviously doesn't want to advertise the possibility these speakers could be bi/tri-amped, but of course they can. Any speaker with individual drivers can be successfully biamped.
Dave.
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