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In Reply to: RE: No sound from Magnepan MG III-B bass panel posted by Alan0514 on May 13, 2015 at 00:46:21
Check continuity and resistance of the bass wires at the bass panel binding posts/terminals if you don't have about 4 ohms or no continuity then you are facing a likely broken wire on the panel and will have to replace the wiring. You can do it on your own with a kit from magnepan or send it to magnepan for a professional repair.If the problem is not there, then check the crossover box for the bass section continuity on + in to + bass out and the same on the negative leg. Note that the mid/tweeter panels' crossover section has a capacitor in it and will not produce a continuity beep since a capacitor is a disconnect in DC.
It is unlikely that you will be able to drive the speakers to satisfying volumes with your receiver alone.
Consider getting a high current power amp to drive the whole speaker or to drive the bass section in a biamp setup (which can be done with the original passive crossover).
Edits: 05/13/15Follow Ups:
Being a total newbie and knuckle head, I mislabeled the speaker as MG III instead of the correct model, which is MG II-B.
I apology for the confusion.
Satie, is your instruction appliable to tje MG II-B?
Thanks,
Alan
Well, the MG IIB are old and you should be prepared to do a complete rewiring, http://www.integracoustics.com/MUG/MUG/tweaks/tony2v/mg2b_repair.htm
You can a repair set from Magnepan.
I think you can keep your receiver. I have not had any problem running any of my three sets of Magnepan with a receiver.
Thank you Satie.
I can return the speaker to the previous owner or keep them. I paid $100 for the pair and probably will keep and fix the panel. From your excellent description, it doesn't sound too difficult.
I'm aware of the receiver's shortcomings. I haven't had the chance to own a pair of larger Maggie until now and will begin to get the right hardware for them.
Lastly, although I understand the basic electronic principle and know my way around electrical current and resistance, is there a document or webpage describing the basic troubleshooting steps?
Again, your help is much appreciated.
Regards,
Alan
The crossover of the MGII models is internal IIRC. but you can get the bass panels' impedance (along with that of the coil) by measuring across the terminals. But I don't know the correct figure for sure, I would guess 4-6 ohms.
Since you essentially got the speaker for free, I would not hesitate to send the speaker to be repaired at magnepan if the problem is indeed a disconnect in the wires. If you can't afford to do that then order the repair kit with foil conductors instead of wire for both panels and that will update them to modern QR (quasi ribbon) performance. Later you can get the tweeter wires redone. But this is not that easy a project. Very time consuming and lots of pain staking work. .
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