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RE: MG IIa Crossover replacement

Replacing the speaker level crossover will probably require an external box as the upgrade components are not likely to fit. The IIa uses 3rd order filters so the cost of upgrade will not be insignificant (6 inductors and 6 caps for the two speakers).
A passive line-level xo has several advantages (no inductors, smaller caps, lower cost and all the advantages of biamping) but also has significnt disadvantages. The design must be match to your amplifiers - you will need two - and preamp. If you change electronics you will need to change the xo as well. The biggest obstacle though is the impossibility of making 3rd order line-level filters that will simulate the original speaker level xo. The solution is to change to first order filters like the IIb and IIc.
The best approach, again IMO, is to go to an active crossover. The cheapest way to do this is with a DIY, but you may want to start off with a Behringer DCX-2496. These can be found used but even new is probably cheaper than upgrading the speaker level crossover.



"Our head is round in order to allow our thoughts to change direction." Francis Picabia



Edits: 11/03/14 11/03/14

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