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Multi-Way Conventional loudspeakers with crossovers

Monitor audio ma4 series 1 crossover
Monitor audio ma4 series 1 crossover
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Old 3rd July 2020, 11:06 AM   #1
Mattyw1987 is offline Mattyw1987  United Kingdom
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Default Monitor audio ma4 series 1 crossover

I've recently picked up a very clean pair of these speakers and I'm liking them so far and was planning on recapping the crossovers but with a bit of digging online I found they used the same crossovers across a fair bit of their range.

The thing is tho they used the same crossovers for the b200 sp1039 which mine use and also the sp1014 which is a different driver in most ways but they must of thought it worked, well I've got a set of falcon acoustics 37k crossovers designed for the b200 sp1014 and t27 that look better than the ma crossovers, does anyone think it would be worth while giving them a try?
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Old 3rd July 2020, 11:58 AM   #2
system7 is offline system7  United Kingdom
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Sounds like fun. But really those crossovers shouldn't need recapping, being film types.

I'd be more interested in checking the connections for oxidation.

This is the MA5, but similar, I would think.

Click the image to open in full size.

Crossover must be like this:

Click the image to open in full size.

Help please. Rebuilding Monito Audio MA5 crossovers as 1st DIY project

Probably a few extra resistors to quieten the louder 1" Isophon plastic tweeter.

You really need to compare the schematics. But in principle, I don't see why the spare Falcon crossover shouldn't work. Certainly nothing will blow up.
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Old 3rd July 2020, 12:05 PM   #3
Mattyw1987 is offline Mattyw1987  United Kingdom
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Thanks and yes they share the same crossovers with the ma5 although use a different driver, speaking of the crossover corrosion I got them for £80 because one speaker wasn't working although it had no voice coil rub and was visibly like new, well I thought it would be a bad connection and as you say corrosion between binding posts and crossover.

I think I will try a falcon crossover in one and then a/b them in mono as I know these are a vast improvement over some kefs I've swapped them in, also the wiring needs to be redone anyway the wire they used in the 70's to the bass drivers just never does it for me lol.

Last edited by Mattyw1987; 3rd July 2020 at 12:08 PM.
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Old 3rd July 2020, 12:09 PM   #4
system7 is offline system7  United Kingdom
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I don't think wiring makes that much difference, but should be twisted to reduce inductance.

I've just found the Falcon crossover.

KEF CHORALE IMPROVED CROSSOVER No. 37K c/w aB HF SECTION

That one is a bit driver specific for the KEF T27 tweeter. It has a snubbing or acoustic butterworth AB network to tame the Fs of the tweeter. And so is tuned to about 1500Hz.
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Old 3rd July 2020, 12:10 PM   #5
Mattyw1987 is offline Mattyw1987  United Kingdom
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Ahh yes so may not work well with the kk8, I can't find specs of the kk8 to compare it with the t27 which is a shame.
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Old 3rd July 2020, 12:28 PM   #6
system7 is offline system7  United Kingdom
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You might be in luck. The Isophon KK10 was 1100Hz Fs, like the T27.

Not sure how that compares to the KK8. But similar tweeters, IIRC.

Just might need a couple of ohms resistance in front of the filter to pad it down 2dB.
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Old 3rd July 2020, 12:30 PM   #7
Mattyw1987 is offline Mattyw1987  United Kingdom
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Nice that's good to know, well the sp1039 is slightly more sensitive than the sp1014 so hopefully they will match well with padding down, thanks for the help.
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Old 3rd July 2020, 12:38 PM   #8
system7 is offline system7  United Kingdom
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Yes. Have a bash!

I always liked those Isophon tweeters.
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Old 3rd July 2020, 12:40 PM   #9
Mattyw1987 is offline Mattyw1987  United Kingdom
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Yes I mean these sound good as they stand but I've found these falcon crossovers have always sounded better than the kefs I've replaced with them and with the ma4 using a generic crossover I think there must be room for improvement.
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Old 4th July 2020, 08:48 PM   #10
Mattyw1987 is offline Mattyw1987  United Kingdom
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Well I fitted the falcon crossover to one speaker and then a/b them and the difference was to my ears nearly nothing so monitor audio did something right with these as everytime I've swapped some vintage KEF crossovers out the difference has been substantial.
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