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?
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?
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.
Crossover must be like this:
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.
I'd be more interested in checking the connections for oxidation.
This is the MA5, but similar, I would think.
Crossover must be like this:
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.
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.
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.
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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.
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.
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.
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.
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.
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.
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.
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.
Well thanks for getting back on that.
I've tried acoustic butterworth type filters myself, and didn't find they sounded special.
Regular third order works well enough IMO.
Yes I suppose it shows how bad some of the 70's KEF crossovers were, these monitor audio crossovers are okay, although the one I've changed had issues with connection to the binding posts so I'm going to take my time and do a better job of cleaning it up before I refit it.
My old lecturer on filters at college explained that crossovers only make a lot of difference in the octave around crossover. The rest of the skill is getting the tonal balance right.
Troels Gravesen works toward a restrained tonal balance. Not overly bright at the top.
SEAS-3-Way-Classic
I only mention this because those MA4 speakers would make a goodish three-way with a fairly substantial hobby effort.
My nephew has a pair of Celestion Ditton 22. Superb vintage speakers:
You'd need to add a midrange enclosure:
Complete Ditton 22 rebuild
3-ways are just so much better! All about the voice clarity. 😎
Troels Gravesen works toward a restrained tonal balance. Not overly bright at the top.
SEAS-3-Way-Classic
I only mention this because those MA4 speakers would make a goodish three-way with a fairly substantial hobby effort.
My nephew has a pair of Celestion Ditton 22. Superb vintage speakers:
You'd need to add a midrange enclosure:
Complete Ditton 22 rebuild
3-ways are just so much better! All about the voice clarity. 😎
Yes I agree with that they would make a good 3 way I thought about that myself although I wouldn't want to make a mess if the cabs.