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Old 18th February 2015, 07:33 PM   #1
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Default 2 Way Crossover Modification query

Hi,
I am looking at making a 3 way floor standing speaker using the following drivers:
Audax HD100D25
Audax HD17b25j
Dalesford D200
8" passive radiator
I have a pair of 2way crossovers from a set of Audiomaster MLS 5's which use the 2 Audax drivers above, but with a second Audax HD17b25j as a passive radiator - is it going to be possible to modify the crossover to only allow midrange through the HD17b25j and make a second crossover for the Dalesford D200 - I am planning on bi-amping.
Or do I need to start from scratch?
I already have all these drivers, so different ones are not really an option. I had considered getting a set of Kef 104's, but they are going for silly prices these days and I would like to use what I have.
Attached is a pic of the crossover - I know it needs re-capping, but want to know if this is the way to go.
Any advice gratefully received
Thanks,
Colin
Attached Images
File Type: jpg F6 1 Crossover for web.jpg (288.9 KB, 78 views)
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Old 18th February 2015, 08:25 PM   #2
sreten is offline sreten  United Kingdom
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Location: Brighton UK
Hi,

A fine set of old drivers .....

That is one hellishly complicated x/o for a 2 way.
7 inductors, 9 capacitors and 5 resistors.

You sure about the the MLS5's ?
IMO it is nowhere near, it is way too
complicated for an Audiomaster 2 way.

Trace out the x/o and post it here.

Biamping will give you a lot more options,
including line level passive bass to mid x/o.

rgds, sreten.

FWIW noting the unusual SP 2012 marking on
the central capacitor, a KEF SP2012 x/o exists,
for B300 bass unit (SP1071), B110 midrange unit
(SP1057), T52 tweeter (SP1072) for the 105.2.
But it is certainly not a KEF SP2012 105.2 x/o.

Falconacoustics may be able to help identify it.
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When your only tool is a hammer, every problem looks like a nail - Abraham Maslow

Last edited by sreten; 18th February 2015 at 08:52 PM.
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Old 18th February 2015, 08:54 PM   #3
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Hi Sreten,
I will try and trace the cross over tomorrow.
They are definitely MLS 5 crossovers - I have a set, please see attached pic.
I bought a second pair of crossovers off Ebay and can confirm that they are definitely the same crossovers.
I'm not sure and can only guess that Robin Marshall was trying to mimic the ls3/5a sound - they are very similar, but with bass.

Thanks,
Colin
Attached Images
File Type: jpg IMG_0340.jpg (543.9 KB, 73 views)

Last edited by Impman71; 18th February 2015 at 09:10 PM.
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Old 18th February 2015, 09:12 PM   #4
sreten is offline sreten  United Kingdom
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Location: Brighton UK
Hi,

Fair enough, its best usually to doubt.

Are you sure one of the MLS5 drivers is a PR ?
They look very 2.5 way to me, which would explain
some of the x/o's extra complexity over 2 way.

rgds, srten.
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When your only tool is a hammer, every problem looks like a nail - Abraham Maslow
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Old 19th February 2015, 08:38 PM   #5
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Hi,
This is an interesting question!
When I first got these all three drivers were wired up (the mid/woofers were wired in parallel). They lacked mid range and did not sound right. I bought a set of Ram mini monitors that use the same drivers, but their mid range sounded much better, so I had a play around and tried running the MLS5's as a 2 way instead and their mid range came to life and the bass was still there, so I assumed someone had played with them before?
I cannot find any info about them on the web, unlike most of the other Audiomaster range, they are quite rare.
Pics attached of marked up cross overs - hopefully this is what you meant?

Thanks,
Colin
Attached Images
File Type: jpg F6 1 Crossover for web rear.jpg (151.8 KB, 49 views)
File Type: jpg F6 1 Crossover for web labelled.jpg (432.1 KB, 48 views)
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Old 19th February 2015, 09:21 PM   #6
sreten is offline sreten  United Kingdom
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Hi,

I meant tracing out the schematic, to work out what it does.

rgds, sreten.
__________________
There is nothing more practical than a really good theory - Ludwig Boltzmann
When your only tool is a hammer, every problem looks like a nail - Abraham Maslow
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Old 20th February 2015, 07:07 AM   #7
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Thanks Sreten,
I thought what I had done was too easy!
I will attempt to trace it over the weekend - I'm struggling to follow it, but will do my best!
Am I right in saying that if it was a 2.5 way that there would be 8 terminals on it? They really didn't sound right when they were wired in parallel.
Thanks,
Colin
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Old 20th February 2015, 05:11 PM   #8
sreten is offline sreten  United Kingdom
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Hi,

8, or perhaps 5 with a common, usually negative.

rgds, sreten.
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When your only tool is a hammer, every problem looks like a nail - Abraham Maslow
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Old 20th February 2015, 05:52 PM   #9
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Hi,
There are 6 & 3 are directly linked on the board.
So I think I'm right in saying it's not a 2.5 way as there is not a third positive terminal.
Hoping to trace it on Sunday - think there will be a lot of head scratching involed
Thanks
Colin
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File Type: jpg image.jpg (839.6 KB, 23 views)
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