Audax HD-3P Gold Dome replacement - Page 2 Crossover

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Audax HD-3P Gold Dome replacement
Page 2 Crossover
Page 3 New Strategy
Page 4 Final Listening
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As always I went through a few iterations of the crossover before finalising it. This is often the way as the first attempt never works out as you would expect when you start listening to it.

In this case, the first measurements seemed to indicate that a significant change to both the midrange and the treble sections of the crossover would be necessary. That’s because, at first sight, the slope of the upper midrange crossover did not look right for the new tweeter. So it seemed easier to adjust both in order to make sure of good integration between the two.




KLS3 Gold Mk2 Crossover – the original on which the Mk3 is based.



Originally KLS3 Gold had inverted phase between all three drive units. In theoretical terms a second order crossover always will be easier to integrate when the drive units are electrically out of phase. If you’ve followed my articles on speaker development in the past, however, you’ll have seen that what works in theory doesn’t always work in practice when it comes to working with real-life drive units.


In trying to keep the same integration between the drivers as was evident on the originals I left the electrical phase as it was, in other words the treble and bass units were inverted in phase compared to the midrange. This gave me a good frequency response, once I’d used LspCAD6 to help me adjust the crossover values, but that didn’t translate into a smooth listening experience.


Plugging the new treble unit and crossover into the speakers and lugging them into the listening room I sat down to experience what I hoped was as smooth a response as I had measured. No such luck!


What I hate most about three way crossovers is that when you do anything at all to one of the crossover sections you disturb the other crossover too (audibly, that is). So it was absolutely typical that, having altered the upper midrange crossover, the integration between the midrange and bass units fell apart.

Clearly this needed a rethink – a new strategy was called for.

Comments (1)
Speaker Upgrading
1Tuesday, 31 July 2012 08:36
Greg Ferrari
A very good article with the detail I prefer. The principles of how to improve the old speakers with well known drives units to meet the current quality of the best digital sound is now a necessity to anyone wanting to retain old speakers and get fantastic sound

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