My first assessment was to find out what drivers were in the speaker and what was the filter like. The handicap was that the filter has been already tampered with in a previous attempt to fix it by replacing the burnt resistor.
In that process the wiring was not redone properly and the overall balance of the speaker was significantly altered.
Here is the list of the drivers employed:
Bass: 2 FOCAL 8C412T in an isobaric arrangement - PEL is using a patent from his father Joseph Leon
Medium: 1 SEAS P14
Tweeter: 1 SEAS H414
In another incarnation of this speaker, PEL used Focal drivers everywhere (PEL M IV):
Bass: 2 FOCAL 8C01
Medium: 1 FOCAL SN302
Tweeter: 1 FOCAL T120 - the famous kevlar inverted dome
This speaker was a subwoofer+satellite combo
Perry had been given links to a French forum where the following two conflicting schematics were posted:
A PE Leon dealer in Canada gave us a few photos of the OTHER filter...very confusing!
And obviously, the two designs did exist at some point in time...
One can assume that type 1 is the real deal and we started to work on that assumption.
I also trusted Perry when he confirmed (affirmed...) that all the drivers were OK. Being 15000 kms away, I had to trust him. From the photo of the rewired crossover, we could assess that we had all the components values right and from there I embarked on my own interpretation of what I thought the filter should be. And here is the result
This design is "textbook" with attenuators being in front of the filtering cell. This gives the ability to change the attenuation without changing the cutoff frequency of the following cell. I will leave you to ponder these schematics and in the next episode, I will explain how we went about remotely assessing the result. Let's just say that without our beloved iPads and the ingenuity of some Apps developer, we would still be trying!
Born in France, well travelled, relocated to Sydney in 1997.