Rob - I have done considerable work comparing and choosing caps and resistors, both with Beetle and consulting with folks at Thiel. I chose Mills MRA-12 resistors and ClarityCap CSA feed capacitors plus some CC customs for shunts. It is likely that large shunt caps will actually be electrolytics, which I have not chosen. I have not yet done the iterations re which caps matter enough for which price points, etc. But I have chosen candidate caps for each spot. Rob will only have the CC SAs which were CC's best at the time, for the series feeds. My legal status is not finalized for Thiel bankruptcy, so I can't now share schematics, etc. I consider Thiel coils world-class. Do not increase wire size in coils, since their resistance IS critical to the circuit performance. We learned that later CS2.4 XOs were made in China with inferior wire. Rob G might know the serial # watershed and might have Thiel coils. If so, I recommend upgrading at least the series feed coil in the midrange circuit. I am using custom coils from ERSE or Jensen as world-class equals.
Regarding wire, as I've mentioned, that stock wire is world-class and carefully chosen. There is a widespread belief that sexier wire is better, and I concur in general. However, remember that increasing size will reduce resistance and that the wire resistance is part of the overall circuit design. Eventually I will measure the differences and compensate. For now, I suggest experimenting with different type (such as litz) at the same gauge, especially the long runs between XO and drivers. There is a spot which I perceive advantage without much alteration. Between the input terminals and the XO carries both direct and shunt signal and therefore acts as a choke point, both + and -. I like it thicker, but haven't measured it until I get to work on the XO as a whole.
There is room for improvement via better input terminals. I suggest tight mechanical connections before soldering. BTW, bare copper or silver on copper rocks. Gold isn't that great and brass is poor. CAIG Labs makes a conductive paste with cleaner-antioxidant in it. Keeps non-gold connections clean and conductive.
Keep us posted.
Regarding wire, as I've mentioned, that stock wire is world-class and carefully chosen. There is a widespread belief that sexier wire is better, and I concur in general. However, remember that increasing size will reduce resistance and that the wire resistance is part of the overall circuit design. Eventually I will measure the differences and compensate. For now, I suggest experimenting with different type (such as litz) at the same gauge, especially the long runs between XO and drivers. There is a spot which I perceive advantage without much alteration. Between the input terminals and the XO carries both direct and shunt signal and therefore acts as a choke point, both + and -. I like it thicker, but haven't measured it until I get to work on the XO as a whole.
There is room for improvement via better input terminals. I suggest tight mechanical connections before soldering. BTW, bare copper or silver on copper rocks. Gold isn't that great and brass is poor. CAIG Labs makes a conductive paste with cleaner-antioxidant in it. Keeps non-gold connections clean and conductive.
Keep us posted.