Thiel cs2.4 upgrade to cs 2.4 se

@holco curious why you’re putting a foil coil on the woofer board and not replacing the one in the coax feed (0.15 uF). 

One caution for the DIY crowd from Tom Thiel is to pay attention to the DC resistance on the boards as new parts can change these values and upset the balance. In my case, the new parts matched original values within 0.1 ohm. As Tom’s beta tester, I have full value capacitance in single caps. Only my bypass caps (~1% Multicap RTX) are in parallel, but those did not add measurable resistance.

Good question beetlemania, will look into it. 

On my boards, that  coax feed coil is an ERSE FoilQ. It is availble in 16 gauge at 0.15 mH. The OEM aircore one is 18 ga but I cannot tell it hurt anything to increase the gauge and was OKed by Tom Thiel. Then again, I’ve changed so many parts at once that it is near impossible to say where the biggest improvements came from. Well, I did change the resistors to Mills as a first step, so I know what those add to SQ. I will soon compare the Clarity CSAs with and without bypasses on the coax feed. 

beetlemania,
Because I can't get those small values in a Jantzen wax coil I decided to leave it in, not a big deal I think, the resistors and the caps play a lot bigger part on SQ

@holco fair enough. Unless you have an FST-sourced XO like me (and your pics indicate you have a Lexington XO), the OEM coils are already excellent. I agree your boards will most benefit from better caps and resistors.