Thiel cs2.4 upgrade to cs 2.4 se

@desmond888
Are you asking about capacitance or resistance? The DC resistance on my FST coax board (with Mills resistors) was 30.5 ohms, 0.4 ohm on the woofer board. My new boards matched those values within 0.1 ohm. On my copy of the 2.4 layout, someone hand wrote 32 ohms for the coax, <1 ohm for the woofer. But that layout is for point to point on masonite. Tom Thiel discovered the values were later adjusted for the PCB environment. Holco’s copy indicates 31 ohms for the coax. Ideally, you would have measured that before you started your upgrade.

This is measured simply by connecting your ohm meter from the + in to the + out.

beetlemania,

My two boards measure with only the Jantzen caps upgrade 30.5 ohm
after the upgrade with all other parts on the bigger PCB's I measure 30.1 ohm on the first ready one, could this be a tolerance effect between the resistors? Do I have to worry?

The second board measure also 30.1 ohm, so atleast they are exactly  the same, think that it is the Jantzen Cross coil, 0.12 ohm vs the 0.3 ohm on the original air-coil.

Probably a question for Tom Thiel . . . I do know for individual components +/- 3-5% is acceptable, but maybe the tolerance is tighter for the global circuit? As a check, l compared the frequency response of a tone glide with and without the upgrade (well, OEM boards with resistors replaced). All good in my case. If the balance sounds right, you’re probably good. If you’re paranoid, ask Tom on the other thread. He *might* recommend modifying a resistor value.

Finished the second loudspeaker and there seems nothing wrong, except my jaw is on the floor, what a great great great sound!!!