DIY Cheap crossover parts effect on frequency response

If anyone on these forums can help, I'd appreciate it.

I'm building my first set of speakers. I have done months of research on drivers, designing crossovers, cabinet considerations, so let's please leave that aside.

I thought I would be clever and buy much cheaper parts than what I was planning on buying with equivalent specs to confirm the theoretical changes I was seeing in VituxCAD. I made three measurements using REW and my UMIK-1:

1) No crossover

2) Proposed first order crossover

3) First order crossover with a 1.5Ohm resistor in the woofer circuit intended to bring down a 100Hz peak.

The resulting sweeps are telling me that the crossover I designed does not have an effect below 1k Hz.

(Trying to eliminate other variables) The room is poorly treated, the results are still consistent within the room. I am confident that my wiring/soldering skills have not derailed this circuit. Am I missing anything else?

Is it really just the cheapness of the parts? If I'm going to spend hundreds of dollars on parts, I want to have some amount of confidence in their effectiveness. The cheaper attempt already cost $75, and getting entry-level audio components before buying what I wanted in the first place makes me uneasy.

Thanks