Finally finished and I'm a little surprised at the results but there's a caveat, see below. I made two videos to make sure my ears weren't crazy. You'll have to excuse the garbage playing.
The first compares the HSS pickguard to the SSS pickguard. Here's what I did to eliminate variables:
- pickups set to the exact same height
- same guitar just with different loaded pickguards
- PCBs on both pickguards show model MC907W
- fresh set of the same strings before each take, D'Addario XL 9-46
- strings were stretched with 5 passes using a String Stretcha (such a dumb name for a cool tool)
- same cable
- same interface
- same gain staging
- only tested positions 3, 4, and 5
- comped to a single track
There are two things I didn't realize until after I was done. First, I normally use NYXL strings which are naturally brighter but I only had matching sets of the regular XL's to make the recording. It's still a 1:1 comparison just not my typical setup.
Second, I forgot I lifted the stock parallel resistor on the HSS pickguard. I don't remember hearing much of a difference before but, in theory, that should increase the overall brightness.
It definitely wasn't what I was expecting so I pulled out my daughter's Cutlass and did another pass. Both guitars are RS models with maple fretboards. Hers was significantly brighter and airier while mine had a fuller girthier tone. Now I'm going to have to swap the SSS pickguards
Only letting include 1 video so here's the link to the other:
Green SSS vs Blue SSS - YouTube
In Conclusion:
This was not what I expected. On the same, guitar it was actually pretty close. There were a few minor differences but overall very consistent. The big shocker was how different the SSS models were from each other. I think this could also explain how Mike's test was so different, too many variables between different guitars.
It was fun putting it together so I may try this again with a few more options. Swap pickguards between the two, reconnect the resistor, go back to NYXL's, etc. Let me know if there are any combinations you want me to try.