This curve tells you more about how a pickup will sound than any single measurement will. The resonant peak’s height, width (also known as Q-factor), and horizontal position create this whistle and define the character of the pickup. By having a consistent capacitance and inductance, you can consistently create the same resonance curve each time. This is what PRS is trying to do – create a great-sounding pickup, consistently. But how did PRS decide what capacitance and inductance they should use?
A little-known fact about Paul Reed Smith is that PRS Guitars is not his only company. Paul also started a separate company called Digital Harmonic, which creates some really crazy technology used by the military and security organizations. While the technology is very interesting, I bring it up because it is related to TCI. A previous PRS employee and great member of the PRS Forum Shawn@PRS stated in response to a question about TCI:
“Are you familiar with the technology Paul created? He spun off a second company called Digital Harmonic. With this technology, a photo taken in pitch dark has details, depth of field and it remains a color photo. He uses this same technology to measure the character of a pickup. Most of us are familiar with the “DC resistance + magnet type = the tone of a pickup” equation. Paul believes that is just the tip of the iceberg.”
It appears that PRS may have a proprietary way to deeply measure how a pickup sounds and responds. However, this information is in slight conflict with information available in the May 2019 issue of Guitarist Magazine. In their article titled, “What is TCI?”, they share an image of a fairly standard oscilloscope displaying a pickup resonance curve. On the image, the text reads, “this signal analyser allows PRS to ‘see’ how its pickups will sound.” This is the exact same technology we are using to create our resonance curve charts, like the one above showing the TCI “S” and 635JM “S” pickups.
Whether they are using proprietary tech or not, we can be sure that they have taken measurements of the best-sounding pickup examples they could find and tried to match these readings for the new pickups they produce. Ultimately, that is what the TCI-process is. Find a great-sounding pickup, take deep measurements of it, and recreate it consistently by making sure the capacitance and inductance are consistent.
As an aside, this is not dissimilar in concept to what Fishman Fluence pickups are doing. Fishman is accomplishing this by creating a consistent base pickup with stacked circuit boards and managing the sound using an onboard DSP. The DSP is creating the curve. This is how they can have multiple voices, it’s simply (through complicated technology) switching the resonance curve. The technologies are very different, but the goals are the same.
You may be wondering, “why can’t you just do this with the wire turn count?” It is true that most pickups are designed that way. Even PRS has a leaked pickup sheet that shows each pickup along with the turn count used in the past. Using a consistent turn count is a great way to accomplish a relatively consistent pickup without this technology. But wire is not always consistent, coatings aren’t always consistent, and 5,000 turns with inconsistencies can lead to noticeable changes. This is why pickups aren’t always consistent. This doesn’t make them bad, just unique.
3 thoughts on “PRS TCI Pickups Explained”
Well laid out and informative. Much to ponder as companies like PRS innovate and take their pickups into the future. Thanks for this well written and researched article!
My guitar teacher used to say, forget about all the hardware, it’s all about playing.
Just an FYI… The statement above with regard to, “Paul’s Guitar (2019 models and beyond)”, is not totally correct. I have an Experience PRS 2018 Limited Paul’s Guitar, it has the first release of the TCI pickups!