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Bare Knuckle Polymath vs Seymour Duncan JB Model (SH-4)

high confidence

Compared with the Bare Knuckle Polymath, the Seymour Duncan JB Model (SH-4) has a brighter top end.

Specs side by side

differs marks specs where they part ways
SpecBare Knuckle PolymathSeymour Duncan JB Model (SH-4)
DC resistancediffers14.2k16.4k
Inductancediffers8.35 H (measured, 1 reading)8.54 H (measured, 3 readings)
MagnetAlnico 5Alnico 5
CoilHum-cancellingHum-cancelling
Resonant peakdiffers5.5 kHz (Seymour Duncan's own test load)
Bass (tone chart)Each maker grades its own chart, so read these within a brand5 / 105 / 10
Mids (tone chart)differsEach maker grades its own chart, so read these within a brand7 / 106 / 10
Treble (tone chart)differsEach maker grades its own chart, so read these within a brand6 / 108 / 10
Slotbridge humbuckerbridge humbucker
Traitshigh output, dark, mid-forwardhigh output

How close on each spec

100 means identical on that spec. The score weighs these, and counts anything we couldn't compare as a typical difference. How scoring works

Output
97
measured inductance
Magnet
100
both Alnico 5
Coil
100
same coil type
Brightness
32
each against its maker's average
Mids
86
each against its maker's average
Bass
94
each against its maker's average

Videos

Bare Knuckle Polymath

Seymour Duncan JB Model (SH-4)

Seymour Duncan JB SH-4/TB-4 Bridge Humbucker Pickup Demo Clean, Dirty and Lead Tones (NO TALKING)
John-Ace Llera
DiMarzio SUPER DISTORTION vs Seymour Duncan JB SH-4 - Passive Bridge Guitar Pickup Comparison Demo
Mike Stamper · comparison

What players and reviewers say

On the Bare Knuckle Polymath

The bridge humbucker delivers tight low end control with zero flub under palm mute.
Darth Phineas · Feb 25, 2026Darth Phineas (opens in a new tab)
There is enough upper mid articulation to cut through a dense mix, but the voicing avoids harsh spike territory.
Darth Phineas · Feb 25, 2026Darth Phineas (opens in a new tab)
Everything on the Bare Knuckle Polymath

On the Seymour Duncan JB Model (SH-4)

The Full Shred is a tad lower in output and gets close to the lead sound of a JB.
El SupremoSeymour Duncan forum (opens in a new tab)
JB is very touchy. It likes the heights about the same on the high and low side.
glip22 · Apr 8, 2016Rig-Talk (opens in a new tab)
Everything on the Seymour Duncan JB Model (SH-4)

Full reviews