4-string · Neck-Through-Body with Graphite Reinforcement
Unique Jackson® 2x2 headstock, offset Spectra Bass body style with larger upper horn for balance and comfort, 3-band active EQ, two-way toggle switch to bypass or engage active circuit, additional three-way toggle switch for variable mid-frequency, Nordstrand® SB4 single-coil soapbar bridge and neck pickups, alnico V magnets
| Construction | Neck-Through-Body with Graphite Reinforcement |
| Strings | 4 |
| Body | Multi-Laminate: Poplar Burl/Walnut/Maple/Walnut/Mahogany |
| Neck | 5-Piece Maple/Walnut/Maple/Walnut/Maple |
| Fingerboard | Caramelized Jatoba |
| Neck Pickup | Nordstrand® SB4-N |
| Bridge Pickup | Nordstrand® SB4-B |
| Controls | Volume, Blend, 3-Band EQ (Active Only) |
| Bridge | Jackson® Single-String |
Artists documented playing the Jackson Pro Series Spectra Bass SBP IV: Evan Seinfeld, Rick Savage.