Inside the EMG-89 pickup are both single and dual-coil pickups, each with its own output. The single-coil mode is an Alnico loaded stacked EMG-SA. The dual-coil mode consists of two Alnico loaded coils opposite one another, creating a pickup similar to the EMG-85. TheEMG-25K-PPP volume (or tone) pot allows you to change from the clarity of a single-coil to the fatness of a humbucking pickup. The EMG-89's separate outputs give you the option to utilize EMG tone enhancing accessory circuits on either pickup output.