The circuit for the EAS active subwoofer equaliser is as shown in the project article. It is very simple to construct, and you may use either an off-board dual-gang pot, or on-board single gang pots (9mm miniature post will fit on the board). Using two separate pots does not affect the performance in any way. All components except the phase reverse switch and final gain control (optional) may be mounted on the PCB.

Like most ESP projects, a power supply is required. This PCB can be powered from your preamp supply (typically the P05), or any source of ±12V to ±15V. Alternatively, any source of clean DC within the stated limits may be used.

Order Code	P48
Size (mm)	64 x 37